REE Abundaces in Megacrysts and Host Basalts：REE Behavior of Magma at High Pressures

Based on REE abundances in megacrysts and host basalts and their equilibrium conditions,it has proved that megacrysts may have been produced from the magma derived from the host rocks or of more basic composition.The REE ratios of megacrysts to host rocks may be taken as partition coefficients when both are equilibrium with each other.The crystal fractionation of megacrysts has caused the evolution of REE in the magma.It is obvious that some host basalts are the product of magma evolution after crystal fractionation.According to REE abundances in the host rocks and the partition coefficients between crystal and liquid,the history of crystal fractionation of magma can be traced.     

喀拉通克含矿岩体的微量元素与成岩构造环境

拉通克岩浆型硫化铜镍矿床产于新疆北准噶尔褶皱带，含矿岩体具有低ＴｉＯ２，高Ｋ２Ｏ，轻稀土富集以及亏损高场强元素的特征，与岛弧钙碱性玄武岩浆的微量元素特征相似，岩浆作用产生在西伯利亚板块和准噶尔板块碰撞后开始拉张环境，继承了岛弧岩浆作用的特征。     

新疆喀拉通克矿区二、三号硫化铜镍矿床及其外围地区的中基性岩体含矿性研究

对喀拉通克二、三号矿床的研究是为了取得本地区铜镍矿床成矿规律的认识,以便作为对其外围地区的中基性岩体进行铜镍含矿性评价的一个重要依据。本文所指的新疆喀拉通克矿区南矿床是指在矿区一、二及三号矿床(或岩体)。我们认为这三个岩体在距地表300米以下极可能是呈“藕节状”连通的,因而把三者看作一个整体,其中最具工业价值的一号矿床由另一子课题组进行研究。二、三号矿床未受剥蚀,为了解其形成演化机制提供了条件。     

云南某地基性岩岩石学上的一些问题

地质概述本文所述地区位于云南东南部,是华南地台上的一个凹陷带。区内泥盆系、石炭系、二迭系、三迭系、第三系及第四系均甚发育,塞武、奥陶系只在南部稍有出露。各系的特点均为由碎屑沉积(砂质页岩、页岩)渐渐过渡为纯化学沉积(石灰岩夹燧石透镜体或团块)。总厚度不超过3,500米。岩层褶曲平缓而开阔。区内大断裂甚多,较著者一为南北向,长30余公里;一为北西向,与前者约成45°角。