The Bilimoia gold deposit, Kainantu, Papua New Guinea: A fault-controlled, lode-type, synorogenic tellurium-rich quartz-gold vein system View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2005

AUTHORS

Joseph O. Espi , Ken-ichiro Hayashi , Kosei Komuro , Yoshimichi Kajiwara , Hiroyasu Murakami

ABSTRACT

The Bilimoia gold deposit (1.77 Moz), Papua New Guinea (PNG), is a fault-hosted quartz-gold vein system hosted by 290–221 Ma years old basement that was regionally metamorphosed to greenschist facies at ∼45 Ma. Mineralisation occurred during S3-S4 ductile events in a S1-S4 deformation sequence, rapid uplift, crustal thickening and when the plate motions changed from oblique-transpressional to orthogonal convergence. It is spatially and temporally related to I-type, intermediate-felsic 9–7 Ma year-old porphyries. Distal quartz-specularite-calcite veins with chlorite-epidote selvage is the earliest hydrothermal event. Wallrock has been altered to quartz-illite-pyrite and quartz-sericite-mariposite/fuchsitepyrite, respectively. Infilling stages are divided into quartz±ferberite ±adularia, hematite, pyrite, quartz-sphalerite-galena-chalcopyrite, quartz-Cu±Sn sulphides-gold-tellurides-Te-Ag-Sb-Bi±Cu phases and carbonates-clays, respectively. Hypogene gold occurs as native gold, electrum, calaverite, kostovite, petzite and sylvanite; calaverite hosts 90–95% of the total gold. Gold distribution in the supergene zone (<200 m) primarily mirrors the primary mineralisation. Fluid inclusions from stage 4 quartz define low salinity (0.9–5.4 wt% NaCl) mixed aqueous-carbonic fluids at 210–330 °C. Inclusions that homogenised at 300–330 °C host coexisting liquid and vapour-rich (including CO2-bearing) phases, implicating phase separation. Ferberite was deposited from low salinity (0.9–1.1 wt% NaCl) mixed aqueous-carbonic fluids at 240–260 °C. Gold deposition occurred after phase separation due to decreasing temperature and sulphur activity, fluctuating pressure and change in the fluid oxidation state between 260 and 100 °C. Bisulphides and gold-telluride complexes transported gold. Bilimoia is similar to many gold deposits classified by many workers as epizonal orogenic and intrusion-related. Ore-forming fluids were derived from metamorphic devolatilisation at sites located above rising magma melts, crystallising intrusions associated with magma that was contaminated by reduced basement/subducted sediments, or a mixture of these sites. More... »

PAGES

941-944

References to SciGraph publications

Book

TITLE

Mineral Deposit Research: Meeting the Global Challenge

ISBN

978-3-540-27945-7
978-3-540-27946-4

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/3-540-27946-6_240

DOI

http://dx.doi.org/10.1007/3-540-27946-6_240

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1020010783


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