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Rajmahal Traps
The Rajamal Traps is a volcanic igneous province in Eastern India, covering the parts of Jharkhand, West Bengal and Meghalaya. Rajmahal hills of Jharkhand is the type area of this province. Multiple layers of solidified lava made thick Rajmahal hill which is dipping 2°-5° towards north-east. Individual layers vary in thickness from less than 1 metre to more than 70 metre.
==Genesis==
These volcanic rocks were formed from the eruptions of the Kerguelen hotspot in the early Cretaceous.〔Courtillot, Vincent. ''Evolutionary Catastrophes: The Science of Mass Extinctions.'' Cambridge, Cambridge University Press, 1999; p. 95.〕 The similarity between the geochemical data of Rajmahal volcanis and lavas of the Kerguelen Plateau confirms this. According to the plate tectonics, the Indian subcontinent was over this hot spot during the Cretaceous age.
The original lava flow covered an area of nearly . Below the Bengal basin the flows cover .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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