Geology and trace-element geochemistry of the Umuna gold-silver deposit, Misima Island, Papua New Guinea

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doi: 10.1016/0375-6742(90)90039-D
Authors:Clarke, D. S.; Lewis, R. W.; Waldron, H. M.
Author Affiliations:Primary:
Univ. Auckland, Geol. Dep., Auckland, New Zealand
Other:
BHP-Utah Miner. Int., Australia
West. Min. Explor. S.A., Chile
Placer Pac., Australia
Becquerel Lab., Australia
Volume Title:Epithermal gold mineralization of the Circum-Pacific; geology, geochemistry, origin and exploration, I
Volume Authors:Hedenquist, J. W., editor; White, N. C.; Siddeley, G.
Source:Epithermal gold mineralization of the Circum-Pacific; geology, geochemistry, origin and exploration, I, edited by J. W. Hedenquist, N. C. White and G. Siddeley. Journal of Geochemical Exploration, 35(1-3), p.201-223. Publisher: Elsevier, Amsterdam-New York, International. ISSN: 0375-6742
Publication Date:1990
Note:In English. 24 refs.; illus. incl. 2 tables, sects., geol. sketch map
Summary:This deposit is hosted within a 100-300 m wide zone of fractures, veins, anastomosing shears, and breccia sheets recognized over a 3- km strike length. The host rocks are a metamorphosed Cretaceous- Palaeogene volcano-sedimentary sequence, extensively intruded by Neogene granodiorites. Vertical and lateral zonation is seen in the deposit. The geothermal system responsible for the mineralization is thought to have a lateral extent similar to that of the present E part of Misima island. Alteration mineralogy associated with mineralization is characterized by sericite- smectite adjacent to the main quartz veining, grading to chlorite- sericite laterally and chlorite-epidote at depth. A halo to the deposit is better distinguished, however, by anomalous Au and trace element rock geochemistry; distinctive geochemical responses are recognized up to a km from the mineralized structure. [R.E.S.]
Subjects:Breccia; Clastic rocks; Economic geology; Epithermal processes; Geochemical methods; Geochemistry; Gold ores; Haloes; Metal ores; Mineral assemblages; Mineral exploration; Mineralization; Sedimentary rocks; Silver ores; Trace elements; Veins; Zoning; Australasia; Papua New Guinea; Misima; Umuna Deposit
Abstract Numbers:90M/3990
Record ID:1990027256
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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