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首页> 外文期刊>Journal of Asian earth sciences >Magnetostratigraphy and ~(40)Ar-~(39)Ar geochronology of the Malwa Plateau region (Northern Deccan Traps), central western India: Significance and correlation with the main Deccan Large Igneous Province sequences
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Magnetostratigraphy and ~(40)Ar-~(39)Ar geochronology of the Malwa Plateau region (Northern Deccan Traps), central western India: Significance and correlation with the main Deccan Large Igneous Province sequences

机译：印度中西部Malwa高原地区（北部Deccan圈闭）的磁地层学和〜（40）Ar-〜（39）Ar地质年代学：与主要的Deccan大火成岩省层序的意义和相关性

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Basaltic lava flows of Malwa Plateau together with the Mandla area and the Toranmal section constitute the Northern Deccan Province in central western India. With the present outcrop area of 80,000 km~2 the Malwa flows form an extensive but relatively thin sequence. We sampled Deccan basalts along two 100 km each N-S and E-W transects along the western and southern rims of the Malwa Plateau. The 67.12 ± 0.44 Ma ~(40)Ar-~(39)Ar age obtained in the present study clearly shows that the eruption of the Malwa flows started during the magnetochron C30n. By mapping the magnetic C30n/C29r transition on the western and southern edge of the plateau, the total volume and eruption rate can be calculated (42,000 km~3; 0.03 km~3/a). Furthermore the results point towards the Nar-mada-Tapi rift zone as the possible source area for the Malwa lava flows. The Malwa sequence is older and partly synchronous with the thick sequences of the Western Ghats. Since their eruption centers are spatially independent, they should not be correlated with younger, although geochemically similar, formations of the Western Ghats. Other Northern Deccan flows show clear similarities with the Malwa flows and can be magnetostratigraphically and geochemically correlated. We therefore suggest a new subgroup for the Northern Deccan Province, the "Narmada Subgroup", defined on the geochemical and magnetic characteristics of the Malwa, Mandla and Toranmal flows. The introduction of this new subgroup clarifies the position of the Northern Deccan Province in the Deccan stratigraphy and is a step towards a better understanding of the Deccan eruption history.
机译：Malwa高原的玄武岩熔岩流与Mandla地区和Toranmal部分一起构成了印度中西部的北部Deccan省。目前的露头面积为80,000 km〜2，Malwa流形成了一个广泛但相对较薄的层序。我们沿Malwa高原西部和南部边缘的N-S和E-W断面分别沿两个100 km采样了Deccan玄武岩。在本研究中获得的67.12±0.44 Ma〜（40）Ar-〜（39）Ar年龄清楚地表明，Malwa流的喷发始于磁时C30n。通过在高原的西部和南部边缘绘制C30n / C29r磁性跃迁图，可以计算出总体积和喷发速率（42,000 km〜3； 0.03 km〜3 / a）。此外，结果指向Nar-mada-Tapi裂谷带，这是Malwa熔岩流的可能来源区域。 Malwa序列较旧，并且与Western Ghats的较厚序列部分同步。由于它们的喷发中心在空间上是独立的，因此尽管地球化学上相似，但它们不应与年轻的西高止山脉形成相关。其他北部Deccan流量显示出与Malwa流量明显相似的地方，并且可以在地层学和地球化学方面相互关联。因此，我们建议北德干省建立一个新的亚类，即“ Narmada亚类”，该亚类是根据Malwa，Mandla和Toranmal流的地球化学和磁学特征定义的。引入这一新的子类明确了北部德干省在德干地层中的位置，是朝着更好地了解德干火山喷发历史迈出的一步。

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