摘要
元素和Nd同位素地球化学研究表明,分布于南秦岭陕西柞水-镇安地区原定名为耀岭河群的变质火山岩组合形成于俯冲带岛弧环境,与具大陆裂谷环境特征并同属南秦岭的鄂西北耀岭河群火山岩区别明显。根据野外地质关系和Nd同位素限制,该套岛弧火山岩应形成于元古宙晚期。镇安岛弧火山岩的厘定,表明部分原耀岭河群中存在不同构造性质甚至不同时代的岩浆岩组合。
A suite of volcanic rocks with arc magmatic affinities in geochemistry is recognized from the Zhenan area in Shaanxi Province, South Qinling. The suite is thought to be comparative with those of Yaolinghe Group in Hubei Province, which are regarded as resulted from within plate magmatisms of the Neoproterozoic. Though a sound constraints on its chronology are not available yet,the evidently difference between the Zhenan and Hubei Yaolinghe volcanic suites in geochemistry, however, suggests that some volcanic suites of South Qinling, which were former described as Yaolinghe Group, in Shaanxi Province are hybrid in terms of both times and tectonic affinities.
出处
《地球化学》
CAS
CSCD
北大核心
2002年第3期222-229,共8页
Geochimica
基金
国家自然科学基金(49873010
49794043)
国土资源部科技项目(20001010203)
西北大学大陆动力学教育部重点实验室开放课题基金
关键词
厘定
岛弧火山岩
地球化学
构造意义
岩石成因论
耀岭河群
陕西
arc volcanic suite
geochemistry
tectonic significance
petrogenesis
Yaolinghe Group
Shaanxi Province
