Abstract
Petrochemistry of Volcanic Rocks in Relation to The Formation of Island Arcs
Highlights
The two main types of lavas: oceanic and continental, are connected in space to the corresponding types of the Eearth's crust, but petrochemical peculiarities are independent of local geological features and structure of upper layers of the crust
Magmatic harts of volcanoes are located in the upper part of the mantle and petrochemical features reflect the changes in chemistry of subcrustal substance
Calk-alkali magma of island arcs is derivative one and it is generated by the contamination of the oceanic magma with sialitic material upflowing from depths of the mantle
Summary
As it is known the volcanic rocks of island arcs have a pronounced calc-alkali character. In the direction from island arcs to the ocean a sharp substitution of calc-alkalic rocks by alkaline lavas characteristic for all oceanic islands (a series of rocks from picrite-basalts and nepheline basalts to trachytes) takes place.
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