| 张厚松,白培荣,熊兴国,蒋开源,吴滔,李月森.西藏塔惹增地区中二叠统下拉组碳酸盐岩微相特征及环境意义[J].贵州地质,2026,43(1):33-43 |
| 西藏塔惹增地区中二叠统下拉组碳酸盐岩微相特征及环境意义 |
| Microfacies Characteristics and Environmental Significance of Carbonate Rocks in the Middle Permian Xiala Formation，Tarezeng Area，Tibet |
| 投稿时间：2025-11-11 |
| DOI： |
| 中文关键词: 下拉组 碳酸盐岩微相 中二叠统 塔惹增地区 |
| 英文关键词:Xiala Formation Carbonate microfacies Middle Permian Tarezeng Area |
| 基金项目:中国地质调查局项目(编号:1212011086035、1212011121230、12120114062301)资助 |
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| 中文摘要: |
| 通过对西藏塔惹增地区中二叠统下拉组的野外路线调查与剖面测量，综合碳酸盐岩宏微观特征，系统分析不同岩石类型的成因及其沉积环境。基于碳酸盐岩宏微观的颗粒类型、基质含量、生物组合、胶结物类型、沉积构造和特殊矿物(燧石/白云石)为关键指标，共识别出8种碳酸盐岩微相类型，及其对应7种SMF(标准微相类型)。研究表明，下拉组以碳酸盐岩台地相为主，局部发育陆源碎屑岩相、硅质岩相和混积岩相。沉积环境演化序列为“冰川-浅海过渡→局限台地-开阔台地→台地边缘浅滩-藻席→台盆-浅海碎屑岩”，该过程受海平面变化与区域构造活动共同控制。中二叠世至侏罗纪期间的角度不整合接触，反映了印支运动构造抬升事件，完整记录了从冰川影响至碎屑岩覆盖的沉积演化历史，为研究冈底斯带的沉积格局及其演化史提供了新的依据。 |
| 英文摘要: |
| Based on field route surveys and section measurements of the Middle Permian Xiala Formation in the Tarezeng area of Tibet，this study systematically analyzes the genesis and sedimentary environments of different rock types by integrating macroscopic and microscopic characteristics of carbonate rocksUsing key indicators such as grain types，matrix content，biotic assemblages，cement types，sedimentary structures，and special minerals(chert/dolomite)from both macro- and micro-perspectives of carbonate rocks，a total of eight carbonate microfacies types and their corresponding seven SMF(Standard Microfacies Types)have been identifiedThe research indicates that the Xiala Formation is dominated by carbonate platform facies，with local development of terrigenous clastic rock facies，siliceous rock facies，and mixed rock faciesThe sedimentary environmental evolution sequence is interpreted as “glacial-shallow marine transition → restricted platform-open platform → platform marginal shoal-algal mats → platform basin-shallow marine clastic rocks” This process was jointly controlled by sea-level changes and regional tectonic activitiesThe angular unconformity contact between the Middle Permian and Jurassic reflects the tectonic uplift event associated with the Indosinian movementThe complete sedimentary evolutionary history，from glacial influence to clastic rock coverage，provides new evidence for studying the sedimentary pattern and evolutionary history of the Gangdese Belt |
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