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Plutonic boninite-like rocks in an anatectic setting; tectonic implications for the Delamerian Orogen in southeastern Australia

A. I. S. Kemp
Plutonic boninite-like rocks in an anatectic setting; tectonic implications for the Delamerian Orogen in southeastern Australia
Geology (Boulder) (April 2003) 31 (4): 371-374

Abstract

High-Mg, low-Ti diorites in the Cambrian--Ordovician Glenelg River Complex (southeastern Australia) have compositional affinities with the boninitic lavas erupted in intraoceanic arcs, but occur in an anatectic environment mingled with crustal melts. Boninitic rocks have not previously been recorded from such a setting. Field and petrologic evidence suggests that the parental boninitic liquids are approximated by hornblende diorites, crystallization from which yielded complementary cumulates and evolved tonalitic derivatives. The presence of these rocks, and associated arc-like intrusions, compromises collisional tectonic models for the Glenelg River Complex and instead implies early development of the terrane above a subduction zone. Boninitic magmas were subsequently trapped at deep crustal levels during convergent orogenesis.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 31
Serial Issue: 4
Title: Plutonic boninite-like rocks in an anatectic setting; tectonic implications for the Delamerian Orogen in southeastern Australia
Author(s): Kemp, A. I. S.
Affiliation: Australian National University, Department of Geology, Canberra, Australia
Pages: 371-374
Published: 200304
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 2003-032338
Categories: Igneous and metamorphic petrologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2003045
Illustration Description: illus. incl. geol. sketch map
S37°30'00" - S37°04'60", E141°04'60" - E141°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200311
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