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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Nathan Cleven University of Waterloo OntarioCanada

The Wunugetushan porphyry cu-mo deposit is located in the Manzhouli district of NE China,on the southern margin of the Mesozoic mongol-Okhotsk Orogenic *** rings of hydrothermal alteration and cu-mo mineralization surround an Early-Middle Jurassic monzogranitic *** cu-mo mineralization is clearly related to the quartz-potassic and quartz-sericite *** Re-Os and groundmass Ar/Ar of the host porphyry dates indicate that the ore-formation and porphyry-emplacement occurred at 177.6±4.5 Ma and 179.0±1.9 Ma,***,the host porphyry of the deposit is characterized by strong LREE/HREE fractionation,enrichment in LILE,Ba,Rb,U,Th and Pb,and depletion of HFSE,Nb,Ta,Ti and *** Sr-Nd-Pb isotopic compositions of the porphyry display an varied initial (Sr/Sr)i ratio,a positiveε(t) values and high Pb/Pb,Pb/Pb and Pb/Pb *** data indicate that the magmatic source of the host porphyry comprised two end-members:lithospheric mantle metasomatized by fluids derived from the subducted slab;and continental *** infer that the primitive magma of the host porphyry was derived from crust-mantle transition *** on regional geology and geochemistry of the host porphyry,the Wunugetushan deposit is suggested to form in a continental collision environment after closure of the mongol-Okhotsk Ocean.

关键词： porphyry cu-mo deposit Concentric alteration and mineralization Isotope geochronology Geochemistry Mixing magma source mongol-Okhotsk Orogen

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Early Mesozoic tectono-magmatic activity and mineralization in Northeast China:evidence from Re-Os to U-Pb studies of the Taipingchuan porphyry cu-mo deposit in the Derbugan metallogenic belt

Early Mesozoic tectono-magmatic activity and mineralization ...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Lianchang Zhang Bingyu Gao Wenjun Li Zhiguang Chen Patrick Asamoah Sakyi Xindi Jin Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth Science University of Ghana

The Taipingchuan cu-mo deposit is a recently discovered large porphyry deposit located in the north of the Derbugan metallogenic belt of northeastern *** geochronological data of the deposit yielded a Late Triassic zircon U-Pb age of 202 ± 6 Ma from a granodiorite porphyry that hosts the cu-mo *** Re-Os isotopes of seven disseminated molybdenite samples yielded an isochron age of 200 ± 5 Ma with mean square of weighted deviates of 2.7,while those of seven veinlet molybdemte samples also produced an isochron age of 200.1 ± 2.5 Ma and mean square of weighted deviates of *** isochron ages show that a cu-mo mineralization event occurred at ca.200 *** on regional tectonic evolution,we propose that the Late Triassic cu-mo mineralization of the host porphyry in the Derbugan metallogenic belt was mainly associated with the subduction of the mongol-Okhotsk Ocean slab under the Ergun block,contrary to previous suggestion that it was related to the subduction of the Mesozoic Palaeo-Pacific plate.

关键词： Derbugan metallogenic belt porphyry cu-mo deposit zircon U-Pb age molybdenite Re-Os age continental margin mongol-Okhotsk Ocean

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Geology,Geochemistry and Zircon U-Pb Geochronology of Porphyries in the Dabate mo-cu deposit,Western Tianshan,China:Petrogenesis and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 530-544页

作者： DUAN Shigang ZHANG Zuoheng WANG Dachuan LI Fengming MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China School of Earth Science and Resources China University of GeoscienceBeijing 100083China Xinjiang Bureau of Geology and Mineral Resources Urumqi 830000China

The Dabate mo-cu deposit is a medium-sized porphyry-type deposit in the Sailimu Lake region, western Tianshan, China. We present the geology, geochemistry and zircon U-Pb geochronology of granite porphyries from the Dabate district with the intent to constrain their tectonic setting and petrogenesis. Porphyries in the Dabate district include granite porphyry I（gray white color with large phenocrysts）, granite porphyry II（pink color with small phenocrysts） and quartz porphyry. Granite porphyry II is the cu and mo ore-bearing granitoid in the Dabate deposit. LA-ICPMS zircon U-Pb analyses indicate that granite porphyry II was emplaced at 284.2±1.8 Ma. Granite porphyry I and II have similar geochemical features and are both highly fractionated granites：（1） They have high SiO2 content（70.93–80.18 wt% and 72.14–72.64 wt%, respectively）, total alkali（7.58–8.95 wt% and 9.35–9.68 wt%, respectively）, mafic index（0.95–0.98 and 0.93–0.94, respectively） and felsic index（0.79–0.94 and 0.89–0.91, respectively）;（2） They are characterized by pronounced negative Eu anomaly, ＂seagullstyle＂ chondrite-normalized REE patterns and ＂tetrad effect＂ of REE;（3） They are rich in Rb, K, Th, Ta, Zr, Hf, Y and REE, but depleted in Sr, P, Ti and Nb. The magma of granite porphyries in Dabate can be interpreted to have been generated by partial melting of the upper crust due to mantle-derived magma underplating in a post-collisional extensional setting.

关键词： porphyry cu-mo deposit post-collisional extension zircon U-Pb age petrogenesis Dabate Tianshan Proto-Tethys

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Re-Os geochronology of cu and W-mo deposits in the Balkhash metallogenic belt,Kazakhstan and its geological significance

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Geoscience Frontiers 2010年第1期1卷 115-124页

作者： Xuanhua Chen Wenjun Qu Shuqin Han Seitmuratova Eleonora Nong Yang Zhengle Chen Fagang Zeng Andao Du Zhihong Wang Key Laboratory of Neotectonic movement ＆ Geohazard Ministry of Land and Resources Beijing 100081 PR China Institute of Geomechanics Chinese Academy of Geological Sciences 11 Minzudaxue Nan Road-Beijing 100081 PR China National Research Center for Geoanalysis Beijing 100037 PR China Laboratory of Geological Formations K. Satpaev Institute of Geological Sciences Almaty 050010 Kazakhstan

The Central Asian metallogenic domain （CAMD） is a multi-core metallogenic system controlled by boundary strike-slip fault systems. The Balkhash metallogenic belt in Kazakhstan, in which occur many large and super-large porphyritic cu--mo deposits and some quartz vein- and greisen-type W-mo deposits, is a well-known porphyritic cu--mo metallogenic belt in the CAMD. In this paper 11 molybdenite samples from the western segment of the Balkhash metallogenic belt are selected for Re--Os compositional analyses and Re--Os isotopic dating. molybdenites from the Borly porphyry cu deposit and the three quartz vein-greisen W--mo deposits--East Kounrad, Akshatau and Zhanet--all have relatively high Re contents （2712--2772 μg/g for Borly and 2.267--31.50 μg/g for the other three W-mo deposits）, and lower common Os contents （0.670-2.696 ng/g for Borly and 0.0051--0.056 ng/g for the other three）. The molybdenites from the Borly porphyry cu--mo deposit and the East Kounrad, Zhanet, and Akshatau quartz vein- and greisen-type W-mo deposits give average model Re--Os ages of 315.9 Ma, 298.0 Ma, 295.0 Ma, and 289.3 Ma respectively. Meanwhile, molybde- nites from the East Kounrad, Zhanet, and Akshatan W-mo deposits give a Re--Os isochron age of 297.9 Ma, with an MSWD value of 0.97. Re--Os dating of the molybdenites indicates that cu-W-mo metallogenesis in the western Balkhash metallogeuic belt occurred during Late Carboniferous to Early Permian （315.9--289.3 Ma）, while the porphyry cu--mo deposits formed at ~316 Ma, and the quartz vein-greisen W--mo deposits formed at ~298 Ma. The Re--Os model and isochron ages thus suggest that Late Carboniferous porphyry granitoid and pegmatite magmatism took place during the late Hercy- nian movement. Compared to the Junggar-East Tianshan porphyry cu metallogenic belt in northwestern China, the formation of the cu-mo metallogenesis in the Balkhash rnetallogenic belt occurred between that of the Tuwu-Yandong in East Tianshan and the Baogutu porphyry cu

关键词： Re-Os geochronology Metallogenic age porphyry cu-mo deposit Greisen W--mo deposits Balkhash metallogenicbelt Kazakhstan

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