Host: Abstracts of Annual Meeting of the Geochemical Society of Japan
Name : Abstracts of Annual Meeting of the Geochemical Society of Japan
Number : 69
Date : September 05, 2022 - September 16, 2022
Pages 70-
Petit-spot basalts are geochemically classified as oceanic island basalts (OIBs) influenced by the EM-1 component. The regional differences in trace element compositions of EM-1 OIBs provide clues to the heterogeneity of mantle and the conditions of origin of petit-spot magmas. In this study, the whole-rock trace element compositions of the world EM-1 OIBs are performed by principal component analysis to find characteristic elemental behaviors using the multidimensional elemental data. The selected principal components suggest that many hot spot volcanoes and some petit spot volcanoes are affected by different principal components. Petit-spot volcanoes on the NW Pacific Plate, Site C, were strongly influenced by both principal components. The relatively diverse compositions even in the same area suggest that petit-spot magmas originate from small-scale and heterogeneous mantle.
