铜陵中酸性侵入岩同源包体特征及岩浆动力学  

Characteristics of Cognate Inclusions in Intermediate-Acid Intrusive Rocks of Tongling Area and Their Magmatic Dynamics

作　　者：周珣若[1] 吴才来[1] 黄许陈[2] 张成火[2] 

机构地区：[1]中国地质大学,北京100083 [2]安徽省地矿局321地质队,铜陵244033

出　　处：《岩石矿物学杂志》1993年第1期20-31,共12页Acta Petrologica et Mineralogica

基　　金：国家计委基金;地矿部〈七.五〉国家科技攻关项目(75-55-02);高等学校博士学科点专项科研基金

摘　　要：铜陵地区中生代中酸性侵入岩的钙碱性系列岩石中,发育同源浅源包体(闪长质微粒包体),而碱性系列岩石中发育同源深源包体(辉石岩和角闪石岩)。它们在矿物化学、稀土微量元素地球化学特征方面与其寄主岩石具有相似性,但在形成的物理化学条件和岩浆动力学特征方面存在一定的差异。反映了它们是同源岩浆在不同岩浆作用阶段的产物,即深源包体来自深位岩浆房中的堆积岩碎块,而浅源包体则来自浅位岩浆房的冷凝边碎块。The Mesozoic intermediate--acid intrusive rocks in Tongling area havewithin them lots of cognate inclusions, with rocks of calc--alkaline series contai- ning shallow--source inclusions(particulate dioritic ones)whereas those of alkalineseries containing deep--source inclusions(pyroxinite and hornblendite ones). Theseinclusions are similar. to their host rocks in mineral chemistry and geochemistryof rare earth elements and trace elements but somewhat different from them inphysical--chemical conditions for their formation and magmatic dynamic features.This suggests that they are comagmatic. products. formed under different condi-tions, that is, the shallow--seated inclusions came from the chilled border of theupper magmatic chamber while the deep--seated inclusions from the accumula-tive rocks of the lower magmatic chamber.

关 键 词：侵入岩 酸性 矿物包体 岩浆 动力学 

分 类 号：P588.12[天文地球—岩石学]