Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures

doi:10.1016/j.gca.2018.03.010

GIG OpenIR

	Breitenbach, Sebastian F. M.1; Mleneck-Vautravers, Maryline J.1; Grauel, Anna-Lena 1,3; Lo, Li 1,4; Bernasconi, Stefano M.2; Mueller, Inigo A.2; Rolfe, James 1; Gazquez, Fernando 1; Greaves, Mervyn 1; Hodell, David A.1
	Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN号	0016-7037
	2018-09-01
卷号	236 页码:283-296
DOI	10.1016/j.gca.2018.03.010
语种	英语
WOS研究方向	Geochemistry & Geophysics
摘要	The reliable determination of past seawater temperature is fundamental to paleoclimate studies. We test the robustness of two paleotemperature proxies by combining Mg/Ca and clumped isotopes (Delta(47)) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca and Delta(47) are measured on the same specimens of foraminifera, thereby providing two independent estimates of temperature. This replication constitutes a rigorous test of individual methods with the advantage that the same approach can be applied to fossil specimens. Aliquots for Mg/Ca and clumped analyses are treated in the same manner following a modified cleaning procedure of foraminifera for trace element and isotopic analyses. We analysed eight species of planktonic foraminifera from coretop samples over a wide range of temperatures from 2 to 29 degrees C. We provide a new clumped isotope temperature calibrations using subaqueous cave carbonates, which is consistent with recent studies. Tandem Mg/Ca-Delta(47) results follow an exponential curve as predicted by temperature calibration equations. Observed deviations from the predicted Mg/Ca-Delta(47) relationship are attributed to the effects of Fe-Mn oxide coatings, contamination, or dissolution of foraminiferal tests. This coupled approach provides a high degree of confidence in temperature estimates when Mg/Ca and Delta(47) yield concordant results, and can be used to infer the past delta O-18 of seawater (delta O-18(sw)) for paleoclimate studies. (C) 2018 Published by Elsevier Ltd.
关键词	Clumped isotopes Mg/Ca analysis Planktonic foraminifera Paleoceanography Paleoclimatology
WOS记录号	WOS:000441892600016
收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/39556
通讯作者	Breitenbach, Sebastian F. M.
作者单位	1.Univ Cambridge, Dept Earth Sci, Godwin Lab Palaeoclimate Res, Cambridge, England 2.Swiss Fed Inst Technol, Geol Inst, Zurich, Switzerland 3.Graz Univ Technol, Inst Appl Geosci, Graz, Austria 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China
推荐引用方式 GB/T 7714	Breitenbach, Sebastian F. M.,Mleneck-Vautravers, Maryline J.,Grauel, Anna-Lena,et al. Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,236:283-296.
APA	Breitenbach, Sebastian F. M..,Mleneck-Vautravers, Maryline J..,Grauel, Anna-Lena.,Lo, Li.,Bernasconi, Stefano M..,...&Hodell, David A..(2018).Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures.GEOCHIMICA ET COSMOCHIMICA ACTA,236,283-296.
MLA	Breitenbach, Sebastian F. M.,et al."Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures".GEOCHIMICA ET COSMOCHIMICA ACTA 236(2018):283-296.