Geology and geochemistry of the Ojos del Salado volcanic region, Chile

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doi: 10.1144/gsjgs.144.1.0085
Authors:Baker, P. E.; Gonzalez-Ferran, O.; Rex, D. C.
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 144(1), p.85-96. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1987
Note:In English. 29 refs.; illus. incl. 3 tables, geol. sketch map
Summary:Miocene to Recent calc-alkaline volcanic rocks occur at the S end of the Central Volcanic Zone coinciding with a major morphological, seismic and volcanic discontinuity. It was previously suggested that the lineament might represent a continental extension of the 'Easter Hot Line'. There are five K/Ar date groups, the first three of which young to the E and show increasing K2O but no systematic compositional change. Wheelwright and other calderas date from 8-6 m.y.; the Group 4 volcanoes were constructed in the Pliocene and trend N 65°E, and as clockwise rotation of the volcanic axis continued, the Group 5 volcanoes of Ojos del Salado erupted in the Pleistocene - Recent showing a shift to more acidic compositions. The Ojos del Salado region seems to show no compositional link with the Pacific 'hot line' when trace elements, REE patterns and 86Sr/87Sr are considered. [R.E.S.]
Subjects:Alkaline earth metals; Cenozoic; Geochemistry; Igneous rocks; Isotopes; Metals; Rare earths; Sr-87/Sr-86; Stable isotopes; Strontium; Trace elements; Volcanic rocks; Volcanoes; Volcanology; Chile; South America; Central volcanic zone; Easter hot line; Northern Chile; Ojos del Salado
Abstract Numbers:87M/5015
Record ID:1987058708
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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