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首页> 外文期刊>International Journal of Geosciences >Magnetostratigraphy of the Middle Jurassic Sediments from Kachchh Basin, Western India
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Magnetostratigraphy of the Middle Jurassic Sediments from Kachchh Basin, Western India

机译：印度西部卡奇盆地中侏罗世沉积物的磁地层学

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摘要

The palaeoposition of India after its breakup from Gondwana and its subsequent northward journey during the Mesozoic poses many tectonic riddles. A magnetostratigraphy pattern has been constructed for the Ammonoid rich Middle Jurassic Bathonian succession of Jumara Dome, Kachchh, western India. We present the first magnetostratigraphic results from the Ammonoid bearing exposed Bathonian sediments in Kachchh. The Jumara Dome comprised of mixed carbonate-siliciclastic succession is represented by the Jhurio and Patcham formations and siliciclastic-dominating Chari Formation in the Kachchh Mainland. The Jumara Dome sediments were deposited during sea-level fluctuating, and were interrupted?by storms in the shallow marine environment. This study is based on collection of 60 oriented samples from 13 successive levels. Both thermal and AF demagnetization investigations were carried out to isolate the Characteristic Remanent Magnetization (ChRM) directions. Palaeolatitudes were computed using the ChRM directions. Magnetostratigraphic column is prepared and correlated with Geological Time Scale (GTS) of [1] [2], and this column readily matched with GTS at M41 to below and exhibits the dominance of normal polarity in Jumara.
机译：印度从冈瓦纳（Gondwana）分离后的古沉积以及随后的中生代北行之旅构成了许多构造难题。已为印度西部卡奇（Cachchh）的Jumara Dome（亚玛拉巨蛋）的富含侏罗纪中侏罗统巴松岩阶构造了地磁地层图。我们提出了在卡赫赫（Gachchh）暴露于铵盐的巴吞尼亚沉积物中的第一个地磁地层学结果。由混合的碳酸盐-硅质碎屑演替组成的Jumara穹顶代表了Kachchh大陆的Jhurio和Patcham地层以及以硅质碎屑为主的Chari地层。 Jumara圆顶沉积物是在海平面波动期间沉积的，并被浅海环境中的风暴所干扰。这项研究基于从13个连续级别中收集的60个定向样本。进行了热和AF退磁研究，以分离出特征剩磁（ChRM）方向。使用ChRM方向计算古纬度。制备了地磁地层柱，并与[1] [2]的地质时间标度（GTS）相关联，该柱很容易与MTS的M41匹配至更低，并显示了Jumara中正常极性的优势。

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