干旱区生态环境知识资源中心(Arid): Palaeo-environmental significance of evaporative calcite crusts in the Untersee Oasis, East Antarctica

Arid

DOI	10.1017/S0954102024000075
	Palaeo-environmental significance of evaporative calcite crusts in the Untersee Oasis, East Antarctica
	Lacelle, Denis; Christy, Michelle; Faucher, Benoit; Sobron, Pablo; Andersen, Dale
通讯作者	Lacelle, D
来源期刊	ANTARCTIC SCIENCE
ISSN	0954-1020
EISSN	1365-2079
出版年	2024
英文摘要	Secondary carbonate precipitates on the surface of clasts have rarely been reported from Antarctica. Here, we infer the origin, age and palaeo-environmental significance of the calcite crusts in the Untersee Oasis, East Antarctica. The distribution of calcite crusts, which are up to 1 mm thick, is limited to locations with residual snow patches, and they have some of the highest delta O-18 (up to +17.4 parts per thousand Vienna Standard Mean Ocean Water (VSMOW)) and delta C-13 (up to +14.6 parts per thousand Vienna Pee Dee Belemnite (VPDB)) compositions of any carbonate deposits in terrestrial polar environments. Their delta O-18 and delta C-13 values are substantially enriched with respect to the isotopic values expected from equilibrium precipitation from the delta O-18 and delta C-13(DIC) (DIC = dissolved inorganic carbon) of snow meltwater. The formation of the calcite crusts is ascribed to the evaporation of residual snow meltwater and the low relative humidity and strong winds, favouring a kinetic isotope effect. The C-14 age distribution of the calcite crusts (1550 cal yr bp to modern) provides a minimum age for ice retreat and drainage of the palaeo-lake in Aurkjosen Cirque. However, in this polar desert environment in which surface melting is limited, the calcite crusts require sufficient snow accumulation and air temperatures warm enough to generate meltwater, and their age distribution corresponds to the late Holocene warm-wet climate period.
英文关键词	delta C-13 delta C-18 Antarctica carbonates Holocene radiocarbon
类型	Article ; Early Access
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001226419100001
WOS关键词	ISOTOPE COMPOSITION ; SURFACE-TEMPERATURE ; LAKE UNTERSEE ; CANADA ; PERMAFROST ; CONSTRAINTS ; DEPOSITS ; VALLEY ; ISLAND ; YUKON
WOS类目	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402836
推荐引用方式 GB/T 7714	Lacelle, Denis,Christy, Michelle,Faucher, Benoit,et al. Palaeo-environmental significance of evaporative calcite crusts in the Untersee Oasis, East Antarctica[J],2024.
APA	Lacelle, Denis,Christy, Michelle,Faucher, Benoit,Sobron, Pablo,&Andersen, Dale.(2024).Palaeo-environmental significance of evaporative calcite crusts in the Untersee Oasis, East Antarctica.ANTARCTIC SCIENCE.
MLA	Lacelle, Denis,et al."Palaeo-environmental significance of evaporative calcite crusts in the Untersee Oasis, East Antarctica".ANTARCTIC SCIENCE (2024).