Ultraslow spreading ridges:slowest but locally thickest  

作　　者：Chuan-Zhou Liu Ri-Xiang Zhu 

机构地区：[1]Laoshan Laboratory,China [2]State Key Laboratory of Lithospheric and Environmental Coevolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,China

出　　处：《National Science Review》2024年第11期31-32,共2页国家科学评论（英文版）

摘　　要：The mid-ocean ridge(MOR)is the longest volcanic chain on the Earth,with a total length of-75000 km and spread-ing rate varying from fast(>80 mm/yr)to ultraslow(<20 mm/yr).At the MOR,divergence leads to decompressional melting of the asthenosphere,producing melts for crustal accretion.Geophysical observations on global ocean ridges have revealed that seismic crustal thickness shows little dependency on spreading rate until it is<20 mm/yr,with a global average of 6±1 km.Such a constancy in thickness has been perfectly explained by a passive flow model,in which the hot buoyant asthenosphere rises passively to the melting zone.

关 键 词：CRUSTAL OCEAN THICK 

分 类 号：P467[天文地球—大气科学及气象学]