|The Sin Quyen Iron Oxide-Copper-Gold-Rare Earth Oxide Mineralisation of North Vietnam|
Robert N. McLean, AQ Geological Consultants
in - Porter, T.M. (Ed), 2002 - Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, PGC Publishing, Adelaide, v. 2, pp 293-301.
The Sin Quyen deposit in northern Vietnam is an unusual example of the Fe oxide-Cu-Au-REE group of deposits. Magnetite-orthite-chalcopyrite-gold mineralisation is hosted by extremely altered amphibolite and biotite-gneiss lenses within highly deformed and metamorphosed sediments of the Proterozoic Sin Quyen Formation. The deposit formed in a wide fault zone which acted as a channel for pre-mineralisation amphibolite and granitic dykes, mineralising fluids as well as post mineralisation granite, pegmatite and amphibolite. Metasomatic alteration produced a variety of assemblages predominantly composed of variable amounts of quartz, hastingsite and biotite but also including small zones of hedenbergite-garnet skarn. Alteration is closely associated with magnetite and orthite (allanite) development. Sulphide mineralisation, mainly chalcopyrite and pyrrhotite with lesser pyrite is a later and lower temperature hydrothermal event, although the majority of the sulphides were deposited within the alteration zones.
This book is NOW AVAILABLE FOR ORDER via the web by selecting the BUY button above.
This abstract was printed from the PGC Publishing website http://www.portergeo.com.au/publishing.