Lithium concentrations and isotope signatures of Palaeozoic basement rocks and Cenozoic volcanic rocks from the Central Andean arc and back-arc
| Autor: | Simone A Kasemann, Anette Meixner, Raúl Becchio, Friedrich Lucassen, Pablo Jorge Caffe, Jan M. Lindsay, Carisa Sarchi, Martin Rosner |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Metamorphic rock CENTRAL ANDES Geochemistry 010502 geochemistry & geophysics Geociencias multidisciplinaria 01 natural sciences PALAEOZOIC BASEMENT Ciencias de la Tierra y relacionadas con el Medio Ambiente Continental margin Geochemistry and Petrology CENOZOIC VOLCANIC ROCKS LITHIUM DEPOSITS 0105 earth and related environmental sciences geography geography.geographical_feature_category Plateau Volcanic rock Geophysics Basement (geology) Source rock Volcano LITHIUM ISOTOPES Economic Geology Sedimentary rock Geology CIENCIAS NATURALES Y EXACTAS |
| DOI: | 10.1007/s00126-019-00915-2.pdf |
| Popis: | We investigate the Li isotope composition and the Li concentrations of metamorphic and sedimentary rocks of the Palaeozoic (Pz) basement in the Central Andes and follow the trace of the Li in the Cenozoic volcanic rocks at the active continental margin. The average Li isotope composition of Pz-basement closely resembles global averages of upper crustal rocks with overlapping, but higher average Li content in the Pz-basement. Lithium isotope composition and content in the Cenozoic volcanic rocks of the Central Volcanic Zone (CVZ) range from mantle-like signatures to Pz-basement compositions with high δ7Li values and high Li contents. Evolutionary trends of the Li isotope composition in the CVZ volcanic rocks can be explained by assimilation of the Pz-basement. At a margin-wide scale, the abundance of Li in the CVZ volcanic rocks is higher than that of the Cenozoic volcanic rocks of the active Andean arc north and south of the CVZ. The CVZ volcanic and Pz-basement rocks are considered to be the primary source of Li in world-class Li-deposits in evaporates of the Altiplano-Puna high plateau and its western slope between ca 27° and 20° S. These deposits define the so-called “Lithium-Triangle”, between southern Bolivia, NW Argentina and NE Chile. The pivotal processes of extraction of Li from its primary rock sources and of Li migration from the source rocks to the deposits still await detailed investigation. Fil: Meixner, Anette. Universitat Bremen; Alemania Fil: Sarchi, Carisa. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentina Fil: Lucassen, Friedrich. Universitat Bremen; Alemania Fil: Becchio, Raul Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina Fil: Caffe, Pablo Jorge. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentina. Universidad Nacional de Jujuy; Argentina Fil: Lindsay, Jan Marie. University of Auckland; Nueva Zelanda Fil: Rosner, Martin. Isoanalysis Ug; Alemania Fil: Kasemann, Simone A.. Universitat Bremen; Alemania |
| Databáze: | OpenAIRE |
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