upper asthenosphere

基本解释

The parental magma for pyroxenite xenoliths could be derived from the partial melting of the asthenosphere with continental crust material involvement and of the upper lithospheric mantle.
辉石岩类捕虏体母岩浆来自于含有陆壳物质的软流圈及其上部岩石圈地幔的部分熔融。
That is one of the possible reasons why there is no "high-conductive layer of the upper mantle" in the MT profile from Yingxian to Shanghe, which images the asthenosphere electrical characters.
这也许正是根据现今应县—商河剖面上大地电磁的探测结果看不出来存在通常所说的反映“软流圈”电性特征的“上地幔高导层”的原因。
At the stage of Eogene extensional activity, extensional shearing at upper mantle and asthenosphere upwelling and lithosphere delamination were the main causes of the basaltic magma activity.
古近纪（老第三纪）伸展活动期，断裂带在上地幔的伸展剪切及同时的软流圈上涌、岩石圈拆沉是该阶段玄武岩浆活动的主要原因。