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现代地质 ›› 2018, Vol. 32 ›› Issue (03): 415-428.DOI: 10.19657/j.geoscience.1000-8527.2018.03.01

• 矿床学与岩石学 • 上一篇    下一篇

河北撒岱沟门钼矿床成矿流体演化研究

吴迪1,2,3(), 江思宏1(), 刘源4, 张莉莉1, 康欢1, 刘家军2,5   

  1. 1.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
    2.中国地质大学(北京) 地球科学与资源学院,北京 100083
    3.武警黄金第一支队,黑龙江 牡丹江 157000
    4.中国石油大学(北京) 地球科学学院,北京 102249
    5.中国地质大学(北京) 地质过程与矿产资源国家重点实验室,北京 100083
  • 收稿日期:2017-12-25 修回日期:2018-02-22 出版日期:2018-06-10 发布日期:2018-06-28
  • 通讯作者: 江思宏
  • 作者简介:江思宏,男,研究员,博士生导师,1968年出生,矿物学、岩石学、矿床学专业,主要从事金属矿床成矿规律研究。Email:jiangsihong1@163.com
    吴迪,男,硕士研究生,1991年出生,矿物学、岩石学、矿床学专业,主要从事矿床地球化学方面的研究。Email:general_wudi@163.com
  • 基金资助:
    中国地质科学院基本科研业务费专项项目(YYWF201715)

Study on Evolution of Ore-forming Fluid in the Sadaigoumen Molybdenum Deposit, Hebei Province

WU Di1,2,3(), JIANG Sihong1(), LIU Yuan4, ZHANG Lili1, KANG Huan1, LIU Jiajun2,5   

  1. 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037,China
    2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083,China
    3. No.1 Gold Geological Party of Armed Police Force, Mudanjiang,Heilongjiang 157000,China
    4. School of Geosciences, China University of Petroleum, Beijing 102249,China
    5. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
  • Received:2017-12-25 Revised:2018-02-22 Online:2018-06-10 Published:2018-06-28
  • Contact: JIANG Sihong

摘要:

撒岱沟门钼矿床是华北地台北缘燕辽钼(铜)成矿带上典型的斑岩型钼矿床,位于河北省丰宁县境内,是该区目前发现的最大钼矿床。矿床成矿作用可划分为3期:成矿前(无矿石英脉阶段)、成矿期(①石英+磁铁矿+辉钼矿+黄铁矿+钾长石阶段,②石英+辉钼矿阶段,③石英+云母+辉钼矿+黄铁矿阶段,④石英+辉钼矿+黄铁矿阶段)、成矿期后(晚期无矿热液阶段)。对矿床流体包裹体的研究表明,撒岱沟门钼矿床主要发育两类包裹体:盐水溶液包裹体和含CO2三相包裹体。成矿前与成矿期后流体以气液两相的盐水溶液包裹体为主,对应的均一温度、盐度分别为248~296 ℃和6.0%~10.2% NaCleqv,以及130~197 ℃和0.2%~5.9% NaCleqv。成矿期两种类型包裹体均发育,均一温度和盐度主要集中在200~260 ℃和7.0%~17.5% NaCleqv。成矿流体中气相成分以CO2、H2O、N2为主,离子以Na+、Ca2+、NO3-和Cl-为主。氢、氧同位素研究表明,撒岱沟门钼矿床中石英的δD值为-88‰~-102‰,δ18$O_{H_{2}O}$值为-1.90‰~3.12‰,成矿流体属于以岩浆水为主的中低温中低盐度的CO2-H2O-NaCl体系。

 

关键词: 钼矿床, 流体包裹体, 显微测温, 拉曼光谱, 撒岱沟门, 河北

Abstract:

The Sadaigoumen Mo deposit is a typical porphyry Mo deposit in the Yan-Liao Mo(Cu) metallogenic belt on the northern margin of North China Block. Located in Fengning County, Hebei Province, the Sadaigoumen Mo deposit is the largest molybdenum deposit in this region so far. The Mo mineralization can be divided into three periods, which are pre-ore period (quartz vein stage without mineralization), the syn-ore period (including ①quartz+magnetite+molybdenite+pyrite+K-feldspar stage, ②quartz+molybdenite stage, ③quartz+mica+molybdenite+pyrite stage, and ④quartz+molybdenite+pyrite stage), and the post-ore period (late hydrothermal stage without mineralization). In order to explore the ore-forming mechanism of this Mo deposit, the study on ore fluid was carried out in this paper. There are two types of fluid inclusions in this deposit, which consist of two-phase vapor-liquid inclusions and CO2-bearing three-phase inclusions. The quartz from the pre-ore and post-ore periods are predominantly characterized by the two-phase vapor-liquid inclusions, which have the homogenization temperatures ranging from 248 to 296 ℃, 130 to 197 ℃, and the salinities varying from 6.0% to 10.2% NaCleqv, and 0.2% to 5.9% NaCleqv for the pre-ore and post-ore periods, respectively. During the syn-ore period, the two types of fluid inclusions are both developed in quartz, with the homogenization temperatures and salinities ranging from 200 to 260 ℃, and from 7.0% to 17.5% NaCleqv. Raman spectrum and inclusion groups components studies indicate that ore fluids are mainly composed of CO2, H2O,N2, Na+,Ca2+,NO3- and Cl-. The δD and δ18$O_{H_{2}O}$ values for quartz from ores vary from -88‰ to -102‰, and -1.90‰ to 3.12‰, respectively. Therefore, the ore fluid in the Sadaigoumen Mo deposit is a CO2-H2O-NaCl system dominated by the magmatic water in a medium-low temperature and medium-low salinity.

Key words: molybdenum deposit, fluid inclusion, microthermometry, Raman spectrum, Sadaigoumen, Hebei

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