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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Post-K/PB younger Ar-40-Ar-39 ages of the Mandla lavas: Implications for the duration of the Deccan volcanism
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Post-K/PB younger Ar-40-Ar-39 ages of the Mandla lavas: Implications for the duration of the Deccan volcanism

机译：后K / PB较年轻的曼德拉熔岩Ar-40-Ar-39年龄：对德干火山持续时间的影响

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摘要

We present new age determinations, derived from Ar-40-Ar-39 incremental heating experiments, for basaltic lava flows from the Mandla lobe, located on the eastern margin of the main Deccan volcanic province, some similar to 1000 km from the Western Ghats escarpment The most reliable estimates of crystallization ages come from 5 plateau ages from plagioclase separates, from a stratigraphically controlled succession of 37 lava flows. We detect no statistically significant age difference from bottom to top (range 63-65 Ma) and calculate a weighted mean age for the section at 64.21 +/- 0.33 Ma. These lava flows are significantly younger than the majority of the main Deccan volcanic activity documented from the Western Ghats (67-65 Ma). The new ages are consistent, however, with geochemical correlation of the Mandla lobe lavas with the uppermost succession (Poladpur-Ambenali-Mahabaleshwar Formations) of the SW Deccan, and indicate that this post K/PB youngest phase of flood basalt activity erupted over much of the province. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们介绍了从Ar-40-Ar-39增量加热实验得出的新年龄确定，这些变化来自位于德干火山主省东部边缘的曼德拉叶上的玄武岩熔岩流，有些距西高止山脉悬崖约1000公里最可靠的结晶年龄估算来自斜长石分离的5个高原年龄，以及37个熔岩流的地层控制序列。我们从底部到顶部（范围63-65 Ma）未检测到统计学上显着的年龄差异，并计算出该部分的加权平均年龄为64.21 +/- 0.33 Ma。这些熔岩流比西高止山脉（67-65 Ma）记录的大多数Deccan主要火山活动年轻得多。然而，新时代与曼德拉叶熔岩与西南Deccan的最高演替层（Poladpur-Ambenali-Mahabaleshwar地层）的地球化学相关性相一致，并表明这一K / PB后期是洪水玄武岩活动的最年轻阶段。省的。 （C）2015 Elsevier B.V.保留所有权利。

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