Skip to Main Content
Book Chapter

The relationship between mineralization and tectonics at the Kainantu gold–copper deposit, Papua New Guinea

By
Tom Blenkinsop
Tom Blenkinsop
School of Earth and Ocean Science, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
Search for other works by this author on:
Gerard Tripp
Gerard Tripp
Consulting Geologist Pty Ltd, PO Box 42, Woodvale, Western Australia, 6026, Australia
Search for other works by this author on:
Dave Gillen
Dave Gillen
School of Earth and Environmental Science, James Cook University, Townsville QLD4811, Australia
Search for other works by this author on:
Published:
January 01, 2018

Abstract

Epithermal veins and breccias at the Kainantu gold–copper deposit in Papua New Guinea, host gold mineralization in NW–SE steeply dipping lodes. The lodes are parallel to a pre-mineralization dextral strike-slip shear-zone network, which is itself parallel in places to an early greenschist-facies cleavage in basement schists. The cleavage, shear zone and veins are all cut by dextral strike-slip faults. High Au grades correlate with areas of obliquity between the shear-zone fabrics and the cleavage, and plunge at approximately 40° SE in the plane of the lodes – coincident with minor fold axes related to a crenulation cleavage in the basement rocks. This clear structural history shows that gold mineralization was confined to a particular late structural event, but lode geometry was influenced by all previous structures, as well as being displaced by post-mineralization faulting. The north–south shortening recorded through most of the tectonic history can be related to Tertiary convergence along the major plate boundary located approximately 15 km north of the mine. However, mineralization occurred under a different tectonic regime from the current north–south convergence, when there was a change of tectonics between 9 and 6 Ma, possibly related to delamination.

You do not currently have access to this article.

Figures & Tables

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
Search for other works by this author on:
T.G. Blenkinsop
T.G. Blenkinsop
Cardiff University, UK
Search for other works by this author on:
P. Sorjonen-Ward
P. Sorjonen-Ward
Geological Survey of Finland, Finland
Search for other works by this author on:
Geological Society of London
Volume
453
ISBN electronic:
9781786203342
Publication date:
January 01, 2018

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal