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- W2040132389 abstract "The lunar sample, 12009, is a rapidly quenched basalt with microphenocrysts of olivine (∼7%) and spinel in a cryptocrystalline matrix with many small microlites. The rock is olivine-normative (11%) and comparison of the olivine microphenocryst compositions with the experimentally determined liquidus olivine compositions shows that the rock was originally entirely liquid and that none of the observed olivine results from crystal accumulation. The magma (12009) began crystallizing olivine at ∼1230°C, spinel joined the olivine at ∼1210°C, and pigeonitic clinopyroxene would have appeared at ∼1190°C but sudden quenching of the magma occurred before this temperature was reached. Experimental studies at high pressure on 12009 magma show that olivine ceases to be a liquidus phase at pressures above 8kb and the liquidus clinopyroxene becomes more Ca and Al rich with increasing pressure. Although 12009 is not saturated with orthopyroxene at any pressure, a composition of 12009 + 10% olivine (Fo75) has olivine and orthopyroxene as liquidus phases at 15kb. The data are used to infer partial melting of olivine pyroxenite [orthopyroxene + clinopyroxene + olivine, 100 Mg/Mg + Fe = 75–80] at depths > 200 km within the lunar interior, as the primary source of the maria-filling magmas." @default.
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- W2040132389 date "1971-12-01" @default.
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- W2040132389 title "Experimental petrology of Apollo 12 basalts: part 1, sample 12009" @default.
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- W2040132389 doi "https://doi.org/10.1016/0012-821x(71)90109-9" @default.
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