Slumping in the Upper Jurassic Baisakhi Formation of the Jaisalmer Basin, western India： Sign of synsedimentary tectonics？

作者：Matthias Alberti,Dhirendra K.Pandey,Jitendra K.Sharma,Narendra K.Swami,Alfred Uchman

摘要：A spectacularly exposed slump is described from a 120-m-long road cut between the villages of Kanod and Deva in the northeastern Jaisalmer Basin of Rajasthan,India.The Upper Jurassic part of the sediments at the outcrop was formed in a near-shore setting and belongs to the Ludharwa Member of the Baisakhi Formation.The 3-m-thick unit shows a number of asymmetric folds and thrust faults leading to an imbrication of partly lithified sandstone beds.The deformation structures allow the reconstruction of a movement towards the northwest.This agrees well with the basin configuration that shows a deepening into this direction.Although the determination of a specific trigger mechanism is difficult for soft-sediment deformation structures,an earthquake caused by synsedimentary tectonics in the basin seems to be the most likely explanation.

發文機構：Institut fur Geowissenschaften Department of Geology Earth & Planetary Sciences GrouplPalaeontology Institute of Geoiogical Sciences

關鍵詞：同沉積構造盆地結構上侏羅統印度滑塌西部梅變形結構Sedimentology Mass movements Slumping Soft-sediment deformation structures Jaisalmer Basin Jurassic

分類號： P618.13[天文地球—礦床學][天文地球—地質學]P618.130.2