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[1]李佐臣,裴先治,刘战庆,等.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].地球科学与环境学报,2011,33(02):117-124.
 LI Zuo-chen,PEI Xian-zhi,LIU Zhan-qing,et al.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 Earth Sciences and Environment,2011,33(02):117-124.
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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(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第33卷
期数:
2011年第02期
页码:
117-124
栏目:
基础地质与矿产地质
出版日期:
2011-06-15

文章信息/Info

Title:
Characteristics of Sedimentary Strata and Their Forming Environments of Nanhuan Period-Early Paleozoic of Back-Longmenshan in the Northwest Margin of Yangtze Block
文章编号:
1672-6561(2011)02-0117-08
作者:
李佐臣12裴先治12刘战庆2李瑞保12丁仨平2张晓飞2陈国超2刘智刚2陈有2王学良2
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
Author(s):
LI Zuo-chen12PEI Xian-zhi12LIU Zhan-qing2LI Rui-bao12DING Sa-ping2ZHANG Xiao-fei2CHEN Guo-chao2LIU Zhi-gang2CHEN You-xin2WANG Xue-liang2
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
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
Keywords:
northwest margin of Yangtze Block Back-Longmenshan tectonic belt Nanhuan Period-Early Paleozoic sedimentary environment aulacogen
分类号:
P54;P53
DOI:
-
文献标志码:
A
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。
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.

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备注/Memo

备注/Memo:
收稿日期:2010-07-17
基金项目: 国家自然科学基金项目(40972136; 40572121; 40234041); 中央高校基本科研业务费专项资金项目(CHD2009JC046; CHD2009JC053; CHD2009JC070); 中国石油化工股份有限公司海相前瞻性研究项目(YPH08006)
作者简介: 李佐臣(1979-),男,陕西岐山人,讲师,理学博士,从事构造地质学和区域地质学研究。E-mail:lizuochen@chd.edu.cn

更新日期/Last Update: 2011-06-20