| 班公湖-怒江结合带西段多岛弧盆系时空结构初步分析 |
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| 引用本文： | 刘庆宏,肖志坚,曹圣华,廖六根,肖业斌.班公湖-怒江结合带西段多岛弧盆系时空结构初步分析[J].沉积与特提斯地质,2004,24(3):15-21. |
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| 作者姓名： | 刘庆宏 肖志坚 曹圣华 廖六根 肖业斌 |
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| 作者单位： | 江西省地质调查研究院,江西,南昌,330201 |
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| 基金项目： | 中国地质调查局"1∶25万《喀纳幅》、《日土县幅》、《羌多幅》地质填图"。 |
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| 摘 要： | 笔者依据班公湖地区1：25万喀纳幅、日土县幅、羌多幅地质填图和专题研究工作取得的阶段性成果,将班公湖带的多岛弧盆系时空结构厘定为3条蛇绿混杂岩亚带。该3条亚带为盆地所隔,从北而南依次为班公湖带北亚带、班摩掌侏罗纪弧间盆地、班公湖带中亚带、日土-巴尔穷侏罗纪—早白垩世复合弧后盆地和班公湖带南亚带等。初步认为班公湖-怒江特提斯洋经历了晚三叠—早侏罗世往北俯冲、中晚侏罗世早期向北、往南双向俯冲、早白垩世往南俯冲等3次俯冲消亡阶段;同时,讨论了在班公湖带研究中存在的问题及其在反演班公湖-怒江结合带西段构造演化和在找矿方面的意义,以及进一步研究方向。
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| 关 键 词： | 蛇绿混杂岩带 多岛弧盆系 特提斯洋 班公湖 西藏 |
| 文章编号： | 1009-3850(2004)03-0015-07 |
| 收稿时间： | 2002/4/15 0:00:00 |
A preliminary study of the spatio-temporal framework of the archipelagic arc-basin systems in the western part of the Bangong-(Nujiang) suture zone, Xizang |
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| LIU Qing-hong,XIAO Zhi-jian,CAO Sheng-hu,LIAO Liu-gen,XIAO Ye-bin.A preliminary study of the spatio-temporal framework of the archipelagic arc-basin systems in the western part of the Bangong-(Nujiang) suture zone, Xizang[J].Sedimentary Geology and Tethyan Geology,2004,24(3):15-21. |
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| Authors: | LIU Qing-hong XIAO Zhi-jian CAO Sheng-hu LIAO Liu-gen XIAO Ye-bin |
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| Institution: | Jiangxi Institute of Geological Survey, Nanchang 330201, Jiangxi, China |
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| Abstract: | The archipelagic arc-basin systems in the western part of the Bangong-(Nujiang) suture zone may be discriminated into three ophiolitic mélange subzones that are separated by the local basins, including, from north to south, the northern Bangong subzone, Banmozhang Jurassic inter-arc bain, middle Bangong subzone, (Rutog)-(Barqiong) (Jurassic)-(Early) Cretaceous composite back-arc basin and southern Bangong subzone. The (Bangong)-(Nujiang) Tethys Sea once underwent three phases of subduction and consumption:northward subduction during the Late (Triassic) and (Early) Jurassic, northward and southward subduction during the early (Middle)-(Late) (Jurassic), and southward subduction during the Early Cretaceous. The collapse of the Yarlung Zangbo back-arc basin is interpreted to be synchronous with the (arc)-(continent) collision and collage in the Bangong Lake area, and thus the (Bangong)-(Nujiang) suture zone may be considered as the main suture zone after the subduction and (consumption) (of) (the) Tethys Sea. |
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| Keywords: | ophiolitic mélange zone archipelagic (arc)-(basin) systems Tethys Sea Bangong Lake Xizang |
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