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The Windimurra Igneous Complex: an Archean Bushveld?

By
Timothy J. Ivanic
Timothy J. Ivanic
Department of Mines and Petroleum, Geological Survey of Western Australia, East Perth, WA 6004, AustraliaAlso at: School of Geosciences, University of Sydney, Sydney, NSW, 2006, Australia
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Oliver Nebel
Oliver Nebel
School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia
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John Brett
John Brett
Department of Mines and Petroleum, Geological Survey of Western Australia, East Perth, WA 6004, Australia
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Ruth E. Murdie
Ruth E. Murdie
Department of Mines and Petroleum, Geological Survey of Western Australia, East Perth, WA 6004, Australia
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Published:
January 01, 2018

Abstract

The Archean Windimurra Igneous Complex consists of distinct components, including a thick layered series, with a cumulate mineral stratigraphy similar to the zones identified in the well-studied Bushveld Complex, South Africa. The complex is part of the plume-related and laterally extensive 2.81 Ga Meeline Suite, the intrusive component of a large igneous province. It is an anhydrous tholeiitic suite consisting of five layered mafic–ultramafic intrusions 25–85 km in the long dimension. These intrusions host significant V–Ti mineralization in their fractionated, Fe-rich upper zones. Recent mapping, combined with aeromagnetic, gravity and seismic surveys, has provided unparalleled three-dimensional constraints on the largest of these intrusions. The results of three-dimensional modelling show that it is thicker than previously recognized. At c. 11 km, it is the thickest layered mafic–ultramafic intrusion identified globally and one of the largest such intrusions volumetrically. The mineral zone stratigraphy and many other features associated with this complex share similarities with the c. 800 myr younger Bushveld Complex. On a large scale, three discordant units are delineated geometrically, providing fundamental constraints on a multi-stage genetic model for magma emplacement. The indication of a thick, subsurface Ultramafic Zone provides a potential target for Ni–Cr–platinum group element mineralization.

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Contents

Geological Society, London, Special Publications

Characterization of Ore-Forming Systems from Geological, Geochemical and Geophysical Studies

K. Gessner
K. Gessner
Geological Survey of Western Australia, Australia
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T.G. Blenkinsop
T.G. Blenkinsop
Cardiff University, UK
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P. Sorjonen-Ward
P. Sorjonen-Ward
Geological Survey of Finland, Finland
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Geological Society of London
Volume
453
ISBN electronic:
9781786203342
Publication date:
January 01, 2018

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