摘要
从稀土元素特征来看,闽南中生代侵入岩物质来源,应来自陆壳,其中上部陆壳占有较大比例。燕山早期第二次侵入岩为上、下部陆壳混熔产物,第三、四次侵入岩为上部陆壳局部重熔产物,燕山晚期第一、二次侵入岩主要来自下部陆壳、混熔部分上部陆壳物质,第三次侵入岩则以稀土元素亏损熔体的下部陆壳为主,可能有部分上地幔物质加入,第四次侵入岩为晚期残余熔浆结晶产物。岩石的形成方式燕山早期侵入岩为部分熔融作用,晚期第一、二次侵入岩则为源岩熔融后经分离结晶作用形成的,第三次晶洞钾长花岗岩是同熔成因。
According to the characteristics of REE, the materials source made up the Mesozoic intrusions in the south Fujian are resulted from the continental crust. And a large proportion of these intrusions are from upper continental crust. Early Yanshanian intrusion of 2nd stage are products of syntexis of upper and lower continental crust, The 1st stage and the 2nd stage intrusions of Late Yaushanian are mostly from the lower continental crust, but are mixed with material of upper cortinental crust. The 3rd stage intrusion of Yanshanian came dominantly from lower continental crust with the reduction of REE, and must be mixed with the materials from upper mantle. The 4th stage intrusion of Yanshanian was fromed by cry- stallization of the residue magma. The genesis of the Early Yanshanian inteusions is partial melting and that is of 2nd stage intrusion of Late Yanshanian in the melting of source rocks and differentiation crystallization. The genesis of the 3rd stage myrmekitic-Kgranitic is syntexis.
出处
《福建地质》
1989年第4期263-274,共12页
Geology of Fujian
