| 班公湖-怒江缝合带洞错混杂岩物质组成、时代及其意义 |
| |
| 引用本文： | 范建军,李才,王明,解超明,彭头平,刘海永.班公湖-怒江缝合带洞错混杂岩物质组成、时代及其意义[J].地质通报,2018,37(8):1417-1427. |
| |
| 作者姓名： | 范建军 李才 王明 解超明 彭头平 刘海永 |
| |
| 作者单位： | 吉林大学地球科学学院;福建省地质调查研究院;西藏自治区地质调查院 |
| |
| 基金项目： | 国家自然科学基金项目《班公湖-怒江洋早白垩世演化：来自复理石沉积的制约》（批准号：41702227）、《青藏高原羌塘南部埃迪卡拉纪地层研究》（批准号：41602230）、博士后创新人才支持计划项目《班公湖-怒江缝合带洞错混杂岩的时代及成因机制探讨》（编号：BX201600061）和中国地质调查局项目《班公湖-怒江成矿带铜多金属矿资源基地调查》（编号：DD20160026）、《冈底斯-喜马拉雅铜矿资源基地调查》（编号：DD20160015） |
| |
| 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。
|
| 关 键 词： | 青藏高原 班公湖-怒江缝合带 洞错混杂岩 |
| 收稿时间： | 2018/3/14 0:00:00 |
| 修稿时间： | 2018/6/29 0:00:00 |
Material composition, age and significance of the Dong Co Melange in the Bangong Co-Nujiang suture zone |
| |
| FAN Jianjun,LI Cai,WANG Ming,XIE Chaoming,PENG Touping and LIU Haiyong.Material composition, age and significance of the Dong Co Melange in the Bangong Co-Nujiang suture zone[J].Geologcal Bulletin OF China,2018,37(8):1417-1427. |
| |
| Authors: | FAN Jianjun LI Cai WANG Ming XIE Chaoming PENG Touping and LIU Haiyong |
| |
| Institution: | College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China,Fujian Institute of Geological Survey, Fuzhou 350011, Fujian, China and Tibet Institute of Geological Survey, Lhasa 850000, Tibet, China |
| |
| 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. |
| |
| Keywords: | Tibetan Plateau Bangong Co-Nujiang suture zone Dong Co Melange |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
