摘要
笔者通过地球化学经典国解和参数研究了耀岭河群基性火山岩的地球化学特征、构造环境、物源及岩石成因。研究表明，该基性火山岩为稳定－半稳定环境下的张性岩套，喷发物源可能是经原始地幔交代的富集型洋中脊玄武岩，具地慢热栓的特点，显示古板块分别向西南和北东方向扩张。其构造环境属继承早期陆内裂谷发展而成边缘海盆地的大陆边缘裂谷带。
Through classic geochemical diagrams and indices, the author studies the geochemical characters, relaed tectonic setting, source of magma and petrogenesis of the basic volcanics in yaolinghe Gr.. The results show that the rocks is belong to the rock suite being result of crustal extension under stable and semistable environment. The eruptive source material may be the enriched basalt at oceanic ridge, which is metasomatized by the mantle and is characterized with mantle thermal plume. It indicates that the paleoplates extended toward SW and NE respectively and the teclonic setting is of the characteristics of the epicontinental rift of marginal oceanic basin inherited from early continental rift.
关键词
耀岭河群
张性岩套
地幔热栓
裂谷
Yaolinghe Group. Geochemistry, Diagram, Extensional setting's rock suite. Mantle thermal plume. rift.
