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| Achievements of 1:50 000 regional geological survey in the east of Gaize area,Tibet |
| ZHU Lidong1, LI Zhiwu1, YANG Wenguang1, ZHANG Yuxiu2, TAO Gang1, HUANG Hui3 |
1. Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;
2. University of Chinese Academy of Sciences,Beijing 100049,China;
3. No.606 Party,Sichuan Bureau of Metallurgical Geology and Resources Development,Chengdu 611700,China |
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Abstract Based on the regional geological survey standard and technical requirements for major mineral zone,the east Gaize 1:50 000 regional geological survey project was carried out. The regional stratigraphic units, rocks, structure characters and metallogenic conditions were investigated from basic geology survey under the guidance of new mapping and modern metallogenic theory. Based on lithostratigraphic unit,focusing on the correspondence between litho-stratigraphic unit and bio-stratigraphic unit, and effectively utilizing multiple stratigraphic classification and correlation,such as cyclic stratigraphy and stratigraphy, the formation age and stratigraphic sequence of Mesozoic and Cenozonic strata were defined. It systematically summarized the basic sequence and constituent compositions and divided the Riganpeicuo Formation into two sets. The Mugagangri Group showed the characteristics of the sedimentary chaotic melanges and the Zhonggang ocean island was disassembled and volcanic-sedimentary sequence model was built. The first discovery of the eclogites and Quercus pseudosemicarpifolia provided important information for tectonic evolution of the Bangong Lake-Nujiang River and uplift of the plateau. The strata in the study area were divided into 3 structural layers,6 tectonic events since Mesozoic and 2 prospecting areas and 1ore prospecting target were found. We also systematically summarized four tectonic evolution stages of the Bangong Lake-Nujiang River, spreading and formation (about 242 Ma), subduction (Early Jurassic), metamorphic rocks exhumation (194 Ma), closure (110-85 Ma) and collisional orogeny.
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Received: 23 November 2016
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2017, Vol. 4 
