globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.10.022
Scopus记录号: 2-s2.0-85034091533
论文题名:
A simple biomineralization model to explain Li, Mg, and Sr incorporation into aragonitic foraminifera and corals
作者: Marchitto T.M.; Bryan S.P.; Doss W.; McCulloch M.T.; Montagna P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481
起始页码: 20
结束页码: 29
语种: 英语
英文关键词: biomineralization ; Li/Ca ; Li/Mg ; Mg/Ca ; paleotemperature proxies ; Sr/Ca
Scopus关键词: Biomineralization ; Bone ; Calcium ; Carbonate minerals ; Pumps ; Seawater ; Seawater effects ; Benthic foraminifera ; Paleotemperature proxy ; Partition coefficient ; Precipitation rates ; Rayleigh fractionation ; Scleractinian corals ; Surface entrapment ; Temperature dependent ; Lithium ; aragonite ; benthic foraminifera ; biomineralization ; calcium ; coral ; isotopic ratio ; lithium ; magnesium ; model ; paleotemperature ; strontium ; Anthozoa ; Foraminifera ; Hoglundina elegans ; Scleractinia
英文摘要: In contrast to Li/Ca and Mg/Ca, Li/Mg is strongly anticorrelated with temperature in aragonites precipitated by the benthic foraminifer Hoeglundina elegans and a wide range of scleractinian coral taxa. We propose a simple conceptual model of biomineralization that explains this pattern and is consistent with available abiotic aragonite partition coefficients. Under this model the organism actively modifies seawater within its calcification pool by raising its [Ca2+], using a pump that strongly discriminates against both Li+ and Mg2+. Rayleigh fractionation during calcification effectively reverses this process, removing Ca2+ while leaving most Li+ and Mg2+ behind in the calcifying fluid. The net effect of these two processes is that Li/Mg in the calcifying fluid remains very close to the seawater value, and temperature-dependent abiotic partition coefficients are expressed in the biogenic aragonite Li/Mg ratio. We further show that coral Sr/Ca is consistent with this model if the Ca2+ pump barely discriminates against Sr2+. In H. elegans the covariation of Sr/Ca and Mg/Ca requires either that the pump more strongly discriminates against Sr2+, or that cation incorporation is affected by aragonite precipitation rate via the mechanism of surface entrapment. In either case Li/Mg is minimally affected by such ‘vital effects’ which plague other elemental ratio paleotemperature proxies. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110152
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Geological Sciences, University of Colorado, Boulder, CO 80309, United States; Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, United States; Department of Geosciences, Colorado State University, Fort Collins, CO 80523, United States; Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, Plouzané, 29280, France; School of Earth Sciences and ARC Centre of Excellence for Coral Reef Studies, The University of Western Australia, Crawley, WA 6009, Australia; Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Bologna, I-40129, Italy; Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSL, Gif-sur-Yvette, 91198, France

Recommended Citation:
Marchitto T.M.,Bryan S.P.,Doss W.,et al. A simple biomineralization model to explain Li, Mg, and Sr incorporation into aragonitic foraminifera and corals[J]. Earth and Planetary Science Letters,2018-01-01,481
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