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Pan C.,Xinjiang 305 Project Office | Li Y.,Xinjiang 305 Project Office | Yan Q.,Xinjiang 305 Project Office | Ao S.,CAS Institute of Geology and Geophysics
Scientia Geologica Sinica | Year: 2010

Crust accretion and mineralization is the research on the frontier of economic geology. The eastern Tianshan orogenic belt is key part of the central Asia orogenic belt, its late paleozoic crust evolution has experienced subauction accretion, collision and large scale strike-slip, different stage has occurred many metal deposits. Copper-(nickel) deposits in the eastern Tianshan have been assigned to four major types according to the tectonic setting in which they formed. These are: 1) pre-accretionary late Devonian-early Carboniferous porphyry-type Cu-Mo-Au-Ag deposits; 2)early Carboniferou pre-accretionary VMS Fe-Cu-Pb-Zn massive sulfide deposits, 3) syn-to post-accretionary Late Carboniferous-Early Permian magmatic Cu-Ni-sulfide deposits; and 4) post-accretionary Late Carboniferous-Early Permian orogenic Au-Cu deposits. The geodynamics processes of these deposits is related to the crust horizontal and vertical accretions. The eastern Tianshan domain has been the one of the most important metal deposits provinces in China.

Chunming H.,CAS Institute of Geology and Geophysics | Wenjiao X.,CAS Institute of Geology and Geophysics | Chengze P.,Xinjiang 305 Project Office | Yuechen L.,Xinjiang 305 Project Office | And 7 more authors.
Scientia Geologica Sinica | Year: 2010

Located in the northern margin of the Zhungaer-Kazakesitan plate which this plate was collided with Trim plate, the Tuwu porphyry copper deposit is one of the important deposit in the well-known east Tianshan copper-concentrated region. Copper and copper mineralizations occur within the Late Devonian volcanic sequences of the Qi'eshan group. Sulfur isotopic analysis results reveal that sulfur of the ore fluids was mainly derived from deep sources, and the oxygen results reveal that magma was mainly derived from a mixed source of igneous rocks and upper crust rocks, it imply that the magma came from upper mantle, but was mixed with a small amount of crust material. Re-Os and Ar-Ar isotope dating show that copper deposit have two group ages, early Carboniferious (347.3±2.1 Ma) and middle Carboniferious (322.7± 3 Ma), Single-grain zircon U-Pb dating results suggest that granite-porphyry emplacement at least two times (358 -301 Ma), make-up the Devonian-Carboniferous Qi'eshan group of the island arc magmatic belt on the palaeogeographically margin between the Tarim plate and Zhungaer-Kazakesitan plate.

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