Early Cenozoic rapid flight enigma of the Indian subcontinent resolved:Roles of topographic top loading and subcrustal erosion  

作　　者：Muthuvairavasamy Ramkumar David Menier Manoj Mathew M.Santosh Numair A.Siddiqui 

机构地区：[1]Department of Geology,Periyar University,Salem 636011,India [2]South East Asia Carbonate Research Laboratory(SEACaRL),Universiti Teknologi Petronas,31750 Tronoh,Malaysia [3]GMGL UMR CNRS 6538,Universite de Bretagne Sud,56017 Vannes Cedex,France [4]Department of Earth Sciences,University of Adelaide,SA 5005,Australia [5]School of Earth Sciences and Resources,China University of Ceosciences Beijing,29 Xueyuan Road,Beijing 100083,China [6]Department of Geosciences,Universiti Teknologi Petronas,31750 Tronoh,Malaysia

出　　处：《Geoscience Frontiers》2017年第1期15-23,共9页地学前缘（英文版）

摘　　要：Intrinsic magmatic processes are considered as critical operators of plate movements. Here we demonstrate the role of extrinsic processes consequent to intrinsic processes as a catalyst for anomalous rapid plate movement. The rapid and accelerated flight of the Indian subcontinent since Deccan volca- nism until its collision with Eurasia remains as one of the geological conundrums. Data on seismic to- mography, peninsular geomorphology and inferences on continuum of subcrustal structures are utilized to address this enigma. We propose geomorphic isostasy as the mechanism that has driven this fastest drift ever recorded in geological history. It was initiated by sudden instability after the Deccan volcanism and resultant extensive accumulation of lava pile over continental lithosphere of northern India, northern-eastern tilt due to crustal thickness heterogeneity and subcrustal thermal stratification. The drift was sustained by Carlsberg and Central Indian ridge-push until collision and sediment top loading at northeast thenceforth. These inferences and geomorphic isostasy as a catalytic mechanism necessitate variability of drift rates as integral inputs for any continental scale modeling.Intrinsic magmatic processes are considered as critical operators of plate movements. Here we demonstrate the role of extrinsic processes consequent to intrinsic processes as a catalyst for anomalous rapid plate movement. The rapid and accelerated flight of the Indian subcontinent since Deccan volca- nism until its collision with Eurasia remains as one of the geological conundrums. Data on seismic to- mography, peninsular geomorphology and inferences on continuum of subcrustal structures are utilized to address this enigma. We propose geomorphic isostasy as the mechanism that has driven this fastest drift ever recorded in geological history. It was initiated by sudden instability after the Deccan volcanism and resultant extensive accumulation of lava pile over continental lithosphere of northern India, northern-eastern tilt due to crustal thickness heterogeneity and subcrustal thermal stratification. The drift was sustained by Carlsberg and Central Indian ridge-push until collision and sediment top loading at northeast thenceforth. These inferences and geomorphic isostasy as a catalytic mechanism necessitate variability of drift rates as integral inputs for any continental scale modeling.

关 键 词：Geomorphic isostasy Mantle plume Continental drift Plate reorganization India 

分 类 号：P542[天文地球—构造地质学]