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Artigos de revistas sobre o tema "Stratigraphic Proterozoic"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de janeiro de 2023

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1

Wu, He Yuan, and Bin Hao. "Third-Order Sequence Division of Yunmengshan and Baicaoping Formation of Proterozoic in Yuxi District of China: an Example from Xiatang Profile in Lushan." Advanced Materials Research 998-999 (July 2014): 1492–97. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.1492.

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There are controversies on the Proterozoic stratigraphic genesis, division, correlation and palaeogeographical evolution of western Henan in China. Based on the basic description of sedimentary facies, Yunmengshan and Baicaoping formation of Proterozoic typical section in western Henan is divided into 4 third-order sequences. Sequence stratigraphy framework which reflects sedimentary and overlap is established with basis of two kinds of facies-change surface and two kinds of diachrononism in stratigraphical records. Although chronostratigraphic belonging of Precambrian strata is controversial

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2

Halverson, Galen P., Susannah M. Porter, and Timothy M. Gibson. "Dating the late Proterozoic stratigraphic record." Emerging Topics in Life Sciences 2, no. 2 (July 13, 2018): 137–47. http://dx.doi.org/10.1042/etls20170167.

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The Tonian and Cryogenian periods (ca. 1000–635.5 Ma) witnessed important biological and climatic events, including diversification of eukaryotes, the rise of algae as primary producers, the origin of Metazoa, and a pair of Snowball Earth glaciations. The Tonian and Cryogenian will also be the next periods in the geological time scale to be formally defined. Time-calibrating this interval is essential for properly ordering and interpreting these events and establishing and testing hypotheses for paleoenvironmental change. Here, we briefly review the methods by which the Proterozoic time scale

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3

Sergeeva, Nina Dmitrievna, and Viktor Nikolaevich Puchkov. "REGIONAL STRATIGRAPHIC SCHEME OF THE UPPER AND FINAL RIPHEAN AND VENDIAN DEPOSITS OF THE SOUTHERN URALS (PROJECT 2022)." Geologicheskii vestnik, no. 2 (July 14, 2022): 3–14. http://dx.doi.org/10.31084/2619-0087/2022-2-1.

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The need to correct individual stratigraphic levels of the Regional Stratigraphic Scheme of the Upper Precambrian deposits of the Urals, existing since 1993, is due to the receipt of new data from lithological-stratigraphic, geotectonic and isotope-geochronological studies of the Upper Precambrian of the Southern Urals. Significant changes and clarifications in the stratigraphy of the Upper Precambrian formations of the region occurred in the Upper Riphean and Vendian of the Bashkir meganticlinorium in the Southern Urals, where the sections stratotypical for the Riphean and reference for the V

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Roscoe, S. M., and K. D. Card. "The reappearance of the Huronian in Wyoming: rifting and drifting of ancient continents." Canadian Journal of Earth Sciences 30, no. 12 (December 1, 1993): 2475–80. http://dx.doi.org/10.1139/e93-214.

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Striking stratigraphic and sedimentological similarities between the Early Proterozoic Huronian Supergroup of the Canadian Shield and the Snowy Pass Supergroup of Wyoming suggest that they were deposited in a single, broad, epicratonic basin developed atop a large Archean continent that included the Superior and Wyoming geological provinces. Breakup of the continent after the 2.2 Ga intrusion of widespread gabbro sheets and dykes resulted in the separation of the Archean Superior and Wyoming cratons and their Early Proterozoic covers. These crustal fragments were subsequently reassembled durin

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5

Martins-Neto, Marcelo A. "Sequence stratigraphic framework of Proterozoic successions in eastern Brazil." Marine and Petroleum Geology 26, no. 2 (February 2009): 163–76. http://dx.doi.org/10.1016/j.marpetgeo.2007.10.001.

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6

Phillips, Bruce J., Alan W. James, and Graeme M. Philip. "THE GEOLOGY AND HYDROCARBON POTENTIAL OF THE NORTH-WESTERN OFFICER BASIN." APPEA Journal 25, no. 1 (1985): 52. http://dx.doi.org/10.1071/aj84004.

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Recent petroleum exploration in EP 186 and EP 187 in the north-western Officer Basin has greatly increased knowledge of the regional stratigraphy, structure and petroleum prospectivity of the region. This exploration programme has involved the drilling of two deep stratigraphic wells (Dragoon 1 and Hussar 1) and the acquisition of 1438 km of seismic data. Integration of regional gravity and aeromagnetic data with regional seismic and well data reveals that the Gibson Sub-basin primarily contains a Proterozoic evaporitic sequence. In contrast, the Herbert Sub-basin contains a Late Proterozoic t

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7

Cook, Frederick A., and Samantha M. Siegel. "From Proterozoic strata to a synthesized seismic reflection trace: implications for regional seismic reflection patterns in northwestern Canada." Canadian Journal of Earth Sciences 43, no. 11 (November 1, 2006): 1639–51. http://dx.doi.org/10.1139/e06-040.

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Calculation of a synthetic seismic reflection trace from detailed descriptions of exposed Proterozoic strata in northwestern Canada permits correlation of reflections on regional seismic profiles to surface outcrop. Approximately 5.4 km (composite thickness) of Paleo- and Mesoproterozoic strata are exposed in the Muskwa anticlinorium that is located within the foreland of the Cordillera in northeastern British Columbia. The Tuchodi anticline is the easternmost structure of the Muskwa anticlinorium and has the deepest levels of Proterozoic strata exposed. At this location, prominent seismic ref

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8

Dub, S. A. "Upper Precambrian General Stratigraphic Scale of Russia: Main problems and proposals for improvement." LITHOSPHERE (Russia) 21, no. 4 (August 28, 2021): 449–68. http://dx.doi.org/10.24930/1681-9004-2021-21-4-449-468.

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Research subject. Main problems of the General Stratigraphic Scale (GSS) of the Upper Precambrian including uncertainties in the hierarchy of subdivisions are analyzed.Results. Prospects for detailing the Upper Precambrian GSS are discussed, along with questions of its correlation with International Chronostratigraphic Chart (ICSC) and establishing the lower boundaries of chronostratigraphic subdivisions. The importance of unifying the existing views is emphasized.Conclusions. It is proposed to carry out the following reforms of GSS: to abolish Acrothemes / Acrons; to approve the Proterozoic (

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9

Hiatt, Eric E., T. Kurtis Kyser, Paul A. Polito, Jim Marlatt, and Peir Pufahl. "The Paleoproterozoic Kombolgie Subgroup (1.8 Ga), McArthur Basin, Australia: Sequence stratigraphy, basin evolution, and unconformity-related uranium deposits following the Great Oxidation Event." Canadian Mineralogist 59, no. 5 (September 1, 2021): 1049–83. http://dx.doi.org/10.3749/canmin.2000102.

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ABSTRACT Proterozoic continental sedimentary basins contain a unique record of the evolving Earth in their sedimentology and stratigraphy and in the large-scale, redox-sensitive mineral deposits they host. The Paleoproterozoic (Stratherian) Kombolgie Basin, located on the Arnhem Land Plateau, Northern Territory, is an exceptionally well preserved, early part of the larger McArthur Basin in northern Australia. This intracratonic basin is filled with 1 to 2 km-thick, relatively undeformed, nearly flat-lying, siliciclastic rocks of the Kombolgie Subgroup. Numerous drill cores and outcrop exposure

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10

Ansdell, Kevin M., T. Kurtis Kyser, Mel R. Stauffer, and Garth Edwards. "Age and source of detrital zircons from the Missi Formation: a Proterozoic molasse deposit, Trans-Hudson Orogen, Canada." Canadian Journal of Earth Sciences 29, no. 12 (December 1, 1992): 2583–94. http://dx.doi.org/10.1139/e92-205.

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The Missi Formation in the Flin Flon Basin forms part of a discontinuous series of molasse-type sediments found throughout the Early Proterozoic Trans-Hudson Orogen in northern Saskatchewan and Manitoba. The Flin Flon Basin contains a sequence of proximal-fan to braided-stream fluvial conglomerates and sandstones, which unconformably overlie subaerially weathered Amisk Group volcanic rocks. Stratigraphic way-up indicators have been preserved, even though these rocks have undergone greenschist-facies metamorphism and polyphase deformation. The sedimentary rocks are crosscut by intrusive rocks,

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11

Cosgrove, G. I. E., L. Colombera, and N. P. Mountney. "Eolian stratigraphic record of environmental change through geological time." Geology 50, no. 3 (November 22, 2021): 289–94. http://dx.doi.org/10.1130/g49474.1.

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Abstract The terrestrial sedimentary record provides a valuable archive of how ancient depositional systems responded to and recorded changes in Earth's atmosphere, biosphere, and geosphere. However, the record of these environmental changes in eolian sedimentary successions is poorly constrained and largely unquantified. Our study presents the first global-scale, quantitative investigation of the architecture of eolian systems through geological time via analysis of 55 case studies of eolian successions. Eolian deposits accumulating (1) under greenhouse conditions, (2) in the presence of vasc

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12

Mitchelmore, Marlene Dredge, and Frederick A. Cook. "Inversion of the Proterozoic Wernecke basin during tectonic development of the Racklan Orogen, northwest Canada." Canadian Journal of Earth Sciences 31, no. 3 (March 1, 1994): 447–57. http://dx.doi.org/10.1139/e94-041.

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New deep seismic reflection data coupled with regional stratigraphic correlations, drill-hole information, and potential field data are interpreted to provide images of Middle Proterozoic Wernecke Supergroup (meta-)sedimentary layers that were uplifted during tectonic development of the ca. 0.9–1.3 Ga Racklan Orogen in Canada's western Northwest Territories. The reflection data are located at the eastern front of the Mackenzie Mountains portion of the Canadian Cordillera and on the western flank of the Fort Simpson structural trend that is a prominent Proterozoic structure in the subsurface th

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13

Ming, Yan, Liu Yingjun, and Ma Dongsheng. "Stratigraphic geochemistry of Upper-Middle Proterozoic Suberathem in northern Guangxi, China." Chinese Journal of Geochemistry 14, no. 3 (July 1995): 231–42. http://dx.doi.org/10.1007/bf02842046.

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14

Bailey, A. H. E., E. Grosjean, L. Wang, C. J. Boreham, G. A. Butcher, C. J. Carson, A. J. M. Jarrett, et al. "Resource potential of the Carrara Sub-basin from the deep stratigraphic well NDI Carrara 1." APPEA Journal 62, no. 2 (May 13, 2022): S378—S384. http://dx.doi.org/10.1071/aj21075.

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NDI Carrara 1 is a deep stratigraphic well completed in 2020 as part of the MinEx CRC National Drilling Initiative (NDI), in collaboration with Geoscience Australia and the Northern Territory Geological Survey. It is the first stratigraphic test of the Carrara Sub-basin, a newly discovered depocentre in the South Nicholson Region. The well intersected Proterozoic sediments with numerous hydrocarbon shows, likely to be of particular interest due to affinities with the known Proterozoic plays of the Beetaloo Sub-basin and the Lawn Hill Platform, including two organic-rich black shales and a thic

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15

Alsop, G. I. "The geometry and structural evolution of a crustal-scale Caledonian fold complex: the Ballybofey Nappe, northwest Ireland." Geological Magazine 131, no. 4 (July 1994): 519–37. http://dx.doi.org/10.1017/s0016756800012139.

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AbstractThe gross geometries exhibited by crustal-scale fold nappes are considered a consequence of both original stratigraphic relationships associated with sub-basin configuration, coupled with the nature of the structural regime and tectonic processes involved in the generation of the nappe pile. The Neo-Proterozoic Dalradian metasediments of northwestern Ireland provide a well-constrained and correlatable stratigraphy which defines a sequence of sub-reclined, tight-isoclinal Caledonian (c. 460 Ma) fold nappes. Within this fold complex, the dominant structure is the crustal-scale Ballybofey

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16

Kulikov, V. S., V. V. Kulikova, and A. K. Polin. "NEW CHRONOSTRATIC SCHEME OF SOUTH-EASTERN FENNOSCANDIA AND ITS USE IN THE PREPARATION OF SMALL-SCALE GEOLOGICAL MAPS OF THE PRECAMBRIAN REGIONS." Proceedings of higher educational establishments. Geology and Exploration, no. 5 (October 28, 2017): 5–12. http://dx.doi.org/10.32454/0016-7762-2017-5-5-12.

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A new chronostratic scheme of South-East (SE) Fennoscandia has been developed, based on the International Stratigraphie Scale, taking into account some elements of the Common Stratigraphic Scale of Russia and the regional stratigraphic scheme of the North-West (NW) of Russian Federation. A rank of Archean and Proterozoic stratons has been determined (including supersystems for Riphean and Archean geonotems), compatable in dutation to the Phanerozoic systems (Mesozoic and Paleozoic ones). An original coloring for the geological maps of the newly allocated systems and their analogues in the Prec

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17

Marian, Melinda L., and Robert H. Osborne. "Petrology, petrochemistry, and stromatolites of the Middle to Late Proterozoic Beck Spring Dolomite, eastern Mojave Desert, California." Canadian Journal of Earth Sciences 29, no. 12 (December 1, 1992): 2595–609. http://dx.doi.org/10.1139/e92-206.

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The Beck Spring Dolomite is the medial unit of the Middle to Late Proterozoic Pahrump Group, the oldest sequence of sedimentary rocks in eastern California. Stratigraphic sections of the Beck Spring Dolomite examined in the eastern Mojave Desert and Death Valley regions consist of four members. These are, in ascending order, a lower cherty member, a lower laminated member, an oolitic–pisolitic member, and an upper cherty member. More than 80% of the Beck Spring Dolomite is algal-laminated dolomite with a possible Middle to Late Riphean stromatolite assemblage characterized by cf. Conophyton, e

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18

GEHLING, JAMES G., SÖREN JENSEN, MARY L. DROSER, PAUL M. MYROW, and GUY M. NARBONNE. "Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland." Geological Magazine 138, no. 2 (March 2001): 213–18. http://dx.doi.org/10.1017/s001675680100509x.

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The range of Treptichnus pedum, the index trace fossil for the Treptichnus pedum Zone, extends some 4 m below the Global Standard Stratotype-section and Point for the base of the Cambrian Period at Fortune Head on the Burin Peninsula in southeastern Newfoundland. The identification of zigzag traces of Treptichnus isp., even further below the GSSP than T. pedum in the Fortune Head section, and in other terminal Proterozoic successions around the globe, supports the concept of a gradational onset of three-dimensional burrowing across the Proterozoic–Cambrian boundary. Although T. pedum remains a

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19

Sevigny, James H., Frederick A. Cook, and Elizabeth A. Clark. "Geochemical signature and seismic stratigraphic setting of Coppermine basalts drilled beneath the Anderson Plains in northwest Canada." Canadian Journal of Earth Sciences 28, no. 2 (February 1, 1991): 184–94. http://dx.doi.org/10.1139/e91-018.

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Basalts drilled in the Petro-Canada – Canterra Tweed Lake M-47 well in the Anderson Plains of northwestern Canada have geochemical characteristics, including of major, trace, and rare earth elements, that are similar to those of the most enriched Coppermine lavas but significantly different from those of the younger Proterozoic volcanics, such as the Natkusiak basalts. This result provides a geological tie and timing constraint for structures observed on seismic reflection data in this area. Correlation of stratigraphic data from the well to seismic data shows that the lavas are within a seque

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20

Carevic, Ivana, Miroljub Milincic, and Velimir Jovanovic. "Contribution to the study of geological setting of lower Aleksandrovac Zupa." Glasnik Srpskog geografskog drustva 89, no. 3 (2009): 135–46. http://dx.doi.org/10.2298/gsgd0903135c.

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Aleksandrovac Zupa represents the example of territorial area with composite geological structure and furthermore compound geotectonic framework. Due to the character of some formations, framework and time relation of deformation, these areas belong among the most compound on the Balkan Peninsula. On its territory, the big and composite structural-facies zones are being confronted and became imbued. In a stratigraphic point of view, the largest extend have the Miocene deposits that overlain the crystalline schists of Proterozoic. .

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Konstantinova, Larisa N., Igor A. Gubin, Sergey A. Moiseev, Andrey M. Fomin, and Elena N. Kuznetsova. "CORRELATION RESULTS OF THE PROTEROZOIC-PHANEROZOIC SECTIONS OF THE ALDAN-MAYA OIL AND GAS BEARING REGION ON DEEP DRILLING DATA." Interexpo GEO-Siberia 2, no. 1 (May 21, 2021): 102–10. http://dx.doi.org/10.33764/2618-981x-2021-2-1-102-110.

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The article discusses the controversial issues of well log correlation of the Riphean, Vendian, Cambrian and Mesozoic sequences, which is prospects for oil and gas within the Aldan-Maya petroleum region. The author's version of the stratigraphic correlation is based on the interpretation of logging data, seismic surveys, core description, archival and published materials. The results obtained can be used for stratigraphic picks correction and structural maps plotting.

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Skuf’in, P. K. "SOME PROBLEMS GEOCHEMISTRY OF VOLCANITES OF THE PECHENGA STRUCTURE (KOLA PENINSULA)." Globus 7, no. 2(59) (April 4, 2021): 11–14. http://dx.doi.org/10.52013/10.52013/2658-5197-59-2-2.

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Some problems of dating the most important stratigraphic units of the Early Proterozoic Pechenga Structure are considered. The structure is composed of rocks of the Pechenga Complex, which in turn is divided into well-studied formations of the North-Pechenga subcomplex and poorly studied formations – the South-Pechenga subcomplex. This structure is one of the most studied Early Precambrian structures in the world. Volcanites of the Pechenga Structure have been studied for nearly half a century. However, many determinations of the isotopic ages of reference levels of geological crossection were

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Birkenmajer, Krzysztof. "Polish Geological Research in Svalbard." Earth Sciences History 11, no. 2 (January 1, 1992): 81–87. http://dx.doi.org/10.17704/eshi.11.2.n2747185001nv261.

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The Polish geological investigations started in the Svalbard archipelago in 1934. The most diversified stratigraphic, tectonic, sedimentological and palacontological work, along with detailed geological mapping, was carried out in the Hornsund area, south Spitsbergen, between 1957 and 1960, in connection with the Illrd International Geophysical Year and its prolongation (International Geophysical Co-operation). Between 1962 and 1970, some Polish geologists worked in Spitsbergen for the Norwegian Polar Institute. From 1974 onwards, the Polish geological investigations extended from southern to

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24

Kyrylyuk, V. P., and O. V. Gaiovskyi. "REGIONAL METAMORPHISM AND STRATIGRAPHY OF THE BASEMENT OF UKRAINIAN SHIELD." Geological Journal, no. 4 (December 28, 2022): 3–30. http://dx.doi.org/10.30836/igs.1025-6814.2022.4.261979.

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Stratigraphic complexes of the Lower Precambrian are everywhere metamorphosed. That is why the stratigraphic dismemberment of the Lower Precambrian has always been inextricably linked with the study of metamorphism. For some time, metamorphism was even used as a sign of the relative age of stratigenic metamorphic complexes according to the principle – “the higher the degree of metamorphism, the older the complex”. The high-temperature complexes of granulite and amphibolite facies belonged to the Archean, while the less metamorphosed complexes belonged to the Proterozoic. But already at the beg

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Gibson, Gail G. "Trace fossils from Late Precambrian Carolina slate belt, south-central North Carolina." Journal of Paleontology 63, no. 1 (January 1989): 1–10. http://dx.doi.org/10.1017/s0022336000040889.

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The volcanosedimentary sequence of the Carolina slate belt in south-central North Carolina was long thought to be unfossiliferous; however, the 5,484–7,315 meters of dominantly evenly bedded siltstones and mudstones have recently yielded body fossils of the late Precambrian Ediacarian fauna and a Middle Cambrian trilobite assemblage. Ongoing stratigraphic studies in the Carolina slate belt of southern North Carolina have now revealed trace fossils representing the ichnotaxa Gordia arcuata?, ?Helminthopsis sp., Monocraterion sp., Neonerites biserialis, N. uniserialis, ?Neonerites sp., Planolite

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McDonough, Michael R., and Randall R. Parrish. "Proterozoic gneisses of the Malton Complex, near Valemount, British Columbia: U–Pb ages and Nd isotopic signatures." Canadian Journal of Earth Sciences 28, no. 8 (August 1, 1991): 1202–16. http://dx.doi.org/10.1139/e91-108.

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Proterozoic gneisses of the Malton Complex in the vicinity of Valemount, British Columbia, occur in a series of lithologically and structurally complex, fault-bounded slices of crystalline basement and interleaved cover. Gneisses of the Malton Complex span the Southern Rocky Mountain Trench and underlie the western part of the Rocky Mountain fold and thrust belt and the eastern part of the Omineca Belt of the Canadian Cordillera. Structural and stratigraphic relationships indicate that they formed the basement upon which an enigmatic quartzite unit and the Late Proterozoic Windermere Supergrou

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GEYER, G. "The Fish River Subgroup in Namibia: stratigraphy, depositional environments and the Proterozoic–Cambrian boundary problem revisited." Geological Magazine 142, no. 5 (September 2005): 465–98. http://dx.doi.org/10.1017/s0016756805000956.

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The Fish River Subgroup of the Nama Group, southern Namibia, is restudied in terms of lithostratigraphy and depositional environment. The study is based on partly fine-scaled sections, particularly of the Nababis and Gross Aub Formation. The results are generally in accordance with earlier studies. However, braided river deposits appear to be less widely distributed in the studied area, and a considerable part of the formations of the middle and upper subgroup apparently were deposited under shallowest marine conditions including upper shore-face. Evidence comes partly from sedimentary feature

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Jansa, L. F., G. Pe-Piper, and B. D. Loncarevic. "Appalachian basement and its intrusion by Cretaceous dykes, offshore southeast Nova Scotia, Canada." Canadian Journal of Earth Sciences 30, no. 12 (December 1, 1993): 2495–509. http://dx.doi.org/10.1139/e93-216.

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Aeromagnetic data collected between eastern Nova Scotia and southern Newfoundland provide new information about the offshore extension of the Avalon and Meguma terranes. A zone of short-wavelength anomalies that delineates Scatarie Ridge extends westward to the Late Proterozoic Fourchu Group in southeastern Cape Breton Island and eastward towards the Burin Peninsula of Newfoundland, suggesting that both regions belong to the same tectono-stratigraphic province of the Avalon composite terrane. A different zone of short-wavelength, discontinuously lineated anomalies at the northern edge of the C

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Myrow, P. M., N. C. Hughes, and N. R. McKenzie. "Reconstructing the Himalayan margin prior to collision with Asia: Proterozoic and lower Paleozoic geology and its implications for Cenozoic tectonics." Geological Society, London, Special Publications 483, no. 1 (November 21, 2018): 39–64. http://dx.doi.org/10.1144/sp483.10.

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AbstractReconstructing the stratigraphic architecture of deposits prior to Cenozoic Himalayan uplift is critical for unravelling the structural, metamorphic, depositional and erosional history of the orogen. The nature and distribution of Proterozoic and lower Paleozoic strata have helped elucidate the relationship between lithotectonic zones, as well as the geometries of major bounding faults. Stratigraphic and geochronological work has revealed a uniform and widespread pattern of Paleoproterozoic strata >1.6 Ga that are unconformably overlain by <1.1 Ga rocks. The overlying Neoproteroz

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Alvan, Aldo A., Yacory F. Bustamante, Elvis A. Sánchez, and Mirian I. Mamani. "Arquitectura estratigráfica, paleogeografía y proveniencia sedimentaria de las rocas cenozoicas del sur de Perú (Tacna, 18° S)." Andean Geology 47, no. 2 (May 29, 2020): 351. http://dx.doi.org/10.5027/andgeov47n2-3168.

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The Cenozoic rocks lying in the Province of Tacna (18° S), southern Perú, represent approximately 600 m of stratigraphic thickness. This stacking groups the Sotillo (Paleocene), Moquegua Inferior (Eocene), Moquegua Superior (Oligocene), Huaylillas (Miocene) and Millo formations (Pliocene), and these are the sedimentary fill of the Moquegua Basin. The sediments of the three latter formations are organized into nine sedimentary facies and five architectural elements. Their facies associations suggest the existence of an ancient highly channelized multi-lateral fluvial braided system, with upward

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Kemnitz, Helga, Bodo-Carlo Ehling, Olaf Elicki, Hans-Joachim Franzke, Gerd Geyer, Ulf Linnemann, Dietmar Leonhardt, et al. "Proterozoikum–Silur in der Stratigraphischen Tabelle von Deutschland 2016 The Stratigraphic Table of Germany 2016: Proterozoic to Silurian." Zeitschrift der Deutschen Gesellschaft für Geowissenschaften 168, no. 4 (March 1, 2018): 423–46. http://dx.doi.org/10.1127/zdgg/2017/0134.

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Knoll, Andrew H. "The advent of the Phanerozoic world: Vendian stratigraphy, environmental change, and evolution." Paleontological Society Special Publications 6 (1992): 169. http://dx.doi.org/10.1017/s2475262200007292.

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The Vendian interval (ca. 610–540 Ma) links Proterozoic and Phanerozoic worlds of sharply contrasting character. Despite decades of study, the nature of this transition remains unclear, in part because of our limited ability to correlate Vendian successions or evaluate shifts in global environments. New data on secular variations in the C and Sr isotopic compositions of Vendian carbonates (and organic matter) provide an improved stratigraphic and biogeochemical framework for understanding latest Proterozoic biological and environmental evolution.Biologically, the Vendian interval is best known

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HARLAND, W. BRIAN. "Origins and assessment of snowball Earth hypotheses." Geological Magazine 144, no. 4 (June 6, 2007): 633–42. http://dx.doi.org/10.1017/s0016756807003391.

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Brian Harland was for many years an editor of this journal. He was also a seminal figure in the origins of the current ‘snowball Earth’ debate, having recognized in 1964 the significance of coupling emerging palaeomagnetic data on palaeolatitude with his interpretations of diamictites. Harland worked extensively in the Arctic and knew well many of the workers involved in the arguments surrounding the origin of diamictites. He thus had a unique perspective on the evidence and the disputes surrounding it. This was his last paper but he was not able to complete it before he died. However, with th

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Dawes, P. R., and D. C. Rex. "Proterozoic basaltic magmatic periods in North-West Greenland: evidence from K/Ar ages." Rapport Grønlands Geologiske Undersøgelse 130 (December 31, 1986): 24–31. http://dx.doi.org/10.34194/rapggu.v130.7937.

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This paper is the third of a series reporting on K/Ar whole rock ages of Proterozoic basaltic rocks of the Thule district, North-West Greenland. The dating programme is a co-operative venture between the Geological Survey of Greenland and The University, Leeds, V.K., and was set up in connection with a 1:500 000 mapping project of the region between 75°N and 78° 45'N (Melville Bugt - Inglefield Land, fig. 1). Field work by one of us (PRD) has shown that several episodes of unmetamorphosed Proterozoic basic igneous rocks can be distinguished stratigraphically in the region (see below). The rout

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Green, J. W., A. H. Knoll, and K. Swett. "Microfossils from silicified stromatolitic carbonates of the Upper Proterozoic Limestone-Dolomite 'Series', central East Greenland." Geological Magazine 126, no. 5 (September 1, 1989): 567–85. http://dx.doi.org/10.1017/s0016756800022858.

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AbstractSilicified flake conglomerates andin situstratiform stromatolites of the Upper Proterozoic (c.700–800 Ma) Limestone-Dolomite ‘Series’, central East Greenland, contain well preserved microfossils. Five stratigraphic horizons within the 1200 m succession contain microbial mat assemblages, providing a broad palaeontological representation of late Proterozoic peritidal mat communities. Comparison of assemblages demonstrates that the taxonomy and diversity of mat builder, dweller, and allochthonous populations all vary considerably within and among horizons. The primary mat builder in most

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Terleev, A. A., A. A. Postnikov, A. S. Gibsher, O. V. Sosnovskaia, B. G. Kraevskii, G. N. Bagmet та D. A. Tokarev. "РЕГИОНАЛЬНАЯ СТРАТИГРАФИЧЕСКАЯ СХЕМА ВЕРХНЕПРОТЕРОЗОЙСКИХ ОТЛОЖЕНИЙ АЛТАЕ-САЯНСКОЙ СКЛАДЧАТОЙ ОБЛАСТИ". Geology and mineral resources of Siberia, № 8s (червень 2019): 4–32. http://dx.doi.org/10.20403/2078-0575-2019-8s-4-32.

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Syme, E. C., and A. H. Bailes. "Stratigraphic and tectonic setting of early Proterozoic volcanogenic massive sulfide deposits, Flin Flon, Manitoba." Economic Geology 88, no. 3 (May 1, 1993): 566–89. http://dx.doi.org/10.2113/gsecongeo.88.3.566.

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Sims, P. K., W. R. Van Schmus, K. J. Schulz, and Z. E. Peterman. "Tectono-stratigraphic evolution of the Early Proterozoic Wisconsin magmatic terranes of the Penokean Orogen." Canadian Journal of Earth Sciences 26, no. 10 (October 1, 1989): 2145–58. http://dx.doi.org/10.1139/e89-180.

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The Early Proterozoic Penokean Orogen developed along the southern margin of the Archean Superior craton. The orogen consists of a northern deformed continental margin prism overlying an Archean basement and a southern assemblage of oceanic arcs, the Wisconsin magmatic terranes. The south-dipping Niagara fault (suture) zone separates the south-facing continental margin from the accreted arc terranes. The suture zone contains a dismembered ophiolite.The Wisconsin magmatic terranes consist of two terranes that are distinguished on the basis of lithology and structure. The northern Pembine–Wausau

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Nagovitsin, K. E., A. M. Stanevich, and T. A. Kornilova. "Stratigraphic setting and age of the complex Tappania-bearing Proterozoic fossil biota of Siberia." Russian Geology and Geophysics 51, no. 11 (November 2010): 1192–98. http://dx.doi.org/10.1016/j.rgg.2010.10.004.

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Patranabis Deb, Sarbani, and Asru K. Chaudhuri. "Stratigraphic architecture of the Proterozoic succession in the eastern Chattisgarth Basin, India: tectonic implications." Sedimentary Geology 147, no. 1-2 (March 2002): 105–25. http://dx.doi.org/10.1016/s0037-0738(01)00192-0.

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Jinbiao, Chen. "An explanatory note on proterozoic stratigraphic nomenclature used in the People's Republic of China." Precambrian Research 29, no. 1-3 (June 1985): 3–4. http://dx.doi.org/10.1016/0301-9268(85)90054-3.

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Devlin, William J. "Stratigraphy and sedimentology of the Hamill Group in the northern Selkirk Mountains, British Columbia: evidence for latest Proterozoic – Early Cambrian extensional tectonism." Canadian Journal of Earth Sciences 26, no. 3 (March 1, 1989): 515–33. http://dx.doi.org/10.1139/e89-044.

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Three informal stratigraphic divisions are recognized in the uppermost Proterozoic – Lower Cambrian Hamill Group in the northern Selkirk Mountains of British Columbia. These informal divisions include a lower sandstone unit, a greenstone–graded-sandstone unit, and an upper sandstone unit. Both the lower and upper sandstone units display sedimentary characteristics that are uniform along strike and indicate a shallow-marine environment of deposition. As is typical of other exposures of the Hamil Group in southeastern British Columbia, the lower sandstone unit is coarser grained and more poorly

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Jackson, J., I. P. Sweet, and T. G. Powell. "STUDIES ON PETROLEUM GEOLOGY AND GEOCHEMISTRY, MIDDLE PROTEROZOIC, McARTHUR BASIN NORTHERN AUSTRALIA I: PETROLEUM POTENTIAL." APPEA Journal 28, no. 1 (1988): 283. http://dx.doi.org/10.1071/aj87022.

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Mature, rich, potential source beds and adjacent potential reservoir beds exist in the Middle Proterozoic sequence (1400-1800 Ma) of the McArthur Basin. The McArthur and Nathan Groups consist mainly of evaporitic and stromatolitic cherty dolostones interbedded with dolomitic siltstone and shale. They were deposited in interfingering marginal marine, lacustrine and fluvial environments. Lacustrine dolomitic siltstones form potential source beds, while potential reservoirs include vuggy brecciated carbonates associated with penecontemporaneous faulting and rare coarse-grained clastics. In contra

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Evans, James E., Joshua T. Maurer, and Christopher S. Holm-Denoma. "Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic-carbonate nearshore marine facies in the San Juan Mountains (southwestern Colorado, USA): Multiple incised valleys backfilled by lowstand and transgressive systems tracts." Geosphere 15, no. 5 (August 9, 2019): 1479–507. http://dx.doi.org/10.1130/ges02085.1.

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Abstract The Upper Devonian Ignacio Formation (as stratigraphically revised) comprises a transgressive, tide-dominated estuarine depositional system in the San Juan Mountains (Colorado, USA). The unit backfills at least three bedrock paleovalleys (10–30 km wide and ≥42 m deep) with a consistent stratigraphy of tidally influenced fluvial, bayhead-delta, central estuarine-basin, mixed tidal-flat, and estuarine-mouth tidal sandbar deposits. Paleovalleys were oriented northwest while longshore transport was to the north. The deposits represent Upper Devonian lowstand and transgressive systems trac

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Croon, Marcel, Joshua Bluett, Luke Titus, and Raymond Johnson. "Formation evaluation case study: Glyde unconventional Middle Proterozoic play in the McArthur Basin, northern Australia." APPEA Journal 55, no. 2 (2015): 429. http://dx.doi.org/10.1071/aj14064.

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The Glyde–1 and Glyde Sidetrack–1 wells were drilled by Armour Energy in the Glyde Sub-basin of the McArthur Basin, NT, Australia in August 2012. This program was to evaluate the unconventional hydrocarbon potential of the Barney Creek Shale source rock and the conventional potential of the Coxco Dolomite of the McArthur Group. The Glyde wells discovered gas in both formations. Transtensional faults in this region allowed to form a series of fault-bounded depocentres. The target gas source of the Glyde discovery is located in 1640 Ma organic-rich black shales of the Barney Creek Formation. Wea

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Gubin, Igor A., and Vladimir A. Kontorovich. "Seismogeological structure model of the Anabar-Olenek region." Georesursy 23, no. 1 (March 30, 2021): 70–77. http://dx.doi.org/10.18599/grs.2021.1.7.

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The velocity characteristics of the Upper Proterozoic-Phanerozoic sedimentary cover of the Anabar-Olenek region were studied, in particular, the bimodal character of the distribution interval P-wave velocities was established. Taking into account modern ideas about the chronostratigraphy of sediments encountered by the Charchykskaya-1, Burskaya-3410 and Khastakhskaya-930 deep boreholes, stratification of reflecting horizons was carried out and time sections from previous years were reinterpreted. From the perspective of seismic stratigraphic and seismic facies analysis, the Cambrian, Vendian,

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SAYLOR, BEVERLY Z., JANICE M. POLING, and WARREN D. HUFF. "Stratigraphic and chemical correlation of volcanic ash beds in the terminal Proterozoic Nama Group, Namibia." Geological Magazine 142, no. 5 (September 2005): 519–38. http://dx.doi.org/10.1017/s0016756805000932.

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At least twenty silicified volcanic ash beds have been identified in the Kuibis and Schwarzrand subgroups of the terminal Proterozoic Nama Group of Namibia. Nineteen of the Nama ash beds are in the Schwarzrand Subgroup in the Witputs subbasin. Two of these are in the siliciclastic-dominated lower part of the subgroup, which consists of the Nudaus Formation and Nasep Member of the Urusis Formation and comprises two depositional sequences. Identification and correlation of these ash beds are very well known based on stratigraphic position. Sixteen ash beds are contained within the carbonate-domi

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Clarke, G. L., J. P. Burg, and C. J. L. Wilson. "Stratigraphic and structural constraints on the proterozoic tectonic history of the Olary Block, South Australia." Precambrian Research 34, no. 2 (December 1986): 107–37. http://dx.doi.org/10.1016/0301-9268(86)90053-7.

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Bhattacharya, Purbasha, and Sarbani Patranabis-Deb. "Stratigraphic evolution of the Proterozoic succession in the western part of the Chattisgarh basin, India." Journal of the Geological Society of India 87, no. 3 (March 2016): 287–307. http://dx.doi.org/10.1007/s12594-016-0396-7.

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Abell, P. I., J. McClory, H. E. Hendry, and K. L. Wheatley. "Stratigraphic variations in carbon and oxygen isotopes in the dolostone of the Carswell Formation (Proterozoic) of northern Saskatchewan." Canadian Journal of Earth Sciences 26, no. 11 (November 1, 1989): 2318–26. http://dx.doi.org/10.1139/e89-197.

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Petrographic and stable isotopic analyses of stromatolitic sediments deposited in nearshore environments provides us with some of the best information available on ancient environments. Diamond drill hole CAR 58 penetrated 110 m of sediments in the lowermost part of the Proterozoic (probably Helikian age) Carswell Formation of northern Saskatchewan and gave us such an opportunity. The rocks are mainly dolostone and include, in descending order of abundance, cyanobacterial laminites, stromatolites, dolomicrites, dolorudites, breccias, and oolites. Stromatolites and Cyanobacterial laminites incr

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