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现代地质 ›› 2015, Vol. 29 ›› Issue (6): 1309-1318.

• 矿床学 • 上一篇    下一篇

新疆阿尔泰薄克土巴依铁锰矿地质特征及成矿作用

郭旭吉1,李彦2,孔令湖3,郑佳浩4,孙东芊2   

  1. (1. 新疆维吾尔自治区有色地质勘查局706队,新疆 阿勒泰 836500; 2. 河北省地矿局探矿技术研究院,河北 三河 065201;3. 国土资源实物地质资料中心,河北 三河 065201; 4. 中国地质科学院 矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京 100037)
  • 出版日期:2015-12-24 发布日期:2016-02-29
  • 通讯作者: 郑佳浩,男,博士研究生,1987年出生,矿物学、岩石学、矿床学专业,主要从事矿床地球化学研究。 Email:joey-zen@163.com。
  • 作者简介:郭旭吉,男,高级工程师,1971年出生,矿产地质专业,从事矿产勘查及矿床学研究。 Email: guo-xuji@163.com。
  • 基金资助:

    国家科技支撑计划项目(2011BAB06B03-02)。

Geological Characteristics and Metallogenesis of the Boketubayi Iron-Manganese Deposit in Altay, Xinjiang

GUO Xu-ji1,LI Yan2,KONG Ling-hu3, ZHENG Jia-hao4,SUN Dong-qian2   

  1. (1. No.706 Geological Team, Xinjiang Nonferrous Geoexploration Bureau, Altay, Xinjiang 836500, China; 2. Institute of Prospecting Technology Research of Hebei Bureau of Geology and Mineral Exploration,Sanhe,Hebei 065201, China; 3. Territorial Resources Object Geological Information Center, Sanhe, Hebei 065201, China; 4. Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China)
  • Online:2015-12-24 Published:2016-02-29

摘要:

新疆薄克土巴依铁锰矿床赋存于下泥盆统康布铁堡组变质火山-沉积岩系中。本研究利用流体包裹体显微测温、氢和氧同位素以及年代学数据,探讨该矿床的成矿流 体性质及来源、成矿时代和成矿作用。结果表明,矿体呈层状,与地层产状一致,矿石具有块状、条带状、条纹状、细脉状和浸染状构造,矿化具有喷流沉积特征。成矿流体属中温(集中在200~320 ℃) 、低盐度(1.05%~4.49%)、中低密度的Na2O-H2O体系。重晶石的δD值为-129‰~-116‰,δ18O值变化于10.4‰~11.6‰,δ18OH2O值为5.7‰~10.3‰,表明成矿流体来自深循环的海水与岩浆水的混合。矿体围岩变质安山岩的锆石LA-ICP-MS U-Pb年龄为(398.8±1.3) Ma,限定成矿时代在399 Ma左右,即为早泥盆世成矿。

关键词: 铁锰矿床, 地质特征, 成矿作用, 薄克土巴依, 新疆阿尔泰

Abstract:

The Boketubayi iron-manganese deposit is hosted in metavolcanic-sedimentary sequence of the Lower Devonian Kangbutiebao Formation. Fluid inclusion microthermometry, H-O isotopes, and geochronological dating have been carried out to investigate the nature and source of oreforming fluids, mineralization age, and ore-forming mechanism of this deposit. Geological features of the deposit indicate that the ore body was layered, which is consistent with formation occurrence. In addition, massive, banded, striped, thin veins, and disseminated ores were observed in this study, suggesting the mineralization has exhalative-sedimentary characteristics. Fluid inclusions belong to medium-temperature (cluster between 200 and 320 ℃), low salinity (1.05% to 4.49%), and low-to medium-density Na2O-H2O system. Stable isotope analysis of barite yielded δD values of -129‰ to -116‰, δ18OSMOW values of 10.4‰ to 11.6‰, and δ18OH2O values of 5.7‰ to 10.3‰, respectively,indicating oreforming fluids derived from the mixing of deep circulation seawater and magmatic water. The LA-ICP-MS zircon U-Pb dating yielded an age of (398.8±1.3) Ma for ore-hosted metamorphic andesite, which indicates the ore forming age of Boketubayi deposit is around 399 Ma in Early Devonian.

Key words: iron-manganese deposit, geological characteristic, mineralization, Boketubayi, Altay,Xinjiang

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