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现代地质 ›› 2015, Vol. 29 ›› Issue (6): 1296-1308.

• 矿床学 • 上一篇    下一篇

新疆西昆仑切列克其铁矿成因—地球化学及流体包裹体证据

曾威1,孙丰月2,赵财胜3,张雪梅4,段明1,俞礽安1,奥琮1   

  1. (1. 中国地质调查局天津地质矿产研究所,天津 300170; 2. 吉林大学地球科学学院, 吉林 长春 130061; 3. 国土资源部 科技与国际合作司,北京100812; 4. 天津地热勘查开发设计院,天津 300250)
  • 出版日期:2015-12-24 发布日期:2016-02-29
  • 通讯作者: 孙丰月,男, 教授, 博士生导师, 1963年出生,矿物学、岩石学、矿床学专业,主要从事热液矿床成矿理论与预测、区域成矿作用研究。Email:sfy@jlu.edu.cn。
  • 作者简介:曾威,男,工程师,1985年出生,矿产普查与勘探专业,主要从事矿床学研究与矿产勘查工作。 Email:314818431@qq.com。
  • 基金资助:

    中国地质调查局地质大调查项目(1212010630708,1212011220515,12120113068800)。

Genesis of Qieliekeqi Iron Deposit in West Kunlun, Xinjiang: Evidence from Geochemistry and Fluid Inclusions

ZENG Wei1, SUN Feng-yue2, ZHAO Cai-sheng3, ZHANG Xue-mei4, DUAN Ming1, YU Reng-an1, AO Cong1   

  1. (1. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China; 2. College of Earth Science, Jilin University, Changchun, Jilin 130061, China; 3. Technology and International Cooperation Department, Ministry of Land and Resources, Beijing100812, China; 4. Tianjin Geothermal Exploration and Development Designing Institute, Tianjin 300250, China)
  • Online:2015-12-24 Published:2016-02-29

摘要:

新疆切列克其铁矿位于西昆仑造山带南带,矿体呈层状、似层状产于志留系温泉沟组地层中。在对矿床地质特征进行研究的基础上,开展了详细的岩矿石地球化学及流体包裹体研究,探讨了切列克其铁矿的成因。切列克 其铁矿经历了2期成矿作用:早期为海底热水喷流成矿作用,是主要成矿期,主要形成层状、纹层状和条带状矿体,硅质条带中流体包裹体均一温度为140~160 ℃,盐度为4.79%~5.09%NaCl eqv,成矿 流体为低温低盐度流体;晚期为岩浆热液成矿作用,该期成矿作用造成了菱铁矿的活化迁移,形成了细脉状菱铁矿石,通过对含菱铁矿石英脉中包裹体的研究,可见气液两相、含子矿物三相和富气相3种类型包裹体,成矿流体包括中高温高盐度流体和中低温低盐度流体。

关键词: 西昆仑, 菱铁矿, 热水喷流, 流体包裹体, 地球化学, 新疆

Abstract:

Qieliekeqi iron deposit is located in the south belt of West Kunlun orogenic belt. Ore bodies occur as layer, layer-like in Wenquangou Formation. On basis of research on geological characteristics and combining with study of geochemistry and fluid inclusions, we propose that Qieliekeqi deposit mainly formed by hydrothermal exhalative process which formed bedded, lamellar and banded orebodies. The orebodies reformed by magmatic hydrothermal fluids at the later stage, which lead to the formation of veinlet coarse siderite. Homogenization temperature of fluid inclusions in siliceous bands ranges from 140 ℃ to 160 ℃, the salinity is 4.79%-5.09% NaCl eqv. Three types of fluid inclusions are recognized in quartz vein formed in post mineralization stage, which is vapor-liquid type, vapor-rich type and halite-bearing multiphase type.The ore-forming fluids are medium to high temperature with high salinity fluid and low temperature with low salinity fluid.

Key words: West Kunlun, siderite, hydrothermal exhalative, fluid inclusion, geochemistry, Xinjiang

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