若羌-阿勒泰区域剖面的速度特征和地壳结构
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摘要
通过对天然地震转换波测深剖面和地震层析成象剖面速度资料的分析研究认为:以博罗科努-阿其克库都克断裂为界,其南为由上地壳层、中地壳层、下地壳层组成,具三层速度结构的陆壳;其北为仅有中地壳层、下地壳层,缺失上地壳层的洋壳。同时,根据速度层展布状况、相应位置、厚度变化等特征,将地壳结构划分为四种类型,即塔里木型、准噶尔型、天山叠置型和阿尔泰拆离型,并对这四种类型进行了重点描述。
The velocity data from seismic transformed wave bathymetric profile and seismic tomographic profile are analyzed and shown that Ruoqiang-Altai area possesses continental crust with three layers of velocity structures in south of Bolokenu-Aqikekuduk faulting,composed of upper,middle and lower crustal layers,and in north of the faulting,with two layers of velocity structures composed of middle and lower crustal layers,without marine crust of upper crustal layer.According to distributions,corresponding locations and thickness changes of these velocity layers,the crustal structure in this area can be divided into four types of Tarim,Junggar,Tianshan(superimposed type)and Altai(decoupling type).In-depth description of these four types of crustal structures is made in this paper.
The velocity data from seismic transformed wave bathymetric profile and seismic tomographic profile are analyzed and shown that Ruoqiang-Altai area possesses continental crust with three layers of velocity structures in south of Bolokenu-Aqikekuduk faulting,composed of upper,middle and lower crustal layers,and in north of the faulting,with two layers of velocity structures composed of middle and lower crustal layers,without marine crust of upper crustal layer.According to distributions,corresponding locations and thickness changes of these velocity layers,the crustal structure in this area can be divided into four types of Tarim,Junggar,Tianshan(superimposed type)and Altai(decoupling type).In-depth description of these four types of crustal structures is made in this paper.
引文
[1]陈俊湘,陈景亮.准噶尔盆地基底及其地震速度特征[J].新疆石油地质,2002,23(6):476-477.
[2]陈哲夫,成守德,梁云海,等.新疆开合构造与成矿[M].乌鲁木齐:新疆科技卫生出版社,1997.
[2]陈哲夫,成守德,梁云海,等.新疆开合构造与成矿[M].乌鲁木齐:新疆科技卫生出版社,1997.
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