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Geochronological and geochemical constraints on Aolunhua porphyry mo-cu deposit,northeast China,and its tectonic significance

Geochronological and geochemical constraints on Aolunhua por...

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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： Huaying Wu~(ab*),Lianchang Zhang~a,Bo Wan~(bc),Zhiguang Chen~(a,b),Xiaojing Zhang~a,b),Peng Xiang~(a,b) ~aKey Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,People’s Republic of China ~bGraduate University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China ~cState Key Laboratory of Lithosphere Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,People’s Republic of China

The Aolunhua porphyry mo-cu deposit is located in the northern margin of the North China Craton(NCC),and belongs to the northern part of the Xilamulun metallogenic *** than 90%of the mineralization occurs within the Aolunhua monzogranite-porphyry;a small part is hosted within quartz veins that crosscut Late Permian *** syenogranite,occurring as dikes and cutting through the Aolunhua monzograniteporphyry, is radially distributed in the mining *** U-Pb ages show that the Aolunhua monzogranite-porphyry and the post-ore syenogranite have concordant Pb/U ages of 138.7±1.2 Ma and 131.4±2.8 Ma,*** on analyses of major,trace elements and Hf-isotopes,the Aolunhua porphyry is characterized by high Sr low Y with high La/Yb and Sr/Y ratios typical of adakitic granites,whereas the post-ore syenogranite has lower Sr and higher Y values,showing apparently negative Eu anomalies (δEu=0.26 to 0.31).The Hf isotopic composition of the Aolunhua porphyry[ε(t)=+3.6to+9.2]and the post-ore syenogranite[ε(t)=+3.6 to+8.7]indicates that both juvenile crustal sources and depleted mantle contributed to their *** regional geological setting together with the discrepancy of geochemistry between the Aolunhua porphyry and the post-ore syenogranite probably indicates that they formed in different tectonic *** Aolunhua porphyry is derived from partial melting of the thickened crust due to underplating of the basaltic magma under the transformation tectonic regime,while the post-ore syenogranite comes from the crustal root melting during the lithospheric delamination stage under the lithosphere thinning regime of northeast China.

关键词： Zircon U-Pb dating porphyry mo-cu deposit Aolunhua Xilamulun metallogenic belt Northeast China

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U-Pb and Re-Os geochronology of the Haolibao porphyry mo-cu deposit,NE China:implications for a Late Permian tectonic setting

U-Pb and Re-Os geochronology of the Haolibao porphyry Mo-Cu ...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： QING-DONG ZENG YAN SUN XIAO-XIA DUAN JIAN-MING LIU Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

New gcochronologica]data for the Haolibao porphyry mo-cu deposit,NE China,yield Permian crystallization zircon U-Pb ages of 278±5 Ma for granite and 267±10 Ma for the granite porphyry that hosts the mo-cu mineralization,and four Re-Os tnolybdenite ages yield an isochron age of 265±3 *** ages disagree with the previous K-Ar age determinations that suggest a correlation of intrusive rocks of the Haolibao area with the Yanshanian intrusive rocks of Cretaceous *** mineralizations at the Haolibao area may be related to the tectonic-magmatic activity caused by collisional events between the North China Plate and mongolian terranes during the *** occurrence of the Haolibao plutonic rocks indicates that the Palaeo-Asian-mongolian Ocean closed during the Permian along the Xilamulun River suture.

关键词： U-Pb Re-Os Haolibao permian porphyry mo-cu deposit NE China

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Geology,Fluid Inclusion,and Sulfur Isotope Studies of the Chehugou porphyry molybdenum-Copper deposit,Xilamulun Metallogenic Belt,NE China

Geology,Fluid Inclusion,and Sulfur Isotope Studies of the Ch...

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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： Qingdong Zeng,Jianming LIU,Zuolun Zhang,Weiqing Zhang,Shaoxiong Chu, Song Zhang,Zaicong Wang and Xiaoxia Duan Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,the Chinese Academy of Sciences,Beijing,China

The Chehugou mo-cu deposit,located 56 km west of Chifeng,NE China,is hosted by Triassic granite ***-chalcopyrite mineralization of the deposit mainly occurs as veinlets in stockwork ore and dissemination in breccia ore,and two ore-bearing quartz veins crop out to the south of the granite porphyry *** on crosscutting relationships and mineral paragenesis,three hydrothermal stages are identified:(i) quartz-pyrite-molybdenite±chalcopyrite stage;(ii) pyrite-quartz±sphalerite stage;and(iii) quartz-calcite±pyrite±fluorite *** types of fluid inclusions in the stockwork and breccia ore are recognized:LV,two-phase aqueous inclusions(liquid-rich);LVS,three-phase liquid,vapor,and salt daughter crystal inclusions;and VL,two-phase aqueous inclusions(gas-rich).LV and LVS fluid inclusions are recognized in vein *** investigation of the three types of fluid inclusions in hydrothermal quartz from the stockwork,breccia,and vein ores shows salinities from 1.57 to 66.75 wt%NaCl equivalents, with homogenization temperatures varying from 114℃to 550℃.The temperature changed from 282-550℃, 220-318℃to 114-243℃from the first stage to the third *** homogenization temperatures and salinity of the LV,LVS and VL inclusions are 114-442℃and 1.57-14.25 wt%NaCl equivalent,301-550℃and 31.01-66.75 wt% NaCl equivalent,286-420℃and 4.65-11.1 wt%NaCl equivalent,*** VL inclusions coexist with the LV and LVS,which homogenize at the similar *** above evidence shows that fluid-boiling occurred in the ore-forming stage.δS values of sulfide from three type ores change from -0.61‰to 0.86‰.Theseδ340S values of sulfide are similar toδS values of typical magmatic sulfide sulfur(c.0‰), suggesting that ore-forming materials are magmatic in origin.

关键词： Chehugou NE China porphyry mo-cu deposit Xilamulun metallogenic belt

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