Vein structure analysis and 40Ar/ 39Ar dating of sericite from altered rocks close to ore veins in Tieluping large-size Ag-Pb deposit of Xiong’ ershan area, western Henan Province
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    Abstract:

    Abstract The large Tieluping vein-type Ag-Pb ore deposit is located in western Xiongershan metamorphic core complex, south margin of North China Craton. The main Tieluping veins present a paragenesis that can be divided into four stages: an early Fe-Mg carbonates stage (I) prior to polymetallic mineralization, a smoky gray quartz-base metal sulphide - silver minerals stage (II1), a dolomite-white quartz - coarse grained galena - silver minerals stage (II2), and a calcedony-fluorite-calcite stage (III) after the polymetallic mineralization. The ore veins reactivated and reopened the pre-existing ductile shear zones in association with brecciation and open-space filling processes. Kinematic observations demonstrate that the structure of NE ore veins underwent a sinistral and normal motion, and that the structure of NW ore veins underwent dextral and normal motion, correspondingly. 40Ar/ 39Ar dating was performed on sericite from the altered rocks close to the ore veins, which yielded a plateau ages of (134.6 ±1.2) Ma and an isochronal age of (135.3 ±2.4) Ma. This age data corresponds to the sericite 40Ar-39Ar plateau age of (134.9±0.8) Ma for Haopinggou lead-silver veins and the zircon SHRIMP U-Pb age of (133.5±1.4) Ma for Haopinggou granite porphyry in the same ore field, thus further indicates the spatial and temporal consistency of the mineralization and intrusion.

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GAO Jianjing, MAO Jingwen, CHEN Maohong, YE Huishou, ZHANG Jijun, LI Yongfeng.2011. Vein structure analysis and 40Ar/ 39Ar dating of sericite from altered rocks close to ore veins in Tieluping large-size Ag-Pb deposit of Xiong’ ershan area, western Henan Province[J]. Acta Geologica Sinica,85(7):1172-1187

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History
  • Received:March 24,2011
  • Revised:April 08,2011
  • Adopted:July 18,2011
  • Online: July 18,2011