| 西藏朗杰学群复理石粒度特征及沉积环境分析 |
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| 作者姓名： | 张立国 王金贵 王硕 杨鑫朋 程洲 侯德华 陈圆圆 |
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| 作者单位： | 河北省区域地质调查院,廊坊 065000 |
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| 基金项目： | 中国地质调查局“冈底斯—喜马拉雅铜矿资源基地调查(编号: DD20160015-09)”项目资助 |
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| 摘 要： | 西藏朗杰学群作为雅鲁藏布江结合带洋板块地层序列的重要组成部分,其形成的环境对研究特提斯构造运动具有重要的意义。论文系统总结了朗杰学群的岩石组合特征、构造变形特征; 通过鲍马序列的识别,建立了4种基本层序; 根据物质组成、结构构造及层序分析,认为其发育海底扇相模式,整体属浊积扇内扇-外扇亚相环境,发育少部分主水道亚相的砂砾岩沉积,具有鲍马层序由A、C段向B、C、D和C、D、E段组合转变的特点,反映了由高流态向低流态转变的特征。运用粒度分析对朗杰学群物质成分的成熟度、分选性、搬运及沉积的形式进行了探讨,认为其与哈德逊浊积扇和现代深海阿里斯托亚扇的粒度曲线相似,应属重力流沉积中的浊流沉积类型,指示其形成于大陆斜坡环境。
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| 关 键 词： | 朗杰学群 粒度分析 沉积相 复理石 浊流沉积 |
| 收稿时间： | 2019-02-01 |
Grain size characteristics and sedimentary environment analysis of flysch in Langjiexue Group of Tibet |
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| Authors: | ZHANG Liguo WANG Jingui WANG Shuo YANG Xinpeng CHENG Zhou HOU Dehua CHEN Yuanyuan |
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| Institution: | Regional Geological Survey Institute of Hebei Province, Langfang 065000, China |
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| Abstract: | Langjiexue Group is an important part of the stratigraphic sequence of the ocean plate in Yalu Tsangpo River junction zone, and its formation environment is of great significance to the Neo-Tethys tectonic movement. The authors have systematically summarized the characteristics of rock assemblage and tectonic deformation in this paper. And four basic sequences have been established by recognizing Bauma sequence. According to the analysis of material composition, structure and sequence, it is considered that the submarine fan facies model is developed in this area, which belongs to turbidite fan especially inner-outer fan subfacies environment as a whole. A small part of the main channel of subfacies of the sand conglomerate sedimentation was developed, with the transition of Bauma sequence from A, C member to B, C, D member and C, D, E member, reflecting the characteristics of the transition from high to low fluidity. On the basis of the grain analysis of the maturity, sorting, transportation and sedimentary forms of the material composition of Langjiexue Group, the authors consider that the grain size curves of Langjiexue Group are similar to those of Hudson turbidite fan and modern deep-sea Aristoa fan. And it belongs to the turbidite depositional type in gravity flow deposits, indicating that Langjiexue Group was formed in continental slope environment. |
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| Keywords: | Langjiexue Group grain size analysis sedimentary facies flysch turbidity current deposit |
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