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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2010-04
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Characters of Carnian in the frontal area of Mt.Longmenshan:implications for palaeoenvironment and paleoclimate

SHI Zhi-qiang,ZHANG Hua,ZENG De-yong,QIAN Li-jun,OU Li-hua Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China  
The Upper Triassic Carnian marine sediments show the tinctorial and lithological change from grey ooides,sponge reef limestone to dark grey,grayish black shale,peliticsiltstone in the frontal region of the Longmenshan Mountains.In Jushui of Anxian and Hanwang of Mianzhu,a set of carbonate deposits developed in the Carnian of Ma'antang Formation.Among them the Hexactinellida biolithite is found and formed the sponge reef groups of the belt-shaped distribution.Through field study of the sponge reefs in Jushui of Anxian and the sections in Ma'antang of Jiangyou,Shangsi of Guangyuan and Hanwang of Mianzhu,the authors think that the sponge reefs in the frontal region of the Longmenshan Mountains grew in the deeper water body with complex landform and with low energy.In the Longmenshan Mountain area,the sponge reefs are overlain by black mudstone(shale)and silty mudstone and the boundary is obvious.This set of Carnian mudstone is distributed stably over West Sichuan and implicates the Carnian Pluvial Event.The death of the sponge in the Jushui area was triggered by this event which was influenced by megamonsoon and the input of terrigenous materials.
【Fund】: 国家自然科学基金资助项目(40872082)
【CateGory Index】: P534.51;P532
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