Geophysical lineaments of Western Ghats and adjoining coastal areas of central Kerala, sou

Geophysical lineaments of Western Ghats and adjoining coastal areas of central Kerala, southern

India and their temporal development

P.Ajayakumar;S.Rajendran;T.M.Mahadevan

【期刊名称】《地学前缘(英文版)》 【年(卷),期】2017(008)005

【摘要】A family of geophysical lineaments have been identified in ～15,000 km2 in central Kerala between 9°30′N to 10°45′N and 76°00′E to 77°30′E,integrating

geophysical

data

with

geological

and

geomorphological features.The characteristics of these lineaments in the magnetic and gravity fields and their derivatives have been analysed.The evolution of the lineaments has been traced to the temporal phases of global evolution of the region.A group of these faults have formed by reactivation of the deep-seated distensional fractures associated with and accompanying dyke emplacements during the episodic breakup of Gondwana at ～90 and 65 Ma under distinctive mantle thermal regimes.It is possible that reactivation of these distensional faults may have started during the cooling interval of time between the two distensions in the 90 and 65 Ma and post 65 Ma periods and later in the Cenozoic,when the lineaments were enlarged to their present dimension,possibly under the influence of forces that led to the uplift of the western Ghats.These may extend down to the crust-

mantle interface.A cluster of younger geophysical lineaments has been generated by reactivation along the weak planes of transformation of the charnockitic rocks of the Precambrian.They seem to have a strike-slip character.They are devoid of any dyke association and were formed on a cold crust.They may be confined to the upper-middle crust.They were generated in the high intensity intra-plate palaeo-stress fields of the triple forces arising from (1) the back-thrust from the Himalayan Collision;(2) the impact of epeirogenic forces and related isostatic uplift of the Western Ghats and (3) the flexural isostatic uplifts due to surface loads of late Mesozoic basaltic lavas and Cenozoic sedimentation in the coastal rifted basins in late Cenozoic,probably in the time span of 20 Ma to the present,when the palaeostress fields were most intense. 【总页数】16页(1089-1104) 【关键词】

【作者】P.Ajayakumar;S.Rajendran;T.M.Mahadevan

【作者单位】Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Cochin, Kerala, 682 016, India;Department of Marine Geology and Geophysics, Cochin University of Science and Technology, Cochin, Kerala, 682 016, India;Sree Bagh, Ammankovil Road, Cochin, Kerala, 682 035, India 【正文语种】英文 【中图分类】

【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_geoscience-frontiers_thesis/0201253166648.html 【相关文献】

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