赣南—粤北白垩纪火山岩的地球化学特征及其成因机制讨论  

A Discussion on the Origin and Geochemical Characteristics of Cretaceous Volcanic Sequences in South Jiangxi and North Guangdong

作　　者：张树明[1] 巫建华[1] 周维勋[1] 左跃明[1] 李清龙[1] 

机构地区：[1]华东地质学院,江西临川344000

出　　处：《地质论评》1999年第S1期712-716,共5页Geological Review

摘　　要：通过对赣南—粤北白垩纪火山岩地球化学特征研究,得出火山岩系形成于一种过渡性构造环境(介于强烈挤压与强烈伸展之间)。其中,基性火山岩形成于走滑相对伸展环境,岩浆源自较深部,具亏损地幔性质;酸性火山岩形成于走滑相对挤压环境,岩浆源自较浅部,以壳源组分为主。它们共同构成过渡性岩浆杂岩建造。Through discussion and analysis of the geochemical characteristics of Cretaceous volcanic rocks in south Jiangxi and north Guangdong,it is concluded that volcanic rocks are formed in a transitional tectonic environment (between the highly compressed and the highly extended). Basic volcanic rocks occur in a relatively extensional environment. The magma comes from the depth with a depleted mantle nature. Acid volcanic rocks are formed in the relatively compressed environment. The magma comes from the shallow parts and is dominatedby crustal compositions. Together they constitute the intermediate magmatic complex formation.

关 键 词：地球化学 构造环境 火山岩源区 白垩纪 赣南—粤北 

分 类 号：P588.1[天文地球—岩石学]