|Table of Contents|

Characteristics of Sedimentary Strata and Their Forming Environments of Nanhuan Period-Early Paleozoic of Back-Longmenshan in the Northwest Margin of Yangtze Block(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第02期
Page:
117-124
Research Field:
基础地质与矿产地质
Publishing date:

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
Author(s):
LI Zuo-chen1; 2; PEI Xian-zhi1; 2; LIU Zhan-qing2; LI Rui-bao1; 2; DING Sa-ping2; ZHANG Xiao-fei2; CHEN Guo-chao2; LIU Zhi-gang2; CHEN You-xin2; WANG 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
Keywords:
northwest margin of Yangtze Block;  Back-Longmenshan tectonic belt;  Nanhuan Period-Early Paleozoic;  sedimentary environment;  aulacogen
PACS:
P54;P53
DOI:
-
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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Last Update: 2011-06-20