大兴安岭永新金矿床黄铁矿热电性特征及其指示意义

doi:10.13278/j.cnki.jjuese.20190153

摘要/Abstract

摘要： 永新金矿床位于大兴安岭东北部黑河—嫩江构造混杂岩带，是近年来在大兴安岭地区新发现的受构造带控制的大型蚀变岩型金矿床之一，其矿床成因和找矿预测的相关研究较少，许多地质问题还不清楚。为了给深部找矿提供依据，开展了永新金矿床黄铁矿热电性的研究，采用BHTE-6型热电仪，对从永新金矿床32个钻孔及探槽孔矿石样品中挑选出的3 200粒黄铁矿单晶进行了测试。结果表明，永新金矿床黄铁矿热电导型以N型为主，占比约99%，P型占比约1%，黄铁矿热电系数变化范围为-306.0~296.0 μV/℃。通过黄铁矿热电系数计算永新金矿床成矿温度为190.2~313.5℃，属于中低温型热液矿床。黄铁矿热电系数离散性、导型分布、剥蚀率变化梯度及矿物填图等均表明永新金矿床西北部深部仍具有很好的找矿前景。

关键词: 永新金矿床, 黄铁矿, 热电性, 剥蚀率, 成矿温度

Abstract: Yongxin gold deposit is located in the Heihe-Nenjiang tectonic melange belt in the northeast of the Great Xing'an Range, which is one of the newly discovered altered rock type gold deposit,and is controlled by the tectonic belt in this area. At present, there are few related studies on the genesis of the deposit and ore-prospecting prediction, and many geological problems are still unclear. This study on pyrite thermoelectricity in the deposit is to provide a basis for deep ore-prospecting. A total of 3 200 single crystal grains of pyrite ore samples from 32 drill holes were tested by the BHTE-6 type thermoelectric instrument,and the results show that the pyrite thermal conductance type is N type, which accounts for about 99%,and P type accounts for about 1%. The pyrite thermoelectric coefficient variation ranges from -306. 0 μV/℃ to 296.0 μV/℃. The ore-forming temperature of the Yongxin gold deposit calculated by the thermoelectric coefficient ranges from 190.2 ℃ to 313.5 ℃. The dispersion of pyrite thermoelectric coefficient, the distribution characteristics of conduction type, and the gradient of denudation rate and mapping of thermoelectric coefficient all indicate that the deep northwest part of Yongxin gold deposit still has a good prospecting potential.

Key words: Yongxin gold deposit, pyrite, thermoelectricity, denudation rate, ore-forming temperature

中图分类号:

P574

董娟, 李成禄. 大兴安岭永新金矿床黄铁矿热电性特征及其指示意义[J]. 吉林大学学报(地球科学版), 2021, 51(1): 95-106.

Dong Juan, Li Chenglu. Thermoelectric Characteristics of Pyrite from Yongxin Gold Deposit, Xing'an Great Range and Its Indicative Significance[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(1): 95-106.

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