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 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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基金项目: | Supported by National Natural Science Foundation of China (Grant No. 40334044),Geological Surveying Project of China (Project No. 1212010611807) |
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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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Authors: | YAN Zhen YU Liangjun LI Jiliang BIAN Qiantao WANG Zongqi YANG Yongcheng |
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Institution: | 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Shaanxi Insititute of Geology Survey, Xianyang 712000, China |
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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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