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首页> 外文期刊>Journal of Asian earth sciences >Origin of the natural gas seep of Cirali (Chimera), Turkey: Site of the first Olympic fire
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Origin of the natural gas seep of Cirali (Chimera), Turkey: Site of the first Olympic fire

机译：土耳其契拉勒（Chimera）天然气渗流的起源：第一次奥林匹克大火的发源地

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摘要

The Olympos Mountain, located to the west of the city of Antalya (SW Turkey) in the Cirali (Chimera) area, is well known since 2500 years ago for the occurrence of gas seeps from ophiolites. The area comprises a large allochthonous slab known as the Tekirova ophiolite and is represented by intensely serpentinized ultramafic rocks. The Chimera gas escapes through fracture zones in the ophiolite. The ophiolitic slab is structurally bounded by a carbonate platform, termed the Beydaglan autochthon. Emplacement of the ophiolite nappes onto the carbonate platform took place in the Tertiary (Eocene). This study is aimed at determining the origin and possible source rocks of this gas. Several samples of both gas and the ophiolite were collected at different sites to determine the molecular and isotopic composition of the gases and mineralogical composition of the ophiolites. The seep gases contain hydrocarbons up to C_5, carbon dioxide (< 1%) and a considerable amount of nitrogen (up to 20%). The gaseous hydrocarbons are dominated by methane ( > 91%). The stable carbon isotope ratios of methane, ethane and propane are defined with a δ~(13)C_1 of -12.5per thousand to -11.6per thousand, δ~(13)C_2 of -23.5%, to -22.0per thousand and δ~(13)C_3 of -23.7per thousand to -21.0per thousand, respectively. The δD_1 values of methane range from -129per thousand to -96per thousand. XRD measurements on the ophiolite revealed the presence of brucite, hydromagnesite, aragonite, calcite and lizardite-chrysotile mineral assemblage. Two possible sources are determined for the Chimera gas. The first is an abiogenic process of serpentinization within the Tekirova ophiolite, which would result in heavy methane formation. The second are the Upper Paleozoic to Lower Mesozoic organic-rich shales in which methane to pentane hydrocarbons were thermally generated.
机译：Olympos山位于Cirali（Chimera）地区的Antalya（西南土耳其）市西部，自2500年前就因蛇绿岩中的气体渗漏而闻名。该地区包括一块大型的异质石板，称为Tekirova蛇绿岩，以强烈蛇纹石化的超镁铁质岩为代表。嵌合体气体通过蛇绿岩中的破裂带逸出。脂石板在构造上由碳酸盐台地界定，称其为Beydaglan autochthon。在第三纪（始新世）发生了蛇绿岩尿布到碳酸盐岩台面上的沉积。这项研究旨在确定这种气体的来源和可能的烃源岩。在不同位置收集了几种气体和蛇绿岩样品，以确定气体的分子和同位素组成以及蛇绿岩的矿物学组成。渗漏气体包含的碳氢化合物含量最高为C-5，二氧化碳（<1％）和大量的氮气（含量最高为20％）。气态碳氢化合物以甲烷为主（> 91％）。甲烷，乙烷和丙烷的稳定碳同位素比定义为δ〜（13）C_1为-12.5 /千至-11.6 /千，δ〜（13）C_2为-23.5％至-22.0 /千和δ 〜（13）C_3分别为-23.7 /千至-21.0 /千。甲烷的δD_1值介于-129 /千至-96 /千。对蛇绿岩的XRD测量表明存在水镁石，菱镁矿，文石，方解石和蜥蜴石-温石棉矿物组合。确定了Chimera气体的两种可能来源。首先是Tekirova蛇绿岩中蛇纹石化的非生物成因过程，这将导致大量甲烷形成。第二个是上古生界到下中生界富含有机物的页岩，其中热生成甲烷到戊烷碳氢化合物。

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