Xinjiang Laboratory of Mineral Resources and Digital Geology

Urunchi, China

Xinjiang Laboratory of Mineral Resources and Digital Geology

Urunchi, China

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Zhang Z.,Xinjiang Institute of Ecology and Geography | Zhang Z.,Xinjiang Laboratory of Mineral Resources and Digital Geology | Liu F.,Chinese Academy of Geological Sciences | Zhou K.,Xinjiang Institute of Ecology and Geography | And 4 more authors.
Scientia Geologica Sinica | Year: 2015

Tuchushan copper-iron deposit is a representative iron-polymetallic deposit in Yamansu Carboniferous fore-arc/arc belt of eastern Tianshan, the orebodies occurs as lenses, veins and stratums, which is hosted in volcanic rocks of the Upper Carboniferous Dikan'er Lower Formation. Homogenization temperature of fluid inclusions in skarn period vary from 151℃ to >380℃, salinity range from 1.91% to 23.18% NaCl equiv, density range from 0.76 g/cm3 to 1.09 g/cm3, and homogenization temperature of fluid inclusions in hydrothermal period vary from 101℃ to 280℃, salinity range from 0.35% to 23.05 % NaCl equiv, density range from 0.74 g/cm3 to 1.13 g/cm3, which have the characteristic of high-middle temperature, middle-low salinity and density, also belong to NaCl-H2O system.(Chlorite)-epidote skarn and magnetite-(specularite)ore have similar chondrite-normalized REE distribution patterns and are riched in LREE, is characterized by negative Eu anomaly and no Ce anomaly, also similar to volcanic of the Dikan'er Lower Formation, indicating that ore-forming material was derived from the volcanic. The authors hold that skarn might have resulted from volcanic hydrothermal interaction with cabonate and deposit was formed in high-middle temperature, comparatively wide oxidation-reduction environment. The genesis of mineral deposit is belong to volcanic hydrothermal metasomatic type. © 2015, Science Press. All right reserved.


Zhang Z.,Xinjiang Institute of Ecology and Geography | Zhang Z.,Xinjiang Laboratory of Mineral Resources and Digital Geology | Chai F.,Xinjiang University | Zhou K.,Xinjiang Institute of Ecology and Geography | And 3 more authors.
Scientia Geologica Sinica | Year: 2015

Tuchushan copper-iron deposit is hosted in volcanic rocks of the Upper Carboniferous Dikan'er Formation. The genesis of mineral deposit is belong to volcanic hydrothermal metasomatic type. Basalts in ore district are rich in aluminum and sodium, but loss potassium, phosphorus and titanium, indicating that the rocks are calc-alkaline volcanic rock series. The rocks are characterized by enrichment of light rare earth elements, large ion lithophile elements and loss of high filed strength elements. The characteristics of trace elements show that genesis of rocks are related to fluid of subduction, primary magmas have experienced crystallization differentiation of olivine or clinopyroxene and chromite, also suggest basalts and iron orebodies were formed in back-arc basin environment. LA-ICP-MS U-Pb zircon dating on diorite and moyite from ore district yielded concordant ages of 326.2±1.6 Ma and 318.2±2.5 Ma, indicating that they were formed in Carboniferous. Based on the contacting relation of diorite, moyite, iron orebody and volcanic rocks, we hereby confine the age of iron mineralization is similar to the forming time of volcanic rocks of the Dikan'er Formation, which is before the age of diorite(326 Ma), but the age of copper mineralization is appreciably later than 326 Ma. © 2015, Science Press. All right reserved.


Ye T.,Xinjiang Institute of Ecology and Geography | Ye T.,Xinjiang Laboratory of Mineral Resources and Digital Geology | Ye T.,University of Chinese Academy of Sciences | Li N.,Xinjiang Institute of Ecology and Geography | Li N.,Xinjiang Laboratory of Mineral Resources and Digital Geology
Scientia Geologica Sinica | Year: 2015

Laser ablation-inductively coupled plasma-mass spectrometer(LA-ICP-MS)is a newly-developed techniques for in situ trace element analysis of sulfides and oxides, offering high sensitives, low detection limit, and simultaneous capture of up to 20 trace elements. In this contribution, we review its application to gold deposit, and conclude that once combined with backscattered electron mode of scanning electron microscopy, X-ray elemental mapping, in situ sulfur/iron isotope analyses, pyrite LA-ICP-MS analysis can be used to determine the distribution of trace elements in pyrite, track their remobilization-transportation during deformation-metamorphism, probe into the composition and evolution the ore-forming fluids, determine potential sources of metals, depict detailed ore-forming processes, and constrain the genesis of ore deposits. © 2015, Science Press. All right reserved.

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