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Fast and pervasive diagenetic isotope exchange in foraminifera tests is species-dependent
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Fast and pervasive diagenetic isotope exchange in foraminifera tests is species-dependent
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Journal Article
Fast and pervasive diagenetic isotope exchange in foraminifera tests is species-dependent
2022
Overview
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 lessonii
) following immersion into an
18
O-enriched artificial seawater at 90 °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
18
O-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.
Paleoclimate reconstructions commonly use oxygen isotope compositions from fossil foraminifera tests as proxies. Here, the authors show that these tests exchange O-isotopes with surrounding fluids, with implications for paleotemperature records.
Publisher
Springer Science and Business Media LLC,Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 147/143
/ [SDE] Environmental Sciences
/ [SDU] Sciences of the Universe [physics]
/ Ammonia
/ calcite
/ Calcium Carbonate - chemistry
/ Chemistry Techniques, Analytical
/ Foraminifera - ultrastructure
/ Geologic Sediments - chemistry
/ Humanities and Social Sciences
/ Humans
/ Isotopes
/ Oxygen
/ Q
/ Science
/ Seawater
/ shell
/ Species
/ trends
