Genesis of Kanggur Gold Deposit in Eastern Tianshan Orogenic Belt, NW China: Fluid Inclusion and Oxygen and Hydrogen Isotope Constraints |
| |
| Authors: | Zhiliang Wang Neng Jiang Yitian Wang Jingwen Mao Jianmin Yang |
| |
| Institution: | Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China [e-mail: ];Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;With additional position at Faculty of Geosciences and Resources, China University of Geosciences, Beijing 100083, China |
| |
| Abstract: | Abstract. Primary fluid inclusions in quartz and carbonates from the Kanggur gold deposit are dominated by aqueous inclusions, with subsidiary CO2-H2O inclusions that have a constant range in CO2 content (10–20 vol %). Microthermometric results indicate that total homogenization temperatures have a wide but similar range for both aqueous inclusions (120 to 310C) and CO2-H2O inclusions (140 to 340C). Estimates of fluid salinity for CO2-H2O inclusions are quite restricted (5.9～10.3 equiv. wt% NaCl), whereas aqueous inclusions show much wider salinity ranging from 2.2 to 15.6 equivalent wt %NaCl.
The 6D values of fluid inclusions in carbonates vary from -45 to -61 %, in well accord with the published δD values of fluid inclusions in quartz (-46 to -66 %). Most of the δ18O and δD values of the ore-forming fluids can be achieved by exchanged meteoric water after isotopic equilibration with wall rock by fluid/rock interaction at a low water/rock ratio. However, the exchanged meteoric water alone cannot explain the full range of δ18O and δD values, magmatic and/or meta-morphic water should also be involved. The wide salinity in aqueous inclusions may also result from mixing of meteoric water and magmatic and/or metamorphic water. |
| |
| Keywords: | fluid inclusion oxygen isotopes hydrogen isotopes genesis of gold deposit Kanggur eastern Tianshan China |
|
|
