Main achievements of 1∶200 000 regional geological mapping in B.Khon sheet of Laos
LI Zhenjiang1, LIU Shusheng2, WU Zhenbo2, JING Zhimin3, YOU Shuisheng1
1. Geological Survey Team of Sichuan Geology and Mineral Bureau, Chengdu 610213, China; 2. Chengdu Center of China Geological Survey, Chengdu 610081, China; 3. Geochemical Exploration Team of Sichuan Geology and Mineral Bureau, Deyang 618000, China
Abstract：1∶200 000 regional geological mapping in B.Khon sheet of Laos is a cooperation project between Chinese and Laotian governments. Methods of regional geological survey and regional geochemical survey were used in this project, the distribution and characteristics of regional strata, rocks, structures and minerals were identified, and a series of achievements and progresses have been made: ① The stratigraphic sequences and tectonic framework of the study area were systematically constructed, and 14 Carboniferous-Neogene lithostratigraphic units and 4 Carboniferous-Permian fusulinid fossil assemblage zones were newly established. ② The period of volcanic rocks in this study area is mainly Carboniferous, Early Permian and Middle Triassic. The Ph. Mokkalangkou deep-seated fault zone is part of the northward extension of the Nan-Uttaradit suture zone, in which the ultrabasic rocks may be the relicts of ophiolites. This achievement is of great significance to the stratigraphic and tectonic division of the study area and adjacent areas. ③ The characteristics and distribution of the structures in the study area are identified, 4 tectonic level and 4 tectonic units were divided, and six stages of tectonic evolution were pointed out. ④ Thirteen new Cu, Pb-Zn and Au mineralization points were found. And 24 integrated geochemical anomalies were selected according to the stream sediment survey. Ore-bearing bed, ore-forming geological background, metallogenic epoch and metallogenic regularity were systematically summarized. Four metallogenic prospecting areas were divided and the potential of superior mineral resources was preliminarily analyzed.
2018, Vol. 5 
