| Characteristics of the Middle-Late Triassic sedimentary facies assemblages in the Songpan-Ruoergai area |
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| 作者姓名： | YAN Zhen YU Liangjun LI Jiliang BIAN Qiantao WANG Zongqi and YANG Yongcheng |
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| 作者单位： | 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 |
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| 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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Characteristics of the Middle-Late Triassic sedimentary facies assemblages in the Songpan-Ruoergai area |
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| YAN Zhen,YU Liangjun,LI Jiliang,BIAN Qiantao,WANG Zongqi and YANG Yongcheng.Characteristics of the Middle-Late Triassic sedimentary facies assemblages in the Songpan-Ruoergai area[J].Progress in Natural Science,2007,17(3):305-313. |
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| Authors: | YAN Zhen YU Liangjun LI Jiliang BIAN Qiantao WANG Zongqi YANG Yongcheng |
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| Abstract: | 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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| Keywords: | Middle-Upper Triassic fluvial-lake environments tide environment tempestite Songpan-Ruoergai |
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