陕西穆家庄铜矿床后生成矿作用的流体地球化学证据

朱华平; 李虹; 张德全; 刘平

陕西穆家庄铜矿床后生成矿作用的流体地球化学证据

1.
西北有色地质研究院, 陕西西安 710054;中国地质科学院矿产资源研究所, 北京 100037

2.
中国地质科学院矿产资源研究所, 北京 100037

3.
西北有色地质勘查局, 陕西西安 710054

收稿日期: 2003-01-27

修回日期: 2005-04-12

刊出日期: 2005-06-15

Evidences of the epigenetic mineralization processand geochemical features of Mujiazhuang copper deposit

1.
Northwest Geological Institute of Nonferrous Metals, Xi'an 710054, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

3.
Northwest Geological Exploration Bureau of Nonferrous Metals, Xi'an 710054, China

Received Date: 27 January 2003

Revised Date: 12 April 2005

Publish Date: 15 June 2005

摘要

摘要: 尽管秦岭泥盆系铅锌金多金属成矿带成矿作用均与热水喷流沉积作用有关,柞山地区却有别于凤太地区,具有独特的铜矿成矿背景。流体包裹体研究揭示了后生成矿流体的两阶段流体演化过程:第一阶段的成矿流体为中温,中高盐度岩浆热液含CO₂的NaCl-H₂O流体。均一温度为190～265℃,盐度12.5～35.34(wt%NaCl),压力12.8～21.3MPa,在同一寄主矿物中均一温度变化小,而盐度变化极大,是岩浆流体沸腾的产物;第二阶段成矿流体为中高温,中高盐度岩浆期后热液NaCl-H₂O流体。均一温度为300～350℃,盐度7.4～41.59(wt%NaCl),压力10.8～19.3MPa。反映了岩浆期后热液流体的二次沸腾。应用流体地球化学的综合方法(包裹体流体组成、演化)识别出后生交代流体性质。穆家庄铜矿的成矿流体第一阶段为岩浆水,第二阶段的成矿流体为岩浆水加部分地层水(建造水)。氢氧同位素分析也支持上述结论。
- 穆家庄铜矿 /
- 流体包裹体 /
- 氢氧同位素 /
- 后生成矿 /
- 陕西
Abstract: Although Qinling lead-zinc ores belt related to hydrothermal sedimentary, Zhashan area has more special copper metallogenic background than that of Fengtai area— geological setting, basal of basis. On the basis of fluid inclusions of the Mujiazhuang copper deposit, it is showed that there were two stages of fluid evolution. The first stage is magma hydrothermal with middle temperature, middle and high salinity(CO₂)-H₂O-NaCl fluid, which homogenization temperature are 190~265℃ and salinity 12.5~35.34(wt% NaCl),pressure 12.8～21.3MPa.Meanwhile,a large of three facies fluid inclusions with a salty crystal coexistence to vapour faices inclusions are discovered in the high and middle high temperature steps of homo temperature of fluid inclusions for the Mujiazhuang copper deposit.It is suggested that the mineralization fluid is over-saturation and o ccurring boilization and supposed that there is magma chamber in deep of mining area.
- Mujiazhuang copper deposit /
- fluid inclusions /
- H-O isotopes composition /
- epigenetic mineralization /
- Shaanxi province