Early Cretaceous volcanic rocks in northern Baingoin, Tibet: Magmatic record of the closure of the Bangong-Nujiang Ocean
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摘要:
对班戈县北部马前乡地区的早白垩世安山岩和英安岩进行了详细的地质填图及岩石学、年代学、地球化学和Hf同位素研究。锆石U-Pb定年获得安山岩年龄分别为（108.0±1.5）Ma和（113.6±0.9）Ma；英安岩年龄为（106.7±1.9）Ma和（113.6±0.8）Ma。安山岩富集Th和U，亏损Nb、Ta和Ti，具有变化范围较大的Mg#值（25~63），锆石εHf（t）值（-8.6~+1.5）以负值为主，应当为幔源镁铁质熔体与壳源熔体的混合产物。英安岩具有与安山岩类似的微量元素成分特征及负的锆石εHf（t）值（-12.3~-8.1），应当是地壳部分熔融的产物。结合前人研究成果认为，这些早白垩世岩浆岩是约110 Ma沿班公湖-怒江缝合带岩浆大爆发的产物，可能与班公湖-怒江洋闭合之后的拉萨与羌塘地块陆-陆碰撞有关。
Abstract:The petrological, zircon U-Pb dating, whole-rock geochemical, and zircon Hf isotopic data of the Early Cretaceous andesites and dacites in the Maqianxiang area of Baingoin County, Tibet, are reported. The zircon U-Pb ages of andesite are (108.0±1.5)Ma and (113.6±0.9) Ma, and those of dacite are (106.7±1.9) Ma and (113.6±0.8) Ma. The andesites are enriched in Th and U and depleted in Nb, Ta, and Ti, have variable Mg# values (25-63), and show mainly negative zircon εHf(t) values (-8.6 to +1.5). They are probably generated by mixing of mantle- and crust-derived melts. Dacite shares similar trace element features with the coeval andesite, and has negative zircon εHf(t) values (-12.3 to -8.1). It is interpreted as a product of partially melting crust. The andesite and dacite are interpreted as a product of the ca.110 Ma magmatism along the Bangong-Nujiang suture zone, and may be related to the continent-continent collision process after the closure of the Bangong-Nujiang Ocean.
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图 1 青藏高原构造划分简图（a, 据Hu et al., 2017）和西藏班戈县马前乡地区地质简图（b）
Figure 1.
图 5 西藏班戈县马前乡安山岩（a，b）和英安岩（c，d）的微量元素原始地幔标准化蛛网图和稀土元素球粒陨石标准化配分曲线标准化数据和上地壳数据引自参考文献（据Sun and McDonough, 1989）
Figure 5.
图 7 西藏班戈县马前乡火山岩的MgO-TFeO图解（据Zorpi et al., 1989）（a）和La-La/Sm图解（据Schiano et al., 2010）（b）
Figure 7.
表 1 西藏班戈县马前乡火山岩锆石U-Th-Pb同位素数据
Table 1. LA-ICP-MS zircon U-Th-Pb data of the volcanic rocks in Maqian Town of Baingoin County, Tibet
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表 2 西藏班戈县马前乡火山岩主量（%）和微量元素（10-6）成分分析结果
Table 2. Major (%) and trace (10-6) elements data of the volcanic rocks in the Maqianxiang area, Baingoin County, Tibet
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表 3 西藏班戈县马前火山岩的锆石Hf同位素分析结果
Table 3. Zircon Hf isotopic data of the volcanic rocks in the Maqianxiang area, Baingoin County, Tibet
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