Regional Geochemical Variations of Upper Cenozoic Volcanic Rocks in the Andes
dc.contributor.author | Palma, Vincent V. | |
dc.date.accessioned | 2023-02-08T15:21:01Z | |
dc.date.available | 2023-02-08T15:21:01Z | |
dc.date.issued | 1978-03-15 | |
dc.description.abstract | Regional variations in the chemical composition of Miocene-to-Recent volcanic rocks from the Central Andes are investigated on the basis of 260 chemical analyses compiled from the literature in addition to 25 new analyses for 5 trace elements. Correlations are established between major and trace element compositions and other variables such as distance from the eruptive centres from the Peru-Chile trench or crustal thickness, using the computer and multigraphic techniques. Among the most striking correlations are the confirmation of the previously established continent-ward increase of K2O for all rock types, a surprising negative correlation of Na2O with distance from the trench in one large segment of the Cordillera and the positive correlation of Li, U and Rb with crustal thickness. Comparisons are also made between Andean rocks and those of island arcs and other tectonic regimes. Keywords: Pages: Supervisor: Marcos Zentilli | en_US |
dc.identifier.uri | http://hdl.handle.net/10222/82293 | |
dc.title | Regional Geochemical Variations of Upper Cenozoic Volcanic Rocks in the Andes | en_US |
dc.type | Report | en_US |