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Geochemical Characteristics of HIMU-Type Oceanic Island Basalts

Xiaoju Wang

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Abstract

The elemental and isotope geochemical characteristics of oceanic island basalts can be used to trace chemical structure andchemical evolution of the deep mantle. HIMU(Highμ,μ=238U/204Pbt=0)-type basalt is a kind of oceanic island basalts which has uniqueelemental and isotopic composition and is thought to be directly associated with recycled oceanic crust in the mantle plume. Therefore,the genesis of HIMU basalts is a long-term topic of the mantle plume(hot spot) researches. This paper summarizes the geochemicaldefinition, distribution, stages of volcanic evolution and changes in lithology of HIMU-type ocean island basalts.Furthermore, wediscuss the differences of the source compositions and genesis between classical HIMU basalts and other intraplate basalts against their elemental, radiogenic isotopic compositions and noble gas isotopic compositions.

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What this paper is about

The elemental and isotope geochemical characteristics of oceanic island basalts can be used to trace chemical structure andchemical evolution of the deep mantle. HIMU(Highμ,μ=238U/204Pbt=0)-type basalt is a kind of oceanic island basalts which has uniqueelemental and isotopic composition and is thought to be directly associated with recycled oceanic crust in the mantle plume. Therefore,the genesis of HIMU basalts is a long-term topic of the mantle plume(hot spot) researches. This paper summarizes the geochemicaldefinition, distribution, stages of volcanic evolution and changes in lithology of HIMU-type ocean island basalts.Furthermore, wediscuss the differences of the source compositions and genesis between classical HIMU basalts and other intraplate basalts against their elemental, radiogenic isotopic compositions and noble gas isotopic compositions.

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Available abstract

The elemental and isotope geochemical characteristics of oceanic island basalts can be used to trace chemical structure andchemical evolution of the deep mantle. HIMU(Highμ,μ=238U/204Pbt=0)-type basalt is a kind of oceanic island basalts which has uniqueelemental and isotopic composition and is thought to be directly associated with recycled oceanic crust in the mantle plume. Therefore,the genesis of HIMU basalts is a long-term topic of the mantle plume(hot spot) researches. This paper summarizes the geochemicaldefinition, distribution, stages of volcanic evolution and changes in lithology of HIMU-type ocean island basalts.Furthermore, wediscuss the differences of the source compositions and genesis between classical HIMU basalts and other intraplate basalts against their elemental, radiogenic isotopic compositions and noble gas isotopic compositions.

Key concepts: Basalt, Geology, Geochemistry, Radiogenic nuclide, Mantle (geology), Mantle plume, Oceanic crust, Volcano

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