Sr and Nd isotope composition of the metamorphic,sedimentary and ultramafic xenoliths of Lanzarote (Canary Islands): Implications for magma sources |
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| Authors: | Alfredo Aparicio Colombo CG Tassinari Roberto García Vicente Araña |
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| Institution: | 1. Institute of Volcanology and Seismology FEB RAS, Piip boulevard 9, Petropavlovsk-Kamchatsky 683006, Russian Federation;2. GZG, Abteilung Geochemie, Universität Göttingen, Goldschmidtstrasse 1, 37077 Göttingen, Germany;3. Department of Earth Sciences, Dickinson College, Carlisle, PA 17013, United States of America;4. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Staromonetnyi pereulok 35, Moscow 119017, Russian Federation;1. KiDs (Kimberlites and Diamonds), School of Earth Sciences, The University of Melbourne, Parkville, 3010, Victoria, Australia;2. ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, North Ryde, 2019, NSW, Australia;3. Department of Earth Sciences, VU Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;4. School of Physical Sciences, University of Tasmania, Hobart, 7001, Tasmania, Australia;5. Melbourne Isotope Geochemistry, School of Earth Sciences, The University of Melbourne, Parkville, 3010, Victoria, Australia;6. Central Science Laboratory, University of Tasmania, Hobart, 7001, Tasmania, Australia;7. School of Geography, The University of Melbourne, Parkville, 3010, Victoria, Australia;1. CRPG, UMR 7358, CNRS, Université de Lorraine, Vand?uvre-lès-Nancy, France;2. Clermont Université, Université Blaise Pascal, CNRS, UMR 6524, IRD, R 163, Laboratoire Magmas et Volcans, Clermont-Ferrand, France;1. Instituto Geográfico Nacional, Centro Geofísico de Canarias, C/La Marina 20, 2°, 38001 Santa Cruz de Tenerife, Spain;2. Instituto Geográfico Nacional, Observatorio Geofísico Central, C/Alfonso XII, 3, 28014 Madrid, Spain;1. Antarctica National Museum, University of Siena, Via Laterina 8, 53100, Siena, Italy;2. Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza 4, 20126, Milano, Italy;3. Earth Sciences Department, University of Milano, Via Mangiagalli 34, 20133, Milano, Italy;4. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Sismologia e Tettonofisica, Via di Vigna Murata 605, 00143, Roma, Italy |
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| Abstract: | The lavas produced by the Timanfaya eruption of 1730–1736 (Lanzarote, Canary Islands) contain a great many sedimentary and metamorphic (metasedimentary), and mafic and ultramafic plutonic xenoliths. Among the metamorphosed carbonate rocks (calc-silicate rocks CSRs]) are monomineral rocks with forsterite or wollastonite, as well as rocks containing olivine ± orthopyroxene ± clinopyroxene ± plagioclase; their mineralogical compositions are identical to those of the mafic (gabbros) and ultramafic (dunite, wherlite and lherzolite) xenoliths. The 87Sr/86Sr (around 0.703) and 143Nd/144Nd (around 0.512) isotope ratios of the ultramafic and metasedimentary xenoliths are similar, while the 147Sm/144Nd ratios show crustal values (0.13–0.16) in the ultramafic xenoliths and mantle values (0.18–0.25) in some CSRs. The apparent isotopic anomaly of the metamorphic xenoliths can be explained in terms of the heat source (basaltic intrusion) inducing strong isotopic exchange (87Sr/86Sr and 143Nd/144Nd) between metasedimentary and basaltic rocks. Petrofabric analysis also showed a possible relationship between the ultramafic and metamorphic xenoliths. |
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