Assessing kinetic fractionation in brachiopod calcite using clumped isotopes

被引：63

作者：

Bajnai, David ^{[1
]}

Fiebig, Jens ^{[1
]}

Tomasovych, Adam ^{[2
]}

Garcia, Sara Milner ^{[3
]}

Rollion-Bard, Claire ^{[3
]}

Raddatz, Jacek ^{[1
]}

Loeffler, Niklas ^{[1
,4
]}

Primo-Ramos, Cristina ^{[5
]}

Brand, Uwe ^{[6
]}

机构：

[1] Goethe Univ Frankfurt, Inst Geowissensch, Altenhoferallee 1, D-60438 Frankfurt, Germany

[2] Slovak Acad Sci, Earth Sci Inst, Dubravska Cesta 9, Bratislava 84005, Slovakia

[3] Univ Paris Diderot, UMR CNRS 7154, IPGP, 1 Rue Jussieu, F-75238 Paris 05, France

[4] Senckenberg Biodivers & Climate Res Ctr BiK F, Senckenberganlage 25, D-60325 Frankfurt, Germany

[5] Goethe Univ Frankfurt, Inst Atmosphare & Umwelt, Altenhoferallee 1, D-60438 Frankfurt, Germany

[6] Brock Univ, Dept Earth Sci, 1812 Sir Isaac Brock Way, St Catharines, ON L2S 3A1, Canada

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

关键词：

DEEP-SEA CORALS; INTRASPECIFIC VARIATIONS; TEMPERATURE-DEPENDENCE; STABLE-ISOTOPES; OXYGEN ISOTOPES; CARBON-ISOTOPE; DOUBTFUL SOUND; WATER CORALS; GROWTH; CALIBRATION;

D O I：

10.1038/s41598-017-17353-7

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：

Brachiopod shells are the most widely used geological archive for the reconstruction of the temperature and the oxygen isotope composition of Phanerozoic seawater. However, it is not conclusive whether brachiopods precipitate their shells in thermodynamic equilibrium. In this study, we investigated the potential impact of kinetic controls on the isotope composition of modern brachiopods by measuring the oxygen and clumped isotope compositions of their shells. Our results show that clumped and oxygen isotope compositions depart from thermodynamic equilibrium due to growth rate-induced kinetic effects. These departures are in line with incomplete hydration and hydroxylation of dissolved CO2. These findings imply that the determination of taxon-specific growth rates alongside clumped and bulk oxygen isotope analyses is essential to ensure accurate estimates of past ocean temperatures and seawater oxygen isotope compositions from brachiopods.

引用

页数：12

共 73 条

[71] Carbon and oxygen isotopic compositions of modern brachiopod shells from a warm-temperate shelf environment, Sagami Bay, central Japan [J].