DOI: 10.1016/j.gloplacha.2013.09.015
论文题名: Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica
作者: Brachfeld S. ; Pinzon J. ; Darley J. ; Sagnotti L. ; Kuhn G. ; Florindo F. ; Wilson G. ; Ohneiser C. ; Monien D. ; Joseph L.
刊名: Global and Planetary Change
ISSN: 0921-8232
出版年: 2013
卷: 110 起始页码: 420
结束页码: 433
语种: 英语
英文关键词: ANDRILL
; Antarctic Ice Sheet
; Electron microscopy
; Rock magnetism
; Sediment provenance
Scopus关键词: Andrill
; Antarctic ice sheets
; Climatic conditions
; Magnetic parameters
; Mcmurdo ice shelves
; Provenance studies
; Rock magnetism
; Sediment provenance
; Core drilling
; Electron microscopes
; Electron microscopy
; Glacial geology
; Glaciers
; Iron oxides
; Lithology
; Sedimentology
; Volcanoes
; Ice
; cyclicity
; electron microscopy
; facies
; glacial-interglacial cycle
; ice free corridor
; ice sheet
; ice-rafted debris
; iron oxide
; paleoclimate
; provenance
; tracer
; Antarctica
; East Antarctica
; McMurdo Ice Shelf
; Ross Sea
; Southern Ocean
; Bacillariophyta
英文摘要: The AND-1B drill core recovered a 13.57. million. year Miocene through Pleistocene record from beneath the McMurdo Ice Shelf in Antarctica (77.9°S, 167.1°E). Varying sedimentary facies in the 1285. m core indicate glacial-interglacial cyclicity with the proximity of ice at the site ranging from grounding of ice in 917. m of water to ice free marine conditions. Broader interpretation of climatic conditions of the wider Ross Sea Embayment is deduced from provenance studies. Here we present an analysis of the iron oxide assemblages in the AND-1B core and interpret their variability with respect to wider paleoclimatic conditions. The core is naturally divided into an upper and lower succession by an expanded 170. m thick volcanic interval between 590 and 760. m. Above 590. m the Plio-Pleistocene glacial cycles are diatom rich and below 760. m late Miocene glacial cycles are terrigenous. Electron microscopy and rock magnetic parameters confirm the subdivision with biogenic silica diluting the terrigenous input (fine pseudo-single domain and stable single domain titanomagnetite from the McMurdo Volcanic Group with a variety of textures and compositions) above 590. m. Below 760. m, the Miocene section consists of coarse-grained ilmenite and multidomain magnetite derived from Transantarctic Mountain lithologies. This may reflect ice flow patterns and the absence of McMurdo Volcanic Group volcanic centers or indicate that volcanic centers had not yet grown to a significant size. The combined rock magnetic and electron microscopy signatures of magnetic minerals serve as provenance tracers in both ice proximal and distal sedimentary units, aiding in the study of ice sheet extent and dynamics, and the identification of ice rafted debris sources and dispersal patterns in the Ross Sea sector of Antarctica. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888849928&doi=10.1016%2fj.gloplacha.2013.09.015&partnerID=40&md5=ee2d660dc45506f5564e1e521deab9fa
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11138
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, United States
Recommended Citation:
Brachfeld S.,Pinzon J.,Darley J.,et al. Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica[J]. Global and Planetary Change,2013-01-01,110.