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| 西藏萨嘎地区构造岩石地层新认识及其构造意义 | |
| 引用本文： | 李亚林,王成善,胡修棉,M Bak,王立成,王进军,陈蕾.西藏萨嘎地区构造岩石地层新认识及其构造意义[J].矿物岩石,2007,27(3):55-62. |
| 作者姓名： | 李亚林 王成善 胡修棉 M Bak 王立成 王进军 陈蕾 |
| 作者单位： | 1. 中国地质大学青藏高原地质研究中心,北京,100083 2. 南京大学地球科学系,江苏,南京,210093 3. Institute of Geological Sciences,Jagiellonian University,Krakow Poland 4. 成都地质矿产研究所,四川,成都,610082 |
| 基金项目： | 国家自然科学基金(40672086)，国土资源部“青藏高原油气资源战略选区调查与评价”项目 |
| 摘 要： | 对萨嘎地区古近纪海相沉积放射虫化石和上覆陆相沉积年代学研究证实,原古近系折巴群包含了早白垩世—早始新世不同时代的沉积,而不整合在其上陆相磨拉石沉积时代为早始新世中晚期(41.2 Ma~46.2 Ma)。变形分析表明萨嘎地区原古近系折巴群经历了强烈复杂的构造变形,不同时代的沉积岩系呈构造岩片在空间上重复叠置,表现出典型构造岩石地层单元的特点。萨嘎地区海相沉积岩系中始新世早期放射虫化石的发现和构造属性的确定,表明始新世早期沿萨嘎一线存在一定规模的特提斯海盆,特提斯洋的最终关闭和印度-欧亚板块全面碰撞造山作用发生于早始新世中晚期,并在此后发育与碰撞造山作用相关的磨拉石沉积。 |
| 关 键 词： | 雅鲁藏布江缝合带 地层时代 构造岩石地层 放射虫 磨拉石 |
| 文章编号： | 1001-6872（2007）03-0055-08 |
| 修稿时间： | 2006-10-17 |
NEW IDEAS OF TECTONOSTRATIGRAPHY AND ITS TECTONIC SIGNIFICANCE IN SAGA REGION, SOUTHREN TIBET |
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| LI Ya-lin,WANG Cheng-shan,HU Xiu-mian,M Bak,WANG Li-cheng,WANG Jin-jun,CHEN Lei.NEW IDEAS OF TECTONOSTRATIGRAPHY AND ITS TECTONIC SIGNIFICANCE IN SAGA REGION, SOUTHREN TIBET[J].Journal of Mineralogy and Petrology,2007,27(3):55-62. | |
| Authors: | LI Ya-lin WANG Cheng-shan HU Xiu-mian M Bak WANG Li-cheng WANG Jin-jun CHEN Lei |
| Institution: | 1. Research Center for Tibetan Plateau Geology ,China University of Geoscience,Beijing 100083,China; 2. School of Earth Sciences, Nanj ing University, Nanjing 210093, China ;3. Institute of Geological Sciences, Jagiellonian University, Krakow Poland Chengdu Institute of Geology and Mineral Resource,Chengdu 610082,China |
| Abstract: | The stratigraphic age, division and tectonic attributes in Saga area, Southern Tibet provide much evidence on the evolution of Tethys and Indo-Asian collision. By the radiolarians research on the Paleogene Zheba Group in Saga region,it can be recognized that this marine stratum is comprised of Early Cretaceous-Early Eocene deposits and the molassic deposits lay over the marine sediments are 41.2 Ma- 46. 2 Ma. Structure analysis reveals that Zheba Group have undergone strong deformation and formed different tectonic slices with differnent age. These tectonic slices distributed disorderly and show the characteristics of tectono-stratigraphic units. The discovery and documentation of Early Eocene radiolarian assemblages in Saga area indicate that there was a deep sea in Saga area during early Eocene and the Indo and Asian continents collision took place during middle-late stage of early Eocene, followed by the formation of molasse after collision. |
| Keywords: | Yarlung Zangbo suture stratigraphic age tectonostratigraphy radiolarians molasse |
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