tholeiitic basalt造句

• Given their oib - type trace element pattern and depleted sr - nd isotop ic composition , the datong alkali basalts are interpreted to be generated within the asthenospheric mantle but at a shallow depth compared to the yangyuan alkali basalts . the datong tholeiitic basalts exhibit low snd values ( 1 - 4 ) . their sr - pb and nd - pb isotopic correlations are consistent with a mixing between the depleted mantle and emi - like component
  大同地区第四纪时期同时产出碱性和拉斑玄武岩，碱性玄武岩也主要来自于软流圈地幔，岩浆起源深度小于阳原样品；拉斑玄武岩具有较低的nd ( nd = 1 - 4 ) ， pb - nd以及pb - sr同位素相关关系暗示其可能是dm和型富集地幔( emi )组分之间混合的结果，反映了软流圈和岩石圈地幔之间的相互作用，岩浆起源较浅。