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| 青藏高原腹地典型岩体热历史与构造—地貌演化过程的热年代学分析 | |
| 引用本文： | 吴珍汉,周继荣,等.青藏高原腹地典型岩体热历史与构造—地貌演化过程的热年代学分析[J].地质学报,2001,75(4):468-476. |
| 作者姓名： | 吴珍汉 周继荣 |
| 作者单位： | 1. 中国地质科学院地质力学研究所, 2. 地质出版社, 3. Department of Earth Sciences Syracuse University, |
| 基金项目： | 国家重点基础研究发展规划95-13-01-06课题，INDEPTH-Ⅲ项目地质课题，国家攀登预选项目95-S-03-02 |
| 摘 要： | 通过对青藏高原腹地不同构造部位的班戈、雄梅、羊八井、拉萨花岗岩和甲岗、曲水花岗闪长岩的热年代学分析，剖析了青藏高原腹地构造－热事件与构造－地貌演化过程。结果表明，青藏高原腹地自中生代中、晚期以来发生4期重大区域性构造－热事件，包括121－116Ma沿班公－怒江缝合带发生的强烈中酸性岩浆侵位事件、93－45Ma沿雅鲁藏布江缝合带北缘发生的强烈中酸性岩浆侵位事件和随后发生于78－40Ma的快速隆升事件、25－15Ma沿冈底斯构造－岩浆带发生的强烈构造隆升事件及8－6．5Ma以来在拉萨地块中部发生的区域性伸展裂陷－差异隆升事件。区域性剥蚀夷平事件主要发生于40－25Ma与15－8Ma，区域性整体隆升主要发生在中新世早、中期即25－8Ma，区域性伸展裂陷与差异升降事件的开发时代约为8－6．5Ma。 |
| 关 键 词： | 青藏高原腹地 岩体热历史 构造－地貌演化 热年代学分析 |
| 修稿时间： | 2000年9月25日 |
Thermal-Chronological Dating on the Thermal History of Plutons and Tectonic-Landform Evolution of the Central Tibetan Plateau |
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| WU Zhenhan,JIANG Wan,ZHOU Jirong,LI Jixiang Institute of Geomechanics,CAGS,Beijing, Geological Publishing House,Beijing,.Thermal-Chronological Dating on the Thermal History of Plutons and Tectonic-Landform Evolution of the Central Tibetan Plateau[J].Acta Geologica Sinica,2001,75(4):468-476. | |
| Authors: | WU Zhenhan JIANG Wan ZHOU Jirong LI Jixiang Institute of Geomechanics CAGS Beijing Geological Publishing House Beijing |
| Institution: | WU Zhenhan,JIANG Wan,ZHOU Jirong,LI Jixiang Institute of Geomechanics,CAGS,Beijing, Geological Publishing House,Beijing, Department of Earth Sciences,Syracuse University,Syracuse,NY |
| Abstract: | Typical plutons such as the Baingoin granite, the Xungmai granite, the Yangbajain granite, the Jaggang granodiorite, the Lhasa granit and the Quxu granodiorite are sampled and analyzed for thermal-chronological dating of tectonic events and uplift process of the central Tibetan Plateau. Four periods of regional tectonic-thermal events in 121 -116 Ma, 93 - 45 Ma, 25-15 Ma and 8-6. 5 Ma are identified, corresponding to plu-tonism of the Bangong-Nujiang suture zone, plutonism and uplifting of the Yarlung Zangbo suture zone, thrusting and uplifting of Gangdise tectonic belt and extensional faulting of the middle Lhasa Block respectively. The erosional surface and planation tops of mountains mainly formed in 40-25 Ma and 15 - 8 Ma. The central Tibetan Plateau uplifted in 25 - 8 Ma as a whole and began extensional breaking in 8-6. 5 Ma. |
| Keywords: | central Tibetan Plateau thermal history of pluton tectonic-landform evolution thermal-chronological dating |
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