摘要
文章归纳了地壳上地幔各种岩石矿物的速度特征。长英质岩石的上地壳具有较低的P波速度;各类花岗质岩石到云英闪长质片麻杂岩组成的中部地壳P波速度为6.4～6.6km/s;由石榴石、角闪石、辉石或橄榄石组成的下陆壳P波速度最大,达到了6.8～7.0km/s,当P波速度大于7.3km/s时则应有相当高的榴辉岩和超镁铁岩的高速组分。在地壳下面的岩石圈地幔主要由橄榄岩质岩石(超镁铁岩)组成,地震波纵波速度达到8.0km/s以上。
The authors sum up the P-wave velocities of rock-forming minerals in the crust and the upper mantle. The felsic rocks that compose the upper crust have lower P-wave velocity, the P-wave velocity of the granitic and greisen-dioritic gneiss complexes that compose the middle crust is 6.4~6.6 km/s, and the lower crust rocks composed of garnet, amphibole, pyroxene and olivine have the highest P-wave velocity: 6.8~7.0 km/s. When P-wave velocity is higher than 7.3 km/s, there must exist high velocity components like eclogites and ultramafic rocks. The velocity of peridotite that makes up lithosphere mantle (ultramafic rocks) is higher than 8.0 km/s.
出处
《矿床地质》
CAS
CSCD
北大核心
2004年第S1期13-18,共6页
Mineral Deposits
基金
地质大调查综合研究项目"中国成矿体系与成矿评价"(K1.4)的资助
关键词
地震波速度
岩石矿物
地壳上地幔
综述
seismic velocity, rock-forming minerals, crust and mantle
