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Relationships between eclogites and certain megacrysts from the Jagersfontein kimberlite, South Africa |
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| Authors: | JB Dawson JV Smith |
| Institution: | 1 Department of Geology, University of Sheffield, Sheffield S1 3JD, Great Britain 2 Department of the Geophysical Sciences, University of Chicago, 5734 S. Ellis Avenue, Chicago, IL 60673, U.S.A. |
| Abstract: | Some garnet and omphacite megacrysts which are compositionally similar to phases in the eclogite xenoliths from the Jagersfontein kimberlite are ascribed to fragmentation of coarse-grained eclogites. They differ compositionally from other megacrysts from Jagersfontein and those found at other localities that are believed to be high-pressure phenocrysts precipitating from kimberlite. The eclogite suite differs from those in other southern African kimberlites, mainly in lacking eclogites containing Ca-rich garnets. |
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