The Orange River Group; a major Proterozoic calcalkaline volcanic belt in the western Namaqua Province, Southern Africa

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Authors:Reid, D. L.; Welke, H. J..; Erlank, A. J.; Moyes, A.
Author Affiliations:Primary:
Univ. Cape Town, Dep. Geochem., Rondebosch, South Africa
Oxford Polytech., United Kingdom
Univ. Coll. Cardiff, United Kingdom
Univ. Witwatersrand, South Africa
Volume Title:Geochemistry and mineralization of Proterozoic volcanic suites
Volume Authors:Pharaoh, Tim C., editor; Beckinsale, Robert D.; Rickard, David Terence
Source:Geological Society Special Publications, Vol.33, p.327-346; Geochemistry and mineralization of Proterozoic volcanic suites, Keyworth, United Kingdom, Apr. 1986, edited by Tim C. Pharaoh, Robert D. Beckinsale and David Terence Rickard. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719
Publication Date:1987
Note:In English. 34 refs.; illus. incl. 4 tables, geol. sketch maps
Summary:Volcanic activity during deposition of the Orange River group was predominantly subaerial, and involved the eruption of an andesite-dominated calc-alkaline suite ranging from basalt through to rhyolite. The suite may represent the remnants of a 2000 m.y. old Proterozoic arc complex. The high K character, the intimate association of comagmatic granitic rocks, the development of copper porphyries, and the lack of any direct or indirect evidence for underlying Archaean crust all point to a mature island arc environment. [J.M.H.]
Subjects:Alkaline earth metals; Andesites; Basalts; Calc-alkalic composition; Chemical composition; Geochemistry; IGCP; Igneous rocks; Isotopes; Lava; Lead; Metals; Nd-144/Nd-143; Neodymium; Pb/Pb; Pb/Th; Precambrian; Proterozoic; Rare earths; Rb/Sr; Sm/Nd; Sr-87/Sr-86; Stable isotopes; Strontium; Tholeiite; Trace elements; Upper Precambrian; Volcanic rocks; Africa; Namaqualand; Southern Africa; Orange River Group; Ratios
Abstract Numbers:89M/1855
Record ID:1988045735
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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