ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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Forming Conditions and Mechanism for the Fluid Ore-forming System of the Copper, Gold Deposits in the Middle and Lower Reaches of the Yangtze River Area

ZHOU Taofa, YUE Shucang   

  1. Department of Resources and Environmental Sciences, Hefei University of Technology, Hefei, 230009
  • Received:1999-06-16 Online:2000-09-20 Published:2000-09-20

Abstract: There are two series of Cu, Au deposits,the stratiformed deposits and the intrusive-related ones in the mineralization belt of the middle and lower reaches of the Yangtze River area. Comparative studies on forming geodynamic backgrounds, geological and geochemical conditions of the ore-forming systems have been undertaken in this paper. The stratiformed deposits were formed in Hercynian period by submarine exhalation-sedimentation (SEDEX) of hot brine through the synchronous basement faults in a tensional environmental, and the intrusive-related deposits were formed in Yenshanian in a tensional or a transitional period to tensional environment during the upper mantle doming by water-rock interaction and complex transport-chemical reaction dynamic processes, the ore-forming fluids were mainly magmatic water from melt-fluid partition and some meteoric water.