| 青藏高原西南部南北向构造研究的新见解 |
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| 引用本文： | 雍永源.青藏高原西南部南北向构造研究的新见解[J].沉积与特提斯地质,2012(3):21-30. |
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| 作者姓名： | 雍永源 |
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| 作者单位： | 成都地质矿产研究所 |
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| 摘 要： | 广泛分布在青藏高原西南部的南北向构造,是高原新生代陆内汇聚变形的重要组成部分。经过中外学者40余年研究,至今已取得许多重要进展并形成了一些共识,也存在若干分歧。作者对南北向构造研究及某些共识的不同意见是：①南北向构造不仅有伸展构造形迹,还有褶皱、逆断、叠加等挤压构造形迹;②不能用裂谷系代表所有的伸展构造,也不能用裂谷系、地堑系等伸展构造名称代表高原西南部的全部南北向构造形迹。建议采用＂南北向构造＂这一包容性强的中性名称;③南北向构造最早产生于始新世-渐新世;④首先产生南北向伸展构造的是藏北羌塘-青南地区而非喜马拉雅地区;⑤大致在渐新世末-中新世初,青藏高原曾出现过一次短暂的东西挤压应力场,生成了各式挤压构造变形形迹。本文的新见解既丰富了南北向构造的成份与内涵,又可以此将南北向构造划分为早期（E2-3）伸展、中期（E3末-N1初）挤压、晚期（中新世及以后）再伸展3个发生、发展期。
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| 关 键 词： | 青藏高原 南北向构造 新见解 |
| 收稿时间： | 2012/9/28 0:00:00 |
The NS-trending structures in the southwestern part of the Qinghai-Xizang Plateau: New insights |
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| Yong Yong-yuan.The NS-trending structures in the southwestern part of the Qinghai-Xizang Plateau: New insights[J].Sedimentary Geology and Tethyan Geology,2012(3):21-30. |
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| Authors: | Yong Yong-yuan |
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| Institution: | Yong Yong-yuan(Chengdu Institute of Geology and Mineral Resources,Chengdu 610081,Sichuan,China) |
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| Abstract: | Nunerous studies conducted in the southwestern part of the Qinghai-Xizang Plateau in the last decades have revealed that there has been considerable progress but still debate concerning the NS-trending structures in this vast area. These NS-trending structures represent an important part of the Cenozoic intracontinental convergent deformation on the Plateau. Some aspects of views from the author in the present paper are suggested as follows. （ 1 ） The NS-trending structures consist of not only the extensional structures but also the compressional structures such as folds, overthrust faults and superimposed structures. （2） The terminology rift systems can＇ t be applied to represent all of the extensional structures, and the rift systems and graben systems also can＇ t represent all of the NS-trending structural features. Instead, the NS-trending structures are herein suggested. （3）The NS-trending structures in the study area were initiated during the Eocene to the Oligocene. （4）The NS-trending extensional structures were initiated in the northern Xizang to southern Qinghai zone rather than in the Himalayas. （5）A phase of temporary EW-trending compressional stress field once occurred on the Plateau during the latest Oligocene to the earliest Miocene, and resulted in the formation of various compressional structures. The NS-trending structures outlined above show a long and complex history, with early initiation and development spanning three phases of extension during the middle and late Eogene,compression during the latest Eogene to the earliest Neogene, and re- extension during the Miocene or later. |
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| Keywords: | Qinghai-Xizang Plateau NS-trending structure new insight |
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