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Liang Q.-Y.,Yunnan Nonferrous Metals Geological Bureau | Zhao Z.-H.,Sinopec
Journal of Chengdu University of Technology (Science and Technology Edition)

The Devonian-Permian organic reefs in the south of Guizhou are distributed widely. They can be divided into two types of platform margin reef and intra platform reef according to their ancient geographical positions of development. The scale of the platform margin reef is relatively large because the platform margin reef is controlled by the major rupture of the Yadu-Ziyun-Luodian of NW striking and the major rupture of the Shizong-Guiyang of NE striking crossing with it. The scale of the intra platform reef is generally small because the intra platform reef is controlled by partial uplifts (or fault blocks) underwater and influenced by the eustacy of sea level. The formation environment of the platform margin reef is mainly a middle-high energy while that of the intra platform reef is dominated by a low energy. The reef-building organisms are mainly Stromatopora, coral, lobate algae, sponge, etc. and they have differences in different developing periods and phases. The types of reef limestone have four types of framestone, bafflestone-framestone, framestone-bafflestone and bondstone. Recent researches indicate that the organic reef of Devonian-Permian in the depression in the south of Guizhou has preferable petroliferous property and presents the process of oil-gas migration and accumulation, having a favorable oil-gas exploration perspective. The study area is one of the key areas for seeking oil-gas reservoirs of organic reefs. Source

Li W.-C.,Kunming University of Science and Technology | Wang J.-H.,Kunming University of Science and Technology | He Z.-H.,Yunnan Gold and Minerals Group Co. | Dou S.,Yunnan Nonferrous Metals Geological Bureau
Ore Geology Reviews

The Beiya gold deposit is located in the central part of the Jinshajiang-Honghe strike-slip belt, at the junction zone of the Tethys-Himalaya orogenic belt and the Yangtze plate in SW China. This large-scale (125.6. million. metric. tonnes with a mean grade of 2.42. g/t) Au-rich polymetallic deposit is related to alkaline porphyry intrusions. Previous studies show that the Beiya alkaline porphyry intrusions are the fractionation product of a mantle-derived magma emplaced in an extension environment at the post-collision stage of the India-Eurasian plate collision; the Beiya deposit is considered to be skarn-related. Based on detailed field studies and previous work, we propose that the Beiya porphyry and associated Au-rich polymetallic ores were formed by the emplacement of magmas within the Jinshajiang-Honghe strike-slip fault during the late stage of the India-Eurasian plate collision at 45-25. Ma.At Beiya, the mineralized zones in the Cu-Au-rich porphyries are surrounded by Au-Cu-Fe skarns and Au (Cu) veins. Pb-Zn-Ag-rich mineralization was derived from the inner porphyry, and is widely developed outside the central alkaline-rich porphyry.The sulfur isotope signature of the sulfide mineralization in the Beiya and Qinhe deposits is -2.40‰-4.50‰ and 1.25-2.75‰, respectively. These values are close to 0‰, indicating that the sulfur may be mantle-derived. The δ18O compositions of the ore-forming fluids responsible for the formation of calcites at Qinhe are 8.10‰-9.61‰, which is lower than that of Beiya (δ18O=10.5‰) where the ores contain a larger contribution of oxygen from the mantle. The Beiya porphyry magmas provided fluids and the heat that drove the transport of the metals to the site of deposition.Alkaline porphyries are widely distributed throughout the Jinshajiang-Honghe strike-slip fault belt, and they are potential hosts to future discoveries of Beiya-style mineralization. © 2015 Elsevier B.V. Source

Li J.-S.,Kunming Institute of Exploration | Li G.-D.,Yunnan Nonferrous Metals Geological Bureau | Zhang Y.-X.,Kunming Institute of Exploration | Zhang X.-F.,Kunming Institute of Exploration | Wang C.,Kunming Institute of Exploration
Acta Geoscientica Sinica

Based on an analysis of ore-forming geological background and geological characteristics of the Shanmuqing Fe-Cu deposit in Dongchuan of Yunnan Province and using the information in such aspects as the metallogenic conditions of Fe-Cu deposit of Dongchuan model, the Xikuangshan model of the neighboring area, the dome structure, the gravity-magnetic anomaly, the geochemical anomaly and the mineralization, in combination with the newest results in geological exploration of Yunnan Province, the authors analyzed and studied the ore-prospecting potential of the exploration area. Considering that its metallogenic characteristics and geophysical-geochemical anomaly are similar to those of the Luoyin Fe-Cu ore belt, the authors delineated two gravity-magnetic anomaly belts of Linggongli-Xiaopo and Erbaier-Xinzhai and their nearly areas as prospecting targets. It is inferred that there exists great prospecting potential in search for middle-large ore bodies at the depth. Source

The strengthening of China-Myanmar strategic cooperation in the aspect of geological work and mineral exploration and development is of important significance for the continuous, healthy and stable development of China-Myanmar overall strategic cooperation partner relationship and the promotion of the 'bridge tower' construction of Yunnan Province. Based on an overall analysis of the basis, conditions, opportunities and challenges for the strengthening of China-Myanmar strategic cooperation in the aspects of geological work and mineral exploration and development, this paper put forward some ideas concerning the measures for the strengthening of China-Myanmar strategic cooperation in the aspects of geological work and mineral exploration and development, which include the basic train of thought, basic principles, main aim and main tasks for the cooperation in the near coming years. Source

Dou S.,Yunnan Nonferrous Metals Geological Bureau | Dou S.,Central South University | Zhou J.,Chinese Academy of science
Chinese Journal of Geochemistry

The Pb-Zn metallogenic district in NW Guizhou Province is an important part of the Yunnan-Sichuan-Guizhou Pb-Zn metallogenic province, and also is one of the most important Pb-Zn producers in China. The hosting rocks of the Pb-Zn deposits are Devonian to Permian carbonate rocks, and the basement rocks are meta-sedimentary and igneous rocks of the Proterozoic Kunyang and Huili groups. The ore minerals are composed of sphalerite, galena and pyrite, and the gangue minerals are include calcite and dolomite. Geology and C-O isotope of these deposits were studied in this paper. The results show that δ13C and δ18O values of hydrothermal calcite, altered wall rocks-dolostone, sedimentary calcite and hosting carbonate rocks range from -5. 3‰ to -0. 6 ‰ (mean -3. 4‰) and +11. 3‰ to +20. 9 ‰ (mean +17. 2‰), -3. 0‰ to +0. 9 ‰ (mean -1. 3‰) and +17. 0‰ to +20. 8‰ (mean +19. 7‰), +0. 6‰ to +2. 5 ‰ (mean +1. 4‰) and +23. 4‰ to +26. 5 ‰ (mean +24. 6‰), and -1. 8‰ to +3. 9‰ (mean +0. 7‰) and +21. 0‰ to +26. 8‰ (mean +22. 9‰), respectively, implying that CO2 in the ore-forming fluids was mainly a result of dissolution of Devonian and Carboniferous carbonate rocks. However, it is difficult to evaluate the contribution of sediment de-hydroxylation. Based on the integrated analysis of geology, C and O isotopes, it is believed that the ore-forming fluids of these carbonate-hosted Pb-Zn deposits in this area were derived from multiple sources, including hosting carbonate rocks, Devonian to Permian sedimentary rocks and basement rocks (the Kunyang and Huili groups). Therefore, the fluids mixing is the main precipitation mechanism of the Pb-Zn deposit in this province. © 2013 Science Press, Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg. Source

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