Geology of the Jiama porphyry copper–polymetallic system, Lhasa Region, China

Zheng, Wenjun; Tang, Juxing; Zhong, Kanghui; Ying, Lijuan; Leng, Qiufeng; Ding, Sheng; Lin, Bin

doi:10.1016/j.oregeorev.2015.11.024

Cited by 81 publications

(52 citation statements)

References 43 publications

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“…. 按照主要金属经济禀赋, 斑岩铜矿又可细分为斑岩Cu、Cu-Mo、Cu-Au及Cu-Mo-Au等几种亚类; 中国目前共有斑岩铜矿床70余个(图1), 主要为Cu-Mo、Cu-Au及Cu-Mo-Au亚类 [15] ; 不过, 一些有矽卡岩矿化的斑岩铜矿, 还含有Pb、Zn等金属(如甲玛 [40] ). 对于Cu、Mo及Au矿床规模, 尽管国外有较为流行的划分方案 [41] , 但中国有政府制定的严格标准(表S1), 本文将采用中国标准.…”

Section: 算为24万t 主要来自斑岩铜矿unclassified

Critical elements in porphyry copper deposits of China

Yang¹,

Hou²,

Zhou³

et al. 2020

Chin. Sci. Bull.

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Section: 算为24万t 主要来自斑岩铜矿unclassified

Critical elements in porphyry copper deposits of China

Yang¹,

Hou²,

Zhou³

et al. 2020

Chin. Sci. Bull.

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“…The fault structure controls the migration of hydrothermal fluids and controls the intrusion of magmatic rocks, which plays a vital role in mineralization. At present, porphyry copper (molybdenum) deposits, skarn-porphyry copper deposits and skarn copper deposits have been discovered in the study area [54,55]. Most of the known ore deposits are located near the faults, where the ore body (mineralization) is observably controlled by the structure (Figure 1).…”

Section: E~93mentioning

confidence: 99%

Application of a Maximum Entropy Model for Mineral Prospectivity Maps

Liu

Guo

et al. 2019

Minerals

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The effective integration of geochemical data with multisource geoscience data is a necessary condition for mapping mineral prospects. In the present study, based on the maximum entropy principle, a maximum entropy model (MaxEnt model) was established to predict the potential distribution of copper deposits by integrating 43 ore-controlling factors from geological, geochemical and geophysical data. The MaxEnt model was used to screen the ore-controlling factors, and eight ore-controlling factors (i.e., stratigraphic combination entropy, structural iso-density, Cu, Hg, Li, La, U, Na2O) were selected to establish the MaxEnt model to determine the highest potential zone of copper deposits. The spatial correlation between each ore-controlling factor and the occurrence of a copper mine was studied using a response curve, and the relative importance of each ore-controlling factor was determined by jackknife analysis in the MaxEnt model. The results show that the occurrence of copper ore is positively correlated with the content of Cu, Hg, La, structural iso-density and stratigraphic combination entropy, and negatively correlated with the content of Na2O, Li and U. The model’s performance was evaluated by the area under the receiver operating characteristic curve (AUC), Cohen’s maximized Kappa and true skill statistic (TSS) (training AUC = 0.84, test AUC = 0.8, maximum Kappa = 0.5 and maximum TSS = 0.6). The results indicate that the model can effectively integrate multi-source geospatial data to map mineral prospectivity.

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“…Porphyry Cu polymetallic deposits in Gangdese F I G U R E 1 (a) Tectonic framework of the Lhasa Terrane (modified from Zhu et al, 2011). (b) Geological sketch of the Gangdese metallogenic belt (modified from Yang et al, 2009) [Colour figure can be viewed at wileyonlinelibrary.com] mainly formed in a post-collisional crustal extension setting (Tang et al, 2012；Zheng et al, 2016Tang et al, 2019), but skarn Pb-Zn polymetallic deposits mainly formed in a syn-collisional setting Wang et al, 2015;Wang et al, 2016;Zheng et al, 2016).…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…In recent decades, many ore concentration areas have been discovered and evaluated in the Gangdese metallogenic belt under a national basic geological survey and enterprise exploration. Numerous porphyry copper deposits in the southern belt that has become China's important porphyry Cu polymetallic metallogenic belt, include collisionrelated porphyry deposits (e.g., Tinggong-Chongjiang Cu deposits, Qulong Cu (Mo) deposit, Jiama Cu polymetallic deposit, Bangpu Mo (Cu) deposit) (Tang et al, 2012;Tang et al, 2019;Yang et al, 2009;Zheng et al, 2016) and subduction-related porphyry deposits (e.g., Xiongcun porphyry Cu-Au deposit) (Lang et al, 2014), which constitute the Gangdese porphyry copper belt (GPCB). These deposits have become the focus of research (Tang et al, 2012;Tang et al, 2019;Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Zircon U–Pb geochronology, geochemistry, S–Pb–Hf isotopic compositions, and mineral chemistry of the Xin'gaguo skarn Pb–Zn deposit, Tibet, China

Tang

Wang

et al. 2019

Geological Journal

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The Xin'gaguo deposit is representative of the skarn Pb-Zn polymetallic zone in the northern Gangdese porphyry metallogenic belt, Tibet. Pb-Zn mineralization is hosted in the Take'na formation skarn. The Xin'gaguo ore-forming process can be divided into prograde skarn, retrograde skarn and quartz-sulfides. Skarn minerals include garnet, diopside, and epidote, with minor wollastonite, actinolite, and chlorite. Metallic minerals are mainly sphalerite, galena, chalcopyrite, magnetite, and pyrrhotite, with minor arsenopyrite, marcasite, native bismuth, cosalite, and gersdorffite. The LA-ICP-MS zircon U-Pb age of the diorite is 59.66±0.52 Ma. Diorite samples are characterized by fractioned REE patterns with marked positive Eu anomalies, enriched LILEs (Rb, Ba, Th, U, and K) and depleted HFSEs (Ta, Nb, Zr, Hf, and Ti), belong to the calcalkaline series and have metaluminous compositions. Zircon εHf(t) values of the diorite are positive (5.7-11) and lie between the chondrite and mantle values. These geochemical characteristics suggest that the diorite was formed by the partial melting of a young metasomatized asthenospheric mantle wedge deriving basaltic rocks. The δ 34 S values of sulfides range from −4.7 to 4.5‰ and show a bimodal distribution, indicating interactions of magma-derived ore fluid with biogenic sulfide minerals from the Take'na formation. The 206 Pb/ 204 Pb (18.5-18.629), 207 Pb/ 204 Pb ) of sulfides show that oreforming metals were derived from mixed sources, in part from the Lhasa Terrane basement. Skarn mineral compositions imply that the ore-forming environment was variable, and underwent at least three changes in oxidation-reduction state. The geochemical characteristics of diorite indicate that the Xin'gaguo deposit formed within the Indo-Asian continental collision tectonic setting.

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Geology of the Jiama porphyry copper–polymetallic system, Lhasa Region, China

Cited by 81 publications

References 43 publications

Critical elements in porphyry copper deposits of China

Critical elements in porphyry copper deposits of China

Application of a Maximum Entropy Model for Mineral Prospectivity Maps

Zircon U–Pb geochronology, geochemistry, S–Pb–Hf isotopic compositions, and mineral chemistry of the Xin'gaguo skarn Pb–Zn deposit, Tibet, China

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