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Diastrophic evolution of Western Papua and New Guinea.


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Smith, Jan Gerald 1964 , 'Diastrophic evolution of Western Papua and New Guinea.', PhD thesis, University of Tasmania.

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There are four main phases in the diastrophic
evolution of western Papua and New Guinea: (1) a Mesozoic
phase of taphrogen6sis (geosyncline formation) characterized
by the fragmentation of a pre-Mesozoic cratonic
platform into a series of intrageosynclinal troughs and
geanticlines which constituted the Papuan geosynclinal
system. This phase was accompanied by basic volcanism
and ultrabasic plutonism, (2) A Paleogene phase defined by the temporary stabilization of the geosynclinal system
and the development of an extensive quasi-platform regime.
(3) A lower and Middle Miocene phase of retrogressive
taphrogeneds marked by remobilization of the earlier geosynclinal
terrain and again by important volcanism. (4)
An Upper Miocene to Recent orogenic phase dominated by the
uplift of the Papuan geosynclinal system to form the New Guinea cordillera. Uplift was associated with the formation
of an exogeosynclinal trough, foreland folding and
andesitic volcanism.
The Papuan geosynclinal system is thought to have
formed primarily as the result of extensional stresses
within the earth's crust, although there is strong evidence
that-simple shear, translation and rotation have also
contributed to the total deformation of the orogen. These
fundamental horizontal movements have served as a framework
for the intense vertical oscillations that characterized
the development of the Papuan geosyncline and the
adjacent platform. The vertical movements culminated in the uplift of the New Guinea cordillera and the formation of two distinct patterns of folding and faulting. The
first type of folding is of a secular nature and is
intimately linked with the uplift of the orogen. These
primary folds are represented by the large horst-like
anticlinoria which form the backbone of the main cordillera.
The second type of folding is episodic in nature
and is the secondary consequence of orogenic uplift.
These are the foreland folded structures of the Papuan
foothills which originated as the result of gravity sliding
off the flank of the rising orogen.

Item Type: Thesis - PhD
Authors/Creators:Smith, Jan Gerald
Keywords: Geology, Geology
Copyright Holders: The Author
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Copyright 1964 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D.) - University of Tasmania, 1965. Includes bibliography

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