地质通报2016，Vol.35Issue(12)：1937-1949,13.
全球岛弧玄武岩数据挖掘--在玄武岩判别图上的表现及初步解释
Global IAB data excavation:The perfor-mance in basalt discrimination diagrams and preliminary interpretation
摘要
Abstract
MORB, OIB and IAB (arc calc-alkaline basalt) have aroused much interest among geologists, with particular attention paid to igneous activities in island arcs related to plate subduction. Such island arcs can be divided into island arc and continental mar⁃gin arc (active epicontinental arc). This paper discusses the IAB, mainly focusing on the identification of IAB. The IAT (island arc tho⁃leiite) and the IAB are products of the fore-arc, the island arc and the rear-arc magmatism. Among them, the rear-arc is more di⁃versified in composition and is different from back-arc (back arc):the former belongs to the scope of the arc, while the latter is relat⁃ed to the subduction system in the kinetics of formation;nevertheless, the back-arc is an independent tectonic unit, although its mag⁃matism might still be affected by the subduction metasomatic fluids. Previous researchers made detailed studies of the IAB and put for⁃ward a variety of tectonic environment discrimination diagrams which have been widely used. In this paper, the authors tried to apply the global basalt data to verify the credibility of the discriminant figures. However, there only exist very few highly credible discrimi⁃nation diagrams, and these figures are mostly related to Th, Ta (Nb), and Ti elements, such as the figures of Hf-Th-Ta (Nb), Ti-Zr-Sr and Th/Yb-Ta/Yb, whereas the rest of the discriminant figures are of low credibility and characterized by multiple solutions, and hence should be used prudently. Researches show that the difference between the IAB and MORB, OIB mainly finds expression in the depletion of Nb-Ta , and this suggests that the most important criterion to distinguish the IAB from MORB and OIB is whether they are affected by subduction fluids or not.关键词
IAB/MORB/OIB/数据挖掘/判别图/岛弧/后弧Key words
IAB/MORB/OIB/data excavation/discrimination diagram/island arc/rear arc分类
天文与地球科学引用本文复制引用
杨婧,王金荣,张旗,陈万峰,潘振杰,杜雪亮,焦守涛,王淑华..全球岛弧玄武岩数据挖掘--在玄武岩判别图上的表现及初步解释[J].地质通报,2016,35(12):1937-1949,13.基金项目
甘肃省科技重大专项计划项目（编号1002FKDA042）和中央高校基本科研业务费专项资金项目 （）
