收稿日期: 2005-05-08
修回日期: 2006-02-15
网络出版日期: 2006-06-15
The Tectonic Settings Discrimination of the Basalts in the Convergent Margin of Plate by Th, Nb and Zr
Received date: 2005-05-08
Revised date: 2006-02-15
Online published: 2006-06-15
根据Th、Nb、Zr的地球化学性质和判别机理，利用世界上典型大地构造环境区玄武岩类的Th、Nb、Zr数据，研究了Th、Nb、Zr判别玄武岩大地构造环境的地球化学机理，发现不同构造环境区玄武岩系的Th、Nb、Zr特征具有显著差异，其比值特征能将玄武岩形成的大地构造位置很好地划分出来。提出了板块汇聚边缘玄武岩大地构造环境的Nb/Zr-Th/Zr判别图，该图不但能较好地区分出板块汇聚边缘中的洋—洋俯冲带、洋—陆俯冲带及陆—陆碰撞带，同时还能反映出岛弧区大地构造环境演化的趋势。
关键词： 玄武岩; 大地构造环境; Th/Zr-Nb/Zr判别图; 板块汇聚边缘
黄润秋 , 孙书勤 , 张成江 . 板块汇聚边缘玄武岩大地构造环境的Th、Nb、Zr判别[J]. 地球科学进展, 2006 , 21(6) : 593 -598 . DOI: 10.11867/j.issn.1001-8166.2006.06.0593
Based on the geochemical property and the discrimination principle, we used the data of Th, Nb and Zr of basalts formed from typical tectonic setting of the world, studied the geochemical identification principle of tectonic setting of basalt using Th, Nb and Zr, and found that the characteristics of Th, Nb and Zr of basalts in different tectonic settings had evident difference. The ratios among Th, Nb and Zr could divide the type of tectonic setting where the basalts were derived from their mantle source. The paper proposed the tectonic settings Nb/Zr-Th/Zr ratio discrimination diagram of the basalts in the convergent margin of plate. The diagram could not only divide the collision zone of ocean-ocean, the collision zone of ocean-continental and the collision zone of two continental plates at the margin of convergent plate, but also reflect the evolutional trend of tectonic setting of island arc basalts.
Key words： Basalts; Tectonic setting; Th/Zr-Nb/Zr identification diagram.
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