鲁东荣成片麻岩套及其成因

LUDONG RONGCHENG GNEISS SUITE AND ITS ORIGIN

摘要:

荣成片麻岩套是华北地块南缘的苏北－鲁东片麻岩带的一部分，是一套花岗闪长质－二长花岗质的钙碱性深成岩。其岩石化学成分与Ａｍｉｔｓｏｇ片麻岩相似。稀土元素显示出具负Ｅｕ异常，有较高的稀土总量及轻、重稀土分馏较强的特征。根据稀土元素定量模拟计算，荣成片麻岩套是由斜长角闪岩源岩经４２％的部分熔融形成，相应的残留体是榴辉岩。

Abstract:

Rongcheng gneiss suit is a portion of Subei Ludong gneiss belt in Southe marg in of Northe china block and belongs to calc alkaline plutonic rocks with granodioritic admelliticcomposition, The petro chemical compositions are similar to Amfstog gneiss.The vare earthelements reveal negative Eu anormaly, higher ΣREE and relative strong fractionation of lightREE from heavy REE. Based on the quantitative mOdeling calculation Rongcheng gneiss suite wasformed from the 42% partial melting of amphibolite sour...