| 摘要: |
| 在构造解释及断层受力机制分析的基础上,根据逆断层两盘剥蚀与沉积的关系,将哈密坳陷逆断层活动的地质模型归纳为单向逆冲型、逆冲生长型和基底抬升型,并提出针对这3种类型逆断层活动量的计算方法,对主要断层在印支期、燕山期和喜山期的活动强度进行研究。结果表明:火石镇凹陷内的断层在印支期活动最为强烈,燕山期断层活动变弱,喜山期只有南部边界断层活动增强;三堡凹陷内的断层在印支期开始活动,燕山期断层活动最为强烈,喜山期断层基本停止活动;断层活动的差异性直接影响着各凹陷构造格局的形成与演化,火石镇凹陷构造格局早在印支运动就基本定型,而三堡凹陷的构造格局在晚燕山运动后才最终定型。 |
| 关键词: 哈密坳陷 逆断层 地质模型 断层活动性 断层演化 |
| DOI：10.3969/j.issn.1673-5005.2013.04.001 |
| 分类号::TE 121.2 |
| 基金项目:国家自然科学基金项目(41190072;41072152);中央高校财政南海专项联合资助项目(201021003) |
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| Activities and evolution of thrust faults in Hami depression, Tu-Ha Basin |
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JIANG Su-hua1, SONG Chuan-hui1, LI San-zhong1,2, ZHANG Hong-yan1, YANG Xiao-jie1
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(1.College of Marine Geoscience in Ocean University of China, Qingdao 266100, China;2.Key Laboratory of Submarine Geosciences and Exploration Techniques, Ministry of Education, Qingdao 266100, China)
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| Abstract: |
| Based on the interpretation of seismic profiles and analysis of fault pattern, three different geological models named single-force thrusting, double-force slipping and basement uplifting were proposed by analyzing the relationship between denudation and sedimentation at the two sides of the fault in Hami depression. Three test fault activity formulas for those different models were given to calculate vertical displacements of the major faults during the Indosinian, the Yanshanian and the Himalayan periods. The results show that the thrusting in Huoshizhen sag is intensive during the Indosinian period, but became weaker and weaker during the Yanshanian period, the activity of fault enhanced only in the south boundary during the Himalayan period. While the thrusting in Sanbao sag initiated during the Indosinian period, and became more intensive during the Yanshanian period, then terminated during the Himalayan period. Differentiation of the fault activity in different sags directly control the formation and evolution of the structural patterns in these sags. The tectonic framework of Huoshizhen sag basically developed during the Indo-china movement, while that of Sanbao sag finally developed after the Yanshanian movement. |
| Key words: Hami depression thrust fault geological model fault activity fault evolution |
