globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.08.002
Scopus记录号: 2-s2.0-84983772847
论文题名:
Generation and fate of glacial sediments in the central Transantarctic Mountains based on radiogenic isotopes and implications for reconstructing past ice dynamics
作者: Farmer G.L.; Licht K.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 150
起始页码: 98
结束页码: 109
语种: 英语
英文关键词: Glacial sedimentology ; Ice dynamics ; Isotope geochemistry
Scopus关键词: Dynamics ; Erosion ; Exploratory geochemistry ; Glacial geology ; Glaciers ; Grinding (comminution) ; Isotopes ; Landforms ; Lead ; Sediments ; East antarctic ice sheets ; Glacial sedimentologies ; Ice dynamics ; Ice sheet dynamics ; Isotope geochemistry ; Isotopic characteristics ; Isotopic composition ; Radiogenic isotopes ; Ice ; comminution ; detritus ; geochemical survey ; glacial deposit ; glacial erosion ; grain size ; ice drift ; isotopic composition ; moraine ; provenance ; radionuclide ; reconstruction ; zircon ; Antarctic Ice Sheet ; Antarctica ; Byrd Glacier ; East Antarctica ; Ross Sea ; Southern Ocean ; Transantarctic Mountains
英文摘要: The Nd, Sr and Pb isotopic compositions of glacial tills from the Byrd and Nimrod Glaciers in the central Transantarctic Mountains (TAM) in East Antarctica were obtained to assess the sources of detritus transported by these ice masses. Tills from lateral moraines along the entire extent of both glaciers have isotopic compositions consistent with their derivation predominately from erosion of adjacent bedrock. Fine- (<63μ) and coarser-grained (0.5 mm−2 mm) sediment from these tills have identical isotopic characteristics, indicating that fine-grained detritus is the product of further comminution of coarser sediments. Comparison of present-day till isotopic data to existing data from fine-grained LGM tills in the central Ross Sea confirm that these were deposited from East Antarctic ice that expanded through the TAM and indicates that the LGM sediments are mixtures of detritus eroded along the entire path of ice transiting the TAM. If specific lithologies were preferentially eroded as ice passed through the TAM, it is not clearly evident in the Ross Sea till isotopic compositions. Our data do demonstrate, however, that glacial tills generated from erosion of inboard regions of the mountain belt yield sediment with a larger component of 560 Ma to 600 Ma detrital zircons and lower average εNd(0) values (<−5) than that produced further downstream. As a result, past retreat of ice grounding-lines up the narrow valleys of the TAM resulting in active erosion of inboard region should recognizable in glacial sediments deposited in the Ross Sea and so provide a means to identify times when the East Antarctic ice sheet was smaller than today. This study highlights both the value and necessity of utilizing multiple provenance methods in evaluating glacial erosion and transport when reconstructing past ice sheet dynamics. © 2016 Elsevier Ltd
资助项目: This material is based upon work supported by the National Science Foundation under Grant No. OPP-0440177 to the University of Colorado and OPP-0440885 to IUPUI. We are grateful to field team members D. Brecke, A. Barth, P. Braddock, and J. Goodge, as well as Crazy Jim Haffey of Ken Borek Air, Ltd. and Raytheon Polar Services. Comments by the journal reviewers resulted in substantial improvements to the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59446
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作者单位: Department of Geological Sciences and CIRES, University of Colorado Boulder, United States; Department of Earth Sciences, Indiana University– Purdue University Indianapolis, Indianapolis, IN, United States

Recommended Citation:
Farmer G.L.,Licht K.J.. Generation and fate of glacial sediments in the central Transantarctic Mountains based on radiogenic isotopes and implications for reconstructing past ice dynamics[J]. Quaternary Science Reviews,2016-01-01,150
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