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    拉萨地块措勤-隆格尔地区铁矿床成岩时代、岩石成因及构造环境指示

    于玉帅 周云 鲍波 高原 杨竹森

    于玉帅, 周云, 鲍波, 高原, 杨竹森, 2019. 拉萨地块措勤-隆格尔地区铁矿床成岩时代、岩石成因及构造环境指示. 地球科学, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037
    引用本文: 于玉帅, 周云, 鲍波, 高原, 杨竹森, 2019. 拉萨地块措勤-隆格尔地区铁矿床成岩时代、岩石成因及构造环境指示. 地球科学, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037
    Yu Yushuai, Zhou Yun, Bao Bo, Gao Yuan, Yang Zhusen, 2019. Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China. Earth Science, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037
    Citation: Yu Yushuai, Zhou Yun, Bao Bo, Gao Yuan, Yang Zhusen, 2019. Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China. Earth Science, 44(6): 1888-1904. doi: 10.3799/dqkx.2019.037

    拉萨地块措勤-隆格尔地区铁矿床成岩时代、岩石成因及构造环境指示

    doi: 10.3799/dqkx.2019.037
    基金项目: 

    国家自然科学基金项目 41503040

    国家重点研发计划 2016YFC0600306

    详细信息
      作者简介:

      于玉帅(1985-), 男, 助理研究员, 博士研究生, 从事地质找矿和矿床学研究

    • 中图分类号: P581;P597

    Geochronology, Petrogenesis and Its Tectonic Setting Significance of Intrusive Rocks from Coqen to Longgeer Iron Deposit, Lhasa Subterrane, Tibet, China

    • 摘要: 为深入了解中北部拉萨地块构造背景, 利用LA-ICP-MS技术对洛布勒铁矿床成矿花岗闪长岩锆石进行了U-Th-Pb同位素测定, 分析了隆格尔、洛布勒铁矿床侵入岩岩石地球化学和Sr-Nd-Pb同位素组成.获得洛布勒花岗闪长岩锆石U-Pb年龄为111.3±1.6 Ma(MSWD=0.61, n=9).隆格尔和洛布勒铁矿床侵入岩高硅(66.63%~69.02%和64.33%~64.82%)、富碱(全碱为5.91%~6.40%和5.81%~6.05%)、低A/CNK(0.91~0.97和0.94~0.95)、SiO2与P2O5含量负相关;稀土元素总量较低(∑ REE为123.11×10-6~148.83×10-6和96.17×10-6~101.92×10-6), 球粒陨石标准化配分模式图右倾, 弱Eu负异常(0.70~0.82和0.79~0.81), 富集大离子亲石元素Rb、Th、U、K、Pb等, 亏损Ba和高场强元素Nb、Ta、Sr、Ti等.隆格尔花岗岩全岩和斜长石(206Pb/204Pb)t为18.474和18.626, (207Pb/204Pb)t为15.657和15.722, (208Pb/204Pb)t为38.592和39.145, (87Sr/86Sr)i为0.704 757 6和0.707 047 3, (143Nd/144Nd)i为0.512 281和0.512 339, εNd(t)为-4.13和-2.99, tDM2为1.15 Ga和1.24 Ga;洛布勒花岗闪长岩(206Pb/204Pb)t比值为18.281, (207Pb/204Pb)t比值为15.616, (208Pb/204Pb)t比值为38.369, (87Sr/86Sr)i为0.706 551 4;(143Nd/144Nd)i为0.512 309, εNd(t)为-3.62, tDM2为1.20 Ga.结果表明, 措勤-隆格尔铁矿床成矿侵入岩为中钾-高钾钙碱性岩Ⅰ型花岗岩, 为早白垩世晚期岛弧岩浆活动产物, 岩浆源于地壳物质部分熔融, 岩浆演化过程经历了壳幔岩浆混合和围岩混染.结合前人研究成果, 通过对比白垩纪中北部拉萨地块和南部羌塘地块成矿事件的差异, 提出中北部拉萨地块113±3 Ma岩浆活动和Fe(-Cu)成矿事件与向南俯冲的班公湖-怒江洋壳发生断离有关.

       

    • 图  1  拉萨地块构造简图(a)和洛布勒(b)、隆格尔(c)和尼雄矿田滚纠(d)铁矿地质简图

      Fig.  1.  Tectonic subdivisions of Lhasa block (a) and geological map Luobule (b), Longgeer (c) and Gunjiu (d) iron deposits

      图  2  洛布勒(a, b)、隆格尔(c, d)、尼雄矿田滚纠(e, f)铁矿侵入岩和矿石照片

      Fig.  2.  Photos of intrusive rock and ore of Luobule (a, b), Longgeer (c, d) and Gunjiu (e, f) iron deposits

      图  3  洛布勒花岗闪长岩锆石CL图像和206Pb/238U年龄和U-Pb谐和图

      Fig.  3.  Cathodoluminescence image and 206Pb/238U concordian diagram of zircon grains of Luobule granodiorite

      图  4  洛布勒、隆格尔、尼雄铁矿侵入岩TAS(a)和K2O-SiO2(b)图解

      尼雄侵入岩据张晓倩等(2010)于玉帅等(2011)范淑芳等(2015)

      Fig.  4.  TAS (a) and K2O-SiO2 (b) diagrams of intrusive rocks of Luobule, Longgeer and Nixiong iron deposits

      图  5  洛布勒、隆格尔、尼雄铁矿侵入岩稀土元素配分曲线和微量元素蜘蛛网图

      尼雄侵入岩据张晓倩等, (2010)于玉帅等(2011)范淑芳等(2015);则弄群火山岩据刘伟等(2010a)

      Fig.  5.  Chondrite - normalized REE patterns and Pimitive mantle normalized traceel ement spectrum of intrusive rocks of Luobule, Longgeer and Nixiong iron deposits

      图  6  洛布勒、隆格尔、尼雄铁矿侵入岩P2O5-SiO2 (a)、Th-Rb (b)、Nb/La-SiO2 (c)、εNd(t)-SiO2 (d)、Rb/Yb-Nb/Y (e)和FeOT-MgO (f)图解

      尼雄侵入岩据张晓倩等(2010)于玉帅等(2011)范淑芳等(2015);图例与图 4相同

      Fig.  6.  P2O5-SiO2 (a), Th-Rb (b), Nb/La-SiO2 (c), εNd(t)-SiO2 (d), Rb/Yb-Nb/Y (e) and FeOT-MgO (f) diagrams of intru- sive rocks of Luobule, Longgeer and Nixiong iron deposits

      图  7  洛布勒、隆格尔、尼雄铁矿侵入岩Ce/Pb-Ce (a)、Nb/Th-Nb (b)、207Pb/204Pb-206Pb/204Pb(c)和(143Nd/144Nd)i-206Pb/204Pb(d)同位素图解

      尼雄侵入岩据张晓倩等(2010)于玉帅等(2011)范淑芳等(2015);图例与图 4相同

      Fig.  7.  Ce/Pb-Ce (a), Nb/Th-Nb (b), 207Pb/204Pb-206Pb/204Pb (c) and (143Nd/144 Nd)i-206Pb/204Pb (d) diagrams of intrusive rocks of Luobule, Longgeer, Nixiong iron deposits

      图  8  洛布勒、隆格尔、尼雄铁矿侵入岩Th/La-Ce/Pb(a)、Rb/Y-Nb/Ya(b)、Th/Yb-Sr/Nd(c)、Th/Ce-Th/Sm (d)、Mg#-SiO2(e)和εNd (t)(- 87Sr/86Sr)i(f)图解

      尼雄侵入岩据张晓倩等(2010)范淑芳等(2015);则弄群火山岩据刘伟等(2010a);图例与图 4相同

      Fig.  8.  Th/La-Ce/Pb (a), Rb/Y-Nb/Y (b), Th/Yb-Sr/Nd (c), Th/Ce-Th/Sm (d), Mg#-SiO2 (e) and εNd(t)- (87Sr/86Sr)i (f) diagrams of intrusive rock of Luobule, Longgeer, Nixiong iron deposits

      表  1  隆格尔和洛布勒铁矿侵入岩铅锶钕同位素组成

      Table  1.   Pb, Rb and Sr isotope compositions of intrusive rocks from Longgeer and Luobule iron deposits

      样号 LGR08-13-1(全岩) LGR004-4(斜长石) LBL08-l-3-l(全岩)
      208Pb/204Pb 38.975 39.145 38.768
      207Pb/204Pb 15.663 15.723 15.623
      206Pb/204Pb 18.597 18.626 18.425
      (208Pb/204Pb)t 38.584 38.964 38.369
      (207Pb/204Pb)t 15.657 15.718 15.616
      (206Pb/204Pb)t 18.472 18.550 18.281
      Rb(10-6) 118 15.26 112
      Sr(10-6) 221 334.5 209
      87Rb/86Sr 1.542 22 0.132 00 1.545 53
      87Sr/86Sr 0.707 243 0.707 260 0.708 996
      (87Sr/86Sr)i 0.704 758 0.707 047 0.706 551
      Sm(l0-6) 4.35 0.623 0 3.63
      Nd(l0-6) 22.1 5.059 16.8
      147Sm/144Nd 0.119 257 0.074 490 0.130 454
      143Nd/144Nd 0.512 369 0.512 394 0.512 404
      (143Nd/144Nd). 0.512 281 0.512 339 0.512 309
      εNd(t) -4.13 -2.99 -3.62
      tDM2(Ga) 1.24 1.15 1.20
      注:(87Sr/86)i=87Sr/86Sr-87Rb/86Sr× (eλt-1); εNd(t) = (143Nd/144NdSample(t)/143Nd/144NdCHUR(t) -1) ×104143Nd/144NdCHUR(t)=0.512638-0.1967×(eλt-1).
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