Li Y.J.,Kunming University of Science and Technology |
Yu H.J.,Yunnan Bureau of Geological Survey |
Zhu J.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013
On the basis of systematic analysis of and research on KT5 orebody, via the special deposit-model software Surpac, with the theory of geostatistics, the mathematic-economical model of the deposit in the Yangla Copper deposit has been established. As a result, 3D visibility, dynamic delineation of orebody and calculation of reserves, dynamic query of data have been realized, a successful example has been set for the computer management of mining production and the reconstruction of traditional technology. © (2013) Trans Tech Publications, Switzerland.
Deng M.,Kunming University of Science and Technology |
Lin B.,Kunming University of Science and Technology |
Liang X.,No. 272 Geological Brigade of Guangxi |
Li W.,Yunnan Bureau of Geological Survey
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2014
Luziyuan Pb-Zn deposit is located in Zhenkang-Baoshan block, southern section of Sanjiang metallogenic belt. The ore bodies occur in a set of carbonate rock series of the ∈3s2, ∈3s3. They are bedded, lenticular and vein, strictly controlled by structure. A large number of skarn minerals are occur in ore bodies and their surroundings. The REE distribution patterns of marbles and ores are enriched LREE and apparent medium negative Eu anomaly and unobvious Ce anomaly. The REE distribution patterns of Skarn include weak negative Eu and unobvious Eu anomaly or inclined positive anomaly. The marble, skarn and ores have similar REE distribution patterns which are enriched LREE, and have apparent negative Eu and unobvious Ce anomaly. Through the analysis of REE characteristics of rock (ore), and in combination with deposit geological characteristics, suggests that the mineralization mainly occurs under the environment of relative reduction and its ore-forming materials are mainly sourced from the deep hydrotherm, and partly from the ore-hosting strata (∈3s2, ∈3s3). The research shows that the deposit hosted in the carbonate formation is a hydrothermal filling and metasomatic skarn-type Pb-Zn deposit obviously controlled by tectonics.
Deng M.,Kunming University of Science and Technology |
Xu R.,Kunming University of Science and Technology |
Wang F.,Kunming University of Science and Technology |
Sun B.,Yunnan Bureau of Geological Survey |
And 4 more authors.
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2016
I.uziyuan super-large Pb-Zn-Fe polymetallic deposit is a typical representative of the similar deposits located in Baoshan bloek. The ore bodies oeeur as statiform-like along the strata, and the ore-hearing wall-roeks are mainly skarns. 'Il>e geological, geophysical, geochemical prospecting and remote sensing interpretation evidences all showed that the concealed roek body existed in the deep. While the inferred hidden body and the accurate mineralization age hasn' t been found and obtained in the known deposit, thus the ore genesis still remains controversial. This research discovers that there is an obvious Symbiotic relationship between rhodonite and iron, lead-zinc, and copper ores. In addition, the amount and grain size of rhodonite gradually increase down the deep. All these phenomena ohserved in the deposit are of great significance for us to undeistand the origin of it. Major, trace, rare earth elements and H-0 isotope compositions of the rhodonite are studied in this paper, with the rults that the rhodonite mainly comprises SiO2 of 47. 01%∼ 48. 66%, Mn() of 34. 42% - 40. 19%, CaO of 7. 52% ∼ 8. 51 %, FeC) of 2. 85% ∼ 8. 76%, MgO of 0. 22% ∼ 0. 28%, and lower TiO2, and Al2O3. The incompatible elements (such as Li, Be, Sc, Zr, Bb, Sr) are not depleted, or weakly depleted in the rhodonite; while some compatible elements including Cr, (x>, and Ni are obviously depleted; the BFEs' total contents of both rhodonite and sphalerite are lower δDV.SH0W and δ18sOH20values of the rhodonite range from -81. l%c to -73.3%c, 5.4%c to 6. respectively, which are all plotted within magmatic waters' area on the 5l)v.S|,o∗ diagram. Y/Ho value of ore minerals is relatively identical to the surrounding Yanshanian granites such as Zhibenshan and Caojian. All of tlie above-mentioned features demonstrate that the metallogenic fluids of Luziyuan deposit are characterized by the deep magmatic hydrothermal solutions. Therefore, it is suggested that the luziyuan Pb-Zn-Fe polymetallic deposit is a distal-skarn type Pb-Zn deposit closely related to the concealed intermediate and acidic igneous rocks of Yanshan Period.
Li W.,Yunnan Bureau of Geological Survey |
Yin G.,Yunnan Bureau of Geological Survey |
Yu H.,Yunnan Bureau of Geological Survey |
Liu X.,Kunming University of Science and Technology
Acta Geologica Sinica | Year: 2014
The Xiangcheng-Luoji area is located in the conjunction of the southern part of the "Sanjiang" mineralization belt and the west margin of Yangtze craton. The geological studies were carried out to know the Indosinian large porphyry Cu polymetallic deposits. Recent studies revealed that the area existed in the superposition of Late Yanshanian acidic intrusive rock belt and developed Mo-Cu polymetallic mineralization where promising exploration results have been achieved. Through the systematic study of geochronology, formation age of the Renlin Mo-minieralization monzogranite is 81.7±1.1 Ma. Re-Os dating results concentrate on 82.34±1.2-88.27±1.23 Ma for the model ages of molbdenite of Tongchanggou Mo deposits, average age is 85 ± 2 Ma where seven data points constitute a good isochron which shows that they were the same period products of mineralization. Geochemical features shown that the rocks have a high content of SiO2 (66.59-77.36wt%), alkaline-rich (K2O=2.68-6.08wt%; Na2O=0.50-4.91wt%; K2O/Na2O ratios are 0.71-5.56, where average ratio of 1.89) and have aluminum-rich features (Al2O310.38-15.15wt%) with σ values less than 3.3. Which indicate that they belong to the high-K calc-alkali to shoshonite series. Geochemistry of Yanshanian intrusions shows that rocks are enrich in LREE with obvious negative δEu anomalies, enrichment of trace elements like, LILE elements (Rb, Th, Ba) with a relative loss of Ba, and loss of high field strength elements (Nb, Ta, P, Ti) and HREE elements. The granite genetic classification diagram shows that the granites belong to A-type granite and formatted in syn-collision tectonic environment. Meanwhile, the Yanshanian granites also inherited the characteristics of island arc environment which formed in the process of crustal melting caused by upwelling of asthenospheric substances in the extensional tectonic background. The process of partial melting existed substances from the deep (lower crust or upper mantle) which have been added. In the Xiangcheng-Luoji area, monzogranite and granodiorite porphyry bodies are widely developed Mo polymetallic mineralization, the deep porphyry mineralization have great potential for geological prospecting. © 2014 Geological Society of China.
Wang X.-S.,Chinese Academy of science |
Wang X.-S.,University of Chinese Academy of Sciences |
Bi X.-W.,Chinese Academy of science |
Leng C.-B.,Chinese Academy of science |
And 6 more authors.
Ore Geology Reviews | Year: 2014
The Sanjiang Tethyan Metallogenic Domain (STMD) is an important part of the Tethyan giant metallogenic belt. The Yidun Arc is a part of the STMD in the eastern Tibetan Plateau. Recently, four newly discovered Mo-Cu-(W) ore deposits related to granitic intrusions were found distributed along the north-south strike in the southern Yidun Arc, which are identified as the Xiuwacu, Relin, Hongshan, and Tongchanggou deposits herein. These four deposits formed along high-angle north-northwest or north-west strike-slip faults, with vein-type and porphyry-type Mo-Cu mineralization developed in the intrusions. Molybdenite Re-Os and zircon U-Pb dating together with zircon Hf isotopes and whole-rock geochemistry of the intrusions were studied to discern the relationship between mineralization and magmatism, metallogenesis, and tectonic settings. Molybdenite from skarn-type mineralization at the Hongshan deposit has a Re-Os isochron age of 81.2±2.6Ma (MSWD=1.3, n=5) consistent with previously published zircon U-Pb ages and Re-Os ages of porphyry-type Mo mineralization. These results indicate that the Hongshan is a Late Cretaceous porphyry-skarn Cu-Mo deposit. Zircon U-Pb ages of the granitic intrusions in the Xiuwacu, Relin, and Tongchanggou deposits varying from ~87.4Ma to ~82.7Ma. Combined with published molybdenite Re-Os age spectrum (~85Ma to ~81.2Ma), it is proposed that the Mo-Cu-(W) mineralization in the Shangri-La region is spatially, temporally, and probably genetically related to the Late Cretaceous granitic intrusions. The Relin, Hongshan, and Tongchanggou intrusions have high SiO2 (65.2-70.0wt.%), Sr (363-905ppm), Sr/Y (22-72), and La/Yb (37-69) ratios, and low Y (11.6-17.0ppm) and Yb (0.97-1.59ppm), which displayed adakitic affinities. Their low MgO (0.66-1.44wt.%), Mg# (25-46), variable negative zircon εHf(t) values (-7.9 to -2.3), and Proterozoic two-stages Hf model ages (TDM2=1.13-1.62Ga) suggest that they were probably dominantly derived from partial melting of thickened lower continental crust. According to the tectonic evolution of the Bangong Meso-Tethys Ocean during the Late Mesozoic, the Late Cretaceous igneous event and mineralization in the Yidun Arc likely formed under a late- or post-collision extensional environment, probably related to the collision between the Lhasa and Qiangtang terranes during the Late Cretaceous. © 2014 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).
Li W.,Yunnan Bureau of Geological Survey |
YlN G.,Yunnan Bureau of Geological Survey |
Yu H.,Yunnan Bureau of Geological Survey |
Lu Y.,Yunnan Bureau of Geological Survey |
Liu X.,China Unwenty of Geosciences
Acta Petrologica Sinica | Year: 2011
The Geza volcanic magmatic arc in the south end part of Yidun island arc is characterized by Indosinian large scale intermediate-acid volcanic magmatic rock in NW zonal distribution. In this paper, we divide this magmatic rock zone into the west Lannitang-Chundu porphyry metallogenesis zone and the east Yaza-Pulang porphyry metsllogenesis zone according to the distribution, type, age, structural environment and metallogenesis, etc , of the volcanic magmatic rock and indicate the emplacement time of west porphyry zone is 15 ∼ 25Myr earlier than that of the east porphyry zone and the different metallogenesis characteristics of them. We propose that there is a Yanshanian superimposition of wide Mo (W, Cu) metallogenesis, Le., NS superimposition of S-type granite emplacement on the Indosinian island arc magmatic rock zone, outcropped or semi-buried, buried from N to S. Xiuwacu, Relin, Hongshan, Tongchanggou, etc. , many granite (porphyry) rock bodies have been outlined in Yunnan. The quartz veined type and altered rock type Mo metallogenesis is developed in the altered granite ( porphyry ) , whereas the hydrothermal veined type metallogenesis is along the fault zone and boundary surface between different rock in the wall rock. According to the previous study, the diagenesis ages of Xiuwacu and Relin are separately 84.4 ± 1.1Ma, 81.7 ± 1.1Ma; metallogenesis ages separately 83 ± 1Ma, 81.2 ± 2. 3Ma (after Li et al. , 2007 and Yin et al. , 2009). In our study, the molybdenite Re-Os isochron dating of deep buried rock body of Hongshan Cu orefield is 80.2Ma We think that the metallogenesis of Yanshanian rock body still shows the metallogenesis series of porphyry type Mo (Cu) deposit-→contact skam type Mo (Cu) deposit-→outer surrounding homfels Mo (Cu) deposit, hydrothermal veined Cu-Pb-Zn deposit, etc from inner to outer (from deep to shallow) of rock body. Therefore, we can carry out the vacancy prognosis based upon this metallogenesis series and guide the ore prospecting in the future.
Cai Z.,Chinese Academy of Geological Sciences |
Xu Z.,Chinese Academy of Geological Sciences |
Duan X.,Yunnan Bureau of Geological Survey |
Li H.,Chinese Academy of Geological Sciences |
And 2 more authors.
Acta Petrologica Sinica | Year: 2013
Field investigation, LA-ICP-MS zircon U-Pb dating and Hf isotope composition analysis applied in this paper show that: In mangshi area, southeastern margin of the Tibet Plateau, Ordovician conglomerate are unconformable on Cambrian and Pre-Cambrian metamorphic rocks. Zircon rim U-Pb age of the augen gneiss collected from Longjiang area is 518 ∼502Ma, representing the protolith granite crystallization time. The spectrum of U-Pb age for inherited zircons is similar with the Lhasa terrane, implicates that Tengchong terrane and Lhasa terrane belong to a unified continent during the early stage of Early Paleozoic. The feature of negative and large range of εHf(t) values (-15.7 ∼ -2.0) of zircon rims, combined with field obervition and petrographic study, shows that the protolith granite of the augen gneiss originated from old crustal injected by varing mantle components, may represent a part of a magmatic arc. Through field observations and zircon isotope analysis, we explicitly pointed to the existence of Early Palaeozoic orogenic event in southeastern margin of the Tibetan Plateau. Compared with the same period of tectonic events happened in Lhasa, Himalaya and Qiangtang terranes, we regard the Early Paleozoic orogenic belt in the southeastern Tibet Plateau is a part of the Andean-type Orogenic belt formed along the northern margin of Gondwana, provids new evidences for understanding the evolution of the Gondwana during Early Paleozoic.
Zhenhua Z.,Remote Sensing Center for Land and Resources |
Shufang T.,China University of Geosciences |
Wei D.,Yunnan Bureau of Geological Survey
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2012
Wetland is a versatile, rich biological diversity ecosystems on the planet which is one of the most important living environment of human beings. As the representative data of mid-resolution data, ETM data is widely used in Resources survey by its unique advantage in band set. Based on the analysis of water, terrestrial vegetation and aquatic vegetation's spectral characteristic, this article uses ratio composite method (ETM band3/band5(R) band2/band4(G)?band3/band7(B) to enhance water and wetland information combining with the band characteristics of ETM data. Practice has proved that this method has unique advantage in enhancing water and wetland information, and can improve the accuracy and efficiency in automatic Extraction of wetland information.