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丽江—西昌—新市镇爆炸地震测深研究结果表明,有利于攀西地区可能是一个古裂谷带的论断。地壳结构在垂向上为层状、横向上被几条深断裂分割为断块状,地壳平均厚度 55km、速度6.18—6.34km/s。其特点是:一、莫氏面下存在一个壳-幔过渡带,厚度16— 23km,层速度7.5—7.8km/s;二、地壳上中部存在一个低速层,厚度5—12km,层速度5.7— 5.8km/s。这个低速层在川滇南北构造带轴部呈上隆状态,顶界埋深10—14km,两侧下倾。总之,本文认为构造带轴部低速层的上隆、下地壳的增厚和壳-幔过渡带的存在,可能是大陆裂谷的残迹。
Lijiang - Xichang - New Town explosion seismic sounding study results show that is conducive to the Panxi area may be an ancient rift zone assertion. The crustal structure is stratified in the vertical direction and is divided into blocks by several deep faults in the horizontal direction. The crust has an average thickness of 55km and a velocity of 6.18-6.34km / s. Its characteristics are: 1. There is a crust-mantle transitional zone beneath the Mohs surface with a thickness of 16-23km and a layer velocity of 7.5-7.8km / s. 2. There is a low-velocity layer in the middle of the crust with a thickness of 5-12km and a layer velocity of 5.7 5.8km / s. The low-velocity layer in the north-south Sichuan-Yunnan tectonic belt uplift state, the top buried depth of 10-14km, both sides down. In summary, the paper suggests that the uplift of the lower velocity zone with the shaft and thickening of the lower crust and the existence of the crust-mantle transition zone may be the remnants of the continental rift.