Comparison between magmatic activity and gold mineralization at Conical Seamount and Lihir Island, Papua New Guinea

Müller, D. and Franz, L. and Petersen, S. and Herzig, P. M. and Hannington, M. D.. (2003) Comparison between magmatic activity and gold mineralization at Conical Seamount and Lihir Island, Papua New Guinea. Mineralogy and petrology, 79 (3-4). pp. 259-283.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/81524/

Downloads: Statistics Overview


Grab samples from the submarine Conical Seamount, located about 10 km south of the giant Ladolam gold deposit, Lihir Island, reveal the highest gold concentrations yet reported from the modern seafloor. Lavas from Conical Seamount are characterized by high K2O contents, high K2O/Na2O ratios, and high Ce/Yb ratios, which are typical of high-K igneous rocks from oceanic (island) arc-settings. The primitive character of the rocks from Conical Seamount implies a magmatic evolution related to a single eruptive phase, which contrasts with the more evolved rocks forming Lihir Island. Geochemical as well as mineral chemical data suggest that the melts from both Conical Seamount and Lihir Island originate from the same magma source. In common with the samples from Lihir Island, elevated oxygen fugacities of 0.7-2.5 log units above the FMQ buffer are recorded from the Conical Seamount lavas. There are distinct differences between the mineralization styles at Conical Seamount and at the Ladolam gold deposit, Lihir Island. While early-stage pyritic stockwork mineralization at Conical Seamount is hosted by clay-silica altered basaltic rocks with local alunite+/-kaolinite alteration, main-stage Au-mineralization occurs in sericite-alkali feldspar altered polymetallic sulfide-bearing siliceous veins. By contrast, early-stage pyritic stockwork mineralization at Ladolam is restricted to biotite-magnetite +/- silica-altered monzodiorite, while the main-stage bulk-tonnage mineralization occurs as auriferous pyrite-bearing hydrothermal breccias which, in places, are cut by quartz-chalcedony-illite-adularia-pyrite+/-marcasite veins containing isolated bonanza gold grades.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Theoretische Petrologie (De Capitani)
UniBasel Contributors:Franz, Leander
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:13 Apr 2021 08:37
Deposited On:13 Apr 2021 08:37

Repository Staff Only: item control page