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Genesis of Kanggur Gold Deposit in Eastern Tianshan Orogenic Belt, NW China: Fluid Inclusion and Oxygen and Hydrogen Isotope Constraints
Author(s) -
Wang Zhiliang,
Jiang Neng,
Wang Yitian,
Mao Jingwen,
Yang Jianmin
Publication year - 2004
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2004.tb00198.x
Subject(s) - fluid inclusions , meteoric water , geology , quartz , salinity , geochemistry , magmatic water , inclusion (mineral) , metamorphic rock , mineralogy , isotopes of oxygen , hydrogen , aqueous solution , groundwater , chemistry , oceanography , paleontology , geotechnical engineering , organic chemistry
. Primary fluid inclusions in quartz and carbonates from the Kanggur gold deposit are dominated by aqueous inclusions, with subsidiary CO 2 ‐H 2 O inclusions that have a constant range in CO 2 content (10–20 vol %). Microthermometric results indicate that total homogenization temperatures have a wide but similar range for both aqueous inclusions (120d̀ to 310d̀C) and CO 2 ‐H 2 O inclusions (140d̀ to 340d̀C). Estimates of fluid salinity for CO 2 ‐H 2 O 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 δ 18 O 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 δ 18 O 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.