NEW RESULTS AND MAJOR PROGRESSES IN REGIONAL SURVEY OF THE DARLAG-JIGZHI SHEETS

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.