Petrology and Petrogenesis of Cumulate Peridotites and Gabbros from the Marum Ophiolite Complex, Northern Papua New Guinea

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Abstract
The Marum ophiolite complex in northern Papua New Guinea includes a thick (3–4 km) sequence of ultramafic and mafic cumulates, which are layered on a gross scale from dunite at the base upwards through wehrlite, lherzolite, plagioclase lherzolite, pyroxenite, olivine norite-gabbro and norite-gabbro to anorthositic gabbro and ferrogabbro at the top. Igneous layering and structures, and cumulus textures indicate an origin by magmatic crystallization in a large magma chamber(s) from magma(s) of evolving composition. Most rocks however show textural and mineralogical evidence of subsolidus re-equilibration.

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