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Journal articles on the topic 'Rocks, Igneous. Geology, Stratigraphic Geology'

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Published: 4 June 2021

Last updated: 9 February 2022

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1

Ricci, Carlo Alberto, Francisco Hervé, Johan R. Krynauw, and Wesley E. Lemasurier. "Naming of igneous and metamorphic rock units in Antarctica: recommendation by the SCAR Working Group on Geology." Antarctic Science 5, no. 1 (1993): 103–4. http://dx.doi.org/10.1017/s0954102093000124.

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Geologists from many countries have worked in Antarctica since the turn of the twentieth century and during the past thirty years the level of research activity on the continent has increased annually. As a result there has been a proliferation of stratigraphical names and lithostratigraphical schemes (Thomson, 1990). Furthermore, geologists from different nations are familiar with different standards and codes of nomenclature, which has resulted in a number of inconsistencies in Antarctic stratigraphical names. The SCAR Working Groups on Geology and Solid Earth Geophysics therefore recommende

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2

Sissingh, W. "Palaeozoic and Mesozoic igneous activity in the Netherlands: a tectonomagmatic review." Netherlands Journal of Geosciences - Geologie en Mijnbouw 83, no. 2 (2004): 113–34. http://dx.doi.org/10.1017/s0016774600020084.

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AbstractTo date, igneous rocks, either intrusive or extrusive, have been encountered in the Palaeozoic-Mesozoic sedimentary series of the Netherlands in some 65 exploration and production wells. Following 17 new isotopic K/Ar age determinations of the recovered rock material (amounting to a total of 28 isotopic ages from 21 different wells), analysis of the stratigraphic distribution of the penetrated igneous rock bodies showed that the timing of their emplacement was importantly controlled by orogenic phases involving intra-plate wrench and rift tectonics. Magmatism coincided with the Acadian

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3

Casé, A. M., L. López-Escobar, J. C. Danieli, and A. Schalamuk. "Butalón igneous rocks, Neuquén, Argentina: Age, stratigraphic relationships and geochemical features." Journal of South American Earth Sciences 26, no. 2 (2008): 188–203. http://dx.doi.org/10.1016/j.jsames.2007.11.001.

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4

Yager, Douglas B., Albert H. Hofstra, Katheryn Fifarek, and Ank Webbers. "Development of an igneous rock database with geologic functions: Application to Neogene bimodal igneous rocks and mineral resources in the Great Basin." Geosphere 6, no. 5 (2010): 691–730. http://dx.doi.org/10.1130/ges00516.1.

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Abstract Geologists routinely use sample data (descriptive, qualitative, quantitative) to characterize a hierarchy of larger geologic features that each have their own independent attributes, use physical relationships between geologic features to establish their relative ages, combine this information with dated features to understand evolutionary histories of study areas at various scales, and produce maps to display such information in space and time relative to other features of interest. This paper demonstrates how we integrated such routine geologic functions into an existing igneous roc

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Zhu, Bei, Zhaojie Guo, Shaonan Zhang, Ingrid Ukstins, Wei Du, and Runchao Liu. "What triggered the early-stage eruption of the Emeishan large igneous province?" GSA Bulletin 131, no. 11-12 (2019): 1837–56. http://dx.doi.org/10.1130/b35030.1.

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Abstract The formation of the Emeishan large igneous province is widely regarded as being related to a mantle plume, but plate tectonics may also have played an important role. We analyzed the regional facies architecture of the early-stage subaqueous volcanic rocks of the central Emeishan large igneous province. The results suggest that these rocks were emplaced in a N-S–striking subaqueous rift, which existed immediately before the onset of volcanism and was persistently maintained during the early eruption stage. By linking this conclusion with the background information indicating that (1)

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6

Lopes, Rosana Peporine, and Mabel Norma Costas Ulbrich. "Geochemistry of the alkaline volcanicsubvolcanic rocks of the Fernando de Noronha Archipelago, southern Atlantic Ocean." Brazilian Journal of Geology 45, no. 2 (2015): 307–33. http://dx.doi.org/10.1590/23174889201500020009.

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<p>The Fernando de Noronha Archipelago presents, on its main island, a centrally-located stratigraphic unit, the Remédios Formation (age around 8 - 12 Ma) constituted by basal pyroclastic rocks intruded by dikes, plugs and domes of varied igneous rocks, capped by flows and pyroclastics of mafic to ultramafic rocks of the Quixaba Formation (age around 1 - 3 Ma), which is limited from the underlying unit by an extensive irregular erosion surface. A predominant sodic Remédios series (basanites, tephrites, tephriphonolites, essexite, phonolites) can be separated from a moderately potassic Re

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Schaubs, Peter M., and Sharon D. Carr. "Geology of metasedimentary rocks and Late Cretaceous deformation history in the northern Valhalla complex, British Columbia." Canadian Journal of Earth Sciences 35, no. 9 (1998): 1018–36. http://dx.doi.org/10.1139/e98-048.

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The Valhalla complex, a Cordilleran metamorphic core complex, is a domal culmination made up of gently dipping interlayered sheets of igneous and supracrustal rocks that were deformed and metamorphosed in the Middle Jurassic and Late Cretaceous, and exhumed by extensional faults in the Eocene. Mapping, fabric, and metamorphic studies of predominantly metasedimentary rocks in Valhalla and Passmore domes in the northern part of the complex, together with published geochronological data, reveal a significant Late Cretaceous tectonic history. This includes extensive magmatism, the culmination of u

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Sampson, Lee M., and Nicholas C. Williams. "The geophysical response of the Goldrush-Fourmile orebody and implications for camp-scale Carlin-type deposit exploration, Cortez District, Nevada." Leading Edge 40, no. 2 (2021): 122–28. http://dx.doi.org/10.1190/tle40020122.1.

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Since discovery of the Goldrush and Fourmile deposits, numerous geophysical surveys have been acquired over the footprint of mineralization and surrounding areas to focus exploration. The Goldrush-Fourmile system extends more than 7 km in strike length and averages approximately 300 m wide. Most of the orebody lies more than 300 m below ground surface and continues to depths of more than 900 m. Direct detection of the ore system using geophysical tools is impeded by several factors. The system is relatively flat lying and sits in the hinge of a doubly plunging anticline. This gives the shallow

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Gardiner, David, Nick Schofield, Alex Finlay, et al. "Modeling petroleum expulsion in sedimentary basins: The importance of igneous intrusion timing and basement composition." Geology 47, no. 10 (2019): 904–8. http://dx.doi.org/10.1130/g46578.1.

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Abstract The concept of a critical moment in a petroleum system (the time of highest probability of entrapment and preservation of oil and gas) has underlain petroleum exploration for over 25 years. However, one area where understanding the critical moment is challenging is the Faroe-Shetland Basin (FSB; offshore UK). Isotopic dating of oils suggests that petroleum generation began between ca. 68 and 90 Ma; however, most basin models invoke an earlier generation beginning in the mid-Cretaceous at ca. 100 Ma, predating deposition of Paleocene and Eocene reservoirs. This time discrepancy has pre

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CORFU, FERNANDO, STÉPHANE POLTEAU, SVERRE PLANKE, et al. "U–Pb geochronology of Cretaceous magmatism on Svalbard and Franz Josef Land, Barents Sea Large Igneous Province." Geological Magazine 150, no. 6 (2013): 1127–35. http://dx.doi.org/10.1017/s0016756813000162.

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AbstractThe opening of the Arctic oceanic basins in the Mesozoic and Cenozoic proceeded in steps, with episodes of magmatism and sedimentation marking specific stages in this development. In addition to the stratigraphic record provided by sediments and fossils, the intrusive and extrusive rocks yield important information on this evolution. This study has determined the ages of mafic sills and a felsic tuff in Svalbard and Franz Josef Land using the isotope dilution thermal ionization mass spectrometry (ID-TIMS) U–Pb method on zircon, baddeleyite, titanite and rutile. The results indicate cry

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HUGHES, NIGEL C., PAUL M. MYROW, N. RYAN MCKENZIE, et al. "Cambrian rocks and faunas of the Wachi La, Black Mountains, Bhutan." Geological Magazine 148, no. 3 (2010): 351–79. http://dx.doi.org/10.1017/s0016756810000750.

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AbstractThe Pele La Group in the Wachi La section in the Black Mountains of central Bhutan represents the easternmost exposure of Cambrian strata known in the Himalaya. The group contains a succession of siliciclastic rocks with minor amounts of carbonate, the uppermost unit of which, the Quartzite Formation, bears age-diagnostic trilobite body fossils that are approximately 493 Ma old. Trilobite species includeKaolishania granulosa, Taipaikia glabraand the new speciesLingyuanaspis sangae.A billingsellid brachiopod,Billingsellacf.tonkiniana, is co-occurrent. This fauna is precisely correlated

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Campbell, Roderick W., Luke P. Beranek, Stephen J. Piercey, and Richard Friedman. "Early Paleozoic post-breakup magmatism along the Cordilleran margin of western North America: New zircon U-Pb age and whole-rock Nd- and Hf-isotope and lithogeochemical results from the Kechika group, Yukon, Canada." Geosphere 15, no. 4 (2019): 1262–90. http://dx.doi.org/10.1130/ges02044.1.

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AbstractPost-breakup magmatic rocks are recognized features of modern and ancient passive margin successions around the globe, but their timing and significance to non-plume-related rift evolution is generally uncertain. Along the Cordilleran margin of western North America, several competing rift models have been proposed to explain the origins of post-breakup igneous rocks that crop out from Yukon to Nevada. New zircon U-Pb age and whole-rock geochemical studies were conducted on the lower Paleozoic Kechika group, south-central Yukon, to test these rift models and constrain the timing, mantl

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Zhong, Yuting, Roland Mundil, Jun Chen, et al. "Geochemical, biostratigraphic, and high-resolution geochronological constraints on the waning stage of Emeishan Large Igneous Province." GSA Bulletin 132, no. 9-10 (2020): 1969–86. http://dx.doi.org/10.1130/b35464.1.

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Abstract The initiation and peak magmatic periods of the Emeishan Large Igneous Province (LIP) are well constrained by both biostratigraphic and radioisotopic dating methods; however, the age of cessation of volcanism is poorly constrained and continues to be debated. Marine carbonates interbedded with volcanic ashes across the Guadalupian–Lopingian boundary (GLB) are widespread in south China, and these ashes provide an opportunity to study its timing, origin, and potential relationship with the Emeishan LIP. Here we present biostratigraphic constraints, mineralogical and geochemical characte

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Rocha, Brenda C., Joshua H. F. L. Davies, Valdecir A. Janasi, et al. "Rapid eruption of silicic magmas from the Paraná magmatic province (Brazil) did not trigger the Valanginian event." Geology 48, no. 12 (2020): 1174–78. http://dx.doi.org/10.1130/g47766.1.

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Abstract The Valanginian Stage is marked by a period of global positive δ13C carbon cycle perturbation and biotic crises, which are collectively referred to as the Valanginian event (VE). Many attempts have been made to link the Paraná-Etendeka large igneous province volcanism with the VE. However, currently there is no conclusive proof to support this hypothesis, since the timing and duration of the volcanic activity are not known with sufficient precision. In this study, we significantly revise the time scales of magmatism and environmental impact of the Paraná magmatic province (PMP) in Bra

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15

Lanzafame, Gabriele, Federico Casetta, Pier Paolo Giacomoni, Massimo Coltorti, and Carmelo Ferlito. "The Rare Trachyandesitic Lavas at Mount Etna: A Case Study to Investigate Eruptive Process and Propose a New Interpretation for Magma Genesis." Minerals 11, no. 3 (2021): 333. http://dx.doi.org/10.3390/min11030333.

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The growth of Mount Etna volcano reflects the superimposition of various eruptive centers, the most voluminous of which is the Ellittico, whose stratigraphic sequence is well exposed on the steep walls of Valle del Bove. The uppermost levels of the sequence have been sampled and investigated through a new set of geochemical data on mineral phases and bulk rock. Sampled rocks display a marked bimodality with aphyric banded trachyandesites, which are some of the most evolved and rare products of the entire Etnean succession (SiO2 58–60 wt.%), intercalated in plagioclase rich porphyritic mugearit

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16

Box, Stephen E., Susan M. Karl, James V. Jones, Dwight C. Bradley, Peter J. Haeussler, and Paul B. O’Sullivan. "Detrital zircon geochronology along a structural transect across the Kahiltna assemblage in the western Alaska Range: Implications for emplacement of the Alexander-Wrangellia-Peninsular terrane against North America." Geosphere 15, no. 6 (2019): 1774–808. http://dx.doi.org/10.1130/ges02060.1.

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Abstract The Kahiltna assemblage in the western Alaska Range consists of deformed Upper Jurassic and Cretaceous clastic strata that lie between the Alexander-Wrangellia-Peninsular terrane to the south and the Farewell and other pericratonic terranes to the north. Differences in detrital zircon populations and sandstone petrography allow geographic separation of the strata into two different successions, each consisting of multiple units, or petrofacies, with distinct provenance and lithologic characteristics. The northwestern succession was largely derived from older, inboard pericratonic terr

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17

Trop, Jeffrey M., Jeffrey A. Benowitz, Donald Q. Koepp, et al. "Stitch in the ditch: Nutzotin Mountains (Alaska) fluvial strata and a dike record ca. 117–114 Ma accretion of Wrangellia with western North America and initiation of the Totschunda fault." Geosphere 16, no. 1 (2019): 82–110. http://dx.doi.org/10.1130/ges02127.1.

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Abstract The Nutzotin basin of eastern Alaska consists of Upper Jurassic through Lower Cretaceous siliciclastic sedimentary and volcanic rocks that depositionally overlie the inboard margin of Wrangellia, an accreted oceanic plateau. We present igneous geochronologic data from volcanic rocks and detrital geochronologic and paleontological data from nonmarine sedimentary strata that provide constraints on the timing of deposition and sediment provenance. We also report geochronologic data from a dike injected into the Totschunda fault zone, which provides constraints on the timing of intra–sutu

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Osorio-Granada, E., A. Pardo-Trujillo, S. A. Restrepo-Moreno, et al. "Provenance of Eocene–Oligocene sediments in the San Jacinto Fold Belt: Paleogeographic and geodynamic implications for the northern Andes and the southern Caribbean." Geosphere 16, no. 1 (2019): 210–28. http://dx.doi.org/10.1130/ges02059.1.

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Abstract Mesozoic and Cenozoic strata of the San Jacinto Fold Belt (Colombian Caribbean) provide insights about sedimentary environments and paleogeographic evolution in the transition between the northern Andes and the South Caribbean deformed belt. We report new provenance (conventional sandstone petrography, heavy mineral analysis, and detrital zircon U-Pb geochronology and typology) and micropaleontologic data (palynology, calcareous nannofossils, and foraminifera) in samples collected from the lower Eocene (San Cayetano Formation) and upper Eocene–Oligocene (Toluviejo and Ciénaga de Oro F

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LORENZ, HENNING, DAVID G. GEE, and MARTIN J. WHITEHOUSE. "New geochronological data on Palaeozoic igneous activity and deformation in the Severnaya Zemlya Archipelago, Russia, and implications for the development of the Eurasian Arctic margin." Geological Magazine 144, no. 1 (2006): 105–25. http://dx.doi.org/10.1017/s001675680600272x.

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The Severnaya Zemlya Archipelago, located close to the continental edge of the Kara Shelf in the Russian high Arctic, represents, together with northern Tajmyr, the exposed Neoproterozoic and Palaeozoic part of the North Kara Terrane. This terrane has been interpreted as an independent microcontinent or part of a larger entity, such as Arctida or Baltica, prior to collision with Siberia in Late Carboniferous time. A major stratigraphic break, the Kan'on (canyon) River Unconformity, separates folded Late Cambrian from Early Ordovician successions in one area, October Revolution Island. New geoc

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Johansson, Å., D. G. Gee, L. Björklund, and P. Witt-Nilsson. "Isotope studies of granitoids from the Bangenhuk Formation, Ny Friesland Caledonides, Svalbard." Geological Magazine 132, no. 3 (1995): 303–20. http://dx.doi.org/10.1017/s0016756800013625.

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AbstractThe Caledonian Hecla Hoek succession in Ny Friesland, eastern Svalbard has been interpreted, for many decades, to be a continuous stratigraphic sequence. Early Palaeozoic and Neoproterozoic strata in its upper parts pass more or less conformably down into amphibolite facies rocks (Stubendorffbreen Supergroup) at depth. Recent isotopic age-determination and structural studies have indicated that the Stubendorffbreen succession is tectonostratigraphic and made up of at least three major thrust sheets. This paper provides new data from two meta-igneous units within the succession, the Ban

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Zakharova, N. V., D. S. Goldberg, P. E. Olsen, D. Collins, and D. V. Kent. "Reservoir and sealing properties of the Newark rift basin formations: Implications for carbon sequestration." Leading Edge 39, no. 1 (2020): 38–46. http://dx.doi.org/10.1190/tle39010038.1.

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The Newark Basin is one of the major Mesozoic rift basins along the U.S. Atlantic coast evaluated for carbon dioxide (CO2) storage potential. Its geologic setting offers an opportunity to assess both the traditional reservoir targets, e.g., fluvial sandstones, and less traditional options for CO2 storage, e.g., mafic intrusions and lavas. Select samples from the basal, predominantly fluvial, Stockton Formation are characterized by relatively high porosity (8%–18%) and air permeability (0.1–50 mD), but borehole hydraulic tests suggest negligible transmissivity even in the high-porosity interval

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John-Joe, Traynor. "Arenig sedimentation and basin tectonics in the Harlech Dome area (Dolgellau Basin), North Wales." Geological Magazine 127, no. 1 (1990): 13–30. http://dx.doi.org/10.1017/s0016756800014138.

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AbstractArenig (Ordovician) clastic sediments crop out in the Harlech Dome region (North Wales), and are placed in a single stratigraphic unit: the Allt Lwyd Formation. This unit records a marine transgression onto an erosion surface produced during late Tremadoc arc volcanicity. Four discrete petrofacies are denned, and reflect differing proportions of detritus derived from Tremadoc-type basic-intermediate igneous rocks, and the local sedimentary basement. Initial shallow marine siliciclastic sandstones and conglomerates are overlain by extensive deep water mud-rich units. These generally sha

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Bowman, Sarah J., Georgia Pe-Piper, David J. W. Piper, Robert A. Fensome, and Edward L. King. "Early Cretaceous volcanism in the Scotian Basin 1This article is one of a series of papers published in this CJES Special Issue on the theme of Mesozoic–Cenozoic geology of the Scotian Basin." Canadian Journal of Earth Sciences 49, no. 12 (2012): 1523–39. http://dx.doi.org/10.1139/e2012-063.

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Early Cretaceous volcanism is widespread in the eastern Scotian Basin. The stratigraphic position of volcanic rocks within wells was re-evaluated and the volcanological character of the rocks was refined by study of cuttings and well logs. Hauterivian–Barremian volcanic rocks on the SW Grand Banks and Aptian–Albian volcanic rocks in the Orpheus Graben and SE Scotian Shelf resulted from Strombolian type eruptions. More extensive Hawaiian type flows were mapped from seismic profiles near the Mallard and Brant wells on the SW Grand Banks and they appear to have been derived from local basement hi

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Dostal, Jaroslav, and J. D. Keppie. "Geochemistry of low-grade clastic rocks in the Acatlán Complex of southern Mexico: Evidence for local provenance in felsic–intermediate igneous rocks." Sedimentary Geology 222, no. 3-4 (2009): 241–53. http://dx.doi.org/10.1016/j.sedgeo.2009.09.011.

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Andjić, Goran, Peter O. Baumgartner, and Claudia Baumgartner-Mora. "Collision of the Caribbean Large Igneous Province with the Americas: Earliest evidence from the forearc of Costa Rica." GSA Bulletin 131, no. 9-10 (2019): 1555–80. http://dx.doi.org/10.1130/b35037.1.

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AbstractThe Cretaceous period was marked by the most voluminous episodes of oceanic plateau volcanism in the Phanerozoic Eon. Primarily affecting the Pacific, mantle plumes generated oceanic plateaus during three main phases (ca. 145–140 Ma, ca. 122–115 Ma, and ca. 100–90 Ma). Central America is one of the very few circum-Pacific margins where remnants of these Cretaceous plateaus were accreted. The study of their onland exposures provides a highly valuable insight into the complexity and diversity of oceanic plateau histories, from their eruption to their accretion. Exposed in northern Costa

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Valley, Peter M., Gregory J. Walsh, Arthur J. Merschat, and Ryan J. McAleer. "Geochronology of the Oliverian Plutonic Suite and the Ammonoosuc Volcanics in the Bronson Hill arc: Western New Hampshire, USA." Geosphere 16, no. 1 (2019): 229–57. http://dx.doi.org/10.1130/ges02170.1.

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Abstract U-Pb zircon geochronology by sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) on 11 plutonic rocks and two volcanic rocks from the Bronson Hill arc in western New Hampshire yielded Early to Late Ordovician ages ranging from 475 to 445 Ma. Ages from Oliverian Plutonic Suite rocks that intrude a largely mafic lower section of the Ammonoosuc Volcanics ranged from 474.8 ± 5.2 to 460.2 ± 3.4 Ma. Metamorphosed felsic volcanic rocks from within the Ammonoosuc Volcanics yielded ages of 460.1 ± 2.4 and 455.0 ± 11 Ma. Younger Oliverian Plutonic Suite rocks that either intru

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Serra-Varela, Samanta, Pablo D. González, Raúl E. Giacosa, et al. "Evolution of the Palaeozoic basement of the North Patagonian Andes in the San Martín de los Andes area (Neuquén, Argentina): petrology, age and correlations." Andean Geology 46, no. 1 (2018): 102. http://dx.doi.org/10.5027/andgeov46n1-3124.

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In San Martín de los Andes area (Argentinian Patagonia) the Palaeozoic basement consists of metamorphic and plutonic rocks. The metamorphic rocks include strongly deformed schists, gneisses and migmatites. Their geochemical and petrographic characteristics suggest that the protholith could have been a sequence of pelites and greywackes. Detrital zircon analysis (U-Pb Q-ICP-LA-MS) yielded a maximum depositional age of 501±14 Ma (Series 3 Cambrian) for this sedimentary protolith. Metasedimentary rocks are affected by a regional foliation defined by the minerals of the metamorphic peak. This is a

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Alsop, G. I., and D. H. W. Hutton. "Major southeast-directed Caledonian thrusting and folding in the Dalradian rocks of mid-Ulster: implications for Caledonian tectonics and mid-crustal shear zones." Geological Magazine 130, no. 2 (1993): 233–44. http://dx.doi.org/10.1017/s0016756800009882.

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AbstractThe dominant structure controlling the disposition of Dalradian stratigraphy in mid-Ulster has hitherto been regarded as a southeast-facing gently inclined F1 anticline, a gross geometry modelled on, and thought to be a possible correlative of, the Tay Nappe in Scotland. Remapping of the supposedly inverted southern limb of this major fold reveals that much of it is in fact the correct way up. However, a stratigraphie repetition coupled with a reversal in younging does occur in the Sperrin Mountains, much further south than previously realized. This hitherto unrecognized upward southea

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Kos'ko, M., and E. Korago. "Review of geology of the New Siberian Islands between the Laptev and the East Siberian Seas, North East Russia." Stephan Mueller Special Publication Series 4 (September 17, 2009): 45–64. http://dx.doi.org/10.5194/smsps-4-45-2009.

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Abstract. The New Siberian Islands comprise De Long Islands, Anjou Islands, and Lyakhov Islands. Early Paleozoic, Mesozoic and Cenozoic sediments and igneous rocks are known on the De Long Islands. Cambrian slate, siltstone, mudstone and silicified limestone occur on Bennett Island. Ordovician volcanogenic turbidites, lavas, and small intrusions of andesite-basalt, basalt, dolerite, and porphyritic diorite were mapped on Henrietta Island. The igneous rocks are of calc-alkaline island arc series. The Ordovician age of the sequence was defined radiometrically. Early Paleozoic strata were faulted

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Brueckner, Stefanie M., Gregory Johnson, Stephanie Wafforn, et al. "Potential for Volcanogenic Massive Sulfide Mineralization at the A6 Anomaly, North-West British Columbia, Canada: Stratigraphy, Lithogeochemistry, and Alteration Mineralogy and Chemistry." Minerals 11, no. 8 (2021): 867. http://dx.doi.org/10.3390/min11080867.

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The Middle Jurassic A6 Anomaly is located 30 km southeast of Eskay Creek, north-central British Columbia and consists of thick, altered felsic igneous rocks overlain by a mafic volcano-sedimentary package. Lithogeochemistry on igneous rocks, X-ray diffraction on altered felsic units, and electron probe microanalysis and secondary ion mass spectrometry on illite and quartz were applied to explore the volcanogenic massive sulfide (VMS) potential, characterize alteration, and determine fluid conditions at the A6 Anomaly. Lithogeochemistry revealed calc-alkaline rhyodacite to trachyte of predomina

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Holm, Paul Martin, Eva Degn Egeberg, and Niels-Ole Prægel. "Multiple syenite intrusions at Kærven, Kangerdlugssuaq, East Greenland: Evidence from the 1986 field work." Bulletin of the Geological Society of Denmark 38 (February 18, 1991): 173–81. http://dx.doi.org/10.37570/bgsd-1990-38-17.

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Tue Kærven Syenite Complex is recognized as the earliest intrusive body in the Kangerdlugssuaq region associated with the opening of the proto-Atlantic Ocean in the Lower Tertiary. Earlier investigations of the geology of the Kærven Syenite Complex have interpreted the intrusion as a single igneous body, emplaced subsequent to the Kærven Gabbro and in turn cut by the Kangerdlugssuaq intrusion. Preliminary sampling on Kærven in 1977 revealed a relatively large range of rock types in the complex (syenite - alkali feldspar syenite - alkali feldspar granite). Tue field work conducted in 1986 has v

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Santos Polo, Alan, Guo Weimin, Fernando Rivera, Colombo Tassinari, Luis Cerpa, and Shoji Kojima. "Early Jurassic arc related magmatism associated with porphyry copper mineralization at Zafranal, Southern Peru unraveled by zircon U-Pb ages." Andean Geology 46, no. 3 (2019): 445. http://dx.doi.org/10.5027/andgeov46n3-3041.

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Early Jurassic arc-related igneous rocks host porphyry copper prospects and gold-bearing quartz vein deposits in southern Peru. Ten new zircon U-Pb ages for wall rocks of gold-bearing quartz veins, Jurassic rocks and copper-mineralized porphyry bodies in Zafranal porphyry copper, together with published ages for Jurassic rocks, reveal a continuous magmatic evolution of the early Jurassic arc. The Jurassic rocks and gold-bearing quartz vein systems in the western flank of the Western Cordillera are hosted by Paleo- and Meso-proterozoic orthogneisses of the Arequipa Massif (1.75-1.44 Ga) that un

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Parra, Luis Miguel Martín, Francisco González Lodeiro, David Martínez Poyatos, and Jerónimo Matas. "The Puente Génave-Castelo de Vide shear zone (southern Central Iberian Zone, Iberian Massif): geometry, kinematics and regional implications." Bulletin de la Société Géologique de France 177, no. 4 (2006): 191–202. http://dx.doi.org/10.2113/gssgfbull.177.4.191.

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Abstract This paper is concerned with the existence and the salient characteristics of an extensional shear zone (the Puente Génave-Castelo de Vide shear zone) along 400 km in the southern Central Iberian Zone. This shear zone is almost parallel to the previous Variscan structures, but it is slightly cross-cut by the discontinuous late Carboniferous Alburquerque-Pedroches batholithic alignment (which has been considered by some authors to be a fundamental feature for the sub-zonation of the Iberian Massif). The shear zone dips towards the S or SW, showing a top-to-the-S sense of movement. Ear

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Mikheeva, Ekaterina A., Elena I. Demonterova, and Alexei V. Ivanov. "Geochemistry of the Cheremkhovo and Lower Prisayan Formations from the Jurassic Irkutsk Coal-Bearing Basin: Evidence for Provenance and Climate Change in Pliensbachian–Toarcian." Minerals 11, no. 4 (2021): 357. http://dx.doi.org/10.3390/min11040357.

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The Cheremkhovo formation (Pliensbachian) is the primary coal-bearing formation of the Irkutsk basin, Eastern Siberia. Still, few geochemical studies of the Jurassic sediments of the Irkutsk coal-bearing basin have been conducted, and there are no data on the geochemistry of the coal-bearing formation itself. This study presents geochemical data for 68 samples from the Cheremkhovo formation and the overlying Lower Prisayan formation. The age of the former has been estimated by U-Pb dating of zircon from a tonstein (altered volcanic ash) layer as Pliensbachian, whereas the age of the latter is

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Milici, Robert, and C. Hobbs. "William Barton Rogers and the First Geological Survey of Virginia, 1835 - 1841." Earth Sciences History 6, no. 1 (1987): 3–13. http://dx.doi.org/10.17704/eshi.6.1.h913334r26963621.

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Virginia was the fifth state in the United States to establish a geological survey. Support for this bold venture to develop the state's mineral wealth came from the Geological Society of Pennsylvania, several prominent Virginia citizens, and county legislators. On March 6, 1835 the General Assembly passed an act to authorize a geological reconnaissance. Shortly thereafter William Barton Rogers was appointed to direct the survey, as well as being elected to the chair of natural philosophy at the University of Virginia in Charlottesville. Within a nine-month period he prepared a report on limes

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Pinto, Luisa, Gérard Hérail, Bernard Moine, François Fontan, Reynaldo Charrier, and Bernard Dupré. "Using geochemistry to establish the igneous provenances of the Neogene continental sedimentary rocks in the Central Depression and Altiplano, Central Andes." Sedimentary Geology 166, no. 1-2 (2004): 157–83. http://dx.doi.org/10.1016/j.sedgeo.2003.12.002.

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Barnes, Calvin G., and Melanie A. Barnes. "The western Hayfork terrane: Remnants of the Middle Jurassic arc in the Klamath Mountain province, California and Oregon." Geosphere 16, no. 4 (2020): 1058–81. http://dx.doi.org/10.1130/ges02229.1.

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Abstract Arc magmatism was widespread in the Cordillera of North America during Middle Jurassic time. The predominant representative of this arc magmatism in the Klamath Mountain province is the western Hayfork terrane (WHT). This terrane is primarily metasedimentary, consisting mainly of crystal-lithic arenite, argillitic sediments and lahar deposits, rare lavas, and sparse quartz-rich arenite. Because lavas are rare, petrologic study using bulk-rock compositions is restricted to analysis of cobbles in lahar deposits. Moreover, the WHT underwent greenschist-facies regional metamorphism with c

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Barr, Sandra M., Susan C. Johnson, Greg R. Dunning, et al. "New Cryogenian, Neoproterozoic, and middle Paleozoic U–Pb zircon ages from the Caledonia terrane, southern New Brunswick, Canada: better constrained but more complex volcanic stratigraphy." Atlantic Geology 56 (July 9, 2020): 163–87. http://dx.doi.org/10.4138/atlgeol.2020.007.

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New U–Pb zircon ages from volcanic, plutonic, and sedimentary units in the Avalonian Caledonia terrane of southern New Brunswick provide better timing constraints in this geologically complex area. Previous ca. 620 Ma ages from the Broad River Group are now corroborated by additional dates from felsic tuff in the Gordon Falls Formation and rhyolite in the former Fairfield (now East Branch Black River) Formation of 620 ± 5 Ma and 622 ± 1.9 Ma, respectively. Combined with ages ranging from ca. 625 Ma to 615 Ma from crosscutting plutons, the data suggest that the minimum age of the Broad River Gr

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Arzamastsev, A. A., S. V. Egorova, K. G. Erofeeva, et al. "Paleoproterozoic (2.51–2.40 Ga) Igneous Provinces of the Northeastern Fennoscandia: Geochemistry of Volcanic Rocks and Correlation with Intrusive Complexes." Stratigraphy and Geological Correlation 28, no. 6 (2020): 603–29. http://dx.doi.org/10.1134/s0869593820060039.

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Watson, Douglas, Simon Holford, Nick Schofield, and Niall Mark. "Failure to predict igneous rocks encountered during exploration of sedimentary basins: A case study of the Bass Basin, Southeastern Australia." Marine and Petroleum Geology 99 (January 2019): 526–47. http://dx.doi.org/10.1016/j.marpetgeo.2018.10.034.

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Perron, Gervais, and Andrew J. Calvert. "Shallow, high‐resolution seismic imaging at the Ansil mining camp in the Abitibi greenstone belt." GEOPHYSICS 63, no. 2 (1998): 379–91. http://dx.doi.org/10.1190/1.1444337.

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Volcanic rocks in, and around, the Ansil mining camp host a large number of massive sulfide mineral deposits. A high‐resolution seismic reflection profile was shot across the camp with the objective of mapping the contacts between the different volcanic units at which most of the ore bodies have been found. Numerous exploration boreholes define the geology to a depth of 1600 m and allow a precise comparison with the recorded reflections. Geophysical logs obtained in one deep borehole suggest that reflection coefficients between the andesite‐rhyolite units of the volcanic stratigraphy are aroun

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Yao, Weijiang, Zhonghong Chen, Xuemei Dong, et al. "Storage space, pore–throat structure of igneous rocks and the significance to petroleum accumulation: An example from Junggar Basin, western China." Marine and Petroleum Geology 133 (November 2021): 105270. http://dx.doi.org/10.1016/j.marpetgeo.2021.105270.

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LARSEN, LOTTE M., ASGER K. PEDERSEN, CHRISTIAN TEGNER, ROBERT A. DUNCAN, NIELS HALD, and JØRGEN G. LARSEN. "Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province." Geological Magazine 153, no. 3 (2015): 487–511. http://dx.doi.org/10.1017/s0016756815000515.

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AbstractRadiometric ages for undated parts of the volcanic succession and intrusions in West Greenland were obtained by the40Ar–39Ar incremental heating method. Acceptable crystallization ages were obtained for 27 samples. Combined with published results the new data provide a volcanic stratigraphy correlatable throughout the Nuussuaq Basin. The thick onshore volcanic pile consists of four widespread formations: 62.5–61 Ma picrites (Vaigat Formation), 61–60 Ma depleted basalts (Maligât Formation and the Hellefisk-1 well), 60–58 Ma less-depleted basalts (Svartenhuk Formation) and 56–54 Ma enric

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Fu, Dong, Timothy M. Kusky, Simon A. Wilde, et al. "Structural anatomy of the early Paleozoic Laohushan ophiolite and subduction complex: Implications for accretionary tectonics of the Proto-Tethyan North Qilian orogenic belt, northeastern Tibet." GSA Bulletin 132, no. 9-10 (2020): 2175–201. http://dx.doi.org/10.1130/b35442.1.

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Abstract Recognition of accretionary tectonics in ancient orogenic collages is important for reconstructing the long-term subduction, accretion, and erosional history of fossil convergent margins, and for understanding crustal growth and supercontinent assembly. The North Qilian orogenic belt (NQOB), located between the Alxa block and the Central Qilian–Qaidam block in northeastern Tibet, is a typical Phanerozoic accretionary-to-collisional orogenic belt that represents the termination of the northern branch of the Proto-Tethys Ocean. It contains two subparallel ophiolitic belts, arcs, and sub

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Coetzee, A., and A. F. M. Kisters. "Spatial variations of sills and implications for magma dispersal across the Karoo basin." South African Journal of Geology 123, no. 4 (2020): 511–30. http://dx.doi.org/10.25131/sajg.123.0035.

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Abstract Dolerite sill complexes of the Karoo Large Igneous Province (ca. 183 Ma) show systematic variations in emplacement style and size throughout the Karoo basin. These variations are explained in terms of three main, interrelated factors, namely the overburden thickness or emplacement depth, variations in host rock rigidities as a result of sedimentary facies changes in the Karoo basin, and proximity to magma feeders. In the northern parts of the thinner (&lt;500 m) and more coarse-clastic Karoo stratigraphy, sills intrude preferentially below more rigid sandstone horizons that acted

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Fasulo, Cooper R., and Kenneth D. Ridgway. "Detrital zircon geochronology of modern river sediment in south-central Alaska: Provenance, magmatic, and tectonic insights into the Mesozoic and Cenozoic development of the southern Alaska convergent margin." Geosphere 17, no. 4 (2021): 1248–67. http://dx.doi.org/10.1130/ges02270.1.

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Abstract New and previously published detrital zircon U-Pb ages from sediment in major rivers of south-central Alaska archive several major episodes of magmatism associated with the tectonic growth of this convergent margin. Analysis of detrital zircons from major trunk rivers of the Tanana, Matanuska-Susitna, and Copper River watersheds (N = 40, n = 4870) documents major &lt;250 Ma age populations that are characteristic of the main phases of Mesozoic and Paleogene magmatism in the region as documented from limited U-Pb ages of igneous rocks. Key points from our detrital record include: (

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Powerman, Vladislav, Richard Hanson, Anna Nosova, Gary H. Girty, Jeremy Hourigan, and Andrei Tretiakov. "Nature and timing of Late Devonian–early Mississippian island-arc magmatism in the Northern Sierra terrane and implications for regional Paleozoic plate tectonics." Geosphere 16, no. 1 (2019): 258–80. http://dx.doi.org/10.1130/ges02105.1.

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Abstract The Northern Sierra terrane is one of a series of Paleozoic terranes outboard of the western Laurentian margin that contain lithotectonic elements generally considered to have originated in settings far removed from their present relative locations. The Lower to Middle Paleozoic Shoo Fly Complex makes up the oldest rocks in the terrane and consists partly of thrust-imbricated deep-marine sedimentary strata having detrital zircon age signatures consistent with derivation from the northwestern Laurentian margin. The thrust package is structurally overlain by the Sierra City mélange, whi

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Francaviglia, Richard. "On the Margins of Science and Civilization: W. K. Gordon's 1895 Geological Reconnaissance in the Trans-Pecos Borderlands." Earth Sciences History 27, no. 1 (2008): 113–30. http://dx.doi.org/10.17704/eshi.27.1.p456t258862533w9.

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In 1895, self-trained mining engineer William K. Gordon, Sr (1862-1949) conducted a geological reconnaissance trip to far West Texas in search of coal deposits. A report from that trip reveals how Gordon's training in geology (acquired largely through reading) and his intrinsic interest in stratigraphy and geomorphology helped him effectively advise the Texas and Pacific Coal Company about the bleak prospects there. In 2005, using Gordon's never-before consulted field report, the author retraced, or rather re-hiked, Gordon's route. Gordon's report features hand-drawn maps and a geological cros

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Larsen, Lotte Melchior, Erik Vest Sørensen, W. Stuart Watt, Asger Ken Pedersen, and Robert A. Duncan. "Stratigraphy and age of the Eocene Igtertivâ Formation basalts, alkaline pebbles and sediments of the Kap Dalton Group in the graben at Kap Dalton, East Greenland." Bulletin of the Geological Society of Denmark 61 (August 1, 2013): 1–18. http://dx.doi.org/10.37570/bgsd-2013-61-01.

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A NE–SW-trending graben at Kap Dalton on the Blosseville Kyst contains an at least 600 m thick succession of Eocene basalt lavas and sediments. The succession has been investigated by new field work, geochemical analysis and radiometric dating by the 40Ar-39Ar incremental heating method. The results show that the volcanic succession comprises about 220 m of the uppermost plateau basalt formation, the Skrænterne Formation. This is separated from the overlying lava flows of the Igtertivâ Formation by 7 m of sediments that represent a period of around six million years. The two formations can be

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Carpenter, Chris. "Reservoir Characterization, Scenario-Based Models Optimize Development Planning." Journal of Petroleum Technology 73, no. 07 (2021): 48–49. http://dx.doi.org/10.2118/0721-0048-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202273, “Reservoir Characterization and Scenario-Based Modeling To Optimize Development Planning of the Jurassic Plover Formation in the Ichthys Field, North West Shelf of Australia,” by Kazuyuki Yamamoto, SPE, Shuji Yamamoto, and Toby Jones, INPEX, et al., prepared for the 2020 SPE Asia Pacific Oil and Gas Conference and Exhibition, originally scheduled to be held in Perth, Australia, 20–22 October. The paper has not been peer reviewed. The Plover Formation is one of two reservoirs in the Ichthys

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