地质科学2017，Vol.52Issue(3)：693-713,21.DOI:10.12017/dzkx.2017.044
全球大陆弧玄武岩(CAB)的特征——与岛弧玄武岩(IAB)和弧后玄武岩(BAB)的对比
Global active continental margin arc basalt (CAB)characteristics: Compared with island arc basalt (IAB)and back-arc basin basalt (BAB)
摘要
Abstract
The active continental margin arc basalt (CAB) occurred mainly in Andes,it is generally considered that CAB is same as island arc basalt (IAB) roughly and basically they are in flocks in many discrimination diagrams,but the degree of enriched LILE and depleted HFSE is different silightly.In this paper,showing that CAB is enriched in LILE,however it is not very obviously for Nb-Ta depletion.CAB is different from IAB in the latest big data discrimination diagrams,instead plotting in IAB region,CAB plots in the transition region between IAB and OIB.CAB retains lots of OIB traces,indicating that plate subduction is accompanied by the magma from the deep mantle,resulting the OIB traces in CAB.We also find that the back-arc basin basalt of the Andes arc occurs OIB traces,rather than MORB features.According to the idea of big data,this paper discusses the characteristics of CAB and compared with IAB and BAB preliminary,showing that CAB is significantly different from IAB and it has the characteristics of both IAB and OIB,but the deep understanding needs a further study in the future.关键词
大陆弧玄武岩/岛弧玄武岩/弧后玄武岩/安第斯/大数据/判别图Key words
Active continental margin arc basalt/Island arc basalt/Back-arc basin basalt/Andes/Big data/Discrimination diagrams分类
天文与地球科学引用本文复制引用
李玉琼,张旗,王金荣,刘欣雨,陈万峰..全球大陆弧玄武岩(CAB)的特征——与岛弧玄武岩(IAB)和弧后玄武岩(BAB)的对比[J].地质科学,2017,52(3):693-713,21.基金项目
中国科学院地质与地球物理研究所岩石圈演化国家重点实验室项目(编号:81300001)资助. （编号:81300001）
