| 青海湖的地质构造前景及形成演化 |
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| 引用本文： | 边千韬,刘嘉麒.青海湖的地质构造前景及形成演化[J].地震地质,2000,22(1):20-26. |
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| 作者姓名： | 边千韬 刘嘉麒 |
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| 作者单位： | 中国科学院地质与地球物理研究所!北京100029 |
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| 摘 要： | 青海湖地区位于３个构造单元及多条深断裂的交汇部位，结构复杂，强度较弱。上新世出现断陷，中更新世成湖。湖盆可划分为３个地垒和３个次级断陷盆地。其形成和演化受中祁连南缘大断裂带、宗务隆山－青海南山大断裂带和黑马河－达晶大带重新活动及其它ＮＷＷ，ＮＷ，ＮＮＷ，ＳＮ，ＮＥ抽断裂的活动及伴随的差异隆升所控制，与青藏高原的隆升演化有密切关系，尤其是可能与青藏高原发生后造山伸展作用有关的应力场转变造成的负反转构
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| 关 键 词： | 青海湖 地质背景 新构造 形成演化 断裂 |
GEOTECTONIC SETTING, FORMATION AND EVOLUTION OF THE QINGHAI LAKE |
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| Bian Qiantao,Liu Jiaqi,Luo,Xiaoquan,Xiao Jule.GEOTECTONIC SETTING, FORMATION AND EVOLUTION OF THE QINGHAI LAKE[J].Seismology and Geology,2000,22(1):20-26. |
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| Authors: | Bian Qiantao Liu Jiaqi Luo Xiaoquan Xiao Jule |
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| Abstract: | The Qinghai Lake area is situated at the juncture of 3 tectonic units and several deep faults, so tectonic deformafion is exfensive there. Fault depression took place in Pliocene and the Qinghai Lake formed in Middle Pleistocene. The Lake basin can be divided into 3 horsts and 3 second-order fault basins. The formation and evolution of the Qinghai Lake had been mainly controlled by removement of south marginal large fault belt of Middle Qilian block, ZhongwulongshanQinghainanshan large fault belt and HeimaheDari large fault belt, the movement of faults with strikes in NWW, NW, NNW, SN and NE, and regional differential uplifting as well. Its formation and evolution had close relationship with uplifting of Qinghai-Tibet plateau, especially with negative inversion structure formed by change of stress field in Middle Pleistocne. Since the formation of Middle Miocene leveling plane, the neotectonism and the formation and evolution process of the Qinghai Lake are characterized by obvious pulsation. Since Middle Miocene, neotectonic activities over Qinghai Lake area can be divided into 5 periods, and the formation and evolution of the Qinghai Lake can be divided into 9 stages. |
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| Keywords: | Qinhai Lake Tectonic setting Neotectonism Differential uplifting |
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