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A Dry Origin of 4-Vesta Estimated by the Water Content in Pyroxenes from the HED

The HED meteorites provide a uniquely detailed record of differentiation processes that occurred on the early-formed basaltic 4-Vesta asteroid. We used pyroxenes from eucrites (Juvinas, Serra de Magè, Stannern), howardite (Luotolax, Kapoeta) and one diogenite (Shalka) as proxy to estimate the water content of 4-Vesta. Pigeonite and orthopyroxene were extracted from the HED meteorites and measured by FTIR spectroscopy in the region 6000-2000 cm- 1 . The integrated area of OH bands is used to estimate the water content of pyroxene and then to calculate the primitive magma water content. However, no specific opx OH bands could be observed. H the