新疆富蕴—库尔勒剖面接收函数方法获得的地壳上地幔结构成像  

Image of Crust and Upper Mantle Structure along the Array from Fuyun to Kuerle by P-to-S Converted Waves

作　　者：李海鸥[1] 姜枚[2] 王亚军[2] 张立树[2] 于更新[1] 

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]中国地质科学院地质研究所大陆动力学实验室,北京100037

出　　处：《地质学报》2006年第1期135-141,T0004,共8页Acta Geologica Sinica

基　　金：国家"973"项目所属专题(编号2001CB409810)资助成果

摘　　要：利用远震接收函数方法处理宽频地震探测数据获得富蕴-库尔勒剖面地壳上地幔结构转换波成像。中天山南缘断裂下方自南向北Moho转换界面具有向北倾斜的特征，且此转换界面有间断，深度逐步由50km加大到60～70km。北天山北缘断裂北部下方相对连续的转换界面明显以较小的幅度向南俯冲延伸到80～90km深度。中天山南缘断裂到乌鲁术齐之间，除间断、斜交和叠置的Moho转换界面外，还可见其他转换界面。乌鲁木齐以北，进入准噶尔盆地Moho转换界面相对平缓深度在50km上下，最深处靠近天山附近。天山Moho面的加深、重叠以及地震发生的深度表明本区天山构造活动较强，天山的山根深度近100km。相对于天山西段本区南北向的推挤作用明显减弱。Teleseismic receiver functions, RFs, allow us to image the spatial variation of the converters in crust and upper mantle along the array from Fuyun to Kuerle. Some discontinuous north-dipping mantle converters are seen under Middle Tianshan South-edge Fault. The depths of such converters change gradually from 50 km to 60-70 km. A continuously south-dipping Moho converter expanding to 80--90 km with slight obliquity exists under the North Tianshan North-edge Fault. Relatively strong discontinuous and overlap Moho converters are not only one layer from Middle Tianshan south edge Fault to Wulumuqi. Strong converte about 50 km depth un- der Junggar basin is relatively even. Most large depth is near Tianshan Mountains. Large depth and overlap of Moho converters and depth of local earthquakes show structure activity is relatively strong. Depth of Tianshan mountain root is near to 100 km. The south-north extrusion in the region is much more weak than that in west part of Tianshan Mountains.

关 键 词：天山 接收函数 Moho面 深部构造 

分 类 号：P542.5[天文地球—构造地质学]