从重磁场特征探讨南北构造带北段与地震带的统一性
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摘要
从分析地球物理场特征着手,提出将南北向重力梯级带和重磁场特征东西差异作为划分南北构造带的依据,探讨了形成南北构造带的区域与深部地质构造背景以及地震成带分布的对应关系。重力梯级带反映的南北构造带既有与中轴构造一致的继承性,又有向西拓展的新生性,并在南北统一成带的基础上叠加了分段性,形成南压北张不同背景的控震、控热机制,同时也是构成青藏高原东界和我国大陆构造域东西分界线,对应着狭义南北地震带。
Starting with an analysis of the characteristics of the geophysical field,this paper puts forward the evidence for determining the NS-trending tectonic zone on the basis of the east and west differences of NS-striking gravity gradient zone and gravity-magnetic field characteristics,and investigated the regional and deep geological-structural background for the formation of NS-trending tectonic zone as well as the corresponding relationship of the zoned distributions of the earthquakes.The NS-trending tectonic zone reflected by the gravitational gradient zone has not only inheritance manifested by its consistency with the central axis structure but also newborn nature of westward expansion.In addition,there exists the superimposition of the segmentation on the basis of the unified NS-trending zone.It forms the earthquake-controlling and heat-controlling mechanism in different backgrounds of southward compression and northward expansion.It also constitutes the east-west dividing line between the eastern boundary of the Tibetan Plateau and China's continental tectonic domain,corresponding to the narrow sense NS-striking seismic zone.
Starting with an analysis of the characteristics of the geophysical field,this paper puts forward the evidence for determining the NS-trending tectonic zone on the basis of the east and west differences of NS-striking gravity gradient zone and gravity-magnetic field characteristics,and investigated the regional and deep geological-structural background for the formation of NS-trending tectonic zone as well as the corresponding relationship of the zoned distributions of the earthquakes.The NS-trending tectonic zone reflected by the gravitational gradient zone has not only inheritance manifested by its consistency with the central axis structure but also newborn nature of westward expansion.In addition,there exists the superimposition of the segmentation on the basis of the unified NS-trending zone.It forms the earthquake-controlling and heat-controlling mechanism in different backgrounds of southward compression and northward expansion.It also constitutes the east-west dividing line between the eastern boundary of the Tibetan Plateau and China's continental tectonic domain,corresponding to the narrow sense NS-striking seismic zone.
引文
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[2]李玉龙,侯珍清,康哲民.中国西北陕甘宁青(E90°～111°、N32°～42°)地震区划[M].兰州:甘肃人民出版社,1986.
[3]梁桂培,李渭娟.南北地震带北段深部构造特征[J].地震学报,1990,12(2).
[4]徐锡伟,于贵华,马文涛.中国大陆中轴构造带地壳最新构造变动样式及其动力学内涵[J].地学前缘,2003,10(特刊).
[5]丁燕云,李占奎.中国北部深层构造之我见[J].物探与化探,2000,24(1).
[6]甘肃省地质矿产局.甘肃省区域地质志[M].北京:地质出版社,1989.
[7]闵祥仪,周民都.灵台—阿木去乎剖面地壳速度结构[J].西北地震学报,1991,13(增刊):29-36.
[8]李松林,张先康,张成科.玛心—兰州—靖边地震测深剖面速度结构的初步研究[J].地球物理学报,2002,45(2).
[9]孙武城,徐杰,杨主恩,等.上海奉贤至内蒙古阿拉善左旗地学断面[M].北京:地震出版社,1992.
[10]李清河,郭守年,吕德徽.鄂尔多斯西缘与西南缘深部结构与构造[M].北京:地震出版社,1999.
[11]郭守年,李勇.南北地震带北段地壳上地幔电性结构及有关资料问题的讨论[J].西北地震学报,1999,21(3).
[12]张岳桥,马寅生,杨农,等.西秦岭地区东昆仑—秦岭断裂系晚新生代左旋走滑历史及其向东扩展[J].地球学报,2005,26(1).
[13]袁道阳,张培震.青藏高原东北缘晚第四纪活动构造的几何图像与构造转换[J].地质学报,2004,78(2).
[14]李百祥.甘肃西秦岭地区地球物理场特征及其地质解释[G]//勘查地球物理勘查地球化学专集:21.北京:地质出版社,1999.
[15]周民都,吕太乙,张元生.青藏高原东北缘地质构造背景及地壳结构研究[J].地震学报,2000,22(6).
[16]张守训,李百祥.天水及其南北一带温泉分布的地质—地球物理特征[J].西北地震学报,2006(3).
[17]张季生,高锐.龙门山及邻区重、磁异常特征及与地震关系的研究[J].地球物理学报,2009,52(2).
[18]王谦身,滕吉文,张永谦.四川中西部地区地壳结构与重力均衡[J].地球物理学报,2009,52(2).
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