LARGE IGNEOUS PROVINCES:
KERGUELEN PLATEAU & BROKEN RIDGE

Participation in the Ocean Drilling Program Leg 183 to the Kerguelen Plateau and Broken Ridge (Indian Ocean) has resulted in a large number of basalt samples from this LIP.  Eight sites were drilled, 6 on the plateau proper and two on Broken Ridge.  All but one reached basaltic basement.  What is immediately apparent is the alkalic nature of the waning stages of plateau volcanism, especially at Site 1139 on the Kerguelen Plateau and at Site 1141 on Broken Ridge.  Evidence of a continental component in the basalts is seen in the geochemistry of the basalts from Sites 1137 and 1142. 

Papers resulting from this work:

Chazey W.J. III and Neal C.R. (2004) The role of mineral-melt fractionation on the highly siderophile element abundances in Kerguelen Plateau basalts and a possible plume origin at the core-mantle boundary. Geochim. Cosmochim. Acta (under review).

Neal C.R., Mahoney J.J., and Chazey W.J., IIII (2002) Mantle sources and the highly variable role of continental lithosphere in basalt petrogenesis of the Kerguelen Plateau and Broken Ridge LIP: Results from Ocean Drilling Program Leg 183. J. Petrology 43, 1177-1205.

Frey F.A., Coffin M.F., Wallace P.J., Weis D., Zhao X., Wise S.E., Wähnert V., Teagle D.A.H., Saccocia P.J., Reusch D.N., Pringle M.S., Nicolaysen K.E., Neal C.R., Müller R.D., Moore C.L., Mahoney J.J., Keszthelyi L., Inokuchi H., Duncan R.A., Delius H., Damuth J.E., Damasceno D., Coxall H.K., Borre M.K., Boehm F., Barling J., Arndt N., and Antretter M. (2000) Origin and evolution of a submarine large igneous province: The Kerguelen Plateau and Broken Ridge, Southern Indian Ocean. Earth Planet. Sci. Lett. 176, 73-89.

Mahoney J.J., White W.M., Upton B.J.G., Neal C.R., and Scrutton R.A. (1996) Beyond EM-1: Lavas from Afanasy-Nikitin Rise and the Crozet Archipelago, Indian Ocean. Geology 24, 615-618.

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