基于GEOROC和PetDB全球岩石地球化学数据库的洋内岛弧和陆缘弧构造背景判别研究  

Discrimination of Tectonic Setting between Intra-Oceanic Island Arc and Continental Margin Arc Based on GEOROC and PetDB Global Petrochemical Database

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)

机构地区：[1]成都理工大学地球科学学院,成都610059

出　　处：《四川地质学报》2022年第2期321-324,共4页Acta Geologica Sichuan

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.

关 键 词：洋内岛弧 陆缘弧 数据挖掘 构造背景判别 

分 类 号：P595[天文地球—地球化学]