Mineral potential of the Rincón del Tigre Igneous Complex; a major upper Proterozoic layered intrusion in the shield of eastern Bolivia

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Authors:Annells, R. N.; Fletcher, C. J. N.; Styles, M. T.; Appleton, J. D.; Burton, C. C. J.; Evans, R. B.; Harding, R. R.
Author Affiliations:Primary:
Br. Geol. Surv., Nottingham, United Kingdom
Other:
Bryn Eithyn Hall, United Kingdom
Br. Mus. Nat. Hist., United Kingdom
Volume Title:Metallogeny of basic and ultrabasic rocks
Volume Authors:Gallagher, M. J., editor; Ixer, R. A.; Neary, C. R.; Prichard, H. M.
Source:p.487-498; Metallogeny of basic and ultrabasic rocks, Edinburgh, United Kingdom, Apr. 9-12, 1985, edited by M. J. Gallagher, R. A. Ixer, C. R. Neary and H. M. Prichard. Publisher: Inst. Min. and Metall., London, United Kingdom
Publication Date:1986
Note:In English. 39 refs.; illus. incl. geol. sketch maps
Summary:The Rincon del Tigre igneous complex is a large layered ultramafic-mafic laccolith which was intruded into Middle Proterozoic supracrustal rocks of the E Bolivian Precambrian Shield near the close of the Sunsas orogeny (approx 1000 m.y.). A total area of 720 km2 of igneous rocks is now exposed. The basal ultramafic unit (= or <3000 m) of rhythmically layered olivine and orthopyroxene cumulates is overlain by a median mafic unit (= or <1500 m) of cumulate gabbros floored by a norite layer. The complex is roofed by a 700 m felsic unit of acid granophyre which grades into the arkosic envelope rocks. Chromite is a common accessory mineral within the ultramafic unit but no chromitite bands have been found to-date. Geochemical and geophysical surveys have shown mafic-unit, magnetite-bearing gabbros to be hosts to late-precipitated copper sulphides, but no iron or nickel sulphides have been detected. Secondary nickel silicate mineralization is present in the Tertiary lateritic weathered zone over serpentinized dunites of the ultramafic unit. [J.M.H.]
Subjects:Chromite ores; Copper ores; Economic geology; Geochemical methods; Geophysical surveys; Igneous rocks; Intrusions; Iron ores; Laccoliths; Layered intrusions; Mafic composition; Metal ores; Methods; Mineral exploration; Neoproterozoic; Nickel ores; Platinum ores; Plutonic rocks; Precambrian; Proterozoic; Surveys; Ultramafics; Upper Precambrian; Bolivia; South America; Eastern Bolivia; Rincon del Tigre Igneous Complex
Abstract Numbers:87M/2338
Record ID:1987013902
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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