%0 Journal Article
%T Characteristics of Fluid Inclusions and Metallogenesis of Annage Gold Deposit in Qinghai Province, China
%A Jianqing Lai
%A Peijiao Ju
%A Jinjin Tao
%A Baorong Yang
%A Xiaoyun Wang
%J Open Journal of Geology
%P 780-794
%@ 2161-7589
%D 2015
%I Scientific Research Publishing
%R 10.4236/ojg.2015.511067
%X The Annage gold deposit is located at the
east part of the eastern Kunlun orogenic belt. The characteristics of ore-forming
fluids and metallogenesis were discussed by using fluid petrography,
micro-thermometry and hydrogen-oxygen isotope analysis. Three stages, namely
quartz-pyrite stage (A), quartz-polymetallic-sulfide stage (B) and
quartz-ankerite stage (C) were included in the hydrothermal process as
indicated by the results of this study. Inclusions developed in ore-bearing
quartz veins from stages A and B are of three types: aqueous inclusions (type
I), CO2-bearing inclusions (type II) and pure CO2 inclusions
(type III). All three types of inclusions, mainly type I, are presented in
stage A, having homogenization temperatures at 180กใC - 360กใC, and salinities
ranging from 0.53% to 21.44%. In addition to development of type I inclusions,
type II and III inclusions increase significantly in stage B, with
homogenization temperatures ranging from 160กใC to 330กใC, and salinities are
from 1.32% to 22.01%. Based on micro-thermometry, fluids in Annage deposit are
of H2O-NaCl-CO2 type
with medium-high temperature (140กใC - 395กใC) and medium-low salinity (0.53% -
22.01%). Results of hydrogen-oxygen isotope analysis show that ore-forming
fluid is mainly CO2-rich magmatic fluid, mixed with shallow
groundwater or metamorphic hydrothermal in the late mineralization stages.
Calculated metallogenic pressures are in the range of
%K Fluid Inclusions
%K Hydrogen-Oxygen Isotope
%K Ore-Forming Fluid
%K Metallogenesis
%K Annage
%K China
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=61398