Abstract:

In the MiddleLate Permian, a large scale of mantle plume event in Emeishan took place in the UpperYangtze region and the volcanic product of the event was Emeishan Basalt. The sedimentarytectonic evolution of mantle plume in Emeishan, and sedimentary characteristics and sedimentary responses of volcanic activity were studied. Mantle plume in Emeishan is considered to have undergone the stages of deep magmatic activity, volcanic dome, volcanic eruption, crustal subsidence, etc. Mantle plume also caused other correlative important events such as volcanic dome, earthquake, tsunami and hydrothermal activity, and  its sedimentary responses included syngenetic deposit sliding, hydrothermal deposit and storm deposit. Therefore, the lump limestones of Maokou Formation and their characteristics are the results of syngenetic deposit sliding, the flints of Maokou FormationChangxing Formation are hydrothermal deposits of magmatic differentiation, and the mud and megaclast in the Maokou Formation is the result of storm deposit. Disorderly deposits of Maokou Formation and Wujiaping Formation are related to earthquake activities, which may be called  seismite.

Key words: mantle plume in Emeishan; basalt; volcanic activity; sedimentary response

Key words:  mantle plume in Emeishan, basalt, volcanic activity, sedimentary response