云南东川稀矿山式铜铁矿床成矿物质来源的同位素示踪
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国土资源部云南东川铜矿科学基地研究资助项目(20091107-7);昆明理工大学创新团队资助项目


Isotopic tracing of the source of ore-forming materials of the Xikuangshan type ferro-copper deposit in Dongchuan, Yunnan Province
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    摘要:

    稀矿山式铜铁矿床是东川铜矿中一种重要的矿床类型,前人研究程度较深,但对矿床成因观点不一,为探讨其铜铁矿层的成因及成矿物质来源,对稀矿山式铜铁矿的硫氧同位素进行了测试,并对同位素数据进行了地球化学研究.结果表明,硫化物中的δ34S值变化较大(从-10.9‰至15.9‰,均值为0.455‰),根据δ34S值的不同可分为3种: ① 在±4‰之间(15件), 具陨石硫特征; ② ±(5~8)‰范围内(6件),受火山沉积作用影响; ③>10‰和≤-10‰范围内(2件), 说明硫源以岩浆作用(火山喷发)为主要来源,部分为海水硫酸盐及地层生物硫.稀矿山式铜铁矿床的碳具有幔源特征,指示有地幔物质参与成矿作用;磁铁矿δ18OV-SMOW值变化在1.3‰~9.8‰之间,均值4.875‰,组成特征则反映矿床属于火山喷流沉积成因.成矿物质主要来源于火山喷发,成矿作用与岩浆、海相化学沉积、海底热液等作用有关.

    Abstract:

    The Xikuangshan type ferro-copper deposit is an important deposit type in the Dongchuan copper mine. Although previous researchers made detailed investigations, the origin of this kind of deposit remains controversial. In order to probe into the genesis and sources of the ore-forming materials of its ferro-copper layer, the authors analyzed the O isotopic compositions of the Xikuangshan type ferro-copper deposit and studied its isotope geochemistry. The results show that the values of δ34S in sulfides (from -10.9‰ to 15.9‰, with an average of 0.455‰) can be divided into three groups: ① values between ±4‰ (15 pieces), with the characteristics of meteoritic sulfur; ② values in the range of ±(5~8)‰ (6 pieces), influenced by the volcanic sedimentation; ③ values in the range of >10‰ or ≤-10‰ (2 pieces), suggesting that sulfur came mainly from the rock magma (volcanic eruptions) and subordinately from seawater sulfate and stratigraphic biological sulfur. The carbon of the Xikuangshan type ferro-copper deposit has the characteristics of mantle-derived carbon, implying that mantle material participated in the ore-forming process. The δ18OV-SMOW values of magnetite change between 1.3‰ and 9.8‰, with an average of 4.875‰. The composition characteristics of O isotope indicate that the deposit belongs to the volcanic sedimentation-exhalation deposit. The main ore-forming source came from volcanic eruption, and the metallogenesis was connected with magmatic activities, marine facies chemical sedimentation and seafloor hydrothermal solution sedimentation.

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李元龙,胡煜昭,2013,云南东川稀矿山式铜铁矿床成矿物质来源的同位素示踪[J].岩石矿物学杂志,32(2):167~179. LI Yuan-long, HU Yu-zhao,2013,Isotopic tracing of the source of ore-forming materials of the Xikuangshan type ferro-copper deposit in Dongchuan, Yunnan Province[J]. Acta Petrologica et Mineralogica,32(2):167~179.

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  • 收稿日期:2012-09-29
  • 最后修改日期:2013-01-24
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