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    阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究

    熊发挥 杨经绥 徐向珍 郝晓琳

    熊发挥, 杨经绥, 徐向珍, 郝晓琳, 2018. 阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究. 地球科学, 43(5): 1464-1473. doi: 10.3799/dqkx.2018.405
    引用本文: 熊发挥, 杨经绥, 徐向珍, 郝晓琳, 2018. 阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究. 地球科学, 43(5): 1464-1473. doi: 10.3799/dqkx.2018.405
    Xiong Fahui, Yang Jingsui, Xu Xiangzhen, Hao Xiaolin, 2018. Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania. Earth Science, 43(5): 1464-1473. doi: 10.3799/dqkx.2018.405
    Citation: Xiong Fahui, Yang Jingsui, Xu Xiangzhen, Hao Xiaolin, 2018. Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania. Earth Science, 43(5): 1464-1473. doi: 10.3799/dqkx.2018.405

    阿尔巴尼亚布尔其泽纯橄岩壳中橄榄石的包裹体研究

    doi: 10.3799/dqkx.2018.405
    基金项目: 

    国家自然科学基金项目 41672046

    中国地质调查局工作项目 DD20160023

    国家自然科学基金项目 41641015

    行业基金项目 201511022

    国家自然科学基金项目 41502062

    国家自然科学基金项目 41541017

    详细信息
      作者简介:

      熊发挥(1985-), 男, 博士, 副研究员, 矿物学、岩石学、矿床学专业

      通讯作者:

      徐向珍

    • 中图分类号: P315

    Inclusions in Olivine and Implications-Based on Mineral Research of Dunite of Bulqiza Ophiolite, Albania

    • 摘要: 阿尔巴尼亚布尔其泽纯橄岩壳非常新鲜,主要由橄榄石、尖晶石和单斜辉石等矿物组成.其中橄榄石存在单斜辉石和铬尖晶石(磁铁矿)共生包裹体现象,包裹体矿物粒度在1~10 μm,有些甚至为纳米级200~500 nm.纯橄岩橄榄石的Fo值为94.7~96.0,铬尖晶石的Cr#为76.5~82.4,远高于蛇绿岩地幔橄榄岩中常见纯橄岩的铬值(Cr#>60).基于前人研究结果,提出这种现象是由于亏损方辉橄榄岩与含钛、铬、铁熔体发生交代作用,从而形成橄榄石的固溶体并存在Ti4+、Al3+、Ca2+、Fe3+,而部分Cr3+进入铬尖晶石结晶.后期由于岩体在抬升过程中降温,橄榄石中混溶的组分析出包裹体形成磁铁矿和铬尖晶石.并且依据铬尖晶石-橄榄石的矿物化学成分,识别出岩体内方辉橄榄岩相对较低的部分熔融程度约为30%~40%,纯橄岩部分熔融程度约为40%,表明不同岩相间其形成背景存在明显差异.因此,认为布尔奇泽蛇绿岩具有多阶段的过程,首先是在洋中脊环境下经历部分熔融作用形成了方辉橄榄岩,后受到俯冲环境(SSZ)的岩石-熔体反应生成更富Mg、Si和Cr等的熔体,致使地幔橄榄岩高度部分熔融,形成此类纯橄岩.

       

    • 图  1  特提斯蛇绿岩的地质简图

      Xiong et al.(2015)修编

      Fig.  1.  Geological map of Tethys ophiolites

      图  2  阿尔巴尼亚Mirdita蛇绿岩带东段布尔奇泽蛇绿岩的地质简图

      Xiong et al.(2015)修编

      Fig.  2.  Geological map of Bulqiza ophiolites in the eastern of Mirdita suture from Albania

      图  3  布尔奇泽蛇绿岩岩相野外照片

      a, b.纯橄岩壳与豆荚状铬铁矿共生照片;c.方辉橄榄岩;d.透镜状纯橄岩中新鲜的铬尖晶石

      Fig.  3.  Lithologies of Bulqiza ophiolite

      图  4  布尔奇泽各岩相镜下特征照片

      a.方辉橄榄岩(正交偏光);b.透镜状纯橄岩(正交偏光);c.纯橄岩壳中橄榄石的定向包裹体(单偏光);d.纯橄岩壳中橄榄石的定向包裹体(单偏光);Ol.橄榄石;Spl.铬尖晶石;Opx.斜方辉石

      Fig.  4.  Photomicrographs of different lithologies from Bulqiza ophiolite

      图  5  布尔奇泽纯橄岩壳中橄榄石的铬尖晶石(磁铁矿)成分(Cr、Fe、Mg、Si、Al)面扫描图

      铬尖晶石(磁铁矿);Olivine.橄榄石

      Fig.  5.  X-ray element (Cr、Fe、Mg、Si、Al) maps showing chemical variations in the clinopyroxene, chromian spinel (magnetite) and olivine from Bulqiza high Cr# dunite shell Spl(Mgt)

      图  6  纯橄岩壳中定向包体的激光拉曼谱图

      Fig.  6.  Laser Raman spectra of directional intergrowth inclusions from the dunite shell

      图  7  布尔奇泽纯橄岩壳中橄榄石的纳米级颗粒铬尖晶石(磁铁矿)和单斜辉石背散射照片

      Cpx.单斜辉石;Spl.铬尖晶石;Ol.橄榄石

      Fig.  7.  Back scattered (BSE) images of the clinopyroxene and spinel (magnetite) intergrowths in the olivine from Bulqiza dunite

      图  8  布尔奇泽蛇绿岩中不同岩相的橄榄石成分图解

      Fig.  8.  Compositional range of olivine in different lithologies of the Bulqiza ophiolite

      图  9  布尔奇泽地幔橄榄岩中不同岩相中铬尖晶石-橄榄石化学成分图解

      a.布尔奇泽地幔橄榄岩中铬尖晶石的Cr# vs. Mg#图解;b.地幔橄榄岩中铬尖晶石的Cr# vs. TiO2;c.地幔橄榄岩中铬尖晶石的Al2O3 vs. TiO2;d.地幔橄榄岩中铬尖晶石的Cr# vs.橄榄石的Fo值.方辉橄榄岩和铬铁矿的数据来源于Xiong et al.(2015)

      Fig.  9.  Mineral chemistry of different lithologies in spinel and olivine from Bulqiza ophiolite

      表  1  布尔奇泽橄榄岩中橄榄石的电子探针分析结果(%)

      Table  1.   Representative microprobe analyses of olivine from Bulqiza peridotite (%)

      岩性 样品号 SiO2 MgO MnO K2O Cr2O3 CaO Al2O3 FeO TiO2 Na2O NiO Total Fo
      纯橄岩壳 Al.6.4.3 41.87 52.39 0.03 0.00 0.01 0.03 0.00 4.18 0.00 0.01 0.60 99.11 95.72
      Al.6.4.3 41.57 52.53 0.05 0.01 0.03 0.02 0.00 4.17 0.00 0.00 0.63 99.00 95.74
      Al.6.4.3 41.69 51.83 0.06 0.01 0.04 0.02 0.00 5.20 0.01 0.00 0.49 99.35 94.67
      Al.6.4.3 42.04 51.74 0.11 0.03 0.00 0.00 0.00 5.33 0.02 0.00 0.59 99.86 94.54
      Al.6.4.3 41.05 54.01 0.08 0.00 0.02 0.03 0.00 4.27 0.00 0.00 0.56 100.02 95.75
      透镜状纯橄岩 12Al.3.1 41.30 50.68 0.12 0.01 0.00 0.04 0.00 8.42 0.00 0.00 0.24 100.80 91.48
      12Al.5.2 41.39 50.72 0.11 0.00 0.01 0.05 0.00 8.18 0.00 0.01 0.39 100.85 91.71
      12Al.5.5 41.93 50.16 0.10 0.00 0.02 0.03 0.02 8.04 0.00 0.01 0.35 100.65 91.75
      12Al.5.7 41.33 50.61 0.12 0.01 0.02 0.03 0.00 8.16 0.00 0.00 0.36 100.64 91.70
      12Al.5.8 40.96 50.45 0.12 0.03 0.03 0.00 0.00 7.86 0.01 0.00 0.37 99.82 91.96
      下载: 导出CSV

      表  2  布尔奇泽橄榄岩中铬尖晶石的电子探针分析结果(%)

      Table  2.   Representative microprobe analyses of chromian spinels from Bulqiza peridotite (%)

      岩性 样品 Cr2O3 Al2O3 MgO FeO MnO CaO K2O Na2O TiO2 SiO2 NiO Total Mg# Cr#
      纯橄岩壳 12Al.6.4 58.81 11.18 14.06 15.27 0.21 0.00 0.01 0.01 0.16 0.02 0.11 99.84 62.50 77.92
      12Al.6.4 58.27 11.18 14.16 15.63 0.30 0.00 0.00 0.01 0.14 0.00 0.08 99.76 62.00 77.76
      12Al.6.4 58.23 11.48 13.96 15.38 0.30 0.00 0.00 0.00 0.16 0.01 0.17 99.69 62.13 77.28
      12Al.6.2 60.77 8.69 12.62 17.35 0.33 0.00 0.00 0.00 0.10 0.03 0.03 99.93 56.78 82.43
      12Al.6.2 61.05 8.66 12.57 17.18 0.30 0.02 0.01 0.00 0.04 0.00 0.06 99.89 56.69 82.54
      透镜状纯橄岩 12Al.3.1 57.18 10.65 9.72 21.07 0.40 0.00 0.00 0.04 0.15 0.05 0.06 99.31 45.66 78.27
      12Al.3.1 56.97 10.35 9.90 21.31 0.47 0.00 0.00 0.01 0.17 0.06 0.00 99.24 45.81 78.69
      12Al.5.1 56.71 11.72 8.90 21.73 0.42 0.02 0.01 0.01 0.05 0.03 0.07 99.67 42.47 76.45
      12Al.5.3 55.61 10.97 8.26 23.57 0.44 0.00 0.01 0.00 0.07 0.09 0.02 99.03 38.98 77.28
      12Al.5.4 56.57 11.13 8.69 22.27 0.44 0.00 0.01 0.01 0.00 0.04 0.04 99.18 41.27 77.33
      下载: 导出CSV
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