摘要: Olivine leucitites from the Gaussberg volcano, Antarctica are primitive members of lamproite group ultrapotassic rocks. They glass rich, have an Mg number around 70, and carry spinel lherzolite xenoliths. Liquidus phase fields compositions were studied experimentally at atmospheric pressure with controlled oxygen fugacities. Chrome-spinels occur as inclusions in olivines natural rock, but it was necessary to add Cr2O3 experiments stabilize spinels liquidus, indicating that some fractionation has almost certainly occurred.
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