太白山盆地新叶美和加谷矿床中与锌-铅成矿有关的火成岩研究

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2020-01-21 DOI:10.1111/rge.12230
Jieun Seo, S. Choi, Min-Ho Koo, C. Oh, In-Chang Ryu, G. Lee
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引用次数: 7

摘要

位于韩国太白山盆地的Shinyemi和Gagok矿床沿白垩系花岗岩类与朝鲜超群寒武系—奥陶系碳酸盐岩的接触带呈现铅锌矿化特征。Shinyemi矿是韩国最大的多金属矽卡岩型磁铁矿矿床之一,包括铁和铁-钼-锌矽卡岩以及锌-铜-铅替代矿床。两个矿床的白垩系成矿年龄相似,花岗岩类具有相似的矿物结构和成分,高度演化,侵位深度较浅。它们被归类为钙碱性I型花岗岩(磁铁矿系列),形成于火山弧。新叶美花岗岩和灰岩(SiO2 = 74.4 ~ 76.6 wt%和74.4 ~ 75.1 wt%)的组分变化小于加谷花岗岩和灰岩(SiO2 = 65.6 ~ 68.0 wt%和74.9 ~ 76.5 wt%)。此外,SiO2 / K/Rb和SiO2 /Rb /Sr图解表明,新冶花岗岩类比加谷花岗岩类更为演化。新叶美花岗岩类在深部已经高度分化,然后侵入浅部,因此花岗岩和阿长石都表现出高度演化的相似化学成分。而古谷花岗岩分异程度较低,在晚期浅地层中分异为两期,花岗岩与长石组成不同。新叶美矿床中花岗岩与长石的含量相近,而加谷矿床中长石的含量低于花岗岩。因此,新叶美花岗岩类不仅在白云岩型镁质矽卡岩形成过程中富集了铁,而且还与新叶美矿床中的钼成矿作用有关。高谷矿床锌成矿主要由花岗岩而非长石引起。我们的数据表明,这两个矿床的矿化差异是由它们伴生的火成岩侵入体组成的差异造成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A study of igneous rocks related to Zn–Pb mineralization in the Shinyemi and Gagok deposits of the Taebaeksan Basin, South Korea
The Shinyemi and Gagok deposits, located in the Taebaeksan Basin, South Korea, display Zn–Pb mineralization along a contact between Cretaceous granitoids and Cambrian–Ordovician carbonates of the Joseon Supergroup. The Shinyemi mine is one of the largest polymetallic skarn‐type magnetite deposits in South Korea and comprises Fe and Fe–Mo–Zn skarns, and Zn–Cu–Pb replacement deposits. Both deposits yield similar Cretaceous mineralization ages, and granitoids associated with the two deposits displaying similar mineral textures and compositions, are highly evolved, and were emplaced at a shallow depth. They are classified as calc‐alkaline, I‐type granites (magnetite series) and were formed in a volcanic arc. Compositional variation is less in the Shinyemi granites and aplites (e.g., SiO2 = 74.4–76.6 wt% and 74.4–75.1 wt%, respectively) than in the Gagok granites and aplites (e.g., SiO2 = 65.6–68.0 wt% and 74.9–76.5 wt%, respectively). Furthermore, SiO2 vs K/Rb and SiO2 vs Rb/Sr diagrams indicate that the Shinyemi granitoids are more evolved than the Gagok granitoids. Shinyemi granitoids had been already differentiated highly in deep depth and then intruded into shallow depth, so both granite and aplite show the highly evolved similar chemical compositions. Whereas, less differentiated Gagok granitoids were separated into two phases in the last stage at shallow depth, so granite and aplite show different compositions. The amounts of granites and aplite are similar in the Shinyemi deposit, whereas the aplite appears in an amount less than the granite in the Gagok deposit. For this reason, the Shinyemi granitoids caused not only Fe enrichment during formation of the dolomite‐hosted magnesian skarn but also was associated with Mo mineralization in the Shinyemi deposit. Zn mineralization of the Gagok deposit was mainly caused by granite rather than aplite. Our data suggest that the variation in mineralization displayed by the two deposits resulted from differences in the compositions of their associated igneous intrusions.
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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