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Li N.,China University of Geosciences | Li N.,Chinese Academy of Geological Sciences | Xiao K.-Y.,Chinese Academy of Geological Sciences | Chen X.-Q.,Minmetals Exploration and Development Co. | Lou D.-B.,Chinese Academy of Geological Sciences
Geological Bulletin of China

Taking known deposit called Tanyaokou as an experimental region and based on the theory of wall rock alteration, study and experiment have been carried out on mineralization alteration extraction with hyper-spectral remote sensing image. Specifically, research is started with finding some indicative symbols based on alteration theory and studying spectrum features. Furthermore, pretreatment of EO-1 Hyperion imagery includes remove band lines, de-stripping, atmospheric correction and spectral reconstruction. Five end members have been extracted from inversion reflectance, which are used to mapping the study area using SAM method. Therefore, five alteration anomalies have been extracted. Besides, overlay analysis of hydroxyl anomaly information extracted from multi-spectral remote sensing imagery with alteration minerals distilled from hyper-spectral data in order to verify the correctness and feasibility of extraction, at last, repeatable technology processes of extraction for mineralization alteration using multi-source remotely sensed imagery have been established. Finally, according to geological setting and previous research about ore deposit especially on ore bearing stratum, the authors forecast other favorable target areas using alteration distribution map. The result reveals that extraction of anomalies agree with the ore-bearing strata, which shows practical meanings. Source

Jiang J.-H.,Chinese Academy of Geological Sciences | Jiang J.-H.,Minmetals Exploration and Development Co. | Wang R.-J.,Chinese Academy of Geological Sciences | Qu X.-M.,Chinese Academy of Geological Sciences | And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences

A series of NS-and EW-striking dykes occur in Bangong lake region, western segment of the Bangong lake-Nujiang suture in Tibetan plateau, including both granite porphyry and diorite porphyrite. Based on petrochemical analyses and zircon U-Pb LA-ICP-MS dating combined with field investigation, the present authors propose that these dykes represent a crustal extension event of the Bangong lake arc zone after the closure of Bangeng lake middle-Tethys oceanic basin. The granite porphyries occuring only in NS-strike and the diorite porphyrites occuring both in NS-and EW-strike respectively yield a weighted mean age of 79.59±0.32 Ma (MSWD=1.08) with 13 zircons and (76.9±1.2) Ma (MSWD=2.8) with 6. These results indicate that the crustal extensional process of the Bangong lake arc zone occurring in Late Cretaceous epoch was initialed only in EW-trending and slightly later also in NS-trending. Petrochemically, the two types of the dykes appear arc magmatic features characterized by enrichment of large iron incompatible elements (Rb, U, Th, K, Pb) and depletion of high field strength elements (Nb and Ti) which were attributed to metasomatism of Indian-MORB mantle by subducted sediment melt. Furthermore, by analyzing geochemical characteristics of the dyke, we come to the conclusion that the granite porphyries were generated at a shallower depth under amphibolite facies conditions, and the diorite porphyrites were probably under eclogite facies or garnet amphibolite conditions. And the amount of sediment melt involved in the mantle metasomatism related to diorite porphyrites varies largely from 1% to 10% with a source partial melting degree ranging from 8% to 15%. Whereas in the granite porphyries, the amount varies from 10% to 15% and their source partial melting degree is up to 15%. Source

Yao X.,University of Science and Technology Beijing | Hu N.,University of Science and Technology Beijing | Li G.,University of Science and Technology Beijing | Chen D.,Minmetals Exploration and Development Co.
ICSESS 2012 - Proceedings of 2012 IEEE 3rd International Conference on Software Engineering and Service Science

The multifunctional smart meter combined with ZigBee transmission module as network terminal, to achieve real-time collection of electricity, water, warm, wind and other energy consumed in the production process of mine, and then the data is transmitted to the PC Energy Management System to achieve dynamic data display, metering and billing statements, print and other functions; makes mining enterprises to timely understand the energy and material consumption of production operations, then maximize the utilization of energy and materials, to improve economic efficiency of enterprises. © 2012 IEEE. Source

Li Y.,University of Science and Technology Beijing | Hu N.,University of Science and Technology Beijing | Chen D.,Minmetals Exploration and Development Co.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

The price with large random fluctuation in mineral market has made it very difficult to do an accurate forecast. To overcome this problem, a multidimensional grey metabolism Markov forecasting method is proposed based on the theories of Grey forecast and Stochastic process. The forecasting effect of the model is tested through a case study and analysis with MATLAB software. The research results indicate that the forecasting precision of the proposed method is high and not limited to forecasting step length. So the method can be used to do a long term forecasting for mineral commodity prices without considering economic crisis. © 2012 Springer-Verlag. Source

Yang L.-Q.,China University of Geosciences | Deng J.,China University of Geosciences | Dilek Y.,China University of Geosciences | Dilek Y.,Miami University Ohio | And 7 more authors.

We report new whole-rock geochemical and Sr-Nd-Pb isotope and zircon U-Pb age and Hf isotope data of the Hongshan intrusive suite in the Triassic Yidun Terrane, eastern Tibet. These data allow us to explore the possible causative links between the magmatism and the coeval Cu-Mo mineralization in the region. The Hongshan intrusive rocks have SiO2 of 65.06-73.60 wt.%, K2O of 3.17-6.41 wt.%, and P2O5 of 0.11-0.39 wt.%, enriched in Rb, Th, and U, and depleted in Ba, Sr, P, Ti, Nb, and Eu. These rocks are of high-calc-alkaline to shoshonite series, showing geochemical signatures of metaluminous to slightly peraluminous I-type granite. Magmatic zircons separated from four samples yielded weighted mean 206Pb/238U ages of 79 ± 0.7 Ma, 78 ± 0.5 Ma, 77 ± 0.8 Ma, and 76 ± 0.8 Ma. Low MgO (0.42-1.47 wt%), low HREE and Y, varying εHf(t) (-9.5 to -2.2), and negative εNd(t) (-7.7 to -5.8) suggest that magmas of the late Cretaceous Hongshan plutons were most likely generated by partial melting and mixing of ~20% juvenile lower crust-derived melts, represented by the ca. 215 Ma basaltic andesite from the southern Yidun Terrane, with ancient basement-derived melts represented by the Baoshan S-type granitic melts from the Zhongza Block. We consider that partial melting processes are capable of removing chalcophile elements (such as Cu) and leaving siderophile metals (such as Mo) as residue in the lower crust of the Yidun Terrane, consequently inducing porphyry Cu-Mo mineralization. This consideration enables us to propose that the Triassic subduction-modified, copper-rich lithosphere was crucial for the giant copper mineralization that occurred in the Yidun Terrane during the late Cretaceous. Lithospheric-scale, transtensional faulting, developed as a result of collision-induced escape tectonics in SE Tibet, triggered asthenospheric upwelling, which in turn caused intra-plate extension and magmatism during the late Cretaceous, forming the Hongshan and coeval I-type granitoids within the Yidun Arc. © 2015 Elsevier B.V. Source

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