Volume 22 Issue 1
Mar.  2016
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LIU Nai-zhong, 2016. PHYSICAL-CHEMICAL CONDITIONS FOR MINERALIZATION OF THE QINSHAN IRON DEPOSIT IN DATIAN COUNTY, FUJIAN PROVINCE. Journal of Geomechanics, 22 (1): 39-47.
Citation: LIU Nai-zhong, 2016. PHYSICAL-CHEMICAL CONDITIONS FOR MINERALIZATION OF THE QINSHAN IRON DEPOSIT IN DATIAN COUNTY, FUJIAN PROVINCE. Journal of Geomechanics, 22 (1): 39-47.

PHYSICAL-CHEMICAL CONDITIONS FOR MINERALIZATION OF THE QINSHAN IRON DEPOSIT IN DATIAN COUNTY, FUJIAN PROVINCE

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  • Received: 2015-11-09
  • Published: 2016-03-01
  • Based on field investigation, the forming physical and chemical conditions of Qinshan iron deposit in Datian, Fujian were researched by fluid inclusions measurement and hydrogen and oxygen isotope. The homogenization temperature of fluid inclusions was 355.6 ℃, the salinity was 4.4%NaCl and the density was 0.65 g/cm3. Two peaks of homogenization temperature indicated that there were two stage of ore-fluid in the process of mineralization. The earlier stage was close related with the magnetite metallogenisis on the later skarn stage and the depth of about 3 km, the homogenization temperature was 400~420 ℃. The later stage was the Pb-Zn metallogenic stage and the depth of about 1 km, the fluid temperature was 240~280 ℃ and boiling. Raman analysis showed that the ore forming fluids contained little CO2 and CH4. The hydrogen and oxygen isotope data showed that the ore forming fluid mostly was derived from magma, and mixed with lot of meteoric water at later stage. Overall, the Qinshan Iron deposit was interpreted as a hydrothermal skarn deposit.

     

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