NEW RESULTS AND MAJOR PROGRESSES IN REGIONAL SURVEY OF THE DARLAG-JIGZHI SHEETS
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摘要:
建立了测区三叠系巴颜喀拉山群地层格架，恢复了盆地充填序列和大地构造背景，系统总结了盆地基本层序类型，分析了盆地沉积旋回和海平面变化规律; 新发现深水风暴岩沉积; 取得了较老的锆石年龄数据，认为巴颜喀拉盆地存在硬基底; 发现三条大型韧脆性剪切带，探讨了区域隆升历史; 进行了大比例尺南水北调西线工程环境地质研究。
Abstract:The major progress and achievements obtained in the geological survey within the extent of the 1: 250000 Darlag and Jigzhi Sheets include: 1) Established the stratigraphical framework of the Bayan har Group and made a detailed analysis of the basin sedimentary filling sequences and the tectonic setting discrimination. 2) Summarized the major types of basic sequences. 3) The depositional cycles and sea level variations of the Bayan har Basin are as same as that of southern Tibet and the Salt Range of Pakistan. 4) The deep water tempestite was recently discovered in Triassic flysch sediments. 5) The old age information of zircons from the Triassic granitoids shows that exists a "rigid basement" under the Bayan har Basin. 6) Three tenacity brittleness shearing belt have been discovered in this area; the uplift history of Qinghai-Tibet Plateau is discussed; made a detailed environmental geology study on the Project of South-North Water Transfer.
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Key words:
- Bayan har Basin /
- geological survey /
- Darlag Sheet /
- Jigzhi Sheet /
- Project of SouthNorth Water Transfer /
- flysch
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表 1 三叠系旋回层序(海平面变化)划分对比表
Table 1. The reference table of the Triassic cycle sequence (the sea level change) division
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