Stable isotope of some selected Egyptian pectinids and their paleoenvironmental implications |
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| Authors: | Soheir H El-Shazly |
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| Institution: | 1. Department of Applied Geology, Faculty of Engineering and Science, Curtin University of Technology Sarawak, CDT 250, Miri 98009, Malaysia;2. Geocom Consultants, Valle del Portet 17, Benitachell 03726, Spain;3. Graduate School of Environment and Information Science, Yokohama National University, 79-7, Tokiwadai, Hodogaya, Yokohama 240-8501, Japan;4. University of Tsukuba, Tsukuba, Japan;5. 1-1-2-C-740 Yokodai, Tsukubamirai 300-2358, Japan;1. Earth Surface Dynamics Institute, Lausanne University, Switzerland;2. Aix-Marseille Univ, CNRS, IRD, CEREGE, Europole Méditerranéen de l''Arbois, BP80, 13545 Aix-en-Provence, France;3. Earth Science Department, LMI Picass''Eau, Ngaoundere University, Ngaoundere, Cameroon;4. Normandie Univ, UNIROUEN, UNICAEN, CNRS, M2C, 76000 Rouen, France;5. HSM, LMI Picass''Eau, IRD, Université de Montpellier, Montpellier, France;1. Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) y Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, X5016CGA Córdoba, Argentina;2. Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, X5016CGA Córdoba, Argentina |
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| Abstract: | Eight pectinid shells were collected and subjected to quantitative study using δ18O and δ13C isotopic analysis in order to study the paleoenvironment which prevailed during their calcification. The scalerochronological variations in δ18O and δ13C values, among these shells are also discussed. The Early Miocene pectinid shells display highly depleted δ18O and δ13C signature as a result of paleo-meteoric water with heavy rainfall that was produced by Tropical Cyclones when the Mediterranean Sea was open. The Early Pliocene pectinid shells reveal depleted δ18O values, related to the influx of fresh water influenced by monsoonal activity following the formation of the Tibetan Plateau. Their enrichment in the δ13C isotopic excursion is referred to high productivity of the Indian Ocean, which was the main source of the Red Sea water. The Pleistocene pectinid shell shows highly depleted δ18O and δ13C signature with obvious diagenetic shell structure, indicating that a wetter humid climate prevailed during the Early–Middle Pleistocene and long sub-arial exposure of the shell. The Recent Mediterranean pectinid shell displays slight enrichment in δ18O and δ13C values referring to deeper inhabitation of this species with a low temperature and high salinity environment. The scalerochronological variations in both δ18O and δ13C values, along these shells is referred to seasonal variations or kinetic effects. |
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