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《JOURNAL OF CHENGDU UNIVERSITY OF TECHNOLOGY》 2000-01
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JURASSIC SYSTEM OF DAYI, CHONGZHOU,WENCHUAN AND DUJIANGYAN, SICHUAN

GOU Zong hai, ZHAO Bing, WU Shan (Chengdu University of Technology, China)  
The Jurassic is well developed and trends in NE direction in Dayi, Chongzhou, Wenchuan and Dujiangyan regions of the south and middle segments of Longmen Mountaims, Sichuan. Some Jurassic sections were surveyed in the regions during the 1∶50 000 regional geological survey of the Wanjiaping and Sanjiang maps from 1997~1999. From these sections, five regulary lithostratigraphic units namely, Baitianba Formation , Qianfuyan Formation, Shaximiao Formation, Suining Formation, Lianhuakou Formation and Wulonggou conglomerate rock and one informal lithostratigraphic unit, were recognized and correlated with the corresponding units in the adjacent areas. Their lithologic characters and facies change were summarized. The Jurassic chronostratigraphy is discussed on the basis of ESR dating data. The bases for the division of the alluvial fan to lake facies of Baitianba to Qianfuyan period, the river facies of Shaximiao Suining period and alluvial fan facies of Lianhuakou period and Wulonggou conglomerate rock period are briefly described.
【Fund】: 国家“九五”1∶ 5 0 0 0 0区域地质调查项目
【CateGory Index】: P534.52
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