First observation of microspherule from the infratrappean Gondwana sediments below Killari region of Deccan LIP,Maharashtra(India) and possible implications

论文摘要

A rare occurrence of a microspherule has been found in the infratrappean sediments,encountered below338 m thick Deccan volcanic cover in KLR-1 scientific borehole,drilled in the epicentral zone of the 1993 Killari earthquake（Maharashtra,India）.Palynological studies of the sediments indicate their age as Early Permian（Asselian,298-295 Ma） for deposition.Transmission electron microscope studies reveal that the spherule from the infratrappeans,is having a similar composition to that of the Neoarchean amphibolite to granulite facies mid crustal basement.The spherule is non-spherical in nature,containing mostly FeO（10.70±0.20 wt.%）,CaO（13.8±0.5 wt.%）,Al203（7.78±0.30 wt.%）,MgO（6.47±0.3 wt.%）,Si02（47,46±0.50 wt.%）,Ti02（2.47±0.3 wt.%）.K20（1.89±0.20 wt.%）.and Cl（0.33±0.05 wt.%）.Since the Fe composition of the spherule is almost same as the basement rock（10.5 wt.%）,and the chlorine content is also in the same range as the basement（0.04-0.24 wt.%）,it would suggest possibility of an extraterrestrial impact over the Indian terrain during the erstwhile Gondwana sedimentation period that may be associated with the Permian-Triassic mass extinction,the most severe one in the Earth’s history.

论文目录

文章来源

类型: 期刊论文

作者: G.Parthasarathy,O.P.PANDey,B.Sreedhar,Mukund Sharma,Priyanka Tripathi,Nimisha Vedanti

来源: Geoscience Frontiers 2019年06期

年度: 2019

分类: 基础科学

专业: 地质学,地球物理学

单位: CSIR-National Geophysical Research Institute,National Institute of Advance Studies,School of Natural Sciences and Engineering.Indian Institute of Science Campus,CSIR-Indian Institute of Chemical Technology,Presently at Banaras Hindu University,Geological Survey of India

基金: PLANEX,Physical Research Laboratory,ISRO-Space Application center,Ahmedabad for financial supporting,supported by the CSIR-Emeritus Scientist project sanctioned to O.P.Pandey

分类号: P315

页码: 2281-2285

总页数: 5

文件大小: 747K

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