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岩石学报  2001 

Th/Hf-Ta/Hf identification of tectonic setting of basalts
玄武岩类形成的大地构造环境的Th/Hf—Ta/Hf图解判别

Keywords: Basalt,Tectonic setting,Th/Hf,Ta/Hf identification diagram
玄武岩
,大地构造环境,Th/Hf-Ta/Hf判别图,花岗岩,岩浆岩,岩浆源区,钍/铪-钽/铪判别图

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Abstract:

Th, Ta and Hf are refractory strong magmatophile elements. Because that the geochemical behavior of Th, Ta and Hf is similar during magmatic action, the ratios of Th, Ta and Hf could restore processes of mantle partial, magmatic fractional crystallization, mantle fractionation and so on. The Th/Hf and Ta/Hf ratios of basalts, especially primary one, reflect the differentiation of Th, Ta and Hf of its source region. In general, there is a close relationship between these characteristics and tectonic setting. Based on the ratios among Th, Ta and Hf of basalts formed from typical tectonic setting of the world, we propose a new tectonic identification scheme of basalts on the Th/Hf and Ta/Hf double logarithmic plot.

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