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| 西藏羌塘盆地东部中-上侏罗统沉积特征及沉积相划分 | |
| 引用本文： | 张玉修,张开均,李勇,李亚林,谢尧武,黎兵.西藏羌塘盆地东部中-上侏罗统沉积特征及沉积相划分[J].大地构造与成矿学,2007,31(1):52-62. |
| 作者姓名： | 张玉修 张开均 李勇 李亚林 谢尧武 黎兵 |
| 作者单位： | 1. 中国科学院边缘海地质重点实验室,中国科学院广州地球化学研究所,广东,广州,510640;中国科学院研究生院,北京,100049 2. 中国科学院边缘海地质重点实验室,中国科学院广州地球化学研究所,广东,广州,510640 3. 成都理工大学,四川,成都,610059 4. 中国地质大学,北京,100083 5. 西藏地勘局区调大队,西藏,拉萨,851400 |
| 基金项目： | 国家自然科学基金，1:25万温泉兵站幅区域地质调查项目 |
| 摘 要： | 详细野外剖面测量基础上,对羌塘盆地东部中-上侏罗统剖面主要岩类的宏观特征(颜色和构造)、物质组分、结构及磁化率等特征进行系统研究,研究区碎屑岩主要为砾岩、砂岩、粉砂岩和泥岩等岩类,磁化率值呈现低→高→低→高→低(雀莫错组→布曲组→夏里组→索瓦组→雪山组)的规律性变化。综合沉积特征显示雀莫错组和雪山组主要为河流相-河控三角洲相沉积,布曲组为碳酸盐缓坡相沉积为主,夏里组主要为潮坪-泻湖相沉积,索瓦组主要为混积陆棚-泻湖-潮坪相沉积,中-晚侏罗世羌塘盆地古水深在下降的总趋势中呈现浅→深→浅→深→浅的升降旋回,盆地沉积中心由东向西迁移,区域构造演化和全球海平面变化共同控制了盆地沉积面貌。 |
| 关 键 词： | 西藏 羌塘盆地 沉积相 碎屑岩 磁化率 |
| 文章编号： | 1001-1552(2007)01-0052-11 |
| 修稿时间： | 2006-03-20 |
CHARACTERISTICS AND SEDIMENTARY FACIES OF THE MIDDLE-UPPER JURASSIC CLASTIC ROCKS IN QIANGTANG BASIN, TIBET |
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| ZHANG Yuxiu,ZHANG Kaijun,LI Yong,LI Yalin,XIE Yaowu,LI Bing.CHARACTERISTICS AND SEDIMENTARY FACIES OF THE MIDDLE-UPPER JURASSIC CLASTIC ROCKS IN QIANGTANG BASIN, TIBET[J].Geotectonica et Metallogenia,2007,31(1):52-62. | |
| Authors: | ZHANG Yuxiu ZHANG Kaijun LI Yong LI Yalin XIE Yaowu LI Bing |
| Institution: | 1. CAS Key Laboratory of Marginal Sea Geology, Chinese Academy of Science, Guangzhou, GD 510640, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 100049, China; 3. Chengdu University of Technology, Chengdu, SC 610059, China ; 4. China University of Geosciences, Beijing 100083, China ; 5. Geological Survey of Xizang , Lhasa, Xizang 851400, China |
| Abstract: | The middle-upper Jurassic clastic rocks in Qiangtang basin, north Tibet are characterized by their great thickness. In this paper, we report the palaeogeography of the clastic rocks based on a systematic study of the sedimentary characteristics of the middleupper Jurassic in eastern Qiangtang Basin. Our results show that the clastic rocks mainly include conglomerates, sandstones, siltstones and mudstones. The data of magnetic susceptibility manifest two main cycles from low through high and again to low, from the Quemocuo Formation through the Buqu Formation, the Xiali Formation, the Suowa Formation to the Xueshan Formation. We believe that the Quemocuo and Xueshan Formations were dominantly formed in a river and river delta environment whereas the Buqu Formation was produced in a carbonate ramp setting. In contrast, the Xiali and Suowa Formations could have been established in tidaldelta or continental shelftidallagoon environment, respectively. Clearly, the eastern Qiangtang basin could have been continually subsiding during the Jurassic. Meanwhile, the sedimentary center of the basin could have been moving westward. The Jurassic sediment environment of the Qiangtang basin could have been controlled by the regional tectonics and global sea level change. |
| Keywords: | Tibet Qiangtang sedimentary facies clastic rocks magnetic susceptibility |
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