Characteristics of the Middle-Late Triassic sedimentary facies assemblages in the Songpan-Ruoergai area
Characteristics of the Middle-Late Triassic sedimentary facies assemblages in the Songpan-Ruoergai area作者机构：Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Shaanxi Insititute of Geology Survey Xianyang 712000 China
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2007年第17卷第3期
页 面：305-313页
核心收录：
学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：Supported by National Natural Science Foundation of China (Grant No. 40334044) Geological Surveying Project of China (Project No. 1212010611807)
主 题：Middle-Upper Triassic fluvial-lake environments tide environment tempestite Songpan-Ruoergai
摘 要：The Middle-Late Triassic sedimentary rocks in the Songpan-Ruoergai area mainly consist of calcareous siltstone, muddy limestone, lithic arkose, feldspathic litharenite, mudstone, wormkalk, oolithic limestone, and conglomerate. Except for limestone bed increasing eastward longitudinally and vertically, the calcareous component of the sandstones increases obviously. Abundant benthic and plant fossils and their clasts occur within these rocks. The sedimentary structures predominately contain flaser, parallel, tabular, wavy, and herringbone cross beddings. These data coevally imply that the Middle-Late Triassic sediments deposited in the fluvial, lake and tide environments. Additionally, the rocks display graded, parallel, hummocky beddings, and sandy lamination, a feature characteristic of storm deposits.
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