| 汾渭裂谷系与造山带耦合关系及其形成机制研究 |
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| 引用本文： | 邢作云,赵斌,涂美义,邢集善.汾渭裂谷系与造山带耦合关系及其形成机制研究[J].地学前缘,2005,12(2):247-262. |
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| 作者姓名： | 邢作云 赵斌 涂美义 邢集善 |
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| 作者单位： | 中国地质大学,北京,100083;中国地质大学,湖北,武汉,430074;山西地质勘探局,物理化学勘察研究院,山西,运城,044004;中国地质大学,湖北,武汉,430074 |
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| 基金项目： | 中国地质调查局勘测项目 |
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| 摘 要： | 试图运用盆山耦合等地学理论,对汾渭裂谷系进行初步的定量半定量研究。认为在区域拉张应力场作用下,汾渭裂谷系为盆山耦合形成,其形成模型为“伸展造山,断陷沉盆,后推成台”;运用盆内沉积与造山带剥蚀量互补法、地震剖面拟合法、裂变径迹法等计算方法对其进行计算的结果表明,铲式断裂一侧造山带隆升与盆地下沉呈完全镜像对称关系。同时对大同一带新生代玄武岩特征进行了分析,认为软流圈上涌是该带玄武岩喷发的根源,并通过对该区地震层析和大地电磁测深的剖析,推断汾渭裂谷系主体形成机制应为被动机制,而其北部的桑干河断陷形成机制则为主动机制。此外,对汾渭裂谷系的地热资源及地震震中分布规律等进行了探讨。
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| 关 键 词： | 盆山 上涌 软流圈 裂谷形成机制 |
| 文章编号： | 1005-2321(2005)02-0247-16 |
| 修稿时间： | 2004年12月8日 |
The formation of the Fenwei rift valley |
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| XING Zuo-yun,ZHAO Bin,TU Mei-yi,XING Ji-shan.The formation of the Fenwei rift valley[J].Earth Science Frontiers,2005,12(2):247-262. |
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| Authors: | XING Zuo-yun ZHAO Bin TU Mei-yi XING Ji-shan |
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| Abstract: | From a quantitative and semi-quantitative research on Fenwei rift valley system,we suggest that basin-mountain dichotomy of the rift valley system was formed under a regional extensional stress field. The model is that the mountain, basin, and platform were formed by extension, subsidence, and tectonic push, respectively. We have studied the relationship between basin sedimentation, orogenic denudation, modeling of a seismic section, and fission-track method, to calculate the basin-mountain dichotomy of the Fenwei rift valley system. The results show that the fault-uplift of side orogen and the subsidence of basin are a mirror-image symmetry. We have also analyzed the features of Cenozoic basalt of Datong, and point out that the upwelling asthenosphere was the source of the eruption of the basalt. We propose that the Fenwei system is a passive rift, and that of the Sangganhe fault is an initiative system. Moreover, we also discussed the geothermal resources and the epicenter distribution of Feiwei rift valley system. |
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| Keywords: | basin-mountain uplift asthenosphere rift formation mechanism |
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