Leg 09 Leg 10 David M. Christie, Oregon State University Fremantle-Hobart 28 Jan-12 Mar 1995 The two principal tasks of this leg are to collect more detailed bathymetry, gravity and magnetics data from one or more small, special interest regions within the study area of as identified from data collected during Leg 09 and to collect a representative set of volcanic rock samples from the Southeast Indian Ridge between 42oS 88oE and 50oS 140oE. Samples will be spaced approximately every 50 km along the ridge, with more detailed sampling within the areas selected for detailed geophysical mapping. The objective of this, and the previous leg is to understand the changes that occur in the Southeast Indian Ridge as it passes from the hot mantle region associated with the Kerguelen and Amsterdam volcanic hot spots, to the cold mantle region beneath the Australian-Antarctic Discordance near 130o161oE. Of particular interest, are variations in the structure, topography and geophysical characteristics of the ridge, in its associated volcanic processes in the chemical compositions of erupted lavas, and, by inference, in the composition and structure of the underlying mantle.

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