Material composition, age and significance of the Dong Co Melange in the Bangong Co-Nujiang suture zone
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摘要:
班公湖-怒江缝合带中段洞错混杂岩保存了完整的与大洋演化相关的混杂岩系，包括蛇绿岩岩块、洋岛残片，以及复理石岩片、大陆边缘沉积等沉积岩块体，是恢复和反演班公湖-怒江洋演化的理想地区。在综述前人研究的基础上，结合近年来的研究成果，归纳和总结洞错混杂岩的物质组成和时代，初步阐述洞错混杂岩对班公湖-怒江洋演化的指示意义。结果表明，洞错混杂岩中无论是蛇绿岩残块、洋岛残片还是次深海-深海复理石岩片等，均是不同时代多期次构造混杂的混杂体。最早的年龄记录可追溯至晚二叠世末期，最晚可延至早白垩世中晚期，是班公湖-怒江洋晚二叠世末期-早白垩世中晚期连续演化的记录。洞错混杂岩早白垩世中晚期大陆边缘沉积与蛇绿岩等的不整合仅是弧前楔顶盆地沉积的产物，不能约束班公湖-怒江洋的最终消亡。
Abstract:The Dong Co Melange, which contains various Ophiolitic blocks, ocean island fragments, flysch deposits, and continental marginal sediments, is an ideal object for restoring the evolution of the Bangong Co-Nujiang Ocean. In this paper, the authors present a detailed review and in-depth analysis of previous studies about the Dong Co Melange with the purpose of clarifying the material composition and age of the Dong Co Melange and discussing the significance of the Dong Co Melange. The authors hold that the ophiolitic blocks, ocean island fragments and flysch deposits in the Dong Co Melange are all multi-stage tectonic mélange, with their earliest age probably being the latest Late Permian and the latest age being the Early Cretaceous, indicating that the Bangong Co-Nujiang Ocean was continuous from the latest Late Permian to Early Cretaceous. The unconformity between the Early Cretaceous continental marginal sediments and the flysch deposits in the Dong Co Melange is only a record of fore-arc basin located on the accretion wedge.
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Key words:
- Tibetan Plateau /
- Bangong Co-Nujiang suture zone /
- Dong Co Melange
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