同化混染对五大连池石龙岩的影响及石龙岩成因探讨  

On the Contamination and the Petrogenesis of Shihlunite of Wadalianchi Volcanic Group,HeilongJiang Province

作　　者：张明[1] Zhang Ming

机构地区：[1]武汉地质学院北京研究生部

出　　处：《岩矿测试》1985年第3期193-201,I0001,I0002,共11页Rock and Mineral Analysis

摘　　要：黑龙江五大连池火山群钾质火山岩,曾被小仓勉(1936)定名为“石龙岩”。关于它的成因,除牛来正夫(1940)基于岩石中有大量熔蚀的花岗岩捕虏体及捕虏晶存在,认为它是钠质碱性玄武岩同化花岗岩形成的(以下称“同化说”)以外,别无详细的研究。The study of the mineralogical,petrochemical and geochemical variations of monzonito-granitic xenoliths resorbed in the shihlunite indicates that a fused mass,which is riched in potassium and other incompatible mantle elements,could not be produced by resorption oi these xenoliths.Accordinglly,it should be considered that the hypothesis proposed by Gorai,interpreting the shihlunite as a product of soda-alkalic basalt magma contaminating granite,could neither explain the petrochemical,geochemical and geological characteristics of shihlunite,nor consist with the conclusion of experimental petrology.It is indicated that shihlunite may have been derived from a kind of primary potassic magma which was formed as a result of lower degree of partial melting of phlogopite-rich mantle rocks in the deeer layer of the upper mantle.And the contamination of granite could only decrease the basicity of the rock.

关 键 词：五大连池火山群 碱性玄武岩 同化混染 石龙岩 钾质火山岩 捕虏体 钠质 捕虏晶 

分 类 号：P58[天文地球—岩石学]