地学前缘 ›› 2015, Vol. 22 ›› Issue (3): 215-226.DOI: 10.13745/j.esf.2015.03.019

• 中国中部盆地构造演化与油气 • 上一篇    下一篇

南北构造带北部石炭纪东西沉积边界分合演变及其地质意义

郭佩, 刘池洋, 王建强, 邓煜, 赵晓辰, 王磊, 张小龙, 王文青   

  1. 西北大学 大陆动力学国家重点实验室; 西北大学 地质学系, 陕西 西安 710069
  • 收稿日期:2014-05-08 修回日期:2014-10-10 出版日期:2015-05-15 发布日期:2015-05-15
  • 作者简介:郭佩(1990—)，女，硕士，从事盆地动力学、油气地质与勘探等研究工作。E-mail:nwupeig@126.com
  • 基金资助:

    中国地质调查局项目(12120113039900，12120114009201)；国家自然科学基金项目(41330315，91214301，90814005)；国家科技重大专项(2011ZX05001004，2011ZX05023001002)；西北大学大陆动力学国家重点实验室科学技术部专项

Sedimentary boundary evolution of the Carboniferous in Northern NorthSouth Tectonic Belt, China and its geological significance.

 GUO  Pei, LIU  Che-Xiang, WANG  Jian-Jiang, DENG  Yu, DIAO  Xiao-Chen, WANG  Lei, ZHANG  Xiao-Long, WANG  Wen-Jing   

  • Received:2014-05-08 Revised:2014-10-10 Online:2015-05-15 Published:2015-05-15

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摘要：

南北构造带是中国大陆地质构造及深部过程和地表系统的重要分界线，也是地震活动的多发地带，对其在前中生代是否存在、不同时期各区带的构造属性和联系研究薄弱。文中以南北构造带北部为研究对象，重点讨论其中南段，探讨研究区石炭纪地质构造特征及其与具分区意义的南北构造带形成演化的联系。研究表明，在石炭纪，今南北构造带北部所在地区处于伸展裂陷环境，断裂活动强烈，总体控制着河西走廊—北祁连沉积域的东界和隆拗格局及沉积厚度等变化。南北构造带北部及其西沉积区的断裂活动和沉积演化，经历了前黑山期初始裂陷、臭牛沟期进一步(向北)扩张、土坡期沉积沉降鼎盛及太原期衰减4个阶段。其中于晚石炭世土坡晚期(本溪期)和太原期，东(华北)、西沉积域的沉积范围均向南北构造带北部扩展，先后经历了北部连通到全部相通的演变过程。石炭纪各期诸断裂与中、新生代断裂在位置和方向上具有明显的相关性，反映二者成生和演化联系密切。南北构造带北部及邻区，在石炭纪主要时期分隔华北和河西走廊—北祁连两大沉积域，东、西沉积域的沉积边界在该区带的分合演变和建造特征及断裂的主控因素，显示该区带在石炭纪已属具明显分区作用的重要地质构造单元，为此后南北构造带北部的进一步发展演化和重要的构造地位奠定了基础。

关键词: 南北构造带北部, 宁南地区, 石炭纪, 沉积构造演化, 地质意义

Abstract:

NorthSouth Tectonic Belt is an important boundary of Chinese Mainland geological structure, of deep geologic processes and of surface system, which is also an earthquakeprone zone. Yet there is little or even less research about its existence before the Mesozoic and about its tectonic feature and connection between different regions in different period. By studying the Northern NorthSouth Tectonic Belt and focusing on its central and south part, this article discusses the Carboniferous geological structure and its connection to the formation and evolution of NorthSouth Tectonic Belt which has regionalization effect. During the Carboniferous, the Northern NorthSouth Tectonic Belt was in an extensional rifting environment with intense fault activities, and it controlled the east boundary, structural pattern and thickness of Hexi CorridorNorth Qilian sedimentary domain. Its fault activities and sedimentary evolution underwent four stages: Qianheishan initial rifting period, Chouniugou further expanding period (northward), Tupo flourishing period and Taiyuan attenuating period. In the late Tupo period (Benxi) and Taiyuan period, the east (North China) and west sedimentary domain both expanded to the north part of the NorthSouth Tectonic Belt where the boundary was partly connected in its north part and later totally connected. The faults in the Carboniferous have obvious relevance to the MesoCenozoic ones in location and direction, which means that their formation and evolution was related closely. In the Carboniferous, the Northern NorthSouth Tectonic Belt and its neighborhood divided the sedimentary ranges of North China and Hexi CorridorNorth Qilian. The separationtounion evolution of sedimentary boundary, structural feature and main controlling factors showed that this zone was an important geological tectonic unit with obvious partition function in the Carboniferous, and it would have laid the foundation of further evolution of NorthSouth Tectonic Belt and of its important tectonic status.

Key words: Northern NorthSouth Tectonic Belt, South Ningxia, Carboniferous period, sedimentarytectonic evolution, geological significance

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