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

Blenkinsop, Thomas, Tripp, Gerard and Gillen, Dave 2017. The relationship between mineralization and tectonics at the Kainantu gold-copper deposit, Papua New Guinea. Geological Society, London, Special Publications , 453. 10.1144/SP453.11

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Geological Society of London
ISSN: 0305-8719
Date of First Compliant Deposit: 3 November 2017
Date of Acceptance: 26 October 2017
Last Modified: 27 Oct 2018 00:57

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