蔡逸涛, 张洁, 康丛轩, 杨献忠, 曹正琦, 董钟斗, 马玉广, 施建斌. 安徽栏杆含金刚石基性岩中石榴子石矿物学特征[J]. 地质通报, 2019, 38(1): 110-120.
    引用本文: 蔡逸涛, 张洁, 康丛轩, 杨献忠, 曹正琦, 董钟斗, 马玉广, 施建斌. 安徽栏杆含金刚石基性岩中石榴子石矿物学特征[J]. 地质通报, 2019, 38(1): 110-120.
    CAI Yitao, ZHANG Jie, KANG Congxuan, YANG Xianzhong, CAO Zhengqi, DONG Zhongdou, MA Yuguang, SHI Jianbin. Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province[J]. Geological Bulletin of China, 2019, 38(1): 110-120.
    Citation: CAI Yitao, ZHANG Jie, KANG Congxuan, YANG Xianzhong, CAO Zhengqi, DONG Zhongdou, MA Yuguang, SHI Jianbin. Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province[J]. Geological Bulletin of China, 2019, 38(1): 110-120.

    安徽栏杆含金刚石基性岩中石榴子石矿物学特征

    Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province

    • 摘要: 在中国东部皖北地区分布着新元古代镁铁质岩,其中一些碱性基性岩为金刚石的赋矿岩石。为了确定安徽栏杆金刚石矿区的石榴子石种类,对矿区内不同类型的石榴子石进行系统采样,测定了62件石榴子石微区化学成分。结果显示,安徽栏杆石榴子石矿物化学式A32+B23+(SiO43中的A组阳离子由Mg2+、Fe2+和Ca2+离子占位,B主要由Al3+、Fe3+、Mn3+和Cr3+离子占位,三价阳离子主要为Al3+,二价阳离子主要为Ca2+,表明研究区石榴子石主要为钙铝-钙铁-镁铝石榴子石系列。在62个样品中,发现了超硅石榴子石。经过计算其形成的压力范围为12.1~12.8GPa,深度可达300km。

       

      Abstract: The mafic rock is exposed in northern Anhui Province, and some of them are diamondiferous rocks. In order to determine the type of garnets, the authors systematically sampled the garnets in diamondiferous basite in Lan'gan area. The MgO, SiO 2, FeO, TiO2, Al2O3, Cr2O3, CaO, MnO values of 62 single crystal garnets in this area were measured by electron microprobe spectrometer. The results show that the chemical formula of garnet group minerals is A32+B23+(SiO4)3. Group A cations are composed of Mg2+, Fe2+ and Ca2+. Group B cations are composed of Al3+, Fe3+, Mn3+ and Cr3+. The trivalent cation is mainly Al3+ while divalent cation is mainly Ca2+. It is inferred that grossularite-andradite-almandine group is the primary class in the Lan'gan area. The high calcium silicate iron garnet (majorite) was found in 62 samples. According to the composition of these majorities in Lan'gan area, the garnet of the diamondiferous basite has formation pressure of 12.1~12.8GPa, and the depth is up to 300km.

       

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