摘要
前人基于岩石地球化学数据构建了多种构造背景判别图解用于区分洋内岛弧和陆缘弧,并得到了广泛应用。但最近研究表明基于岩石地球化学数据建立的构造背景判别图解可信度不高。基于此,本文收集了GEOROC和PetDB数据库中的全岩地球化学数据,以验证已有的判别图解的有效性和可靠性。研究结果表明可信度较高的判别图解主要与Th、Ta有关,其余图解不具普遍性。
Many discriminant diagrams of tectonic setting have been constructed by predecessors based on petrogeochemical data in order to distinguish between intra-oceanic island arc and continental margin arc. But the study indicates that the reliability of these discriminant diagrams is not high. Thus, this study verifies the validity and reliability of these discriminant diagrams by the available petrogeochemical data from GEOROC and PetDB databases. The results indicate that the most reliable discriminant diagrams are mainly related to Th and Ta and the rest of the diagrams are not universal.
作者
熊佳杰
李嘉诚
徐柳林
陈昶钢
XIONG Jia-jie;LI Jia-cheng;XU Liu-lin;CHEN Chang-gang(College of Earth Sciences,Chengdu University of Technology,Chengdu 610059)
出处
《四川地质学报》
2022年第2期321-324,共4页
Acta Geologica Sichuan
关键词
洋内岛弧
陆缘弧
数据挖掘
构造背景判别
intra-oceanic island arc
continental margin arc
tectonic setting discrimination
