赞比亚西北省卢阿玛拉地区变质基性岩中角闪石矿物特征研究

Research on Amphibole of Basic Rock in Luamala Area Northwestern Province Zambia

角闪石作为赞比亚西北省卢阿玛拉地区基性岩中的主要变质特征矿物,其详细的成因矿物学研究对解释该套岩体的变质变形特征和条件具有一定的意义。应用电子探针分析和角闪石温压计,对该区基性岩中角闪石进行了成分分析和温压条件的研究。研究表明该区基性岩中角闪石为铁韭闪石,大部分为变质作用成因,少部分为蚀变和交代成因。通过角闪石温压计计算得出其压力为600~900 MPa,变质温度大约为545~667℃。角闪石的成因矿物学研究表明基性岩的变质程度为绿帘石-角闪岩相。变质作用发生在卢菲里安造山运动,是与挤压推覆有关的中压高温型条件。

Genesis research on amphibole,a mineral with metamorphic characteristics of basic rock in Northwestern province Zambia,has significant assist for the explanation of the deformation characteristics and conditions metamorphism.we analyzed the elements and studied the temperature-pressure condition for amphibole from the basic rock by using electron microprobe,amphibole geothemobarometer and manometer.Results show that amphibole from the basic rock is Ferropargasite,mostly with metamorphism,few with alteration and metasomatism,under the pressure from 600 to 900 MPa,at the metamorphic temperature from 545℃to 667℃.The rock of metamorphic grade is mainly epidote-amphiboles facie.The metamorphism occurred in Lufilian Orogeny,was of middle-pressure high-temperature type,correlated with compression and nappe tectonic.