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| 西藏南部硅质岩的特征及相关问题探讨 | |
| 引用本文： | 付伟,周永章,杨志军,聂凤军,何俊国,李文.西藏南部硅质岩的特征及相关问题探讨[J].地质通报,2007,26(4):492-501. |
| 作者姓名： | 付伟 周永章 杨志军 聂凤军 何俊国 李文 |
| 作者单位： | 1. 中山大学地球环境与地球资源研究中心,广东,广州,510275;中山大学地球科学系,广东,广州,510275 2. 中国地质科学院矿产资源研究所,北京,100037 3. 中山大学地球环境与地球资源研究中心,广东,广州,510275 |
| 基金项目： | 国家科技部“973”项目（2002CB412606）、国家自然科学基金项目（40573019）、全国高等学校博士点基金项目（20040558050）资助.致谢：在野外考察过程中得到西藏地勘局郑有业教授、李金高高级工程师等的热情指导和帮助,在此致以真诚的感谢. |
| 摘 要： | 西藏南部广泛发育中生代古海洋沉积硅质岩,在空间上集中分布于雅鲁藏布江缝合带和喜马拉雅沉积带,呈东西向条带状分布,断断续续延伸达数千公里。可大致厘定出3条硅质岩带:缝合带蛇绿岩北侧早白垩世硅质岩带、缝合带蛇绿岩南侧三叠纪至白垩纪硅质岩带和喜马拉雅沉积带白垩纪硅质岩带,产出块状、层状、角砾状和结核状4种类型的硅质岩。在沉积建造特征上,缝合带蛇绿岩北侧硅质岩带以蛇绿岩-硅质岩建造为主;缝合带蛇绿岩南侧硅质岩带主要以火山岩-硅质岩建造和改造型硅质岩建造为主;喜马拉雅沉积带硅质岩则以浊积岩-硅质岩建造为特征。藏南硅质岩具有重要的研究意义,其薄弱环节和科学问题主要包括:硅质岩的成因问题、硅质岩的微组构问题、硅质岩中的古海洋沉积事件信息、硅质岩对沉积环境的指相意义等。 |
| 关 键 词： | 硅质岩 沉积建造 特提斯 西藏南部 雅鲁藏布江缝合带 |
| 文章编号： | 1671-2552（2007）04-0492-10 |
| 收稿时间： | 2006-07-12 |
| 修稿时间： | 2/7/2007 12:00:00 AM |
Chert in southern Tibet, China: its field geological features and related scientific problems |
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| FU Wei,ZHOU Yong-zhang,YANG Zhi-jun,NIE Feng-jun,HE Jun-guo,LI Wen.Chert in southern Tibet, China: its field geological features and related scientific problems[J].Geologcal Bulletin OF China,2007,26(4):492-501. | |
| Authors: | FU Wei ZHOU Yong-zhang YANG Zhi-jun NIE Feng-jun HE Jun-guo LI Wen |
| Abstract: | As a prominent type of paleoceanic sediment, cherts occur widely in southern Tibet. According to the spatial and temporal distributions, three chert belts are identified in the Yarlung Zangbo suture and Himalaya sedimentation zone: the Early Cretaceous chert belt in the north of ophiolite of the suture (here referred to as the N-chert belt for short), the Triassic-Cretaceous chert belt in the south of ophiolite (here referred to as the S-chert belt for short) and the Cretaceous chert belt in the Himalaya sedimentation zone (here referred to as the H-chert belt for short). In these chert belts, various petrological characteristics are discriminated, but four types of chert are more reprehensive: massive chert, bedded chert, breccia chert and nodular chert. In the N-chert belt, ophiolite-chert formations are dominant; the volcanic-chert formation and reworked chert formations predominate in the S-chert belt; the H-chert belt is characterized by turbidite-chert formations. The chert in southern Tibet has great scientific value but weak points and problems as well, such as the petrogenesis and microfabric features of chert, information of paleo-oceanic sedimentary events in chert and facies implications of chert for the sedimentary environment. |
| Keywords: | chert sedimentary formation Tethys southern Tibet Yarlung Zangbo suture |
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