Material composition and oceanic basin evolution process of the Litang mélange in the middle part of the Ganzi-Litang ophiolite mélange belt
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摘要:
理塘混杂岩位于甘孜-理塘蛇绿混杂岩带中段新龙县-理塘县一带，其内部保存有完整的混杂岩系，包括蛇绿岩残片、洋岛残块、洋内弧残块、复理石建造、裂谷残片、高压变质岩等，是恢复和反演甘孜-理塘洋盆演化的理想地区。在总结前人研究的基础上，结合笔者近年来的研究成果，详细阐述了理塘混杂岩的物质组成、构造环境及形成时代，进一步约束了甘孜-理塘洋盆的时空、性质以及演化历程。LA-ICP-MS锆石U-Pb测年结果表明，甘孜-理塘混杂岩带内蛇绿岩年龄为（346±17）Ma、（286.2±5.1）Ma、（219.5±2.2）Ma、（216.1±2.3）Ma，洋岛年龄为（271±10）Ma、（245.1±1.5）Ma、（211.8±1.8）Ma，在侏罗纪瑞环山组粉砂岩夹层中测得碎屑锆石最新年龄为（196±3）Ma，结合大量的古生物化石鉴定结果，分析认为理塘混杂岩最早的年龄记录可追溯至中泥盆世，最晚可延至早白垩世，是甘孜-理塘洋盆中泥盆世-早白垩世连续演化的记录。综合以上研究成果，笔者还大致建立了甘孜-理塘洋盆晚古生代-中生代的演化过程模式。
Abstract:The Litang mélange, in which conserves complete mélange system is developed, including remnant of ophiolite, oceanic island blocks, intra-oceanic arc blocks, flysch formation, remnant of rift, high-ultrahigh pressure belt, is located in the middle part of the Ganzi-Litang ophiolite mélange belt around Xinlong-Litang county town, and is an ideal object for the restoring and inversing of the evolution of the Ganzi-Litang ocean basin. On the basis of previous studies and combined with recent research results, the mineral composition, tectonic environment and formation age of Litang melange are described in detail, which further constrain the space-time, nature and evolution of Ganzi-Litang ocean basin. The results of LA-ICP-MS zircon U-Pb dating show that the age of ophiolite is (346±17)Ma, (286.2±5.1)Ma, (219.5±2.2)Ma, (216.1±2.3)Ma, the age of oceanic island is (271±10)Ma, (245.1±1.5)Ma, (211.8±1.8)Ma, and the latest age of detrital zircon is (196±3)Ma in the siltstone interlayer of Ruihuanshan Formation in Jurassic. Combined with a large number of fossil identification results, the analysis shows that the age of the Litang mélange probably ranges from the Middle Devonian to the Early Cretaceous, indicating that it records the continuous evolution of Ganzi-Litang ocean basin from the Middle Devonian to early Cretaceous. With all the achievement mentioned above, the formation and evolution mode of the Ganzi-Litang ocean basin from the Late Paleozoic to the Mesozoic is approximately established.
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表 1 略西沟蛇绿岩玄武岩LA-ICP-MS锆石U-Pb测试结果
Table 1. LA-ICP-MS zircon U-Pb analysis data of the Luexigou ophiolite basalt
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表 2 洋岛型基性火山岩主量元素（10-2）、稀土和微量元素（10-6）分析数据
Table 2. Major (10-2), rare earth and trace (10-6) element analysis data of the oceanic island basic volcanic rocks
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表 3 理塘地区觉吾乡变质基性火山岩主量元素（10-2）、稀土和微量元素（10-6）分析数据
Table 3. Major (10-2), rare earth and trace (10-6) elements analysis data of the metamorphic basic volcanic rocks in Juewu Country, Litang
下载: 导出CSV
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