Abstract
Summary The Dunnage Mélange, part of back-arc basinal assemblages in north central Newfoundland, is host to a suite of dacitic to rhyolitic intrusions. Intrusion occurred during the late stages of mélange formation. Lobate, pillowed, corrugated and pahoehoe-like igneous contact surfaces, complex interlayering of host mudstone and dacite, and the occurrence of peperite, indicate that the magma intruded unconsolidated mud and the adjacent sediment was fluidized. This evidence for shallow emplacement of the magma is inconsistent with the existence of a tectonic overburden during mélange formation, and supports an olistostromal origin for the Dunnage Mélange.
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