Geochemistry of wallrock alteration, Rosebery, Tasmania, Australia

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doi: 10.1016/0883-2927(91)90004-9
Authors:Naschwitz, W.; van Moort, J. C.
Author Affiliations:Primary:
Univ. Tasmania, Geol. Dep., Hobart, Tasmania, Australia
Volume Title:Applied Geochemistry
Source:Applied Geochemistry, 6(3), p.267-278. Publisher: Pergamon, Oxford-New York-Beijing, International. ISSN: 0883-2927
Publication Date:1991
Note:In English. 27 refs.; illus. incl. 3 tables, sects., geol. sketch maps
Summary:The Rosebery Fe-Zn-Pb-Cu (-Ag-Au)-bearing ore deposit consists of two adjacent massive sulphide bodies hosted in a lens of sedimentary rocks within a pile of Cambrian and pyroclastic rocks. Both orebodies are underlain by zones of intense alteration marking the path of the metal-bearing fluids. The southern vent is exposed at the surface; its alteration zone extends for < than or = to 2 km and has a maximum width of approx 700 m. The alteration is marked by plagioclase-free quartz-sericite- (chlorite) schists which occur as siliceous augen schists or thinly cleaved K-feldspar-bearing schists. Samples can be grouped geochemically into altered and unaltered volcanic rocks despite the large variation in chemical composition within each group. Near the deposit, SiO2, K2O and Rb are anomalously high while contents of Al2O3, Na2O, TiO2, CaO, Sr, Zr, Y and Nb show a significant depletion; in the outer alteration halo the hydrothermal influence is more easily detected geochemically than geologically. [R.A.H.]
Subjects:Copper ores; Gold ores; Hydrothermal alteration; Iron ores; Lead ores; Massive deposits; Metal ores; Metasomatism; Petrology; Processes; Silver ores; Sulfides; Wall-rock alteration; Zinc ores; Australasia; Australia; Rosebery Australia; Tasmania Australia
Abstract Numbers:92M/0576
Record ID:1991047179
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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