globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.05.009
论文题名:
Postglacial Early Permian (late Sakmarian-early Artinskian) shallow-marine carbonate deposition along a 2000km transect from Timor to west Australia
作者: Haig D.W.; McCartain E.; Mory A.J.; Borges G.; Davydov V.I.; Dixon M.; Ernst A.; Groflin S.; Ha˚kansson E.; Keep M.; Santos Z.D.; Shi G.R.; Soares J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 409
起始页码: 180
结束页码: 204
语种: 英语
英文关键词: Carbonate ; Early Permian ; Eastern Gondwana ; Intracratonic ; N-S temperature gradient ; Sakmarian-Artinskian
英文摘要: Late Sakmarian to early Artinskian (Early Permian) carbonate deposition was widespread in the marine intracratonic rift basins that extended into the interior of Eastern Gondwana from Timor in the north to the northern Perth Basin in the south. These basins spanned about 20° of paleolatitude (approximately 35°S to 55°S). This study describes the type section of the Maubisse Limestone in Timor-Leste, and compares this unit with carbonate sections in the Canning Basin (Nura Nura Member of the Poole Sandstone), the Southern Carnarvon Basin (Callytharra Formation) and the northern Perth Basin (Fossil Cliff Member of the Holmwood Shale). The carbonate units have no glacial influence and formed part of a major depositional cycle that, in the southern basins, overlies glacially influenced strata and lies a short distance below mudstone containing marine fossils and scattered dropstones (perhaps indicative of sea ice). In the south marine conditions became more restricted and were replaced by coal measures at the top of the depositional sequence. In the north, the carbonate deposits are possibly bryozoan-crinoidal mounds; whereas in the southern basins they form laterally continuous relatively thin beds, deposited on a very low-gradient seafloor, at the tops of shale-limestone parasequences that thicken upward in parasequence sets. All marine deposition within the sequence took place under very shallow (inner neritic) conditions, and the limestones have similar grain composition. Bryozoan and crinoidal debris dominate the grain assemblages and brachiopod shell fragments, foraminifera and ostracod valves are usually common. Tubiphytes ranged as far south as the Southern Carnarvon Basin, albeit rarely, but is more common to the north. Gastropod and bivalve shell debris, echinoid spines, solitary rugose corals and trilobite carapace elements are rare. The uniformity of the grain assemblage and the lack of tropical elements such as larger fusulinid foraminifera, colonial corals or dasycladacean algae indicate temperate marine conditions with only a small increase in temperature to the north.The depositional cycle containing the studied carbonate deposits represents a warmer phase than the preceding glacially influenced Asselian to early Sakmarian interval and the subsequent cool phase of the "mid" Artinskian that is followed by significant warming during the late Artinskian-early Kungurian. The timing of cooler and warmer intervals in the west Australian basins seems out-of-phase with the eastern Australian succession, but this may be a problem of chronostratigraphic miscorrelation due to endemic faunas and palynofloras. © 2014.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69292
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作者单位: Centre for Petroleum Geoscience and CO Sequestration, School of Earth and Environment (M004), The University of Western Australia, 35 Stirling Highway, Crawley, Australia; School of Earth and Enivronment (M004), The University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia; Geological Survey of Western Australia, Department of Mines and Petroleum, 100 Plain St., East Perth, WA, Australia; Eni Timor-Leste Ltd., P.O. Box 52, Dili, Timor Leste; Permian Research Institute, Boise State University, 1910 University Drive, Boise, ID, United States; Institut fu¨r Geologie, Universita¨t Hamburg, Bundesstrasse 55, Hamburg, Germany; Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, QLD, Australia; School of Life and Environmental Sciences, Deakin University, 221 Burwood Highway, Burwood, VIC, Australia; Shell Development (Australia) Pty Ltd., GPO Box A47 CDC, Perth, WA, Australia; Timor Gap, E.P., Timor Plaza, Suit 301-314 Rua Presidente Nicolao, Comoro Dili, Timor Leste

Recommended Citation:
Haig D.W.,McCartain E.,Mory A.J.,et al. Postglacial Early Permian (late Sakmarian-early Artinskian) shallow-marine carbonate deposition along a 2000km transect from Timor to west Australia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,409
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