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DOI	10.1007/978-3-030-01599-2_13
	The Thar Desert Calcretes: A Proxy for Understanding Late Quaternary Paleoclimate Shifts
	Achyuthan, Hema
通讯作者	Achyuthan, H (corresponding author), Anna Univ, Inst Ocean Management, Chennai 600025, Tamil Nadu, India.
会议名称	1st Springer Conference of the Arabian-Journal-of-Geosciences (CAJG)
会议日期	NOV 12-15, 2018
会议地点	Hammamet, TUNISIA
英文摘要	In the Thar Desert, India, calcretes occur in several geomorphic environments and have been classified based on their form, induration, chemistry and associations with parent material. These calcretes have been dated from late Neogene-Early Pleistocene (hardpan calcretes) to 5 ka (nodular calcretes). The calcretes consist of CaCO3 (40-75%) with SiO2, Al2O3 and Fe2O3 content in decreasing amounts. Integration of multiple data including textural, chemistry and soil micromorphology indicate that the calcrete nodules formed within the dunes are pedogenic in origin while those occurring in the interdunal depressions are largely groundwater formations. Hardpan calcretes formed on various types of bedrocks are geosols and complex in origin. Stable isotope data for the pedogenic calcretes of C and O vary from -3.8 to -0.2 parts per thousand, and between -6.1 and -1.5% for O-18 PDB values, groundwater calcretes (delta C-13 -2.0 and 2.5 parts per thousand, and between -5 and -1 parts per thousand for delta O-18) and hardpan calcretes yield slightly higher delta O-18 values (-5.9 to -1.3 parts per thousand) than the eolian pedogenic carbonates indicating that the calcretes in the desert margin of the Thar Desert was formed near the surface supporting a thin veneer of soil column. The carbon isotope values signify both C3 and C4 vegetation, with increasing C4 vegetation since the late Quaternary period.
英文关键词	Late Quaternary Calcrete Pedogenic Groundwater Geosols Semi-arid to arid conditions
来源出版物	PATTERNS AND MECHANISMS OF CLIMATE, PALEOCLIMATE AND PALEOENVIRONMENTAL CHANGES FROM LOW-LATITUDE REGIONS
ISSN	2522-8714
EISSN	2522-8722
出版年	2019
页码	53-57
ISBN	978-3-030-01599-2; 978-3-030-01598-5
出版者	SPRINGER INTERNATIONAL PUBLISHING AG
类型	Proceedings Paper
语种	英语
收录类别	CPCI-S
WOS记录号	WOS:000623519900013
WOS关键词	GEOCHEMISTRY ; CARBONATES ; RAJASTHAN
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences ; Oceanography
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences ; Oceanography
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/370228
作者单位	[Achyuthan, Hema] Anna Univ, Inst Ocean Management, Chennai 600025, Tamil Nadu, India
推荐引用方式 GB/T 7714	Achyuthan, Hema. The Thar Desert Calcretes: A Proxy for Understanding Late Quaternary Paleoclimate Shifts[C]:SPRINGER INTERNATIONAL PUBLISHING AG,2019:53-57.

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