| 摘要: |
| 为了查明川西里伍铜矿黑云母的成因类型、形成的物理化学条件及成矿指示意义，本文对矿化蚀变带中的黑云母开展了电子探针分析。结果显示黑云母具有高SiO2（平均34.67%）、Al2O3（平均19.20%）、FeO（平均22.45%）、MgO（平均7.96%）、K2O（平均9.37%）特征，属于铁质黑云母。形成于低的氧逸度、中高温（平均531℃）、较大压力（平均3.99 kbar）与深度（平均深度为15.08 km）的环境。结合前人研究认为，里伍铜矿矿化蚀变带中的黑云母是原生黑云母重结晶改造而成，里伍式富铜矿床与江浪穹窿成穹过程中的变形-变质作用具有成因联系。 |
| 关键词: 黑云母 矿物化学 成矿意义 里伍铜矿 江浪穹窿 |
| DOI：10.19826/j.cnki.1009-3850(2020)01-0060-08 |
| 附件 |
| 投稿时间：2019-09-18修订日期：2020-02-10 |
| 基金项目:本文得到中国地质调查局成都地质调查中心项目（编号：CDG2019-KF-SK-001）、国家自然科学基金青年科学基金项目（编号：41902068）的联合资助 |
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| Chemical composition andmetallogenic significance of biotite from the Liwu copper deposit, western Sichuan Province |
| ZOU Wen1, LI Tongzhu2, GUAN Hua1, HE Lifu1, ZHANG Caisen1 |
(1. Jiulong Yalongjiang Mining Co., Ltd., Ganzi 626200, Scichuan, China;
2. Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China) |
| Abstract: |
| In order to ascertain the genetic type, physicochemical conditions and metallogenic significance, electron probe analysis of biotite in alteration zone of the Liwu copper deposit is carried out in this paper. The results show that these biotite grains: (1) have high SiO2 (average 34.67%), Al2O3 (average 19.20%), FeO (average 22.45%), MgO (average 7.96%) and K2O (average 9.37%) contents, and are primary iron biotite; (2) were formed in low oxygen fugacity conditions, medium to high temperature environment (average 531℃) and high pressure (average 3.99 kbar). Combined with previous data, it is believed that biotite in the Liwu copper deposit is probably formed by recrystallization of primary biotite, and the Liwu-type high-grade copper deposit is most likely related to the deformation-metamorphism during the doming process of the Jianglang dome. |
| Key words: biotite mineral chemistry metallogenic significance Liwu copper deposit Jianglang dome |
