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Abstract

The late Mesozoic Marum and Papuan ophiolites of Papua New Guinea
dip from the continental margin towards accreted Paleogene island-arcs and
appear to represent frontal-arc basement emplaced as a result of mid-
Tertiary continent/arc collision. Both ophiolites comprise thick sequences
of layered ultramafic and mafic cumulates overlying tectonite peridotite
and have associated basaltic pillow lavas. The petrology and geochemistry
of the cumulate sequences are not consistent with an origin from common
mid-ocean ridge basalts (MORE). Discrimination between mid-ocean ridge or
marginal basin origins for the Papua New Guinea ophiolites is more dependent
on accurate dating of the rocks rather than geochemical characteristics.

Item Type:	Thesis - PhD
Authors/Creators:	Jaques, AL
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