Abstract

Australian Bureau of Mineral Resources (BMR) deep crustal seismic reflection profiling in the New England orogen of eastern Australia has revealed a thick, deeply buried, layered sequence that was telescoped by thrusting into a stack 20 km thick. The seismic character suggests that the sequence is probably sedimentary and comparable in style to that revealed by the Consortium for Continental Reflection Profiling (COCORP) beneath the Menimack synclinorium in New Hampshire. The Beenleigh terrene, a metamorphosed Paleozoic accretionary wedge that overlies the deep, layered sequence is thin skinned and has a maximum thickness of about 4.6 km. The boundary between the sequence and the New England orogen is a well-defined west-dipping thrust fault, which extends to at least 14 km. We suggest that telescoping of the deep, layered sequence occurred away from the New England orogen and that it and the Beenleigh terrene were later accreted to the orogcn by underthrusting, between 265 and 235 Ma.

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