摘要
本文利用中国数字地震台网的资料,对昆仑山—柴达木盆地—秦岭—大别山纬向构造带的地壳及上地幔构造进行了研究。沿这一构造带沉积层平均厚度为8km,剪切波速度β=2.62km/s,壳内平均速度较低,为3.5km/s左右,在下地壳还存在低速层。地壳平均厚度为48km,自东而西相差不很大。上地慢低速层在70—90km深处开始出现。这种构造特征有别于地台和高原,具有块体间的过渡性质,表明这是中国地壳块体中的一个独立构造单元。
The crustal and upper mantle structure of Kunlun-Chaidamu-Qinling-Dabie tectonic zone is studied by using the data available from Chinese Digital Seismographic Network. The average thickness of sedimentary layer is about 8km with a shear wave velocity of 2.62km/s. It is noted that average velocity of 3.50km/s in the crust is relatively low, and there exists a low velocity layer in the lower crust. The undulation of the crustal thickness from East to West China is not great, being about 48km thick on average. The low velocity layer in the upper mantle appears at the depths of 70 to 90km. Such tectonic feature is different from both platform and the Tibetan plateau. Being a transition tectonic zone among geological blocks, it is indeed an independent tectonic unit of the crust in China.
出处
《西北地震学报》
CSCD
1989年第1期48-52,共5页
Northwestern Seismological Journal
