| 路彦明.新疆东准双泉地区与韧-脆性剪切带有关的金矿成矿[J].地质与勘探,2010,46(Z1):1159-1167 |
| 新疆东准双泉地区与韧-脆性剪切带有关的金矿成矿 |
| Mineralization of Gold Deposits Related with the Ductile-Brittle ShearZone in the Shuangquan area, Eastern Junggar, Xinjiang |
| 投稿时间：2010-10-25 修订日期：2010-11-20 |
| DOI： |
| 中文关键词: 韧-脆性剪切带 流体 同位素 金矿 东准噶尔 |
| 英文关键词: ductile-brittle shear zone, fluid, isotope, gold deposit, eastern Junggar |
| 基金项目:国家科技支撑课题(编号:2007BAB25B02)和地质大调查项目(项目编码:1212010913028)联合资助。 |
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| 摘要点击次数: 1933 |
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| 中文摘要: |
| [摘要]区域成矿背景分析表明,东准噶尔卡拉麦里地区韧-脆性剪切带形成于陆-陆碰撞体制,
在330 ~265Ma 期间,受挤压伸展体制转换影响,先后经历了韧、脆性构造变形。对与韧-脆性剪切带有
关的金矿石英流体包裹体研究发现,包裹体以气液相为主,均一温度集中在160 ~ 240益,成矿流体盐度
为3. 55 ~4. 5wt%NaCl。成矿流体的氢、氧同位素组成表明成矿流体的水为变质成因水。金属硫化物硫
同位素啄34 S 值为3. 54 ~10. 68译,显然属于混染硫。黄铁矿包裹体氦氩同位素3 He/ 4 He 值为0. 18 ~2. 18
Ra,属幔壳混源。成矿年代学研究表明,双泉金矿成矿时代及控矿构造脆性变形时间为(269依9) Ma ~
(260依4)Ma,金初始富集时间在310Ma 前后,并得到含矿花岗斑岩U-Pb 同位素年龄的支持,该事件在
东准地区均有同位素年龄记录,是区域性的构造岩浆成矿流体热事件。上述资料表明,金矿成矿过程、
成矿流体性质等在时间、空间上严格受韧-脆性剪切构造变形带控制。 |
| 英文摘要: |
| Abstract:Analysis of regional metallgenic setting shows that the ductile-brittle shear zone was formed in a continental collision system at the Kal鄄
amaili area in eastern Junggar. During 330 ~265Ma, due to the effect of compression-extension, this zone experienced ductile and brittle tectonic deform鄄
ation successively. The study on gold-bearing quartz fluid inclusions related with the ductile-brittle shear zone reveals that inclusions are dominated by
gas-liquid phase with homogenization temperature concentrating in 160 ~240益and ore-forming fluid salinity 3. 55 ~ 4. 5 wt % NaCl. Hydrogen and
oxygen isotopic compositions of ore-forming fluid show that the water is metamorphism water. Sulfur isotopes( 啄34 S) of metal sulfide is 3. 54 ~10. 68译,
which apparently belong to contamination sulfur. 3He / 4He of inclusions in pyrite is 0. 18 ~218Ra, which is attributed to a crust-mantle mixed source.
Ore-forming chronology research shows that metallogenic epoch and ore-controlling brittle deformation time in the Shuangquan gold deposit are between
269依9Ma ~260依4Ma, initial enrichment time of gold is around 310Ma, which is supported by the U-Pb isotope age of minerogenic granite-porphyry.
These events have been recorded by the isotope age data in the eastern Junggar area, indicative of a regional hydrothermal event that accounts for tectonic
-magmatic ore-forming. The above analysis shows that the gold metallogenic processes and ore-forming fluid properties are well controlled by the ductile
-brittle shear deformation zone in both time and space. |
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