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Novel observations on biomineralization processes in foraminifera and implications for Mg/Ca ratio in the shells

2005; Geological Society of America; Volume: 33; Issue: 11 Linguagem: Inglês

10.1130/g21800.1

1943-2682

Shmuel Bentov, Jonathan Erez,

earthquake and tectonic studies

Research Article| November 01, 2005 Novel observations on biomineralization processes in foraminifera and implications for Mg/Ca ratio in the shells Shmuel Bentov; Shmuel Bentov 1Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond Safra Campus, Givat Ram, Jerusalem 91904, Israel Search for other works by this author on: GSW Google Scholar Jonathan Erez Jonathan Erez 1Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond Safra Campus, Givat Ram, Jerusalem 91904, Israel Search for other works by this author on: GSW Google Scholar Geology (2005) 33 (11): 841–844. https://doi.org/10.1130/G21800.1 Article history received: 19 Apr 2005 rev-recd: 01 Jul 2005 accepted: 06 Jul 2005 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Shmuel Bentov, Jonathan Erez; Novel observations on biomineralization processes in foraminifera and implications for Mg/Ca ratio in the shells. Geology 2005;; 33 (11): 841–844. doi: https://doi.org/10.1130/G21800.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Stable isotopes and trace elements in foraminifera shells are important for determining the paleochemistry of the ocean, and Mg/Ca ratios and δ18O values in foraminifera have recently been used to determine simultaneously the temperature and salinity of past oceans. However, large variations between species and significant Mg intra-shell heterogeneity indicate a major role for biological factors in determining the Mg/Ca ratio in foraminifera. Our novel in vivo observations on the biomineralization process of perforate foraminifera show that their calcareous wall is composed of two different calcite types: a thin, high-Mg primary layer, and low-Mg layers that cover the primary layer on both sides. The data may suggest that two biomineralization pathways are employed in the formation of the different calcite types. A new conceptual framework is provided to explain part of the Mg heterogeneity in foraminiferal shells and the variable sensitivity of the Mg/Ca ratio to temperature in different species. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.