摘要
通过地质与地球化学资料的综合分析 ,揭示出胶辽地块古元古代前造山期深部地质过程主要为岩浆底板垫托作用 ,且具有 3个特性 ,即幕式活动性、样式不对称性及空间上向南的迁移规律。受这一深部过程影响 ,在壳内引起了 2 .4Ga的基性岩墙侵位事件 ,古元古代裂谷带中双峰式火山活动 (2 .4~ 1 .9Ga) ,巨量早期二长花岗岩的形成与侵位 (主要为 2 .2~ 1 .9Ga) ,二长花岗岩的侵位又引发盖层内改造型滑脱变形 (2 .2~ 1 .9Ga) ,伴生顺层伟晶岩脉事件及低压高温变质和垂向顺层递增变质带等特殊拉张变质现象。
Systematic analyses of geology and geochemistry revealed that the Paleoproterozoic pre\|orogenic deep processes in the Jiao\|Liao Massif might be mainly magma underplating, which was characterized with episodic activities, asymmetric patterns and southward tectonic migration. To be controlled by this deep process occurred the mafic magma emplacement yielding an age about 2.4 Ga, the bimodal volcanism of rift\|type during 2.4 Ga to 1.9 Ga, and emplacement of the large monzogranitic magma during 2.2 Ga to 1.9 Ga. The emplacement of monzogranite triggered bedding\|parallel sliding deformation of the sedimentary cover during 2.2 Ga to 1.9 Ga, which was accompanied with the pegmatitic veins of lit\|par\|lit injection, the lower\|pressure and higher\|temperature metamorphism, and the vertical bedding\|parallel progressive metamorphism (a special metamorphic phenomenon related to extension).