Petrogenetic implications of uranium abundances in volcanic rocks from southern Peru

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Authors:Dupuy, C.; Dostal, J.; Capedri, S.; Lefevre, C.
Volume Title:Bulletin Volcanologique
Source:for the [Bulletin Volcanologique, 39(3), p.363-370. Publisher: Springer International] International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), Heidelberg, International. ISSN: 0366-483X
Publication Date:1976
Note:In English. 17 refs.; illus. incl. tables, geol. sketch map
Summary:With the Plioquaternary volcanic rocks of the S Peruvian Andes, two major suites are recognized: an andesitic suite in the west, closest to the Peru-Chile trench, and a shoshonitic suite to the east. There are significant differences in major- and trace- element chemistry between the two suites, and differences in Rb/U ratios are particularly noted. U content increases with SiO2 in all rocks, and within the andesitic suite U content also increases with distance from the trench. Models for the production of magmas of both suites from the same source invoke variable degrees of partial fusion of mantle material, and/or variable degrees of crustal contamination. Alternatively, the shoshonites and andesites may have had different sources. [R.J.S.]
Subjects:Actinides; Alkali metals; Analysis; Andesites; Basalts; Cenozoic; Chemical composition; Composition; Genesis; Geochemistry; Igneous rocks; Isotopes; Metals; Partial melting; Petrology; Rubidium; Shoshonite; Trace elements; Uranium; Volcanic rocks; Peru; South America; Abundance; Ratios; Rb/U; South; Volcanic
Coordinates:S181500 S090000 W0700000 W0811000
Abstract Numbers:82M/4373
Record ID:1977045736
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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