摘要
吉林省南部早太古宙上壳岩是太古宙高级区的组成部分,它包括变质火山岩和变质沉积岩,其中各类变质火山岩的地球化学特征与康迪统计的太古宙同类岩石大致可此。本区上壳岩随SiO_2含量增高,ΣREE逐渐增高。各类岩石普遍具Ce、Eu的负异常,表明它们具相同的成岩环境。
The early Archean supracrustal rocks in southern Jilin are an important part of the Archean high-grade region and includes the metamorphic volcanics and metamorphic sedimentary rocks in which the geochemical characteristics of all metamorphic volcanic rocks are comparable with the Archean analogue proposed by K. Condy. In the supracrustal rocks, ∑REE increases graually with the content of SiO_2. There is a negative loss of the Ce and Eu in all the recta-volcanic rocks, indicating that their diagenetic conditions are the same.
出处
《吉林地质》
1991年第2期23-30,共8页
Jilin Geology
关键词
上壳岩
地球化学
早太古宙
火山岩
Supracrustal rocks Meta-volcanic rocks Metasedimentary rocks REE distribution pattern
