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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. Source

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). Source

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. Source

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. Source

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. Source

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