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首页> 外文期刊>Journal of Asian earth sciences >Fossil thermal structure of the southern Sanandaj-Sirjan zone (SW Iran): Implications for regional-scale tectonics
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Fossil thermal structure of the southern Sanandaj-Sirjan zone (SW Iran): Implications for regional-scale tectonics

机译：Southand Sanandaj-Sirjan区的化石热结构（SW伊朗）：对区域规模构造的影响

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摘要

The Sanandaj-Sirjan Zone (SSZ) is one of the Cimmerian blocks accreted to Eurasia during the Late Triassic and the only tectonic unit of the Zagros orogen affected by Barrovian metamorphism. Both the age and absolute temperature of this metamorphic event are still poorly defined. In the present study, we use the Raman Spectrometry of Carbonaceous Material (RSCM) to estimate maximum temperatures attained in the southern SSZ, along two SW-NE cross-sections. While maximum obtained temperature for Precambrian to Jurassic rocks ranges from similar to 200 to similar to 600 degrees C, all Precambrian and Early Paleozoic samples record temperatures 500 degrees C. Results thus reveal the existence of a major temperature contrast between Precambrian to Devonian samples (showing T-max 500 degrees C) and Late Devonian to Cretaceous ones (T-max 400 degrees C). This temperature contrast can be assigned to two distinct end-member scenarios, either to a so far unreported Variscan thermal event or to differential exhumation along later thrusts. The stepwise decrease of temperatures with age, and the tectonic style common to rocks older than the Early Paleozoic, strongly support the existence of a thermal (and likely) deformation event at similar to 380-360 Ma. The SSZ, which was part of the northern edge of Gondwana at that time, was thus affected by Variscan tectonics, similar to what is known in western Europe or NW Africa.
机译：Sanandaj-Sirjan区（SSZ）是在后期三叠纪的Cimmerian块之一，Zagros Orogen的唯一构造单元受到巴洛沃族变质的唯一。这种变质事件的年龄和绝对温度仍然定义不足。在本研究中，我们使用碳质材料（RSCM）的拉曼光谱法沿两个SW-NE横截面估计南部SSZ中获得的最大温度。虽然最多获得的侏罗纪岩石的温度与200相似到600℃，但所有的锋利亚和早期古生代样品都记录温度500℃。因此，结果揭示了前预先对德文郡样品之间的一个主要温度对比的存在（显示T-Max> 500摄氏度）和晚德蒙斯到白垩纪（T-Max <400℃）。该温度对比可以分配给两个不同的最终成员场景，无论是到目前为止未报告的variscan热事件还是沿后推力的差分呼出。随着年龄的增长，温度逐步减少，以及比早期古生代的岩石共同的构造风格强烈地支持与380-360 mA类似的热（和可能的）变形事件的存在。这次是吉隆邦北部边缘的一部分，因此受到了瓦里希斯的构造影响，类似于西欧或NW非洲所着偿的情况。

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