气候变化领域集成服务门户(CCPortal): Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliable Salinity Proxy

CCPortal

DOI	10.1029/2019GL085576
	Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliable Salinity Proxy
	Gebregiorgis D.; Deocampo D.M.; Longstaffe F.J.; Simpson A.; Ashley G.M.; Beverly E.J.; Delaney J.S.; Cuadros J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	Most clay minerals in sedimentary environments have traditionally been considered to be of detrital origin, but under certain conditions, authigenic clay minerals can form at low temperature through the transformation of precursor clays or as direct precipitates from lake water. Such clay minerals can hold important information about the prevailing climatic conditions during the time of deposition. We present the first quantitative reconstruction of salinity in paleolake Olduvai based on the oxygen-isotope composition of authigenic clay minerals. We provide a framework illustrating that the isotopic signature of authigenic lacustrine clay minerals is related to the isotopic composition of paleo-waters, and hence to paleosalinity. This new paleosalinity proxy shows that the early Pleistocene East African monsoon was driven by combinations of precession and obliquity forcing and subsequent changes in tropical sea surface temperatures. Such quantitative lacustrine paleosalinity estimates provide a new direction of research for modeling ecosystem change based on an ecologically relevant parameter. © 2020. The Authors.
英文关键词	Atmospheric thermodynamics; Isotopes; Oceanography; Oxygen; Surface waters; Temperature; Authigenic clays; East africans; Obliquity; Oxygen isotopes; Paleosalinity; Precession; Clay minerals; clay mineral; climate conditions; detrital deposit; isotopic composition; lacustrine deposit; low temperature; monsoon; oxygen isotope; paleoclimate; paleosalinity; parameterization; precession; reconstruction; sea surface temperature
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170798
作者单位	Department of Geosciences, Georgia State University, Atlanta, GA, United States; Department of Earth Sciences, The University of Western Ontario, London, ON, Canada; Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ, United States; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, United States; Department of Earth Sciences, Natural History Museum, London, United Kingdom
推荐引用方式 GB/T 7714	Gebregiorgis D.,Deocampo D.M.,Longstaffe F.J.,et al. Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliable Salinity Proxy[J],2020,47(3).
APA	Gebregiorgis D..,Deocampo D.M..,Longstaffe F.J..,Simpson A..,Ashley G.M..,...&Cuadros J..(2020).Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliable Salinity Proxy.Geophysical Research Letters,47(3).
MLA	Gebregiorgis D.,et al."Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliable Salinity Proxy".Geophysical Research Letters 47.3(2020).