| 藏南特提斯晚侏罗世维美组的沉积环境 |
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| 引用本文： | 江新胜,颜仰基,潘桂棠,廖忠礼,朱弟成.藏南特提斯晚侏罗世维美组的沉积环境[J].地质通报,2003(Z1). |
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| 作者姓名： | 江新胜 颜仰基 潘桂棠 廖忠礼 朱弟成 |
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| 作者单位： | 成都理工大学沉积地质研究所，中国地质调查局成都地质矿产研究所，中国地质调查局成都地质矿产研究所，中国地质调查局成都地质矿产研究所，中国地质调查局成都地质矿产研究所 四川成都610059，中国地质调查局成都地质矿产研究所，四川成都610082，四川成都610082，四川成都610082，四川成都610082，四川成都610082 |
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| 基金项目： | 中国地质调查局基础地质综合项目“青藏高原地质构造及资源环境效应研究(200113900069)”成果。 |
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| 摘 要： | 对维美组的沉积结构、构造、动物群生态特征、地层展布情况和放射虫硅质岩的产出环境等进行了分析,认为维美组与其南部的同期沉积门卡墩组顶部石英砂岩一样,同属典型的滨浅海沉积,晚侏罗世康马-隆子和北喜马拉雅地层分区为统一的滨浅海,不存在次深海—深海环境。层序地层分析表明,当时曾发生了陆架海退和陆架暴露事件,造成了大面积石英砂岩的沉积和相关的层序不整合界面。侏罗纪的沉积环境演化与古地理变迁说明,藏南特提斯被动大陆边缘自形成以来并非一成不变,而是经历了多次活动、稳定,海侵、海退的过程。
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| 关 键 词： | 藏南特提斯 晚侏罗世 维美组 沉积环境 |
Sedimentary environment of the Late Jurassic Weimei Formation in the southern Tibetan Tethys |
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| JIANG Xinsheng ,YAN Yangji ,PAN Gui tang ,LIAO Zhongli ,ZHU Dicheng.Sedimentary environment of the Late Jurassic Weimei Formation in the southern Tibetan Tethys[J].Geologcal Bulletin OF China,2003(Z1). |
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| Authors: | JIANG Xinsheng YAN Yangji PAN Gui tang LIAO Zhongli ZHU Dicheng |
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| Institution: | JIANG Xinsheng 1,2,YAN Yangji 2,PAN Gui tang 2,LIAO Zhongli 2,ZHU Dicheng 2 |
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| Abstract: | The Weimei Formation is marked by Late Jurassic sediments of the southern Tibetan Tethys and belongs to the Kangmar-Longzi stratigraphic area.Analyses of the sedimentary textures and structures,eco-logical features of the faunas,stratigraphic distribution and occurrence environment of radiolarian cherts in-dicate that the Weimei Formation belong to littoral-neritic sediments as is the case with the quartz sand-stone at the top of the Menkadun Formation deposited synchronously with it.This suggests that the Late Jurassic Kangmar-Longzi stratigraphic area and the northern Himalayan stratigraphic area constituted a unify-ing littoral-neritic sea and that no bathyal-abyssal environment existed.Sequence stratigraphic analysis indi-cates that the event of continental shelf regression and exposure took place at that time ,resulting in the extensive deposition quartz sandstone and the formation of unconformity of related stratigraphic sequences.The Jurassic sedimentary environmental evolution and paleogeographic changes suggest that the passive con-tinental margin of the southern Tibetan Tethys did not remain unchanged since its formation but experi-enced repeated activities,stabilization,transgression and regression. |
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| Keywords: | southern Tibetan Tethys Late Jurassic Weimei Formation sedimentary environment |
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