Relevant bibliographies by topics / Cassiar Mountains British Columbia

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Academic literature on the topic 'Cassiar Mountains British Columbia'

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Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Cassiar Mountains British Columbia"

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Grice, J. D., and R. A. Gault. "Jade, Gold, and TOPAZ:From the Cassiar Mountains, British Columbia/Yukon Territory, Canada." Rocks & Minerals 60, no. 1 (January 1985): 9–13. http://dx.doi.org/10.1080/00357529.1985.11764360.

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Butler, R. F., T. A. Harms, and H. Gabrielse. "Cretaceous remagnetization in the Sylvester Allochthon: limits to post-105 Ma northward displacement of north-central British Columbia." Canadian Journal of Earth Sciences 25, no. 8 (August 1, 1988): 1316–22. http://dx.doi.org/10.1139/e88-126.

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The Sylvester Allochthon of the Slide Mountain Terrane in northern British Columbia is a structurally interleaved assemblage of ocean-floor lithologies ranging in age from Late Devonian to Late Triassic. It is the most inboard of oceanic suspect terranes and rests as a vast klippe on miogeoclinal strata of the Cassiar Terrane. The Sylvester Allochton and the Cassiar Terrane lie west of the Northern Rocky Mountain Trench Fault. Both the Sylvester Allochthon and the Cassiar Terrane are intruded by mid-Cretaceous (105 Ma) granite of the Cassiar Batholith. Six oriented cores were collected at each of 12 sites in Guadalupian Parafusulina-bearing limestone of the Sylvester Allochthon at a location 4 km from the batholith. Isothermal remanent magnetization (IRM) acquisition and subsequent thermal demagnetization indicate that pyrrhotite is the dominant ferrimagnetic mineral. Least-squares line fitting to four thermal demagnetization steps between 150 and 310 °C was used to determine the characteristic natural remanent magnetization (NRM) directions that fail the fold test at the 99.5% confidence level. We interpret these observations as indicating that the NRM is a thermoremanent or thermochemical remanent magnetism associated with intrusion of the Cassiar Batholith. The resulting paleomagnetic pole location is latitude = 75.7°N, longitude = 171.7°E, α95 = 8.5°. When compared with the mid-Cretaceous pole for cratonic North America, a small but significant clockwise rotation (R ± ΔR = 23.9 ± 18.1 °) is evident, but poleward translation (p ± Δp = 5.3 ± 9.2°) is not significant at the 95% confidence level. The paleomagnetic results are consistent with geological evidence for moderate (700 km) northward transport of the Cassiar Terrane (along with the previously emplaced overlying Sylvester Allochthon) during mid-Cretaceous to Tertiary dextral transcurrent faulting.
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Pyle, Leanne J., and Christopher R. Barnes. "Conodonts from the Kechika Formation and Road River Group (Lower to Upper Ordovician) of the Cassiar Terrane, northern British Columbia." Canadian Journal of Earth Sciences 38, no. 10 (October 1, 2001): 1387–401. http://dx.doi.org/10.1139/e01-033.

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This study examines the lower Paleozoic stratigraphy of the Cassiar Terrane from three key sections comprising an east-west transect across the terrane. The Cassiar Terrane, west of the Northern Rocky Mountain Trench, consists of a Neoproterozoic to Triassic succession and is a fragment of the Cordilleran Miogeocline that has been displaced northward. The amount of displacement from its original position remains controversial. Conodonts from the Cassiar Terrane have been previously reported from only a few reconnaissance studies. More than 3000 m of strata have been measured and examined in detail and 85 conodont samples collected. A total of 926 identifiable conodont elements are assigned to 31 species representing 21 genera. The conodonts are mainly representative of the Midcontinent Faunal Realm, but some also represent the Atlantic Realm. Conodonts from the upper Kechika Formation and base of the Road River Group are Early Ordovician (Tremadocian) in age, and those from the upper Road River Group range into the Upper Ordovician (Caradocian). The detailed Ordovician stratigraphy and temporal constraints established by conodont biostratigraphy provide for correlation to coeval facies of ancestral North America. The onset of Road River sedimentation in the mid-Tremadocian is, however, older than that in the Macdonald Platform to the east (early Arenigian). This onset timing may help link the Cassiar Terrane to a specific part of the miogeocline from which it was transported.
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Nelson, JoAnne, and Richard Friedman. "Superimposed Quesnel (late Paleozoic–Jurassic) and Yukon–Tanana (Devonian–Mississippian) arc assemblages, Cassiar Mountains, northern British Columbia: field, U–Pb, and igneous petrochemical evidence." Canadian Journal of Earth Sciences 41, no. 10 (October 1, 2004): 1201–35. http://dx.doi.org/10.1139/e04-028.

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Allochthons in the Cassiar Mountains of northern British Columbia contain assemblages belonging to two distinct Canadian Cordilleran terranes, Yukon–Tanana (YTT) and Quesnellia. These assemblages, of pre-Late Devonian, Devonian–Mississippian, Pennsylvanian–Permian, and Early Jurassic age, occur in intrusive and depositional, as well as structural, contact with each other. The allochthons are gently dipping thrust panels, interrupted by the mid-Cretaceous Cassiar Batholith. A key element for correlation across the batholith is the Mississippian and older pericratonic Dorsey Complex. New Devonian–Mississippian U–Pb ages for deformed plutons within it document an igneous suite like those in type Yukon–Tanana exposures farther north. Other characteristics of the Dorsey Complex that ally it with YTT are orthoquartzites and grits, and amphibolite bodies with transitional mid-ocean ridge basalt (MORB) to ocean-island basalt (OIB) petrochemical signatures. Unconformities, deformed clasts in the late Paleozoic sequences, and a shared mid-Permian intrusive suite show that later arcs onlapped the mid-Paleozoic and older YTT assemblage. The Early Jurassic intrusive suite cuts all major contacts and fabrics except the terrane-bounding fault between the Slide Mountain and combined YTT–Quesnel terranes. It represents a northern continuation of a plutonic belt that extends the length of the Mesozoic Quesnel magmatic arc. These relationships carry important implications for Cordilleran terrane history and the tectonic evolution of the North American margin. At least some of the major terranes were not unrelated entities prior to their accretion to the continent, but a system of superimposed and interconnected arcs that developed over a protracted time interval, with complex and evolving paleogeographic configurations much like the modern western Pacific province.
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Nelson, JoAnne L. "The Sylvester Allochthon: upper Paleozoic marginal-basin and island-arc terranes in northern British Columbia." Canadian Journal of Earth Sciences 30, no. 3 (March 1, 1993): 631–43. http://dx.doi.org/10.1139/e93-048.

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The Sylvester Allochthon is a composite klippe of upper Paleozoic ophiolitic, island-arc, and pericratonic assemblages, which rests directly on the Cassiar terrane, a displaced sliver of Ancestral North America. Each tectonic assemblage occurs at a distinct and consistent structural level within the allochthon. They are assigned, respectively, to the Slide Mountain, Harper Ranch, and Yukon–Tanana terranes. The Sylvester Allochthon provides a view of the structural relationships between these terranes prior to Early Cretaceous – early Tertiary strike-slip dismemberment, as well as possible sedimentological links to late Paleozoic North America. Slide Mountain Terrane assemblages, designated divisions I and II, form the lowest structural panels. Chert – quartz sandstones are interbedded with Lower Mississippian deep-water sediments in division I and ocean-floor basalts and deep-water sediments in division II. They are similar in age and character to sandstones in the autochthonous Earn Group. Division II assemblages represent atypical oceanic crust and upper mantle assemblages. Continuous basalt–sedimentary sequences, well dated by conodont faunas, span Early Mississippian to mid-Permian time. Feeders for the basalts are sills rather than sheeted dyke swarms, suggesting very slow spreading and high(?) sedimentation rates in a marginal-basin setting. These supracrustal sequences are thrust-imbricated with ultramafite–gabbro panels. Division II is in part overlain by a Triassic siliciclastic and limy sedimentary sequence, which resembles the basal Takla Group, Slocan Group, and autochthonous Triassic units. Division III occupies the highest structural levels in the allochthon. With one exception, thrust sheets within it consist of Pennsylvanian to Upper Permian mixed calc-alkaline volcanic and plutonic rocks, chert, tuff, and limestone, assigned to the Harper Ranch Terrane. One panel, assigned to the Yukon–Tanana Terrane, consists of an Early Mississippian quartz diorite pluton with Precambrian inheritance that intrudes older volcanogenic sediments, pyroclastics, limestone, and siliciclastic sediments. Preferred pre-Mesozoic restoration of these terrane elements shows a Harper Ranch arc, built partly on pericratonic Yukon–Tanana and partly on primitive oceanic basement (division III), which is separated from North America by the Slide Mountain marginal basin (divisions I and II).
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Pyle, Leanne J., and Christopher R. Barnes. "Lower Paleozoic stratigraphic and biostratigraphic correlations in the Canadian Cordillera: implications for the tectonic evolution of the Laurentian margin." Canadian Journal of Earth Sciences 40, no. 12 (December 1, 2003): 1739–53. http://dx.doi.org/10.1139/e03-049.

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The ancient Laurentian margin rifted in the latest Neoproterozoic to early Cambrian but appears not to have developed as a simple passive margin through a long, post-rift, drift phase. Stratigraphic and conodont biostratigraphic information from four platform-to-basin transects across the margin has advanced our knowledge of the early Paleozoic evolution of the margin. In northeastern British Columbia, two northern transects span the Macdonald Platform to Kechika Trough and Ospika Embayment, and a third transect spans the parautochthonous Cassiar Terrane. In the southern Rocky Mountains, new conodont biostratigraphic data for the Ordovician succession of the Bow Platform is correlated to coeval basinal facies of the White River Trough. In total, from 26 stratigraphic sections, over 25 km of strata were measured and > 1200 conodont samples were collected that yielded over 100 000 conodont elements. Key zonal species were used for regional correlation of uppermost Cambrian to Middle Devonian strata along the Cordillera. The biostratigraphy temporally constrains at least two periods of renewed extension along the margin, in the latest Cambrian and late Early Ordovician. Alkalic volcanics associated with abrupt facies changes across the ancient shelf break, intervals of slope debris breccia deposits, and distal turbidite flows suggest the margin was characterized by intervals of volcanism, basin foundering, and platform flooding. Siliciclastics in the succession were sourced by a reactivation of tectonic highs, such as the Peace River Arch. Prominent hiatuses punctuate the succession, including unconformities of early Late Ordovician, sub-Llandovery, possibly Early to Middle Silurian and Early Devonian ages.
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Ferri, Filippo. "Nina Creek Group and Lay Range Assemblage, north-central British Columbia: remnants of late Paleozoic oceanic and arc terranes." Canadian Journal of Earth Sciences 34, no. 6 (June 1, 1997): 854–74. http://dx.doi.org/10.1139/e17-070.

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In north-central British Columbia, a belt of upper Paleozoic volcanic and sedimentary rocks lies between Mesozoic arc rocks of Quesnellia and Ancestral North America. These rocks belong to two distinct terranes: the Nina Creek Group of the Slide Mountain terrane and the Lay Range Assemblage of the Quesnel terrane. The Nina Creek Group is composed of Mississippian to Late Permian argillite, chert, and mid-ocean-ridge tholeiitic basalt, formed in an ocean-floor setting. The sedimentary and volcanic rocks, the Mount Howell and Pillow Ridge successions, respectively, form discrete, generally coeval sequences interpreted as facies equivalents that have been interleaved by thrusting. The entire assemblage has been faulted against the Cassiar terrane of the North American miogeocline. West of the Nina Creek Group is the Lay Range Assemblage, correlated with the Harper Ranch subterrane of Quesnellia. It includes a lower division of Mississippian to Early Pennsylvanian sedimentary and volcanic rocks, some with continental affinity, and an upper division of Permian island-arc, basaltic tuffs and lavas containing detrital quartz and zircons of Proterozoic age. Tuffaceous horizons in the Nina Creek Group imply stratigraphic links to a volcanic-arc terrane, which is inferred to be the Lay Range Assemblage. Similarly, gritty horizons in the lower part of the Nina Creek Group suggest links to the paleocontinental margin to the east. It is assumed that the Lay Range Assemblage accumulated on a piece of continental crust that rifted away from ancestral North America in the Late Devonian to Early Mississippian by the westward migration of a west-facing arc. The back-arc extension produced the Slide Mountain marginal basin in which the Nina Creek Group was deposited. Arc volcanism in the Lay Range Assemblage and other members of the Harper Ranch subterrane was episodic rather than continuous, as was ocean-floor volcanism in the marginal basin. The basin probably grew to a width of hundreds rather than thousands of kilometres.
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Anderson, P. G., and C. Jay Hodgson. "The structure and geological development of the Erickson gold mine, Cassiar District, British Columbia, with implications for the origin of mother-lode-type gold deposits." Canadian Journal of Earth Sciences 26, no. 12 (December 1, 1989): 2645–60. http://dx.doi.org/10.1139/e89-225.

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The Erickson gold mine is a typical gold quartz vein deposit. The veins are hosted by a thrust-imbricated, gently dipping, synformal allochthon of low-grade metamorphic, Devonian to Upper Triassic basalts, argillites, and peridotites of oceancrustal origin belonging to the Sylvester Group, part of the Slide Mountain assemblage. The Sylvester allochthon lies concordantly on Devonian miogeoclinal sedimentary rocks of the North American continental margin and was emplaced in the Middle Jurassic as a result of the collision of the Quesnel arc with North America. The veins in the mine are hosted mainly by a moderately dipping system of shear zones with approximately orthorhombic symmetry, indicating a triaxial bulk, inhomogeneous strain pattern superimposed on the earlier formed, gently dipping thrusts. Steeply dipping extension veinlets, rotation of schistosity, and downdip slickenlines indicate the maximum shortening axis was subvertical. The veins display complex superimposed ribbon and breccia textures, indicating incremental growth. Most of the gold occurs in association with tetrahedrite, sphalerite, and chalcopyrite in steeply dipping, late, grey quartz veinlets localized within and striking perpendicular to the main veins. The vein-forming event, dated at 130 Ma, appears to have been related to extension and high heat flow associated with the rise of the Omenica geanticline, in turn the result of crustal thickening caused by the collision of the amalgamated Quesnel arc – North America plate with Stikinia in the Middle Jurassic.
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Sketchley, Dale A., A. J. Sinclair, and C. I. Godwin. "Early Cretaceous gold–silver mineralization in the Sylvester allochthon, near Cassiar, north central British Columbia." Canadian Journal of Earth Sciences 23, no. 9 (September 1, 1986): 1455–58. http://dx.doi.org/10.1139/e86-139.

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K–Ar dates on sericite from several gold–silver bearing white quartz veins in the Cassiar area indicate that mineralization occurred in the Early Cretaceous at about 130 Ma. Thus, these veins predate the mid-Cretaceous Cassiar batholith and Late Cretaceous and early Tertiary plutons in the immediate area. The Early Cretaceous date probably represents either a thermal precursor to emplacement of the Cassiar batholith or a structurally related event associated with allochthonous emplacement of the Sylvester Group. Either of these events may have caused circulation of the meteoric fluids responsible for the veins.
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Erdmer, P., and H. Baadsgaard. "2.2 Ga age of zircons in three occurrences of Upper Proterozoic clastic rocks of the northern Cassiar terrane, Yukon and British Columbia." Canadian Journal of Earth Sciences 24, no. 9 (September 1, 1987): 1919–24. http://dx.doi.org/10.1139/e87-182.

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Analyses of detrital zircons from three occurrences of Upper Proterozoic clastic rocks of the northern Cassiar terrane in Yukon and northern British Columbia yield a U–Pb age of 2224 ± 22 Ma. The zircons apparently belong to a single population similar in age to zircons in stratigraphically equivalent rocks of the southern Cassiar terrane and to zircons in rocks in the Yukon–Tanana terrane of Alaska. A source terrane or area of the required age and extent has not yet been identified.
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Dissertations / Theses on the topic "Cassiar Mountains British Columbia"

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Fleming, Erin Mattea. "Reconstruction of holocene environmental changes in northern British Columbia using fossil midges." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2811.

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Lake sediments contain the remains of midge communities that may be used as biological proxies for inferring past environmental changes. Freshwater midges, including Chironomidae and Chaoboridae, from two alpine tarns (Pyramid Lake and Bullwinkle Lake) in the Cassiar Mountains of northern British Columbia were used to estimate Holocene palaeotemperature changes, and more specifically, to test for the presence of the Milankovitch thermal maximum, an early Holocene warm interval coinciding with peak Holocene summer solar insolation. Mean July air temperatures were reconstructed using midge-inference models developed via weighted averaging-partial least squares (WA-PLS) regression. Cold-tolerant midge taxa dominate the stratigraphies from both Pyramid and Bullwinkle Lakes; however, warm-adapted species are more common in Bullwinkle Lake. Early Holocene warming is apparent at both lakes, however it is unclear whether this is indicative of the Milankovitch thermal maximum. A decrease in temperature occurs from 8,700-7,900 cal. yr BP at Pyramid Lake, around the same time that the 8,200 cal. yr BP cooling event occurred in the northern hemisphere. During the middle Holocene, records from Pyramid Lake indicate an overall decrease in temperature, with a short period of warmer temperatures that peak at 5,100 cal. yr BP. Temperatures fluctuate little during this time at Bullwinkle Lake. A short warming phase is apparent at both lakes during the late Holocene. July temperatures are highest at 2,000 cal. yr BP (10.5°C) in Pyramid Lake and at 1,200 cal. yr BP (13°C) in Bullwinkle Lake. Thereafter, temperatures return to what they were before the warming occurred, and at Bullwinkle Lake, vary little throughout the remainder of the Holocene.
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Mazzucchi, David. "Holocene environmental reconstruction of the Cassiar region, northwestern British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ53009.pdf.

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Feick, Jenny L. "Evaluating ecosystem management in the Columbia Mountains of British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0020/NQ54777.pdf.

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Ball, Mathew C. N. "Geology of the McDame gold camp, Cassiar, British Columbia, implications for lode-gold metallogenesis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22444.pdf.

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Sketchley, Dale Albert. "The nature of carbonate alteration in basalt at Erickson Gold Mine, Cassiar, north-central British Columbia." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26075.

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The Erickson mine is within the McDame lode gold camp, aproximately 12 km southeast of Cassiar, British Columbia. The mine is in mafic volcanic, ultramafic and sedimentary rocks of the Upper Paleozoic to Lower Mesozoic Sylvester Allochthon. Gold-silver mineralization occurs in white quartz veins that are mostly within mafic volcanic rocks. K-Ar dates from sericite in gold-silver-bearing white quartz veins indicate that mineralization occurred in the Early Cretaceous at about 130 Ma. Thus, these veins predate the mid-Cretaceous Cassiar batholith and Lower Cretaceous and Early Tertiary plutons in the immediate area. However, the Early Cretaceous date probably represents a thermal event, precursor to emplacement of the Cassiar batholith, which may have caused circulation of the meteoric fluids responsible for the veins. Rocks within the Erickson mine were affected by four types of alteration: synvolcanic hydrotherma1, regional metamorphic, epigenetic hydrothermal and contact metamorphic. The most common type is epigenetic carbonatization of basalt, which occurs as we11-developed envelopes around gold-silver-bearing white quartz veins and carbon veins. Dolomite veins are surrounded by similar carbonate alteration envelopes; these veins postdate white quartz veins and carbon veins. Disseminated and fracture-controlled carbon may be present around white quartz veins and carbon veins. An idealized model of carbonate alteration envelopes is presented based on field observations and mineralogical studies. Rocks within carbonate alteration envelopes are composed of ankerite, siderite, dolomite, quartz, sericite, kaolinite, pyrite, carbon and minor titanium oxides. A generalized model of mineral species distribution throughout the envelopes around white quartz veins, carbon veins and dolomite veins was also developed. Mass balance calculations, using Gresens' (1967) metasomatic equation, indicate the following compositional changes around a gold-silver-bearing white quartz vein: gain of K₂O and SiO₂ ; loss of Na₂O, Fe₂O₃ and MgO; loss of CaO from the outer portion of the envelope and gain in the inner. Loss on ignition and the alteration mineral assemblage indicate gain of at least CO₂ , H₂O and S. Geochemistry of carbonate alteration envelopes was investigated using an aqua regia digestion with multi-element inductively coupled plasma (ICP) analyses and gold-silver fire assays. The ICP analyses were compared to X-ray fluorescence (XRF) analyses to determine the range of extraction and to assist in interpretation. The comparison indicates that if there is strong enrichment in carbonate alteration envelopes surrounding gold-silver-bearing white quartz veins, the ICP analyses will show these patterns well. Strong enrichment in potassium, barium, boron and arsenic, and sporadic enrichment in gold, silver, copper, lead, zinc and antimony occur in carbonatized basalt around gold-silver-bearing white quartz veins.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
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Israel, Steve A. "Tectonic significance of the Atnarko complex, Coast Mountains, British Columbia." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/838.

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The Atnarko complex located in west-central British Columbia comprises pre-Early Jurassic metavolcanic and metasedimentary rocks, termed the Atnarko assemblage, which is structurally interleaved with Late Triassic to Early Cretaceous orthogneiss. The Atnarko assemblage correlates with continental margin assemblages found within the Coast plutonic complex. Tectonic interaction between the Insular and Intermontane superterranes resulted in several phases of deformation including; 1) poorly preserved Jurassic deformation, 2) Early to mid-Cretaceous, southwest to west directed, compression, 3) mid-Cretaceous, north to northeast directed, compression, 4) mid- to Late Cretaceous dextral and sinistral ductile/brittle shearing, and 5) post latest Cretaceous brittle faulting. Peak metamorphism coincides with generation of migmatite in the Early Cretaceous (~117-115 Ma) and is contemporaneous with penetrative ductile fabrics. The Atnarko complex had cooled below 350°C by the Late. Comparison of the Atnarko complex to equivalent portions of the orogen along strike, indicates a post mid-Cretaceous change in structural style. To the northwest the orogen records continued southwest-directed compression which dominates the deformation style; while to the southeast large dextral strike-slip faults dominate. Relative plate motions between ca. 70-60 Ma indicate that dextral transpression occurred between the Kula and North American plates. Strain during this transpressive deformation was partitioned into compressive and translational regions. The Atnarko complex area is situated at the transition between translation and compression. The conditions of the lower and middle crust within the orogen were established by how strain was partitioned across the orogen. The distributed strain also shaped how the orogen responded to Tertiary extension. Continued compression to the northwest of the Atnarko complex led to increased crustal thickness and partial melting of lower and middle crust in the Tertiary. Conversely, the cessation of compression in the southeast lead to a more stable (i.e. cooler) crustal lithosphere. A change in relative plate motions in the early Tertiary triggered full-scale, orogen-perpendicular, collapse in the northwest facilitated by decoupling between the middle and lower crusts along thermally weakened layers. Localized orogen-parallel extension occurred in the southeast which was kinematically linked to large dextral strike-slip faults where the upper crust remained coupled to the middle and lower crust.
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Jones, Penelope Sarah Ann. "Postglacial chronology of large earthflows in south-central British Columbia." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28842.

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Fifty-three earthflows in south-central British Columbia were identified from an air photograph search and from a review of previous geologic reports. Many have parallel 'en echelon1 lateral deposits indicative of several movement phases during the postglacial period, and some have been active during the present century up to the time of the study. The purpose of this study was to date phases of earthflow activity during the postglacial period and relate them to climatic fluctuations. Earthflows in the study area are concentrated in serpentinised peridotite, basalt, sediments (mainly volcaniclastics), and other volcanics. Earthflows take place preferentially down dip in sediments and many are associated with fault lines. All earthflow materials, except those derived from serpentinised peridotite, weather to montmorillonite-rich material, and each yields a characteristic grain-size distribution. Earthflow gradient in the study area depends upon material type, indicating that earthflow texture and mineralogy govern shearing resistance and hence partially determine characteristic slope angles. Earthflow movement during the past 60 years was investigated using air photograph chronosequences dating back to 1928. Reactivations of six flows were identified in the period 1950 to 1960, and an analysis of precipitation records from four stations around the study area showed that the level of winter precipitation increased around 1950. It was concluded that the observed reactivation was a response to rising groundwater levels during a period of increased winter precipitation. Earthflow movement and climatic fluctuations over the last 200 years were investigated in an analysis of tree-ring width records at four sites. Moist phases were recorded in the periods 1800-1830, 1870-1920 and from 1945 to the present. Compression wood formation at three sites corresponded with moist phases, so it was concluded that, over the last two centuries, earthflow movement was probably coincident with phases of higher precipitation. A postglacial climatic chronology was inferred from published pollen analyses and from Neoglacial ice fluctuations, both within and outside the study area. New palynological data were collected from Red Mountain, a high elevation site in the west of the study area. These showed a two-phase cooling period following the close of the Hypsithermal. The first cooling period took place around 6-7,000 BP, and the second around 3,000 BP. Earthflow movement during the postglacial period was analysed using radiocarbon dates, tephrochronology, stratigraphy, carbonate accumulation, and earthflow morphology. Data from twenty-one sites showed that movement was concentrated mainly after 7,000 BP, and at several sites the stratigraphic position of the Bridge River tephra dated movement around 2,400 BP. It was concluded that, at this longer timescale, movement at many sites could be attributed to post-Hypsithermal climatic deterioration.
Arts, Faculty of
Geography, Department of
Graduate
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Reid, Leslie. "Structural evolution of the Isaac Lake Synclinorium, Cariboo Mountains, British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20850.pdf.

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Garwin, Stephen Lee. "Structure and metamorphism in the Niagara Peak area, western Cariboo Mountains, British Columbia." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26259.

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A more than 2000 m thick sequence of Hadrynian to Paleozoic Snowshoe Group metasedimentary rocks of the Omineca Belt (OMB) is exposed near Niagara Peak in the western Cariboo Mountains, central British Columbia. This package contains the northern extremity of the Shuswap Metamorphic Complex and lies 30 km northeast of the accretionary boundary with Intermontane Belt (IMB) Mesozoic sedimentary and volcanic rocks (Quesnellia Terrane) and Upper Paleozoic (?) ophiolitic and sedimentary rocks (Slide Mountain Terrane). Four phases of folding (D₁-D₄) are recognized. D₁ consists of isoclinal folds and transposed compositional layering. D₂ commonly forms southwest verging, open to close folds with subhorizontal axes and moderately northeast dipping axial surfaces. In the eastern part of the area, divergent fanning of D₂ axial surfaces and a reversal of vergence direction occur about a map-scale synform characterized by greater strain, bimodal fold style and a locally penetrative axial planar cleavage. D₃ and D₄ form orthogonal upright open buckles with respective northwest and northeast trending axes. Steeply dipping normal and minor reverse faults crosscut all fold structures, displaying minor offsets. Prograde regional metamorphism reached greenschist grade late in D₁. Staurolite and kyanite growth accompanied D₂, followed by postkinematic sillimanite generation under conditions of approximately 635° C and 5 kb. D₃ associated sericite-chlorite retrogression of porphyroblasts occurs in sub-sillimanite grade rocks in the western part of the area. Synmetamorphic veins represent polyepisodic hydraulic fracture development during progressive dewatering of a sedimentary pile by prograde metamorphism. Eastward obduction of Quesnellia and Slide Mountain Terranes onto theOmineca Belt took place in the Middle Jurassic. Shortly following this event, the IMB-OMB tectonic suture was deformed, forming map-scale folds of cuspate/lobate geometry.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
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Lewis, Peter D. "Polyphase deformation and metamorphism in the western Cariboo Mountains near Ogden Park, British Columbia." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26440.

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The boundary between the Omineca Belt and the Intermontane Belt in Central British Columbia represents the suture between autochthonous North America (Barkerville Terrane) and several allochthonous terranes accreted from the west In the Quesnel Lake region allochthonous sedimentary and volcanic rocks of Quesnellia Terrane, accreted in the Jurassic, are in sharp tectonic contact with underlying siliclastic and carbonate metasedimentary rocks. The Ogden Peak study area is located 10 km east of and structurally below this suture zone and is thus well situated for observing deformational styles within the autochthonous package. Rocks exposed near Ogden Peak comprise the Hadrynian(?) to Paleozoic(?) Snowshoe Group and local diabasic intrusions. These rocks record a deformational history involving four phases of folding (D₁-D₄) and later brittle faulting (D₅). Earliest recognizable structures consist of recumbant isoclinal folds with a well-developed transposed foliation. This foliation is tightly folded about northwest trending, southwest verging second phase structures. Northwest trending third phase structures and northeast trending fourth phase structures occur as both crenulations and open buckles. Southeast dipping faults cut all earlier structures with tens of meters of normal offset Phase 1 and Phase 2 fold styles are compatible with a flattened buckle fold mechanism of formation, associated with elevated temperatures and reduced viscosity contrasts across layering. Later fold styles are controlled by higher viscosity contrasts and detachment along layering. All phases of deformation are dominated by semi-brittle mechanisms of dislocation slip and glide, mechanical twinning, and microcracking. Temperature activated diffusional creep is only locally active and does not contribute appreciably to total strain. The mineral assemblage garnet-staurolite-kyanite defines a metamorphic peak late in D₂. Metamorphic temperatures of approximately 530° C at 6.0 kb have been determined using garnet/biotite geothermometry. Extensive retrograde metamorphism spans D₃ and D₄, overprinting prograde assemblages and providing evidence for abundant fluids late in deformation. Late phase 1 diabase dykes locally intruded an area to the southeast of Ogden Peak. Major and trace element analyses of samples from these intrusions suggest a calc-alkaline, volcanic arc affinity.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
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Books on the topic "Cassiar Mountains British Columbia"

1

Canada, Geological Survey of. Upper Triassic Kutcho Formation Cassiar Mountains, North-Central British Columbia. S.l: s.n, 1986.

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Thorstad, Linda Elaine. The upper Triassic Kutcho formation, Cassiar Mountains, north-central British Columbia. Ottawa, Canada: Geological Survey of Canada, 1986.

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Fritz, W. H. Lithology, trace fossils, and correlation of Precambrian-Cambrian boundary beds, Cassiar Mountains, North-Central British Columbia. Ottawa: Energy, Mines and Resources Canada, 1985.

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Evenchick, C. A. Stratigraphy, metamorphism, structure, and their tectonic implications in the Sifton and Deserters ranges, Cassiar and northern Rocky mountains, northern British Columbia. Ottawa, Canada: Energy, Mines and Resources Canada, 1988.

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1951-, Woods G., ed. Movements and habitats of caribou in the mountains of southern British Columbia. Nelson, B.C: Wildlife Branch, Ministry of Environment and Parks, 1987.

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Canada, Geological Survey of. Stratigraphy and Structure of the Mount Selwyna Rea, Rocky Mountains, Northeastern British Columbia. S.l: s.n, 1985.

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McMechan, Margaret E. Stratigraphy and structure of the Mount Selwyn area, Rocky Mountains, Northeastern British Columbia. [Ottawa]: Energy, Mines, and Resources Canada, 1987.

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John, Molyneux St. The sea of mountains: An account of Lord Dufferin's tour through British Columbia in 1876. London: Hurst and Blackett, 2003.

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John, Molyneux St. The sea of mountains: An account of Lord Dufferin's tour through British Columbia in 1876. London: Hurst and Blackett, 2003.

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Dodds, C. J. Potassium-argon ages of mainly intrusive rocks in the Saint Elias Mountains, Yukon and British Columbia. Ottawa, Canada: Energy, Mines and Resources Canada, 1988.

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Book chapters on the topic "Cassiar Mountains British Columbia"

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Souch, Catherine. "Reconstructing Past Watershed and Ecosystem Development in the Coast Mountains, British Columbia, Canada." In WorldMinds: Geographical Perspectives on 100 Problems, 497–501. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2352-1_81.

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Owens, C. E., and M. B. Rutherford. "A resort municipality without residents? The case of Jumbo Glacier resort in the Purcell Mountains of British Columbia, Canada." In Winter tourism: trends and challenges, 425–41. Wallingford: CABI, 2019. http://dx.doi.org/10.1079/9781786395207.0425.

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Hollister, Lincoln S., and Christopher Andronicos. "The Central Gneiss Complex, Coast Mountains, British Columbia." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.45.

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McClelland, William C., and James M. Mattinson. "Cretaceous-Tertiary evolution of the western Coast Mountains, central Southeastern Alaska." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.159.

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Stowell, Harold H., Nathan L. Green, and Robert J. Hooper. "Geochemistry and tectonic setting of basaltic volcanism, northern Coast Mountains, southeastern Alaska." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.235.

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Rusmore, Margaret E., G. J. Woodsworth, and George E. Gehrels. "Late Cretaceous evolution of the eastern Coast Mountains, Bella Coola, British Columbia." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.89.

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Crawford, Maria Luisa, William A. Crawford, and George E. Gehrels. "Terrane assembly and structural relationships in the eastern Prince Rupert Quadrangle, British Columbia." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.1.

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Saleeby, Jason B. "Geochronologic investigations along the Alexander-Taku terrane boundary, southern Revillagigedo Island to Cape Fox areas, southeast Alaska." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.107.

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Rubin, Charles M., and Jason B. Saleeby. "U-Pb geochronology of mid-Cretaceous and Tertiary plutons along the western edge of the Coast Mountains, Revillagigedo Island, and Portland Peninsula, southeast Alaska." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.145.

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Stowell, Harold H., and Michelle A. Pike. "One-dimensional thermal models of metamorphism resulting from the Coast Plutonic Complex sill, northern Coast Mountains, southeastern Alaska." In Tectonics of the Coast Mountains, Southeastern Alaska and British Columbia. Geological Society of America, 2000. http://dx.doi.org/10.1130/0-8137-2343-4.183.

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Conference papers on the topic "Cassiar Mountains British Columbia"

1

Dafov, Michelle Nikolay. "BRITISH COLUMBIA COAST MOUNTAINS METASEDIMENTARY ROCKS: AGE CONSTRAINTS AND PROVENANCE." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284530.

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Roberts, Nicholas J., Marten Geertsema, Eva Kwoll, John Clague, and Jeremy G. Venditti. "SIGNATURES OF LANDSLIDE-GENERATED WAVES IN THE SOUTHERNMOST COAST MOUNTAINS, BRITISH COLUMBIA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-307051.

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Cecil, M. Robinson, Margaret E. Rusmore, George E. Gehrels, Glenn J. Woodsworth, Intan N. Yokelson, Charles Chisom, Marshall Trautman, and Emily Homan. "ALONG-STRIKE VARIATION IN THE MAGMATIC DEVELOPMENT OF THE COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287724.

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Rusmore, Margaret E., Glenn J. Woodsworth, M. Robinson Cecil, Elizabeth M. Bollen, Harold H. Stowell, George E. Gehrels, and Marty J. Grove. "NEWLY RECOGNIZED LATEST CRETACEOUS TRANSCURRENT FAULTING WITHIN THE COAST MOUNTAINS BATHOLITH (CMB), BRITISH COLUMBIA." In 115th Annual GSA Cordilleran Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019cd-329318.

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Young, Pinkie L., Margaret E. Rusmore, Glenn J. Woodsworth, M. Robinson Cecil, and Harold H. Stowell. "NEW AL-IN-HORNBLENDE CRYSTALLIZATION PRESSURES FROM THE SOUTHERN COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-302808.

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Aleksey, Matthew, Margaret E. Rusmore, Harold H. Stowell, M. Robinson Cecil, and Savanna Gutapfel. "EVIDENCE FOR THE NORTHERN CONTINUATION OF EOCENE CRUSTAL EXTENSION, NORTHERN COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358205.

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Boag, Thomas, James Busch, Zachary T. Sickmann, Justin V. Strauss, and Erik A. Sperling. "INTEGRATED CHEMOSTRATIGRAPHY, GEOCHRONOLOGY, AND PALEONTOLOGY OF EDIACARAN DEPOSITS FROM THE CARIBOO MOUNTAINS, BRITISH COLUMBIA, CANADA." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-360071.

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Jørgensen, F., A. Menghini, G. Vignoli, A. Viezzoli, C. Salas, M. E. Best, and S. A. S. Pedersen. "Structural Geology Interpreted from AEM Data - Folded Terrain at the Foothills of Rocky Mountains, British Columbia." In Second European Airborne Electromagnetics Conference. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201702160.

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Bollen, Elizabeth M., Harold H. Stowell, Margaret E. Rusmore, and Glenn J. Woodsworth. "PRELIMINARY AGES FOR REGIONAL METAMORPHISM IN THE MT. WADDINGTON AREA OF THE SOUTHERN COAST MOUNTAINS BATHOLITH, BRITISH COLUMBIA, CANADA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287981.

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Miller, Robert Bruce, John D. Lee, and Natasha Budimirovic. "INSIGHTS INTO HIGHLY ELONGATE, STEEPLY SHEETED ARC PLUTONS FROM INTRUSIONS IN THE SE COAST MOUNTAINS, BRITISH COLUMBIA AND WASHINGTON." In 116th Annual GSA Cordilleran Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020cd-347165.

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Reports on the topic "Cassiar Mountains British Columbia"

1

Thorstad, L. E., and H. Gabrielse. The upper triassic kutcho formation, Cassiar mountains, north-central British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/121064.

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Fritz, W. H., and T. P. Crimes. Lithology, trace fossils and correlation of Precambrian-Cambrian boundary beds, Cassiar Mountains, north-central British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120142.

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Evenchick, C. A. Stratigraphy, metamorphism, structure, and their tectonic implication in the Sifton and Deserters Ranges, Cassiar and northern Rocky Mountains, northern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/125164.

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Cecile, M. P., and A. Legun. Preliminary geology, Mount McCusker, Peace River - Cassiar District, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/212286.

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Harms, T. A. Cross-sections through Sylvester Allochthon and underlying Cassiar Platform, northern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120260.

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Nesbitt, B. E., P. A. Cavell, and K. Muehlenbachs. Isotopic Characteristics of the McDame Gold-Silver Deposits, Cassiar District, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127436.

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McMechan, M. E., R. G. Anderson, B. C. Richards, and W. J. Davis. Cross River sills, Rocky Mountains, southeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/300554.

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Cookenboo, H. O., and R. M. Bustin. Lithostratigraphy of the northern Skeena Mountains, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131451.

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Couture, R., and S. G. Evans. The East Gate Landslide, Beaver Valley, Glacier National Park, Columbia Mountains, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211403.

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Doucet, P., E. D. Ghent, and P. S. Simony. Metamorphism in the Monashee Mountains, east of Blue River, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120026.

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