High pressure crystallization of the Ewarara,Kalka and Gosse Pile intrusions,Giles Complex,central Australia |
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| Authors: | A D T Goode A C Moore |
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| Institution: | (1) Department of Geology and Mineralogy, University of Adelaide, South Australia, Australia;(2) Present address: BHP Melbourne Research Laboratories, Wellington Road, 3168 Clayton, Victoria, Australia;(3) Present address: Department of Geology, University of Cape Town, Rondebosch, South Africa |
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| Abstract: | Evidence is presented for the primary high pressure crystallization of the Ewarara, Kalka and Gosse Pile layered intrusions which form part of the Giles Complex in central Australia. These pressures are estimated at 10 to 12 kb. The high pressure characteristics include subsolidus reactions between olivine and plagioclase, orthopyroxene and plagioclase, and orthopyroxene and spinel; spinel and rutile exsolution in both ortho- and clino-pyroxene; spinel exsolution in plagioclase; high Al2O3 and Cr2O3 contents of both ortho- and clinopyroxene; high AlVI in clinopyroxene; dominance of orthopyroxene as an early crystallizing phase; high distribution coefficients for co-existing pyroxene pairs; and thin chilled margins. Such phenomena are rare in documented layered basic intrusions. |
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