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The composition characteristics and origin of garnets in the Dongguashan skarn copper deposit, Anhui Province
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    Abstract:

    对安徽铜陵冬瓜山铜矿石榴石的地球化学特征进行了研究,并进行了成因探讨。野外调查及镜下观察发现,冬瓜山铜矿石榴石分为两期形成,第Ⅰ期石榴石环带发育,颜色较深,呈褐-棕黄色;第Ⅱ期石榴石呈他形-半自形穿切Ⅰ期,颜色较浅,呈浅黄-蜡白色,具非均质性。石榴石主量、稀土元素的等离子光谱(LA-ICP-MS)分析结果显示这两期石榴石有较大差别:第Ⅰ期石榴石钙铁榴石组分含量较高,可达94.14%,稀土元素配分模式为轻稀土元素富集、Eu正异常的右倾曲线;第Ⅱ期石榴石则相对富铝,钙铝榴石组分含量达44.06%,稀土元素配分模式为重稀土元素略微富集、Eu负异常的平缓曲线。这些特征表明,第Ⅰ期石榴石为岩浆成因,形成于较氧化环境;第Ⅱ期石榴石为热液交代成因,形成于较还原环境。

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郑震,杜杨松,曹毅,高志伟,杨爽,东前,2012,安徽冬瓜山矽卡岩铜矿石榴石成分特征及其成因探讨[J].岩石矿物学杂志,31(2):235~242. ZHENG Zhen, DU Yang-song, CAO Yi, GAO Zhi-wei, YANG Shuang, DONG Qian,2012,The composition characteristics and origin of garnets in the Dongguashan skarn copper deposit, Anhui Province[J]. Acta Petrologica et Mineralogica,31(2):235~242.

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  • Received:July 12,2011
  • Revised:August 27,2011
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