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现代地质 ›› 2023, Vol. 37 ›› Issue (02): 463-474.DOI: 10.19657/j.geoscience.1000-8527.2022.063

• 矿物学 • 上一篇    下一篇

河北丰宁银多金属矿床黄铁矿热电性特征及其指示意义

李玉洁1(), 李胜荣2(), 袁茂文2   

  1. 1.中国矿业联合会,北京 100029
    2.中国地质大学(北京)地球科学与资源学院,北京 100083
  • 收稿日期:2021-08-25 修回日期:2022-08-11 出版日期:2023-04-10 发布日期:2023-05-23
  • 通讯作者: 李胜荣
  • 作者简介:李胜荣,男,教授,博士生导师,1956年出生,矿物学、岩石学、矿床学专业,主要从事成因矿物学与找矿矿物学和环境与生命矿物学研究。Email:lisr@cugb.edu. cn。
    李玉洁,女,工程师,博士,1988年出生,矿物学、岩石学、矿床学专业,主要从事成因矿物学与找矿矿物学研究工作。Email:285315831@qq.com
  • 基金资助:
    国家重点研发计划项目(2016YFC0600106)

Thermoelectric Characteristics of Pyrite from the Fengning Ag Polymetallic Deposit, Hebei Province and Its Implications

LI Yujie1(), LI Shengrong2(), YUAN Maowen2   

  1. 1. China Mining Association, Beijing 100029, China
    2. School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2021-08-25 Revised:2022-08-11 Online:2023-04-10 Published:2023-05-23
  • Contact: LI Shengrong

摘要:

丰宁银多金属矿床位于华北克拉通北缘冀北成矿区内,是该地区重要的银多金属矿床之一。为了更好地探究矿床成因并进行矿区深部、外围找矿预测,对丰宁银多金属矿床牛圈银(金)矿区不同成矿阶段矿石中黄铁矿热电性标型特征进行了研究。结果表明该矿床黄铁矿热电系数变化范围为26~367 μV·℃-1,主要集中在200~330 μV·℃-1范围内,黄铁矿热电导型全部为P型,热电系数平均值为267 μV·℃-1。从1190 m到1110 m范围内约80 m的垂直空间内,热电系数变化梯度为0.74 μV·℃-1·m-1,变化梯度较小。综合来看,目前牛圈银(金)矿区所揭露的仅为浅部矿体,深部矿体还没有披露,并且矿体剥蚀较浅,深部尚有很大找矿远景。另外,利用黄铁矿热电系数与其形成温度的经验公式计算得出本区黄铁矿的形成温度范围为147~281 ℃,主要集中在180~280 ℃,与流体包裹体均一测温结果的变化范围基本一致,表明该矿床为中低温矿床。

关键词: 河北丰宁, 银多金属矿床, 黄铁矿, 热电性, 成矿温度

Abstract:

The Fengning Ag polymetallic deposit is one of the most important Ag polymetallic deposits located in northern Hebei metallogenic area, north margin of North China Craton. In order to better explore the genesis of the deposit and make predictions for deep and peripheral mineralization of the mining area, the thermoelectric typomorphism of pyrite in different mineralization stages of the Niujuan Ag (Au) mining area of the Fengning Ag polymetallic deposit was studied. The results show that the pyrite thermoelectric coefficient ranges from 26-367 μV·℃-1, mainly in the range of 200-330 μV·℃-1. The pyrite thermoelectric conductivity type is all P type, and the average value of thermoelectric coefficient is 267 μV·℃-1. The gradient of thermoelectric coefficient is 0.74 μV·℃-1·m-1 in the vertical space of about 80 m from 1,190 m depth to 1,110 m depth. In summary, only the shallow ore body has been disclosed in the Niujuan silver (gold) mining area, and the deep ore body has not been disclosed, and the erosion of the ore body is shallow, so there is a great prospect for deep ore prospecting. In addition, the pyrite formation temperature ranges from 147 ℃ to 281 ℃, mainly concentrated in 180 ℃ to 280 ℃, which is basically consistent with the variation range of fluid inclusion homogenization temperature measurement results, indicating that this deposit is a medium-low temperature deposit.

Key words: Fengning, Hebei Province, Ag polymetallic deposit, pyrite, thermoelectric, ore-forming temperature

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