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首页> 外文期刊>Journal of Asian earth sciences >Geochemistry and Ar-Ar muscovite ages of the Daraban Leucogranite, Mawat Ophiolite, northeastern Iraq: Implications for Arabia-Eurasia continental collision
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Geochemistry and Ar-Ar muscovite ages of the Daraban Leucogranite, Mawat Ophiolite, northeastern Iraq: Implications for Arabia-Eurasia continental collision

机译：伊拉克东北部Mawat Ophiolite的Daraban Leucogranite的地球化学和Ar-Ar白云母年龄：对阿拉伯-欧亚大陆碰撞的影响

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摘要

Daraban Leucogranite dykes intruded discordantly into the basal serpentinized harzburgite of the Mawat Ophiolite, Kurdistan region, NE Iraq. These coarse grained muscovite-tourmaline leucogranites are the first leucogranite dykes identified within the Mawat Ophiolite. They are mainly composed of quartz, K-feldspar, plagioclase, tourmaline, muscovite, and secondary phologopite, while zircon, xenotime, corundum, mangano-ilemnite and cassiterite occur as accessories. The A/CNK value of the granite dyke samples varies from 1.10 to 1.22 indicating a strongly peralumi-nous composition. CaO/Na_2O ranges from 0.11 to 0.15 and Al_2O_3/TiO_2 from 264 to 463, similar to the strongly peraluminous (SP) granites exposed in 'high-pressure' collision zones such as the Himalayas. Ar-Ar muscovite step-heating dating yields 37.57 ± 0.25 and 38.02 ± 0.53 Ma plateau ages for two samples which are thought to reflect either their magmatic emplacement or resetting during collision-related metamorphism. Mineral chemistry shows evidence of both primary and secondary types of muscovite, with cores favouring the magmatic interpretation and slight effects of a late syn-serpentinization fluid seen at the rims. Geochemical features of Daraban Leucogranite dykes favour a syn-collisional tectonic setting. They probably formed in response to the continental collision between Eurasia and Arabia during the initial stage of the opening of the Gulf of Aden at 37 Ma. The muscovite ages and geochemical features of Daraban Leucogranite are strong evidence for the timing of the continental collision between northeastern Arabia and Eurasia in Kurdistan region of Iraq.
机译：达拉班白云岩岩脉不合时宜地侵入伊拉克东北部库尔德斯坦地区Mawat蛇绿岩的基底蛇纹石化的Harzburgite。这些粗粒白云母-电气石白云母岩是Mawat蛇绿岩中最早发现的白云母岩脉。它们主要由石英，钾长石，斜长石，电气石，白云母和次生次金云母组成，而锆石，xenotime，刚玉，锰铁硅藻土和锡石则为辅料。花岗岩堤坝样品的A / CNK值在1.10到1.22之间变化，表明其高铝含量。 CaO / Na_2O的范围从0.11到0.15，Al_2O_3 / TiO_2的范围从264到463，类似于暴露在“高压”碰撞区（如喜马拉雅山）中的强铝质（SP）花岗岩。两个样品的Ar-Ar白云母阶梯加热年代测定法可得出37.57±0.25和38.02±0.53 Ma的高原年龄，据认为这反映了它们的岩浆侵位或在与碰撞有关的变质过程中的复位。矿物化学显示白云母的主要和次要类型的证据，岩心有利于岩浆解释，并且在轮辋处发现了晚期合蛇纹石化液的轻微影响。 Daraban Leucogranite堤的地球化学特征有利于同碰撞构造环境。它们的形成可能是对亚丁湾在37 Ma开放初期的欧亚大陆和阿拉伯大陆之间的大陆碰撞的反应。 Daraban Leucogranite的白云母年龄和地球化学特征是伊拉克东北部地区与伊拉克库尔德地区的欧亚大陆发生大陆碰撞时间的有力证据。

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