Ontogenetic trace element distribution in brachiopod shells: an indicator of original seawater chemistry
Lee, XQ（State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang GUIZHOU 550002, China）
Hu, RZ（Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences）
Brand, U（Department of Earth Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1）
Zhou, H（State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang GUIZHOU 550002, China）
Liu, XM（Key Laboratory of Continental Dynamics, Department of Geology, Northwest University）
Yuan, HL（Key Laboratory of Continental Dynamics, Department of Geology, Northwest University）
Cheng, HG（State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang GUIZHOU 550002, China）
- 生命科学－已发表论文 
Articulated fossil brachiopod shells have been used extensively to extract primary chemical information of Phanerozoic seawater. Despite the selection of well-preserved shells using trace element, microstructure and cathodoluminescence criteria, there are still concerns as to whether the selected brachiopod shells do indeed contain original seawater signals. Analyzed in-situ by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LAICPMS), Sr, Na, Mg, Mn, B and Ba distribute symmetrically in shell transects of the modem brachiopods Magellania flavescens and Terebratulina septentrionalis. Symmetry of the trace element distribution pattern is considered an intrinsic and original ontogenetic property of the brachiopod shell chemistry. The trace element distribution is symmetrical in a well-preserved shell of the Devonian brachiopod Independatrypa lemma, indicating that the selected shell by the conventional criteria has preserved its original seawater signal for 400 Ma. In another specimen of I. lemma that is considered diagenetically altered, trace element concentrations are asymmetrically distributed in the shell. The agreement between the distribution criteria and the conventional methods indicates the latter can be used to select brachiopod shells with original seawater chemistry. The average element concentration in the whole shell of unaltered brachiopods should be a reflection of the seawater chemistry, while its change in different part of a shell reflects ontogenetic effect, and its high frequent fluctuations in a transect are results of changes in environmental parameters with seasonal or annual characteristics. (C) 2004 Elsevier B.V. All rights reserved.
CitationChemical Geology,Volume 209, Issues 1-2, 16 September 2004, Pages 49-65
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