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DOI	10.1016/j.apgeochem.2019.05.006
	The geochemistry of glacial deposits in Taylor Valley, Antarctica: Comparison to upper continental crustal abundances
	Dowling, Carolyn B.1; Welch, Susan A.2,3; Lyons, W. Berry 2,3
通讯作者	Welch, Susan A.
来源期刊	APPLIED GEOCHEMISTRY
ISSN	0883-2927
出版年	2019
卷号	107 页码:91-104
英文摘要	Wet-based glacial deposits have been used traditionally as an analog for upper continental crust (UCC) abundances. To provide more information on the validity of using glacial deposits from wet-based glaciers, samples deposited by the dry-based polar glaciers located in Taylor Valley, Antarctica, were collected. Stream channel sediments, comprised of igneous, metamorphic, and sedimentary rocks initially deposited as glacial tills by polar glaciers, were analyzed by XRF, ICP-MS, and SEM. Based on the Chemical Index of Alteration values and A-CN-K ternary diagram, there are low levels of chemical weathering in these tills. Additionally, major and trace element geochemical data are compared to the average UCC values. The observed discrepancies between the mean UCC and Antarctic samples develop from the existence of mafic components, most likely the McMurdo Volcanic Group and Ferrar Dolerite, being present in the Taylor Valley tills. Even though the mafic material typically comprises 3-7% of the till, the volcanic rocks have a significant influence on the till's bulk geochemistry. The existence of this mafic fraction in the dry-based glacial tills results from the reduced rate of weathering, as compared to wet-based glaciers. Geochemical analyses of the dry-based glacial tills in polar deserts, such as those found in Taylor Valley, may provide a better representative composition of the original material than wet-based glaciers and need to be incorporated into upper continental crust calculations.
英文关键词	polar dry-based glaciers Geochemistry Glacial deposits Taylor valley Antarctica
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000476985500008
WOS关键词	DRY VALLEYS ; ICE-SHEET ; ROSS SEA ; SILICICLASTIC SEDIMENTS ; EVOLUTION ; TRANSPORT ; STREAMS ; PETROGENESIS ; DENUDATION ; CHEMISTRY
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214258
作者单位	1.Ball State Univ, Dept Geol Sci, 2000 West Univ Ave, Muncie, IN 47306 USA; 2.Ohio State Univ, Sch Earth Sci, 125 South Oval Mall, Columbus, OH 43210 USA; 3.Ohio State Univ, Byrd Polar & Climate Res Ctr, 108 Scott Hall, Columbus, OH 43210 USA
推荐引用方式 GB/T 7714	Dowling, Carolyn B.,Welch, Susan A.,Lyons, W. Berry. The geochemistry of glacial deposits in Taylor Valley, Antarctica: Comparison to upper continental crustal abundances[J],2019,107:91-104.
APA	Dowling, Carolyn B.,Welch, Susan A.,&Lyons, W. Berry.(2019).The geochemistry of glacial deposits in Taylor Valley, Antarctica: Comparison to upper continental crustal abundances.APPLIED GEOCHEMISTRY,107,91-104.
MLA	Dowling, Carolyn B.,et al."The geochemistry of glacial deposits in Taylor Valley, Antarctica: Comparison to upper continental crustal abundances".APPLIED GEOCHEMISTRY 107(2019):91-104.