globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.07.010
论文题名:
Ichnology of a Paleopolar, River-Dominated, Shallow Marine Deltaic Succession in the Mackellar Sea: The Mackellar Formation (Lower Permian), Central Transantarctic Mountains, Antarctica
作者: Jackson A.M.; Hasiotis S.T.; Flaig P.P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441
起始页码: 266
结束页码: 291
语种: 英语
英文关键词: Brackish ; Gondwana ; High-latitude ; Icehouse-greenhouse ; Ichnology ; Mackellar
英文摘要: The Lower Permian Mackellar Formation in the Beardmore Glacier Area of the Central Transantarctic Mountains, Antarctica, was deposited between 80 and 85°S paleolatitude. Previous studies suggest that Mackellar Formation strata were deposited in either a large glacial lake or inland sea. Our study identified 30 ichnogenera from Turnabout Ridge and Buckley Island of which: 1) none are exclusively freshwater forms; 2) 20 ichnogenera are found in freshwater, brackish, and marine settings; and 3) 10 ichnogenera are exclusively found in marine settings. Combining ichnologic evidence with sedimentologic observations suggests that the Mackellar Formation was deposited in a river-dominated delta in a fully marine to brackish-marine setting. Trace-fossil associations are grouped into the Arenicolites-. Phycodes, Lingulichnus, Arenicolites-. Planolites, Kouphichnium, Phycodes-. Teichichnus-Arenicolites, and Planolites-. Teichichnus-. Phycodes ichnocoenoses of a mixed Skolithos-Cruziana ichnofacies. These associations are characteristic of epi- and endobenthic worms arthropods, and mollusks, with the vast majority of the traces being diminutive in diameter and length, and exhibit shallow (≤. 10. mm) penetration depths. These ichnocoenoses occur in paleoenvironments that include the prodelta, distal to proximal delta front including mouth bars, and subaqueous terminal distributary channels. The diminutive morphology, shallow penetration depth, low bed ichnodiversity, high overall ichnodiversity, and sedimentologic characteristics are indicative of benthic organisms in a marine deltaic environment with short-lived communities composed of small-bodied organisms stressed by high freshwater input and high sedimentation rates. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68661
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geology, The University of Kansas, 1475 Jayhawk Blvd., Lindley Hall, Lawrence, KS, United States; Bureau of Economic Geology, The University of Texas at Austin, Jackson School of Geosciences, 10100 Burnett Road, Austin, TX, United States

Recommended Citation:
Jackson A.M.,Hasiotis S.T.,Flaig P.P.. Ichnology of a Paleopolar, River-Dominated, Shallow Marine Deltaic Succession in the Mackellar Sea: The Mackellar Formation (Lower Permian), Central Transantarctic Mountains, Antarctica[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441
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