女山超镁铁岩包体及其形成的温压条件  

NüSHAN ULTRAMAFIC NODULES AND THEIR ZENETIC PRESSURE TEMPERATURE CONDITIONS

作　　者：李有柱[1] 

机构地区：[1]西安地质学院资源与材料工程系

出　　处：《矿物岩石》1997年第1期7-16,共10页Mineralogy and Petrology

摘　　要：安徽女山含有丰富的超镁铁岩包体，它们赋存在两种寄主岩中。根据副矿物种类不同可分为Ｓｐ－二辉橄榄岩、Ｈｂ－二辉橄榄岩和Ｇａ－二辉橄榄岩。本区超镁铁岩包体在地幔中遭受不同的地质事件局部熔融、变形作用和重结晶作用。笔者采用几种不同的方法对本区包体形成的温压条件进行了估算，其形成的温度ｔ／℃为１０２８～１２２３，压力ｐ／ＧＰａ为１．４３～３．５７。本区上地幔的形成与Ｒｉｎｇｗｏｏｄ的模拟地幔岩（Ｐｙｒｏｌｉｔｅ）成分接近。There are so many ultramafic nodules which including Sp lherzolite,Hb lherzolite and Ga lherzolites etc,in Nüshan Area,Anhui.Most of nodules are associated with two kinds of volcanic host rocks, such as:pyroclastic rocks and lava. All nodules in this region was undergon various geological events;partly melt,deformation and recystallization.Their genetic pressure temperature conditions were calculatecl by several methods,i.e.1.43￣3.57 Gpa and 1 028￣1 223℃,respectively. It is very closed to each others,the compositions of the upper mantle in this region with that of pyrolite which simulated by Ringwood and also closed to that of the upper mantle in other region of E China.

关 键 词：二辉橄榄岩包体 温压条件 超镁铁岩包体 铁质岩 

分 类 号：P588.242[天文地球—岩石学] P588.125[天文地球—地质学]