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现代地质 ›› 2017, Vol. 31 ›› Issue (01): 11-19.

• 矿床学与岩石学 • 上一篇    下一篇

新疆阿尔泰凯勒克赛依铁矿地质特征、锆石LA-MC-ICP-MS U-Pb年龄及其意义

郭旭吉1(), 李彦2, 杨成栋3()   

  1. 1.新疆维吾尔自治区有色地质勘查局 706地质队,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.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
  • 收稿日期:2016-09-07 修回日期:2016-12-02 出版日期:2017-02-10 发布日期:2017-03-16
  • 通讯作者: 杨成栋,男,博士研究生,1987年出生,矿物学、岩石学、矿床学专业,主要从事金属矿床成矿作用研究。Email: ycd.198747@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:
    国土资源部公益性行业科研专项经费项目(201211073)

Geological Characteristics, Zircon LA-MC-ICP-MS U-Pb Age of Kailekesaiyi Iron Deposit in Altay, Xinjiang, and Their Geological Implications

GUO Xuji1(), LI Yan2, YANG Chengdong3()   

  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. Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources,Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2016-09-07 Revised:2016-12-02 Online:2017-02-10 Published:2017-03-16

摘要:

凯勒克赛依铁矿床是新疆阿尔泰唯一的小型镜铁矿床,赋存于一套变质火山-沉积岩系中,近矿围岩为白云母石英片岩,矿体呈层状,与地层产状一致,矿石具有块状、条带状、条纹状构造,矿石中金属矿物主要为镜铁矿(TFeO=87.349%~88.988%,TiO2=0~1.042%,Al2O3=0.036%~0.256%),矿化具有沉积特征。近矿围岩镜铁矿白云母石英片岩锆石LA-MC-ICP-MS U-Pb谐和年龄为(375.6 ± 0.6)Ma,限定成矿时代在376 Ma左右,即中泥盆世成矿,是阿尔泰为数不多的中泥盆世成矿作用的产物。同时也厘定含矿的变质火山-沉积岩系属中—晚泥盆世阿勒泰镇组,不是前人认为的早泥盆世康布铁堡组。

关键词: 铁矿床, 地质特征, 锆石U-Pb定年, 凯勒克赛依, 阿尔泰, 新疆

Abstract:

Kailekesaiyi iron deposit, the unique small specularite deposit in Altay, Xinjiang, occurs in a sequence of metamorphic volcanic-sedimentary rocks. The wall-rock is muscovite quartz schist, and the orebodies are stratiform and in accordance with the stratigraphic occurrence. The ores occur as massive, banded, and striped structures. Ore minerals are dominated by specularite (TFeO=87.349%-88.988%,TiO2=0-1.042%,Al2O3=0.036%-0.256%) with sedimentary characteristics. Zircons from the specularite muscovite-quartz schist yield a LA-MC-ICP-MS U-Pb concordant age of (375.6 ± 0.6) Ma, and constrained the ore forming age to the Middle Devonian (ca.376 Ma), suggesting that this deposit is one product of the few Middle Devonian mineralization in Altay. Meanwhile, the ore-bearing metamorphic volcanic-sedimentary rocks are dated to the Middle-Late Devonian Altay Formation, rather than the Early Devonian Kangbutiebao Formation which is considered by the previous scholars.

Key words: iron deposit, geological characteristic, zircon U-Pb dating, Kailekesaiyi, Altay, Xinjiang

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