青藏高原东北缘似三联点构造的初步研究
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摘要
从深部构造的角度对青藏高原东北缘似三联点构造进行了探讨。人工地震资料反演结果表明,该区的地壳结构与其它地区明显不同Moho面为一复杂的过渡带,而不是尖锐的速度间断面;在该区内存在一组弧形构造,各弧形断层在形态、规模和破碎程度方面的差异,反映了青藏高原块体向东北方向强烈的挤压作用及其传递过程。
The quasi tri-junction in the northeastern margin of the Qinghai-Tibet plateau is discussed from the viewpoint of deep structures. Results inversed from deep seismic sounding data show that the crustal structure of this quasi tri-junction is quite different from the other regions. In this region, the Moho is a complicated transitional zone rather than a sharp discontinuity. Furthermore, there is a set of arcuate tectonic zones. The differences of the arcuate fault zones in shape, scale and fractured extent indicate the strong compression from the Qinghai-Tibet plateau toward the NE direction and its transmission process.
The quasi tri-junction in the northeastern margin of the Qinghai-Tibet plateau is discussed from the viewpoint of deep structures. Results inversed from deep seismic sounding data show that the crustal structure of this quasi tri-junction is quite different from the other regions. In this region, the Moho is a complicated transitional zone rather than a sharp discontinuity. Furthermore, there is a set of arcuate tectonic zones. The differences of the arcuate fault zones in shape, scale and fractured extent indicate the strong compression from the Qinghai-Tibet plateau toward the NE direction and its transmission process.
引文
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5 Institute of Geology,CEA and Earthquake Administration of Ningxia Hui Autonomous Region.Haiyuan active fault system[M].Beijing:Seismological Press,1990.(in Chinese)
6 李松林,张先康,张成科,赵金仁,成双喜.玛沁-兰州-靖边地震测深剖面地壳速度结构的初步研究[J].地球物理学报,2002.45(2):274~281.
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2 卢演俦,丁国瑜.华北地区地块相对运动几何学的初步研究[A].地震地质论文集[C].天津:天津科学技术出版社,1986.
2 Lu Yanchou and Ding Guoyu.Ageometric study on the rela-tive motions between blocks in North China[A].SelectedPapers of Geology and Seismology[C].Tianjin:Scientific and Technological Press of Tianjin,1986.(in Chinese)
3 田勤俭,丁国瑜.青藏高原东北隅似三联点构造特征[J].中国地震,1998,14(4):27~35.
3 Tian Qinjian and Ding Guoyu.The tectonic feature of a qua-si-trijunction in the northeastern corner of Qinghai-Tibet plat-eau[J].Earthquake Research in China,1998,14(4):27-35.(in Chinese)
4 国家地震局《鄂尔多斯周缘活动断裂系》课题组.鄂尔多斯周缘活动断裂系[M].北京:地震出版社.1988.
4 Program Group of Active Fault System in the Rim of Ordos Block,CEA.Active fault system in the rim of Ordos block[M].Beijing:Seismological Press,1988.(in Chinese)
5 国家地震局地质研究所,宁夏回族自治区地震局.海原活动断裂带[M].北京:地震出版社,1990.
5 Institute of Geology,CEA and Earthquake Administration of Ningxia Hui Autonomous Region.Haiyuan active fault system[M].Beijing:Seismological Press,1990.(in Chinese)
6 李松林,张先康,张成科,赵金仁,成双喜.玛沁-兰州-靖边地震测深剖面地壳速度结构的初步研究[J].地球物理学报,2002.45(2):274~281.
6 Li Songlin,Zhang Xiankang,Zhang Chengke,et al,A pre-liminary study on the crustal velocity structure of Maqin-Lanzhou-Jingbian by means of deep seismic sounding profile[J].Chinese J.Geophys.,2002.45(2):274~281.(in Chinese)
7 Mereu R F.The complexity of the crust from refraction/wide angle reflection data[J].Pure Appl.Geophys.,1990,132(1/2):269-288.
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