蔡逸涛, 徐敏成, 施建斌, 杨献忠, 张洁, 康丛轩, 曹正琦, 董钟斗, 马玉广. 安徽栏杆含金刚石基性岩中辉石及钛铁矿矿物化学特征[J]. 地质通报, 2019, 38(1): 1-13.
    引用本文: 蔡逸涛, 徐敏成, 施建斌, 杨献忠, 张洁, 康丛轩, 曹正琦, 董钟斗, 马玉广. 安徽栏杆含金刚石基性岩中辉石及钛铁矿矿物化学特征[J]. 地质通报, 2019, 38(1): 1-13.
    CAI Yitao, XU Mincheng, SHI Jianbin, YANG Xianzhong, ZHANG Jie, KANG Congxuan, CAO Zhengqi, DONG Zhongdou, MA Yuguang. Mineral chemistry characteristics of clinopyroxene and ilmenite in basite of Lan'gan area, Anhui Province[J]. Geological Bulletin of China, 2019, 38(1): 1-13.
    Citation: CAI Yitao, XU Mincheng, SHI Jianbin, YANG Xianzhong, ZHANG Jie, KANG Congxuan, CAO Zhengqi, DONG Zhongdou, MA Yuguang. Mineral chemistry characteristics of clinopyroxene and ilmenite in basite of Lan'gan area, Anhui Province[J]. Geological Bulletin of China, 2019, 38(1): 1-13.

    安徽栏杆含金刚石基性岩中辉石及钛铁矿矿物化学特征

    Mineral chemistry characteristics of clinopyroxene and ilmenite in 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,岩石类型为辉绿岩、辉绿辉长岩、辉绿玢岩等。其中主要组成矿物为辉石、斜长石、角闪石、铁钛氧化物等。利用电子探针对单斜辉石和钛铁矿进行了详细研究。单斜辉石分析表明,其端元分子组成硅灰石分子(Wo)为33.27~43.04,顽火辉石分子(En)为38.79~46.63,斜方铁辉石(Fs)为10.45~24.83,属于普通透辉石。计算结果及化学成分比值说明,单斜辉石应该是在寄主碱性玄武质岩浆晚期低压下结晶的,可能是碱性玄武质岩浆浅位岩浆房晶出的产物。单斜辉石的结晶温度为1109~1206℃,压力最高为0.6GPa,相当于深部19.8km。栏杆地区钛铁矿含MgO和Cr2O3较低,具有富FeO,并含少量MnO的特点,属于含镁锰钛铁矿。两类矿物特征均与典型金伯利岩中的指示矿物不同。

       

      Abstract: Mafic rocks are exposed in northern Anhui Province. It consists of diabase, gabbro-diabase and diabase-porphyrite, and the minerals mainly include clinopyroxene, plagioclase, hornblende and Ti-Fe oxides. In this paper, clinopyroxene and ilmenite were studied in detail using microprobe. An analysis of clinopyroxenes shows that the end members are composed of wollastonite, enstatite and ferrosilite, belonging to augite. Calculation results and chemical analysis of ratios probably indicate that the fractional crystallizing products were formed by the relatively primary magma in shallower magma chambers. The crystallizing temperature of the clinopyroxenes are 1109~1206℃ and the highest pressure is 0.6 GPa, suggesting the depth of 19.8km. The ilmenite in Lan'gan area has low MgO and MnO, high FeO, and very low Cr2O3. The mineral characteristics of clinopyroxen and ilmenite are different from features of the index minerals in typical kimberlite.

       

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