西藏多龙矿集区早白垩世美日切错组火山岩成因
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摘要
探讨西藏多龙矿集区美日切错组火山岩的形成时代与形成环境。在前人研究基础上,对美日切错组火山岩进行了锆石SHRIMP U-Pb年龄测定和岩石地球化学研究。结果显示,美日切错组的玄武岩和安山岩具有较高的Zr、MgO含量,属于钙碱性系列,相对富集大离子亲石元素和轻稀土元素,亏损高场强元素,与岛弧火山岩地球化学特征相似;流纹岩富集大离子亲石元素和轻稀土元素,具有较高的K_2O/Na_2O、Rb/Sr和Ti/Zr值以及较低的Mg~#值(18.23～37.82)。美日切错组玄武岩和安山岩属于有消减沉积物参与的地幔楔部分熔融产物;流纹岩则可能为新生下地壳镁铁质岩石部分熔融形成的产物。安山岩锆石SHRIMP U-Pb年龄为111±1.4 Ma,指示其形成于早白垩世中期。美日切错组火山岩具有大陆弧环境火山岩特征,结合区域构造演化,认为其形成于班公湖-怒江特提斯洋北向俯冲过程中。
The Meiriqiecuo Formation volcanic rocks of basalt, basaltic andesite, andesite and rhyolite in the Duolong ore-concentration area overlay unconformably on the Jurassic complex or on the early Cretaceous medium-acid intrusive rocks. On the basis of previous research, study of zircon SHRIMP U-Pb dating and geochemistry are carried out in order to unravel the petrogenesis of these Meiriqiecuo volcanic rocks. It shows that the basalt and andesite have high Zr and MgO content, belong to calc-alkaline series, and relatively enrich in LILE and LREE, and deplete in HFSE, similar to the geochemical characteristics of island arc volcanic rocks. While rhyolite is enriched in LILE and LREE, with higher K_2O/Na_2O, Rb/Sr and Ti/Zr values and lower Mg~# values(18.23 to 37.82). It is considered that the basalt and andesite were originated from partial melting of the mantle wedge with the participation of sediments,and the rhyolite was originated from partial melting of the juvenile lower crust. The zircon SHRIMP U-Pb dating of the andesite yields an age of 111±1.4 Ma, indicating that this volcanic rock assemblages were formed in the middle epoch of early Cretaceous. In consideration of regional tectonic evolution and the continent arc environment characteristics of the Meiriqiecuo Formation volcanic rocks, these volcanic rocks were likely to be related to the northward subduction of the Bangonghu-Nujiang Tethys ocean.
The Meiriqiecuo Formation volcanic rocks of basalt, basaltic andesite, andesite and rhyolite in the Duolong ore-concentration area overlay unconformably on the Jurassic complex or on the early Cretaceous medium-acid intrusive rocks. On the basis of previous research, study of zircon SHRIMP U-Pb dating and geochemistry are carried out in order to unravel the petrogenesis of these Meiriqiecuo volcanic rocks. It shows that the basalt and andesite have high Zr and MgO content, belong to calc-alkaline series, and relatively enrich in LILE and LREE, and deplete in HFSE, similar to the geochemical characteristics of island arc volcanic rocks. While rhyolite is enriched in LILE and LREE, with higher K_2O/Na_2O, Rb/Sr and Ti/Zr values and lower Mg~# values(18.23 to 37.82). It is considered that the basalt and andesite were originated from partial melting of the mantle wedge with the participation of sediments,and the rhyolite was originated from partial melting of the juvenile lower crust. The zircon SHRIMP U-Pb dating of the andesite yields an age of 111±1.4 Ma, indicating that this volcanic rock assemblages were formed in the middle epoch of early Cretaceous. In consideration of regional tectonic evolution and the continent arc environment characteristics of the Meiriqiecuo Formation volcanic rocks, these volcanic rocks were likely to be related to the northward subduction of the Bangonghu-Nujiang Tethys ocean.
引文
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