Our newly obtained data on the He-Ar and Sr-Nd isotopic systematics of mantle xenolith and their host basalts suggest the absence of a mantle plume beneath Lanzerote Island. The R/Ra ratio of the xenoliths lies within the range typical of MORB. The He isotopic composition of basalts from Lanzerote Island provides evidence of the mixing of two sources: MORB and atmospheric. The He isotopic ratios of both the xenoliths and the basalts do not show any correlations with the Sr and Nd isotopic characteristics.
Lanzerote Island, mantle xenoliths, basalts, He-Ar and Sr-Nd isotopes
1. Arana, The Canary Islands: Tectonics, Magamatism and Geodynamic Framework, Magmatism in Extensional Structure Settings, 1991.
2. Carracedo, Hotspot volcanism close to a passive continental margin: the Canary islands, Geol. Mag., v. 135, 1998., doi:https://doi.org/10.1017/S0016756898001447
3. Carracedo, Cenozoic Volcanism II, The Canary Islands, The Geology of Spain, 2002.
4. Chauvel, HIMU-EM: The French Polynesian connection, Earth Planet. Sci. Lett., 1992., doi:https://doi.org/10.1016/0012-821X9290042-T
5. Day, Origin of $^3$He/$^4$He ratios in HIMU-type basalts constrained from Canary Island lavas, Earth Planet. Sci. Lett., 2011., doi:https://doi.org/10.1016/j.epsl.2011.03.006
6. Dunai, Long-term cosmogenic $^3$He production rates 152 ka-1.35 Ma from 40Ar/36Ar dated basalt flows at 29deg. N latitude, Earth Planet. Sci. Lett., 2000., doi:https://doi.org/10.1016/S0012-821X9900308-8
7. Grachev, Mantle metasomatism in ultramafic xenoliths from basalts, Geochemistry of magmatic rocks, Abstracts, 2000.
8. Grachev, New data of mantle helium in basalts of the Tenerife island, Alkaline magmatism of the Earth, Abstracts, 2001a.
9. Grachev, The Canary Islands: Hotspot or mantle plume? 1. La Palma Island, Physics Solid Earth, 2001b.
10. Grachev, The geodynamics of volcanism in the Canary Islands in the light of the new petrographic and isotopic data, Int. Geol. Rev, v. 34, no. 10, 1992.
11. Grachev, State and composition of the upper mantle beneath the Canary Islands, 1994.
12. Hilton, Helium isotope ratios in mafic phenocrysts and geothermal fluids from La Palma, the Canary Islands Spain: Implications for the HIMU mantle sources, Geochim. Cosmochim. Acta, 2000., doi:https://doi.org/10.1016/S0016-70370000358-6
13. Ikorsky, Crushung of rocks and minerals in glass ampullae under the noble gases isotope study, Isotope geochemistry, 15 Symposium, Abstracts, 1998.
14. Jackson, Xenoliths in the Honolulu volcanic series, Hawaii, J. Petrol., v. 11, 1970.
15. Kamensky, Juvenile helium in ancient rocks: 3He excess in amphibolites from 2.8 Ga charnokite series -- crust mantle fluid in intracrustal magmatic processes, Geochim. Cosmochim. Acta, 1990., doi:https://doi.org/10.1016/0016-70379090127-7
16. Kaneoka, Noble gas constraints on the layered structure of the mantle, Nature, 1983., doi:https://doi.org/10.1038/302698a0
17. Kaneoka, Rare gas isotopes in Hawaiian ultramafic nodules and volcanic rocks: constraint on genetic relationships, Science, v. 20, 1980.
18. Keshav, Garnet-bearing xenoliths from Salt Lake crater, Oahu, Hawaii: high-pressure fractional crystallization in the oceanic mantle, J. Petrol., 2007., doi:https://doi.org/10.1093/petrology/egm035
19. Koreshkova, Petrology of mantle xenoliths in alkaline basalts of the Lanzerote, 1994.
20. Lokhov, Carbon and primary helium and argon isotopes in mantle rocks: geochemical and cosmochemical consequences, Geochemistry, v. 9, 1993.
21. Neumann, Petrogenesis of spinel harzburgite and dunite suite xenoliths from Lanzarote, eastern Canary islands: implications for the upper mantle, Lithos, 1995., doi:https://doi.org/10.1016/0024-49379591153-Z
22. Ovchinnikova, Sr-Nd-Pb isotopes of mantle sources of basalts from the Canary Islands, Petrologiya, v. 3, 1995.
23. Richard, $^143$Nd/$^144$Nd a antural tracer. An application to oceanic basalts, Earth Planet. Sci. Lett., v. 31, 1976.
24. Romero, Los volcanes, 1986.
25. Sagredo, Origen de la inclusions de dunitas y otras rocas ultrmaficas en las rocas volcanicas de Lanzarote y Fuenteventura, Estudious Geologicos, v. XXV, 1969.
26. Siena, Ridge to Hot-Spot Evolution of the Atlantic Lithospheric Mantle: Evidence from Lanzarote Peridotite Xenoliths Canary Islands, J. Petrology, Special Volume, v. 2, 1991.
27. Suzuki, Grain boundaries enrichment of incomptable elements in some mantle periditites, Chem. Geol., 1987., doi:https://doi.org/10.1016/0009-25418790169-0
28. Vance, He, Sr and Nd isotopes in xenoliths from Hawaii and other oceanic islands, Earth Planet. Sci. Lett., 1992., doi:https://doi.org/10.1016/0012-821X8990129-5
29. Yamamoto, Noble gas isotopic compositions of mantle xenoliths from northwestern Pacific lithosphere, Chem. Geol., v. 268, 2009.
