The Geological Characters And Mineralization Of Duocai Area In Zhiduo Country Qinghai Province

The region of interest in geostructure locate at the north section of Sanjiang structural belt, north edge of tanggulaensis metaplatform and central section of xijinwulan-yushu major fault, of which fold and fault development. Since Late Triassicm, the faulted depression as well as volcanic action intensely at the north edge of tanggula. Some deep faults control not only the distribution of stratum and magma but also the main pervium of mineral matter resource. The geologic condition of mineralization is advantageous.This paper is based on the one ratio fifty thousand survey of geology and mineral resources of DuoCai area in Zhiduo country QingHai province. A lot of means have been applicated such as field investigation, geophysical and geochemical exploration and so on. The new recognitions and progressions are concluded by the comprehensive research of its geological tectonic evolution and mineralization factors.(1) Two structural units were divided after comprehensive research and comparison of stratum, magmatite and structure. First the stratigraphic sequence of Batang Gr. and Gyiza Gr. was re-established and the volcanic eruption cycle and eruption rhythm was setup. Then the vulcanite rock series was confirmed and motile phases of magma was divided. Finally, volcanic eruption, magma intrusion surroundings and the origin and evolvement of magma was inquired.(2) The relationship of mineralization was discussed from stratum, litho and structure, from which we can make the conclusion that the porphyry body is favour of forming cupro and molybdenum deposits, volcanic rock is favour of forming polymetallic deposits.(3) The controlled factors were discussed and the foreground of this area was forecasted after studying the characters of stratum, rock mass and structure as well as the typical deposits comparison of Sanjiang area.