Geochemistry of dike rocks of the Argentine Islands and the near area of the Antarctic Peninsula (Western Antractica)

1Artemenko, GV
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore-Formation of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2018, 6:73-82
Section: Geosciences
Language: Russian

The dike rocks in the area of the Argentine Islands and the near part of the Antarctic Peninsula by geochemical characteristics are mature island-arc matter of calc-alkaline formations that were formed moderate depths due to the melting of a metasomatic mantle source. The primitive (outgoing) melts are, probably, close by the composition to high-magnesium dike rocks. Variations in the composition of dike basites can be associa ted with the fractional crystallization with clinopyroxene admixtures dominant in liquidase to ∼ 5% by weight, and after — plagioclase, hornblende, and ore minerals (probably, titanomagntite). The products of deep mantle (plum) sources in the selected samples were not detected.

Keywords: Antarctic Peninsula, Argentine Islands, cumulates, dikes, multielement diagram, REE
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