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Structural and Metamorphic Framework of the North D’Aguilar Block, Southeast Queensland


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Author Holcombe RJ, Little TA, Gibson GM, Sliwa R, Dobos SK


Current studies, and analysis of previously
published data, have lead to a re-evaluation of the
inclusion of the North D’Aguilar block within the
“Gympie Province” in southeast Queensland. The
metamorphic rocks are part of a Late Devonian(?)-
Early Carboniferous subduction accretionary complex
and are unconformably overlain by volcanic and
coarse-grained clastic rocks of probable Early or
mid-Permian age, as well as by Early to middle
Triassic rocks of the Esk Rift. Metamorphic fabrics
in the basement rocks include not only those that
can be related to convergence, but also younger
fabrics that may have developed during Late
Carboniferous or Permian uplift and unroofing of
the accretionary rocks. A predominance of basic
schists, some of which are blue amphibole-bearing,
and associated fine-grained pelagic and hemipelagic
sediments in the Northern D’Aguilar block contrast
with the siliciclastic-dominated sediments of most
of the accretionary complexes of the New England
Orogen. However the similarity of structural style,
and metamorphic and igneous history, with adjacent
basement blocks, and with other blocks throughout
the New England orogen, suggests that the North
D’Aguilar block simply represents deeper, probably
underplated, levels of the same subduction complex.
Uplift and cooling may have been accomplished by
extensional faulting during Permian inception of
the Esk rift, which flanks the block on the west.