| 扬子地块西北缘后龙门山南华纪—早古生代沉积地层特征及其形成环境 |
| |
| 引用本文： | 李佐臣1,2,裴先治1,2,刘战庆2,李瑞保1,2,丁仨平2,张晓飞2,陈国超2,刘智刚2,陈有2,王学良2. 扬子地块西北缘后龙门山南华纪—早古生代沉积地层特征及其形成环境[J]. 延边大学学报(自然科学版), 2011, 0(2): 117-124 |
| |
| 作者姓名： | 李佐臣1 2 裴先治1 2 刘战庆2 李瑞保1 2 丁仨平2 张晓飞2 陈国超2 刘智刚2 陈有2 王学良2 |
| |
| 作者单位： | 1.长安大学 西部矿产资源与地质工程教育部重点实验室,陕西 西安 710054; 2.长安大学 地球科学与资源学院,陕西 西安 710054 |
| |
| 摘 要： | 通过对扬子地块西北缘后龙门山构造带南华纪—早古生代沉积地层的分析研究,综合运用岩石学、沉积特征分析的手段,结合与前龙门山构造带、碧口地块、米仓山构造带和汉南地块的沉积特征对比,探讨后龙门山构造带南华纪—早古生代的沉积环境,查明其形成环境。结果表明:在南华纪—早古生代后龙门山构造带沉积环境可分为南华纪—震旦纪裂解-稳定沉积和早古生代伸展裂陷沉积两个阶段,其中在早古生代伸展裂陷阶段后龙门山构造带经历了裂解→抬升→局部裂解→抬升→裂解的反复过程,最终形成了志留系茂县群裂陷槽沉积,主要沉积了一套代表伸展裂陷环境的沉积岩系,并有少量的陆内火山岩系。研究结果进一步证实,龙门山构造带在南华纪—早古生代总体是一个陆内裂谷带,不发育与古缝合线相关的构造混杂岩和蛇绿混杂岩带,是在陆内裂谷的基础上于印支期—燕山期形成的陆内造山带。
|
| 关 键 词： | 扬子地块西北缘 后龙门山构造带 南华纪—早古生代 沉积环境 裂陷槽 |
Characteristics of Sedimentary Strata and Their Forming Environments of Nanhuan Period-Early Paleozoic of Back-Longmenshan in the Northwest Margin of Yangtze Block |
| |
| LI Zuo-chen1,' target="_blank" rel="external">2,PEI Xian-zhi1,' target="_blank" rel="external">2,LIU Zhan-qing2,LI Rui-bao1,' target="_blank" rel="external">2,DING Sa-ping2,ZHANG Xiao-fei2,CHEN Guo-chao2,LIU Zhi-gang2,CHEN You-xin2,WANG Xue-liang2. Characteristics of Sedimentary Strata and Their Forming Environments of Nanhuan Period-Early Paleozoic of Back-Longmenshan in the Northwest Margin of Yangtze Block[J]. Journal of Yanbian University (Natural Science), 2011, 0(2): 117-124 |
| |
| Authors: | LI Zuo-chen1,' target=" _blank" rel=" external" >2,PEI Xian-zhi1,' target=" _blank" rel=" external" >2,LIU Zhan-qing2,LI Rui-bao1,' target=" _blank" rel=" external" >2,DING Sa-ping2,ZHANG Xiao-fei2,CHEN Guo-chao2,LIU Zhi-gang2,CHEN You-xin2,WANG Xue-liang2 |
| |
| Affiliation: | 1. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China; 2. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China |
| |
| Abstract: | Through the research on sedimentary strata of Nanhuan Period-Early Paleozoic of Back-Longmenshan tectonic belt in the northwest margin of Yangtze Block with the methods of petrology and sedimentary strata, the sedimentary and forming environments of Nanhuan Period-Early Paleozoic of Back-Longmenshan tectonic belt were discussed based on the contrast of sedimentary characteristics of Fore-Longmenshan tectonic belt, Bikou Block, Micangshan tectonic belt and Hannan Block. The results indicated that the sedimentary environments of Nanhuan Period-Early Paleozoic of Back-Longmenshan tectonic belt could be divided into two stages, including the division-stable stage of Nanhuan-Sinian Period and the extension and division-collapse stage of Early Paleozoic; Back-Longmenshan tectonic belt had the repetitive process of divergence→lifting→partial divergence→lifting→divergence during the extension and division-collapse stage of Early Paleozoic; aulacogen sedimentary in Maoxian Group of Silurian System, which represented the extension and division-collapse environment, was eventually formed, and there was a little intra-continental volcanic rocks. The results further confirmed that Back-Longmenshan tectonic belt in general was an intra-continental rift belt during Nanhua Period-Early Paleozoic and an intra-continental orogenic belt based on the intra-continental aulacogen in Indosinian-Yanshanian Period, and did not develop tectonic and ophiolitic melange belts related with the ancient suture. |
| |
| Keywords: | northwest margin of Yangtze Block Back-Longmenshan tectonic belt Nanhuan Period-Early Paleozoic sedimentary environment aulacogen |
|
| 点击此处可从《延边大学学报(自然科学版)》浏览原始摘要信息 |
|
点击此处可从《延边大学学报(自然科学版)》下载免费的PDF全文 |
|
