Geochemical investigation of basalts from Trois Menestrels, Kerguelen Archipelago
Though the Trois Menestrels lavas are tholeiitic, The samples plot on the tholeiitic field at the stratigraphic section of Trois Menestrels, 80% of lavas from Mt. Tourmente are transitional to alkalic in the younger rocks (25.6 Ma). This sequence of tholeiitic to transitional to alkalic compositions is mirrored at Mt. Capitole and Mt. Marion Dufresne. Sr, Ba, Pb, Nb, Zr versus Nb plots show similar patterns across the Plateau Central and abundances overlap within error. Variations in isotopic composition reveal that Trois Menestrels is rather homogeneous compared to the other sections. A fundamental issue that derives from these results is the close relationship between these different rocks of the various region of the Plateau Central.
School:Kansas State University
School Location:USA - Kansas
Source Type:Master's Thesis
Keywords:kerguelen archipelago trois menestrels tholeiitic basalts hotspot indian ocean plume heterogeneity geochemistry 0996 geology 0372
Date of Publication:01/01/2008