Mineralogical and geochemical compositions of modern bivalve shells from the Mediterranean coast of Egypt期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Mineralogical and geochemical compositions of modern bivalve shells from the Mediterranean coast of Egypt

Authors:	H Holail R Tony

Institution:	(1) Geology Department, University of Qatar, Faculty of Science, PO 2713, Doha, Qatar;(2) Geology Department, Alexandria University, Faculty of Science, Alexandria, Egypt

Abstract:	The stable isotopic composition (¹³C and ¹⁸O) and elemental (Sr and Mg) of marine molluscs are presented for Carditacea and Solenacea shells collected off the Mediterranean coast of Egypt. Based on shell microstructures and mineralogy, the bivalve shells are preserved in their original mineralogy and chemistry.The Sr and Mg concentrations of the bivalve shells have mean values of 1960 ppm and 226 ppm respectively. The stable isotopic composition generally show high values of ¹⁸O and ¹³C. The ¹⁸O values range from +0.1 to –1.8 PDB and most shells are highly enriched in¹³C; averaging +2.5 PDB. These elemental and isotopic signatures are analogous to modern marine bivalves from other localities.The oxygen and carbon isotopes, together with the calculated temperatures, suggest that the aragonitic bivalve shells were precipitated in isotopic equilibrium from warm marine waters.

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