地幔(Mantle)介于莫霍面和古登堡面之间,厚度在2800km以上,平均密度为4.59g/cm³,体积约占地球体积的82.26%, 地幔的质量约占地球总质量的67.0%,在很大程度上影响了地球物质的总组成。地幔的横向变化比较均匀,根据地震波速度的变化以1000km激增带为界面(雷波蒂面),进一步划分出上地幔和下地幔两个次一级圈层。
n. mantle
misc. earth's mantle
这些热岩石的储层聚集在地幔的底部。
Reservoirs of this hot rock collect in the base of the mantle.
由于靠近地核,地幔底部的岩石比上地幔岩石的温度高得多。
Because of its proximity to Earth's core, the rock at the base of the mantle is much hotter than rock in the upper mantle.
这样形成的“地幔柱”一旦形成,就会继续从地幔底部引导热物质,直到储层被排空。
The "mantle plume" thus formed, once established, continues to channel hot material from the mantle base until the reservoir is emptied.
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