西藏纳如松多矿区晚白垩世石英闪长岩锆石原位Hf-O同位素特征与岩石成因

龚雪婧, 杨竹森, 庄亮亮, 马旺. 西藏纳如松多矿区晚白垩世石英闪长岩锆石原位Hf-O同位素特征与岩石成因[J]. 地质通报, 2022, 41(11): 1915-1926. doi: 10.12097/j.issn.1671-2552.2022.11.002
引用本文: 龚雪婧, 杨竹森, 庄亮亮, 马旺. 西藏纳如松多矿区晚白垩世石英闪长岩锆石原位Hf-O同位素特征与岩石成因[J]. 地质通报, 2022, 41(11): 1915-1926. doi: 10.12097/j.issn.1671-2552.2022.11.002
GONG Xuejing, YANG Zhusen, ZHUANG Liangliang, MA Wang. In situ zircon Hf-O isotopic characteristics and petrogenesis of Late Cretaceous quartz diorite in the Narusongduo Pb-Zn mining area, Tibet[J]. Geological Bulletin of China, 2022, 41(11): 1915-1926. doi: 10.12097/j.issn.1671-2552.2022.11.002
Citation: GONG Xuejing, YANG Zhusen, ZHUANG Liangliang, MA Wang. In situ zircon Hf-O isotopic characteristics and petrogenesis of Late Cretaceous quartz diorite in the Narusongduo Pb-Zn mining area, Tibet[J]. Geological Bulletin of China, 2022, 41(11): 1915-1926. doi: 10.12097/j.issn.1671-2552.2022.11.002

西藏纳如松多矿区晚白垩世石英闪长岩锆石原位Hf-O同位素特征与岩石成因

  • 基金项目:
    第二次青藏高原综合科学考察研究专题《冈底斯西段与班怒带铜铅锌矿科考与资源潜力》(编号: 2021QZKK0302)、国家自然科学基金重大研究计划《战略性关键金属超常富集成矿动力学》培育项目《念青唐古拉关键金属铍钨超常富集机制与成矿潜力研究》(批准号: 92062105)和国家自然科学基金重大研究计划《特提斯地球动力系统》重点支持项目《陆-陆碰撞褶皱逆冲带内MVT铅锌成矿作用: 青藏高原与扎格罗斯造山带对比研究》(批准号: 91855214)
详细信息
    作者简介: 龚雪婧(1988-), 女, 博士, 副研究员, 从事矿床学、岩石地球化学研究。E-mail: xuejinggong@cags.ac.cn
  • 中图分类号: P534.53;P588.12+2

In situ zircon Hf-O isotopic characteristics and petrogenesis of Late Cretaceous quartz diorite in the Narusongduo Pb-Zn mining area, Tibet

  • 拉萨地体的增生演化受到新特提斯洋俯冲的制约, 新特提斯洋于中生代启动北向俯冲, 在拉萨地体南部形成晚白垩世"岩浆大爆发"。纳如松多铅锌矿床位于中拉萨地体南缘, 矿区内晚白垩世石英闪长岩的岩浆源区特征及成因机制目前尚未得到很好的解释。通过矿区内该石英闪长岩的SHRIMP锆石U-Pb年龄与Hf-O同位素组成研究, 结果表明, 纳如松多石英闪长岩结晶年龄为83.0±1.0 Ma, 锆石εHf(t)和二阶段模式年龄TDM2分别为-2.6~1.0(平均值为-0.8)和1139~1363 Ma(平均值为1253 Ma); δ18O值介于6.5‰~7.9‰之间(平均值为7.2‰)。锆石原位Hf-O同位素组成指示, 石英闪长岩源区具有壳幔二端元混合的特征, 二端元混合模式计算显示幔源岩浆贡献较大, 且存在成熟地壳物质加入。纳如松多石英闪长岩与南拉萨地体晚白垩世岩浆的活动时间和动力学背景一致, 是拉萨地体南部晚白垩世岩浆大爆发事件的一部分, 指示由新特提斯洋北向俯冲引起的晚白垩世强烈岩浆活动的范围不局限于南拉萨地体, 还延伸到中拉萨地体。

  • 加载中
  • 图 1  拉萨地体地质简图

    Figure 1. 

    图 2  纳如松多矿区东段地质图(据参考文献[18]修改)

    Figure 2. 

    图 3  纳如松多矿区石英闪长岩手标本(a)及显微镜下正交偏光矿物组合特征(b、c)

    Figure 3. 

    图 4  纳如松多矿区石英闪长岩部分锆石阴极发光图像、测试位置、年龄和εHf(t)/δ18O值(a)及SHRIMP锆石U-Pb谐和图(b)

    Figure 4. 

    图 5  纳如松多矿区石英闪长岩锆石εHf(a)和δ18O值(b) 组成频数统计图

    Figure 5. 

    图 6  纳如松多矿区石英闪长岩锆石原位εHf(t)-δ18O关系图解

    Figure 6. 

    图 7  纳如松多矿区石英闪长岩锆石εHf(t)与U-Pb年龄图解

    Figure 7. 

    表 1  纳如松多铅锌矿床石英闪长岩锆石SHRIMP U-Pb年龄分析结果

    Table 1.  Zircon SHRIMP U-Pb ages of quartz diorite in the Narusongduo Pb-Zn deposit

    测点号 含量/10-6 Th/U 同位素比值 年龄/Ma
    Th U 207Pb/206Pb 1σ(%) 207Pb/235U 1σ(%) 206Pb/238U 1σ(%) 206Pb/238U
    ZK-2-1-1 414 242 1.77 0.0484 11.5 0.09 11.7 0.0131 2.0 83.8 1.7
    ZK-2-1-2 317 199 1.65 0.0525 6.2 0.10 6.5 0.0132 2.0 84.3 1.7
    ZK-2-1-3 589 364 1.67 0.0429 10.0 0.08 10.3 0.0134 2.4 86.1 2.1
    ZK-2-1-4 261 351 0.77 0.0460 5.9 0.08 6.2 0.0128 1.9 81.7 1.5
    ZK-2-1-5 436 264 1.70 0.0480 5.5 0.09 5.9 0.0132 2.0 84.6 1.6
    ZK-2-1-6 359 214 1.73 0.0249 45.0 0.04 45.2 0.0121 4.0 77.8 3.1
    ZK-2-1-7 385 222 1.79 0.0280 30.3 0.05 30.4 0.0124 2.4 79.1 1.9
    ZK-2-1-8 401 343 1.21 0.0370 14.7 0.06 14.8 0.0126 2.1 80.5 1.7
    ZK-2-1-9 235 180 1.35 0.0477 7.0 0.09 7.3 0.0139 2.3 88.9 2.0
    ZK-2-1-10 453 265 1.76 0.0504 5.4 0.09 5.8 0.0135 2.1 86.5 1.8
    ZK-2-1-11 815 665 1.27 0.0372 15.2 0.07 15.3 0.0127 1.9 81.3 1.5
    ZK-2-1-12 351 220 1.65 0.0280 38.3 0.05 38.4 0.0130 2.4 83.2 2.0
    ZK-2-1-13 167 730 0.24 0.0622 1.1 0.86 2.0 0.1005 1.6 617.2 9.5
    ZK-2-1-14 505 358 1.46 0.0400 8.9 0.07 9.1 0.0126 1.9 80.5 1.5
    ZK-2-1-15 277 836 0.34 0.1611 0.4 9.83 1.7 0.4426 1.6 2362 32
    ZK-2-1-16 483 288 1.73 0.0407 11.4 0.07 11.5 0.0128 2.0 82.1 1.7
    ZK-2-1-17 286 187 1.58 0.0770 18.8 0.14 19.0 0.0133 2.9 85.0 2.4
    ZK-2-1-18 192 150 1.33 0.0403 14.5 0.07 14.7 0.0135 2.3 86.1 2.0
    ZK-2-1-19 467 279 1.73 0.0632 12.6 0.12 12.8 0.0134 2.2 85.7 1.9
    ZK-2-1-20 437 253 1.78 0.0470 8.5 0.08 8.8 0.0130 2.0 83.0 1.6
    ZK-2-1-21 164 158 1.07 0.2026 0.6 15.3 1.8 0.5476 1.7 2815 39
    下载: 导出CSV

    表 2  纳如松多铅锌矿床石英闪长岩锆石原位Hf-O同位素组成

    Table 2.  Zircon Hf-O isotopic compositions of quartz diorites in the Narusongduo Pb-Zn deposit

    测点号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf εHf(t) tDM/Ma tDM2/Ma δ18O/‰ T/Ma
    ZK-2-8-1 0.0234 0.00069 0.282710 0.000019 -0.4 761 1227 7.4 0.2 83.7
    ZK-2-8-2 0.0233 0.00068 0.282749 0.000020 1.0 707 1139 7.2 0.3 84.3
    ZK-2-8-3 0.0225 0.00066 0.282723 0.000016 0.1 743 1198 7.1 0.3 86.1
    ZK-2-8-4 0.0195 0.00060 0.282676 0.000021 -1.6 807 1304 6.9 0.2 81.7
    ZK-2-8-5 0.0169 0.00050 0.282688 0.000020 -1.2 788 1277 7.0 0.3 84.6
    ZK-2-8-6 0.0187 0.00056 0.282703 0.000025 -0.8 769 1243 7.2 0.1 77.7
    ZK-2-8-7 0.0263 0.00076 0.282667 0.000021 -2.0 823 1324 7.8 0.3 79.1
    ZK-2-8-8 0.0105 0.00033 0.282685 0.000019 -1.3 789 1284 7.1 0.2 80.5
    ZK-2-8-9 0.0141 0.00043 0.282717 0.000017 0.0 747 1211 7.3 0.2 88.9
    ZK-2-8-10 0.0221 0.00066 0.282697 0.000019 -0.8 779 1257 7.1 0.3 86.5
    ZK-2-8-11 0.0172 0.00052 0.282675 0.000015 -1.7 807 1306 6.7 0.2 81.3
    ZK-2-8-12 0.0118 0.00036 0.282705 0.000016 -0.6 762 1239 7.2 0.2 83.1
    ZK-2-8-13 0.0263 0.00080 0.282465 0.000016 2.4 1107 1778 7.5 0.2 617.2
    ZK-2-8-14 0.0145 0.00044 0.282688 0.000020 -1.2 787 1277 6.5 0.2 80.5
    ZK-2-8-15 0.0209 0.00071 0.281216 0.000021 -3.2 2815 4533 2362
    ZK-2-8-16 0.0221 0.00065 0.282650 0.000019 -2.6 845 1363 7.1 0.2 82.1
    ZK-2-8-17 0.0165 0.00049 0.282710 0.000017 -0.4 758 1227 7.9 0.2 85.1
    ZK-2-8-18 0.0136 0.00041 0.282704 0.000019 -0.5 764 1241 6.8 0.2 86.1
    ZK-2-8-19 0.0185 0.00054 0.282735 0.000019 0.5 724 1171 7.4 0.2 85.7
    ZK-2-8-20 0.0197 0.00057 0.282689 0.000019 -1.1 789 1275 7.2 0.4 83.0
    ZK-2-8-21 0.0400 0.00120 0.280953 0.000019 -3.3 3209 5100 7.6 0.3 2815
    下载: 导出CSV
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收稿日期:  2022-07-28
修回日期:  2022-09-13
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