【摘要】 龙门山中、南段的四川大邑、崇州、汶川、都江堰毗邻地区的侏罗系发育良好,呈NE-SW走向。地层划分出白田坝组、千佛岩组、沙溪庙组、遂宁组、莲花口组以及新建五龙沟砾岩5个正式组级和1个非正式群级岩石地层单元。首次总结了岩石组合特征及相变,讨论了侏罗纪以电子自旋共振(ESR)为依据的年代地层划分,并简要叙述了白田坝期—千佛岩期冲积扇-湖相、沙溪庙期—遂宁期的河流相、莲花口期和五龙沟砾岩的洪积扇(冲积扇相)的划分依据更多还原

【Abstract】 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.更多还原