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    滇西北中甸弧成矿岩体中榍石化学成分特征及其成岩成矿标识

    李华伟 董国臣 董朋生 汤家辉 王树树

    李华伟, 董国臣, 董朋生, 汤家辉, 王树树, 2020. 滇西北中甸弧成矿岩体中榍石化学成分特征及其成岩成矿标识. 地球科学, 45(6): 1999-2010. doi: 10.3799/dqkx.2019.193
    引用本文: 李华伟, 董国臣, 董朋生, 汤家辉, 王树树, 2020. 滇西北中甸弧成矿岩体中榍石化学成分特征及其成岩成矿标识. 地球科学, 45(6): 1999-2010. doi: 10.3799/dqkx.2019.193
    Li Huawei, Dong Guochen, Dong Pengsheng, Tang Jiahui, Wang Shushu, 2020. Titanite Chemical Compositions and Their Implications for Petrogenesis and Mineralization in Zhongdian Arc, NW Yunnan, China. Earth Science, 45(6): 1999-2010. doi: 10.3799/dqkx.2019.193
    Citation: Li Huawei, Dong Guochen, Dong Pengsheng, Tang Jiahui, Wang Shushu, 2020. Titanite Chemical Compositions and Their Implications for Petrogenesis and Mineralization in Zhongdian Arc, NW Yunnan, China. Earth Science, 45(6): 1999-2010. doi: 10.3799/dqkx.2019.193

    滇西北中甸弧成矿岩体中榍石化学成分特征及其成岩成矿标识

    doi: 10.3799/dqkx.2019.193
    基金项目: 

    国家“973”项目 2015CB452604

    国家重点研发项目 2016YFC0600502

    111引智计划 B18048

    详细信息
      作者简介:

      李华伟(1993-), 男, 硕士研究生, 矿产普查与勘探专业

      通讯作者:

      董国臣

    • 中图分类号: P574;P611

    Titanite Chemical Compositions and Their Implications for Petrogenesis and Mineralization in Zhongdian Arc, NW Yunnan, China

    • 摘要: 位于西南三江构造火成岩带义敦弧南段的中甸弧,以发育印支期斑岩型铜矿床和燕山期矽卡岩-热液石英脉型钼-钨-铜矿而著称.针对普朗、地苏嘎和休瓦促成矿岩体中的榍石单矿物,利用EMPA和LA-ICP-MS测定化学成分,探讨化学成分对成岩成矿的指示意义.普朗、地苏嘎和休瓦促岩体榍石均为岩浆来源.普朗岩体榍石形成温度为743~754℃,休瓦促岩体榍石形成温度为702~753℃.根据榍石的δCe、δEu推断三个岩体氧逸度高低顺序为:普朗>地苏嘎>休瓦促,榍石中的Cu含量对母岩浆中的Cu金属量变化不敏感,不能单独作为母岩浆Cu金属量的判别标志;钼成矿对岩体的氧逸度要求不高,在利用榍石中的Mo含量判断母岩浆中的Mo金属量时要综合考虑氧逸度和辉钼矿结晶的影响;岩体中的F含量能降低岩浆粘度,对钼成矿有促进作用,可以作为Mo成矿的指标;榍石中的W、Sn含量对Mo-W矿床具有指示作用,休瓦促Mo-W矿岩体中榍石的W、Sn含量要高于普朗和地苏嘎不成Mo-W矿的岩体.

       

    • 图  1  东南亚构造单元划分简图(a)、义敦弧地质简图(b)和中甸弧地质简图(c)

      图a中, YD.义敦弧;WB.西缅甸地块; SG.松潘-甘孜褶皱带; NLA.北拉萨弧; SQA:南羌塘弧; a.据Wang et al.(2014)修改; b.据Cao et al.(2019)修改; c.据Cao et al.(2019)修改

      Fig.  1.  The simplified diagram of structural units in Southeast Asia (a), the simplified geological maps of the Yindun arc (b) and the Zhongdian arc (c)

      图  2  普朗、地苏嘎和休瓦促矿区地质简图

      a.普朗矿区(据Cao et al., 2019修改); b.地苏嘎矿区(据刘学龙等, 2013修改); c.休瓦促矿区(据Yang et al., 2017修改)

      Fig.  2.  Geological map of Pulang, Disuga and Xiuwacu deposits

      图  3  普朗、地苏嘎和休瓦促榍石镜下特征

      Ttn.榍石;Ap.磷灰石;Zr.锆石;Q.石英;Pl.斜长石;Bt.黑云母;Hbl.角闪石

      Fig.  3.  Photomicrographs and BSE images of the titanites in Pulang, Disuga and Xiuwacu

      图  4  普朗、地苏嘎和休瓦促榍石δCe-δEu图解

      Fig.  4.  Plot of δCe vs. δEu for titanites from Pulang, Disuga and Xiuwacu

      图  5  普朗、地苏嘎和休瓦促全岩和榍石样品稀土元素球粒陨石标准化配分曲线

      Fig.  5.  Chondrite-normalized REE pattern of titanites and whole rocks from Pulang, Disuga and Xiuwacu

      图  6  普朗、地苏嘎和休瓦促榍石δCe-F图解

      Fig.  6.  Plot of δCe vs. F for titanites from Pulang, Disuga and Xiuwacu

      图  7  普朗、地苏嘎和休瓦促榍石W-Sn图解

      Fig.  7.  Plot of W vs. Sn for titanites from Pulang, Disuga and Xiuwacu

      表  1  普朗、地苏嘎和休瓦促榍石EMPA测试结果

      Table  1.   The EMPA results of titanites from Pulang, Disuga and Xiuwacu

      样号 F Al2O3 Na2O MgO SiO2 FeO MnO TiO2 CaO K2O P2O5 Total
      DSG⁃1 0.228 1.140 0.023 0.028 30.836 1.361 0.089 37.752 27.366 0.016 0.097 98.840
      DSG⁃2 0.061 0.833 - 0.008 30.166 1.053 0.095 37.341 26.897 0.007 0.063 96.498
      DSG⁃3 0.205 1.229 0.038 - 30.576 1.527 0.121 35.800 27.299 0.006 0.084 96.799
      DSG⁃4 0.261 1.122 0.017 - 30.742 1.349 0.089 36.726 27.284 0.009 0.088 97.577
      DSG⁃5 0.273 1.009 - 0.009 30.602 1.389 0.057 37.210 27.431 - 0.111 97.976
      PL⁃1 0.086 1.149 - - 30.572 1.316 0.121 35.704 27.220 - 0.091 96.223
      PL⁃2 0.240 1.045 - 0.003 30.501 1.335 0.013 36.704 27.440 - 0.104 97.284
      PL⁃3 0.183 1.058 0.009 0.028 30.359 1.630 0.083 37.127 27.155 - 0.014 97.569
      PL-4 0.294 1.125 - 0.002 30.521 1.362 0.089 38.176 27.398 - 0.120 98.963
      PL⁃5 0.279 1.196 0.006 0.009 30.663 1.642 0.006 37.414 27.457 0.003 0.104 98.662
      XWC⁃1 1.432 3.213 - 0.154 30.544 2.669 0.248 28.937 26.308 - - 92.902
      XWC⁃2 1.391 3.880 0.029 0.175 30.249 3.476 0.457 26.999 25.507 0.002 0.018 91.597
      XWC⁃3 1.285 3.315 0.053 0.177 29.643 3.252 0.344 29.010 25.723 0.009 0.009 92.279
      XWC⁃4 1.229 3.221 - 0.134 30.371 3.041 0.218 30.795 26.091 - 0.072 94.655
      XWC⁃5 1.575 3.332 - 0.160 30.185 2.921 0.513 30.521 26.107 - 0.037 94.688
      注:“-”代表低于检测限,FeO为全铁含量;单位为%.
      下载: 导出CSV

      表  2  榍石Zr温度计计算结果

      Table  2.   Calculation results of Zr⁃in⁃titanite geothermometer

      普朗石英二长斑岩榍石,
      P=0.172 GPa
      休瓦促二长花岗岩榍石,
      P=0.264 GPa
      样品号 Zr(10-6) T(℃) 样品号 Zr(10-6) T(℃)
      PL⁃01 598.1 744 XWC⁃01 512.6 746
      PL⁃02 661.8 750 XWC⁃02 500.5 745
      PL⁃03 703.4 753 XWC⁃03 225.8 702
      PL⁃04 655.6 749 XWC⁃04 370.1 728
      PL⁃05 590.2 743 XWC⁃05 466.7 741
      PL⁃06 617.2 746 XWC⁃06 490.9 744
      PL⁃07 624.4 746 XWC⁃07 455.6 740
      PL⁃08 641.8 748 XWC⁃08 242.5 706
      PL⁃09 669.5 750 XWC⁃09 578.6 753
      PL⁃10 628.8 747 XWC⁃10 254.9 708
      PL⁃11 659.4 749 XWC⁃11 501.3 745
      PL⁃12 718.7 754 XWC⁃12 444.6 738
      PL⁃13 607.0 745 XWC⁃13 293.0 716
      平均值 748 平均值 732
      下载: 导出CSV
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