Yunnan Nonferrous Metals Geological Bureau

Kunming, China

Yunnan Nonferrous Metals Geological Bureau

Kunming, China
SEARCH FILTERS
Time filter
Source Type

Cui Y.-L.,Yunnan Nonferrous Metals Geological Bureau | Xu H.,Nonferrous Metals Geological Survey | Wang G.-H.,China University of Geosciences | Zhang W.-T.,China University of Geosciences
Acta Geoscientica Sinica | Year: 2017

The Feichijiao bauxite deposit in Qiubei City of Yunnan Province is a newly discovered large-size bauxite deposit. A study of major and trace elements and REE of the sedimentary bauxite ore (rock), underlying limestone and Emeishan basalts was carried out in this paper. The result shows that the major components are Al2O3, SiO2, TFeO and TiO2. The sedimentary bauxite ore (rock) is characterized by high iron, intermediate content of silicon and low aluminum. Al/Si ratios (Al/Si=0.69~5.19) and Al/Ti ratios (Al/Ti=5.01~29.47) of sedimentary bauxite ore (rock) are close to Al/Si ratios (Al/Si=0.65~1.33) and Al/Ti ratios (Al/Ti=3.53~14.32) of the underlying limestone respectively, and the linear relationship between basalts and bauxite ore (rock) is more significant on the Harker diagram of oxide, which indicates that the source of bauxite had multi-source characteristics, with the underlying limestone and basalt making some contribution. Trace element spider diagram shows that bauxite ore (rock) enrichment of HFSE (Th, Nb, Zr, Hf and Ti) is similar to that of the underlying Emeishan basalts. The bauxite ore (rock) spots are relatively concentrated in the basalt distribution area and its vicinities. REE patterns as well as ΣREE and Ce anomalies of bauxite ores are similar to those of basalts, and they display positive Ce anomalies, moderate Th/U ratios and high Sr/Ba ratios. The petrological, petrogeochemical and metallogenic backgrounds suggest that the sedimentary bauxite ore (rock) was formed by sedimentation in an oxygen-rich marine environment, and the underlying Emeishan basalt provided the major materials for the formation of bauxite ore (rock), with the underlying limestone contribution making insignificant contribution. © 2017, Science Press. All right reserved.


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 | Year: 2015

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.


Zhang D.-H.,Yunnan Nonferrous Metals Geological Bureau | Zhang X.-S.,Yunnan Nonferrous Metals Geological Bureau | Yang Y.,Yunnan Bureau of Geological Survey | Yan J.,Yunnan Nonferrous Metals Geological Bureau | Yang P.,Institute of Geology
Acta Geoscientica Sinica | Year: 2013

Along the alkali-rich porphyry belt on the western margin of the Yangtze platform, only a few medium-small size porphyry Cu-Mo deposits and medium-large size Pb deposits were previously found; nevertheless, quite a number of large, medium and small size Au (Ag) deposits have been discovered in recent years, which implies fairly good prospect in search for mineral deposits. The authors systematically collected and analyzed the achievements obtained by previous researchers, summed up such characteristics of alkali-rich porphyries in this area as petrology, petrochemistry, rock alteration, REE partitioning, inclusion geochemistry, stable isotopes and the difference between ore-bearing porphyries and barren ones. On such a basis, the authors hold that that the alkali-rich porphyries in this belt are composed mainly of alkali-rich granite porphyries and alkaline orthophyre, and belong to hypabyssal-ultrahypabyssal intrusive bodies of early-middle Himalayan period. The rocks have somewhat lower Si2O content and rich alkali and high potassium, similar to things of "A" type granites in Australia. The intrusive bodies have basically similar REE total content, LREE/HREE ratios and δEu values, and their REE pattern curves are all steeply right-oblique smooth curves, suggesting that the rock-forming and ore-forming materials were derived from the upper mantle and the lower crust; in addition, the magmatic evolution and genesis of the two types of alkali-rich porphyries show identity. Generally speaking, large size Cu, Mo, Pb, Zn, Au and Ag deposits are likely to be found in the intrusive bodies characterized by comparatively small size, complex shape, somewhat lower alkali, richness of ore-forming elements such as Cu, Mo, Pb, Zn, Au ang Ag and REE alkaline metallic elements like Li, Rb and Cs, varied alteration types, strong alteration, obvious zoning and somewhat higher REE total content (ΣREE).


Liang Q.-Y.,Yunnan Nonferrous Metals Geological Bureau | Zhao Z.-H.,Sinopec
Journal of Chengdu University of Technology (Science and Technology Edition) | Year: 2012

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.


Dou S.,Yunnan Nonferrous Metals Geological Bureau | Dou S.,Central South University | Zhou J.,Chinese Academy of science
Chinese Journal of Geochemistry | Year: 2013

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.


Chen B.-Y.,Yunnan Nonferrous Metals Geological Bureau | Liu H.-T.,Kunming Institute of Exploration | Yang P.,Institute of Geology | Sun Y.,Yunnan Nonferrous Metals Geological Bureau
Acta Geoscientica Sinica | Year: 2013

The global lateritic nickel ore deposits have distinct temporal and spatial distribution regularity, and the lateritic nickel ore bodies are characterized by apparent vertical zoning. The intensity of lateritic nickel mineralization is obviously influenced and controlled by the components of ore-forming parent rock (such as nickel content and lithogeochemical and mineral composition), climate, topography, hydrogeology, structural geology, duration of ore-forming process, and maturity of the weathering crust. Types of lateritic nickel ore deposits are mainly controlled by climate, tectonic setting and the state of structural uplift and also influenced by topography, drainage condition, lithology of ore-forming parent rock and its serpentinization.


Liang Q.-Y.,Yunnan Nonferrous Metals Geological Bureau | Liu W.-J.,Yunnan Nonferrous Metals Geological Bureau | Wang Y.,Yunnan Nonferrous Metals Geological Bureau
Acta Geoscientica Sinica | Year: 2013

Based on a study of metallogenic geological characteristics of the Laomeishan bauxite deposit, a typical bauxite deposit in central Yunnan, the authors hold that the bauxite deposits in this area are paleo-weathering crust sedimentary deposits controlled mainly by stratigraphic horizon, lithofacies-paleogeographical conditions, folded structure and late stage uplift and reformation. It is held that there exists certain exploration potential in this area.


Li G.-D.,Yunnan Nonferrous Metals Geological Bureau
Acta Geoscientica Sinica | Year: 2013

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.


Dou S.,Central South University | Liu J.-S.,Central South University | Guo Y.-S.,Yunnan Nonferrous Metals Geological Bureau | Yan J.,Yunnan Nonferrous Metals Geological Bureau
Acta Geoscientica Sinica | Year: 2013

The Luping lead polymetallic deposit in Heqing is a large-size concealed deposit discovered recently in Heqing, Yunnan Province. It is located on the northern side of the Beiya superlarge gold polymetallic deposit and is a component part and a new deposit type of the porphyry-hydrothermal ore-forming system of the Beiya superlarge gold polymetallic ore field. Based on a review of local geology and a comparative study of the mineralization characteristics of the Beiya deposit, the authors held that there should exist some unsubstantial structures in the axes of Beiya syncline which could provide the channel way and space for the ore-forming fluid from the Wandongshan orthophyre mineralization system. In combination with the existence of good combinatorial anomaly of Pb-Au-Ag-Zn-Cu-As-Sb in the area, the Luping lead polymetallic deposit was eventually discovered by means of drilling. The ore bodies of the deposit are hosted in the fracture zones within limestone of Middle Triassic Beiya Formation and sandstone-mudstone interlayered bedding of Qingtianpu Formation and limestone of Middle Triassic Beiya Formation. Ores of the ore deposit mainly consist of oxidized ores and mixed ores together with minor sulfide ores. The main metal component of the ores is lead along with some accessory components such as gold, silver, iron and zinc. Based on an analysis of the mineralogical characteristics as well as the distribution and modes of occurrence of useful components in the deposit, the authors put forward the suggestion that the relevant research work should be strengthened in further development and utilization of the ore deposit.


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 | Year: 2013

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.

Loading Yunnan Nonferrous Metals Geological Bureau collaborators
Loading Yunnan Nonferrous Metals Geological Bureau collaborators