Fast and pervasive diagenetic isotope exchange in foraminifera tests is species-dependent

被引：20

作者：

Cisneros-Lazaro, Deyanira ^{[1
]}

Adams, Arthur ^{[1
]}

Guo, Jinming ^{[1
]}

Bernard, Sylvain ^{[2
]}

Baumgartner, Lukas P. ^{[3
]}

Daval, Damien ^{[4
]}

Baronnet, Alain ^{[5
]}

Grauby, Olivier ^{[5
]}

Vennemann, Torsten ^{[6
]}

Stolarski, Jaroslaw ^{[7
]}

Escrig, Stephane ^{[1
]}

Meibom, Anders ^{[1
,3
]}

机构：

[1] Ecole Polytech Fed Lausanne EPFL, Sch Architecture Civil & Environm Engn, Lab Biol Geochem, CH-1015 Lausanne, Switzerland

[2] Sorbonne Univ, Museum Natl Hist Nat, CNRS UMR, IMPMC, F-75005 Paris, France

[3] Univ Lausanne, Ctr Adv Surface Anal, Inst Earth Sci, CH-1015 Lausanne, Switzerland

[4] Univ Grenoble Alpes, ISTerre, Univ Savoie Mt Blanc, CNRS,IRD,IFSTTAR, F-38058 Grenoble, France

[5] Aix Marseille Univ, CINaM, CNRS, F-13009 Marseille, France

[6] Univ Lausanne, Inst Earth Surface Dynam, CH-1015 Lausanne, Switzerland

[7] Polish Acad Sci, Inst Paleobiol, PL-00818 Warsaw, Poland

来源：

NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期

基金：

欧洲研究理事会;

关键词：

BIOMINERALIZATION; CALCITE; TEMPERATURE; CARBONATE; EVOLUTION; OXYGEN; RECRYSTALLIZATION; CHEMISTRY; TRENDS; SHELL;

D O I：

10.1038/s41467-021-27782-8

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Oxygen isotope compositions of fossil foraminifera tests are commonly used proxies for ocean paleotemperatures, with reconstructions spanning the last 112 million years. However, the isotopic composition of these calcitic tests can be substantially altered during diagenesis without discernible textural changes. Here, we investigate fluid-mediated isotopic exchange in pristine tests of three modern benthic foraminifera species (Ammonia sp., Haynesina germanica, and Amphistegina Iessonii) following immersion into an O-18-enriched artificial seawater at 90 degrees C for hours to days. Reacted tests remain texturally pristine but their bulk oxygen isotope compositions reveal rapid and species-dependent isotopic exchange with the water. NanoSIMS imaging reveals the 3-dimensional intra-test distributions of O-18-enrichment that correlates with test ultra-structure and associated organic matter. Image analysis is used to quantify species level differences in test ultrastructure, which explains the observed species-dependent rates of isotopic exchange. Consequently, even tests considered texturally pristine for paleo-climatic reconstruction purposes may have experienced substantial isotopic exchange; critical paleo-temperature record re-examination is warranted.

引用

页数：11

共 75 条

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