| 周炜坚,邵拥军,赵廉洁.湖南黄沙坪钨-钼-铜多金属矿床绿泥石特征及其地质意义[J].矿产勘查,2022,13(2-3):157-173 |
| 湖南黄沙坪钨-钼-铜多金属矿床绿泥石特征及其地质意义 |
| Characteristicsand geological implications of chlorite from the Huangshaping polymetallic deposit in Hunan Province |
| 投稿时间：2021-11-01 |
| DOI：10.20008/j.kckc.202203001 |
| 中文关键词: 绿泥石 电子探针 物理化学条件 地质意义 黄沙坪多金属矿床 |
| 英文关键词: chlorite electron microprobe physicochemical condition geological significance Huangshaping polymetallic deposit |
| 基金项目:本文受国家重点研发计划课题:岩浆热液演化与复合成矿模式(2018YFC0603901)资助。 |
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| 中文摘要: |
| 为探讨黄沙坪多金属矿床绿泥石的成矿意义,运用电子探针分析了黄沙坪矿床W-Mo矽卡岩(301#)和Cu矽卡岩(304#)两套成矿系统中从岩体至围岩各位置上石英-硫化物阶段形成的绿泥石。结果显示,301#系统的绿泥石主要为辉绿泥石和铁辉绿泥石,304#系统绿泥石主要为鳞绿泥石和鲕绿泥石,均为富铁绿泥石,指示形成于还原环境。两套系统绿泥石结构的离子置换主要为Fe对Mg的置换,反映其形成于富铁及相对酸性环境。由绿泥石地质温度计估算出301#系统绿泥石形成温度为301~468 ℃,属中-高温热液蚀变范围,而304#系统绿泥石形成温度为201~261 ℃,属中-低温热液蚀变范围。在成矿过程中,随着温度下降,热液流体的pH值逐渐降低。两套系统的绿泥石主要由溶蚀-迁移-沉淀结晶机制形成。绿泥石的形成过程与成矿热液的运移以及成矿元素的沉淀密切相关,是一种重要的找矿标志。 |
| 英文摘要: |
| In order to discuss ore-forming significances of chlorite of the Huangshaping polymetallic deposit, compositions of the chlorite in W-Mo-Sn skarn (named 301# system) and Cu skarn (named 304# system) mineralization systems has been analyzed by using electron microprobe in this paper. The chlorite in 301# system are mainly brunsvigite and diabantite, the chlorite in 304# system are mainly thuringite and chamosite. Both types of chlorite are Fe-rich chlorite, indicating a reducing environment during their formation. The phenomenon that Fe-Mg substitution dominates the octahedral substitution suggests that the formation of those chlorites had to do with iron-rich formation. According to the chlorite geothermometer, chlorites in 301# system were formed at temperatures of 301 to 468 ℃, indicating that the mineralization occurs under a high-medium temperature condition. Chlorites in 304# system were formed at temperatures of 201 to 261 ℃, indicating that the mineralization occurs under a low temperature condition. It is believed that the acidity of hydrothermal fluid decreases gradually with the decrease of temperature in the mineralization process of the deposit. The formation mechanisms of chlorites in two system were mainly dissolution-migration-crystallization. The formation of chlorite is closely related to the migration of ore-forming fluid and the precipitation of ore-forming elements, can be taken as an important indicator for prospecting mineralization. |
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