| 释义 |
Mafic rocks
基本例句
基性岩
The discriminant figures of tectonic setting show that themafic rockswas formed in seamount setting.通过地球化学图件判别，认为该基性杂岩形成于洋中脊的构造环境。
Themafic rocksof the Early Palaeozoic ophiolite are mainly N-MORB, minorly T-MORB.早古生代蛇绿岩中辉长岩、辉绿岩和玄武岩等镁铁质岩主要具N-MORB性质，少量具T-MORB性质。
Their geochemical characteristics of trace elements and Nd and Sr isotopes show that thesemafic rockserupted in a back-arc basin.根据镁铁质岩的层位关系、岩浆来源和微量元素特征，可将该盆地的地质演化概括为扩张阶段和封闭阶段。
Themafic rocksare geologically and chemically similar to the Permian Emeishan continental flood basalts and have experienced no mineralization, with normal content of ore-forming elements.后者在地质特征和地球化学特征上与峨眉山玄武岩相似，成矿元素含量正常。
At present,mafic rocksfrom the lower crust in the Dabie Mountains or even in the northern Yangtze plate have been scarce, which may be delaminated and recycled into underlying convecting mantle.大别山造山带乃至扬子板块北缘现今缺乏厚层镁铁质下地壳，它们也很少出露地表，推测这些俯冲的镁铁质下地壳可能已拆离再循环进入地幔。 |