江西岩背斑岩锡矿区火山侵入杂岩稀土元素特征和成岩模拟  

REE Characteristics and Petrogenic Models of the Volcanic-Intrusive Complex in the Yanbei Porphyry Tin Ore District

作　　者：刘昌实[1] 沈渭洲[1] 熊小林[1] 王德滋[1] 

机构地区：[1]南京大学地球科学系

出　　处：《岩石矿物学杂志》1994年第3期193-203,共11页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金

摘　　要：以岩背斑岩锡矿区火山侵入杂岩为例，根据稀土元素Ｃｅ，Ｎｄ，Ｅｕ，Ｙｂ等５种元素６种不同式样协变关系（元素－元素，比值－比值）的判别，重建了本区火山侵入杂岩成岩机制。结果认为，本区第一旋回酸性岩浆是由华南加里东褶皱区基底（云开群）Ｆ＝０．３的聚集熔融形成的。未喷出地表的那一部分岩浆经历了Ｆ＝０．２的分离结晶作用形成本区残余的花岗质熔体。Taking the volcanic-intrusive complex in the Yanbei porphyry tin oredistrict as an example and based on the covariance plots of Ce,Nd,Sm,Eu,Yb in six different elemont-element,ratio-ratio coordinates,the authors havereestablished the petrogenic mechanism of the volcanic-intrusive complex inthis district.The results suggest that the melt of the first acidic magmaticcycle was formed as a result of accumulativo melting of basement rocks in South China(F=0.3).A part of acidic magma of the first cycle which wasnot extruded onto the surface might be crystallized in fractional crystalliz-ation state at depth,leading to the formation of residual granitic melts(F=0.2).

关 键 词：杂岩 稀土族 成岩模拟 斑岩 锡矿床 

分 类 号：P588.36[天文地球—岩石学]