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首页> 外文期刊>Geo-marine letters >Mineralogical, chemical and stable C and O isotope characteristics of surficial carbonate structures from the Mediterranean offshore Israel indicate microbial and thermogenic methane origin
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Mineralogical, chemical and stable C and O isotope characteristics of surficial carbonate structures from the Mediterranean offshore Israel indicate microbial and thermogenic methane origin

机译：来自地中海海上以色列的裸生物碳酸盐结构的矿物学，化学和稳定的C和O同位素特征，表明微生物和热甲烷源

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摘要

The Eastern Mediterranean continental slope offshore Israel became a focus of exploration for, and production of, natural gas in recent years. The 2010-2011 Nautilus ROV expedition performed detailed video recordings and sampling in two areas offshore Israel: the Palmachim disturbance, southwest of Tel Aviv, and an area offshore Acre, north of Haifa. An analytical programme regarding the carbonate structures was carried out, examining the overall mineralogy, stable C and O isotopes, and Ca, Mg, and Mn concentrations. This provided information on their composition and as a result. an indication of the carbon sources and temperature of formation. The major authigenic minerals identified comprised magnesian calcite, dolomite, aragonite, and lcutnohorite. The detrital minerals included quartz, clays, feldspars, and rare augite and enstatite, likely transported from the Nile estuary. The carbon isotope composition of aliquots taken from nineteen samples from these areas have an overall delta C-13 range from -62.0 to -0.1 parts per thousand PDB, indicating a range of microbial/biogenic and thermogenic methane contributions. The range of delta O-18 from 2.7 to 7.0 parts per thousand PDB reflects the range of temperatures of formation. The delta O-18 characteristics differ among areas. In general, high values; delta O-18 >5 parts per thousand PDB are recorded from area N2 of the Palmachim disturbance, indicating low temperature of formation. Low values of delta O-18 (<5%oPDB) were measured from areas W2 and W3 of the Palmachim disturbance, together with samples from area N2 of the Palmachim disturbance, and samples from areas Al and A2 offshore Acre indicate high temperature origin. Samples from an inactive chimney from area N2 range from pure dolomite to pure magnesian calcite. This trend is linked to 5 13 C increase from -39.9 to -0.1%o(PDB), and delta O-18 decrease from 6.2 to 4.7%o(PDB). These values indicate a decrease in the methane-derived carbon contribution and an
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