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对西准噶尔及周边地区壳幔结构的研究是揭示准噶尔盆地演化的重要基础.利用最新的卫星重力场模型,通过计算得到西准噶尔及周边地区的布格重力异常,进而采用三维反演技术,对西准噶尔及周边地区的地壳与上地幔顶部进行密度成像,得到了0~80km深度范围的密度异常结构.地壳密度分布显示古准噶尔洋壳有可能向NE和NW分别俯冲于西伯利亚板块和西准噶尔地块之下.上地幔顶部密度变化表明:阿尔泰褶皱带具有相对较低的密度,可能为古大陆巨厚的硅铝层所致;哈萨克斯坦-准噶尔盆地具有相对完整的高密度结构;天山褶皱带区域的密度大幅度变化刻画了超岩石圈断裂对岩石圈的切割以及岩石圈形变与构造活动的痕迹.
The study of the crust and mantle structure in West Junggar and the surrounding areas is an important basis for revealing the evolution of the Junggar Basin.Bug’s gravity anomaly in the West Junggar and surrounding areas is calculated by using the latest satellite gravity field model, Density imaging of the top of crust and upper mantle in western Junggar and surrounding areas resulted in density anomalies ranging from 0 to 80 km in depth.The crustal density distribution shows that the paleo-Junggar oceanic crust may subduct NE and NW respectively in the Siberian plate and the West Junggar The variation of density at the top of the upper mantle indicates that the Altay fold belt has a relatively low density, possibly due to the thick siliceous-aluminous layer of the ancient continent, Kazakhstan-Junggar basin has a relatively complete high-density structure, and the Tianshan fold belt The sharp changes in the density of the region depict the cutting of lithosphere by lithospheric faults and the traces of lithospheric deformation and tectonic activity.