upper asthenosphere

基本解釋

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.
輝石巖類捕虜體母巖漿來自于含有陸殼物質(zhì)的軟流圈及其上部巖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.
這也許正是根據(jù)現(xiàn)今應(yīng)縣—商河剖面上大地電磁的探測結(jié)果看不出來存在通常所說的反映“軟流圈”電性特征的“上地幔高導(dǎo)層”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.
古近紀(jì)（老第三紀(jì)）伸展活動期，斷裂帶在上地幔的伸展剪切及同時(shí)的軟流圈上涌、巖石圈拆沉是該階段玄武巖漿活動的主要原因。