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下班啦   发表于 2018-7-19 22:04:23 |栏目:仪器资料 |分类:拉曼光谱
  • 资料类型 :应用方法 
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Ore-forming fluids associated with granite-hosted gold mineralization
at the Sanshandao deposit,Jiaodong gold province, China
Abstract The Sanshandao gold deposit, with total resources
of more than 60 t of gold, is located in the Jiaodong
gold province, the most important gold province
of China. The deposit is a typical highly fractured and
altered, disseminated gold system, with high-grade,
quartz-sulphide vein/veinlet stockworks that cut Mesozoic
granodiorite. There are four stages of veins that
developed in the following sequence: (1) quartz-K-feldspar-
sericite; (2) quartz-pyrite±arsenopyrite; (3) quartzbase
metal sulfide; and (4) quartz-carbonate. Fluid
inclusions in quartz and calcite in vein/veinlet stockworks
contain C-O-H fluids of three main types. The
first type consists of dilute CO2–H2O fluids coeval with
the early vein stage. Molar volumes of these CO2–H2O
fluid inclusions, ranging from 50–60 cm3/mol, yield
estimated minimum trapping pressures of ‡3 kbar.
Homogenization temperatures, obtained mainly from
CO2–H2O inclusions with lower CO2 concentration,
range from 267–375 C. The second inclusion type, with
a CO2–H2O±CH4 composition, was trapped during
the main mineralizing stages. These fluids may reflect
the CO2–H2O fluids that were modified by fluid/rock
reactions with altered wallrocks. Isochores for CO2-
H2O±CH4 inclusions, with homogenization temperatures
ranging from 204–325 C and molar volumes from
55 to 70 cm3/mol, provide an estimated minimum
trapping pressure of 1.2 kbar. The third inclusion type,
aqueous inclusions, trapped in cross-cutting microfractures
in quartz and randomly in calcite, are post-mineralization,
and have homogenization temperatures
between 143–228 C and salinities from 0.71–7.86 wt%
NaCl equiv. Stable isotope data show that the metamorphic
fluid contribution is minimal and that ore fluids
are of magmatic origin, most likely sourced from 120–
126 Ma mafic to intermediate dikes. This is consistent
with the carbonic nature of the fluid, and the crosscutting
nature of those deposits relative to the host
Mesozoic granitoid.

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sonicren

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sonicren   发表于 2018-8-27 21:25:39 |栏目:仪器资料
我帶著醬油瓶路過一起下吧的,還是忍不住小手一抖!

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zlzhc

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zlzhc   发表于 2018-9-9 16:30:41 |栏目:仪器资料
额,為神馬現在才發現一起下吧的資源啊[email protected][email protected]

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61KPejNU

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61KPejNU   发表于 2018-12-6 17:36:08 |栏目:仪器资料
这个資源一般般,不過我喜歡

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hxzy

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hxzy   发表于 2019-4-20 06:45:25 |栏目:仪器资料
珍惜生命,果断回帖;酌一杯清茶,品一起下吧资源

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