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Geochemical systematics of Pb isotopes, fluorine, and sulfur in melt inclusions from São Miguel, Azores.
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2017 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 485, p. 22-37Article in journal (Refereed) Published
Abstract [en]

Pb isotopic measurements in olivine-hosted melt inclusions of ocean island basalts (OIBs) from São Miguel, Azores, reflect the high 207Pb/204Pb and 208Pb/204Pb at a given 206Pb/204Pb of their host lavas. The data are consistent with mixing between two endmembers: the first (the Central Group) has relatively high 208Pb/206Pb and is similar to the component sampled by Graciosa and Faial, and the second is a radiogenic endmember (with low 208Pb/206Pb) that we refer to as the Nordeste component. F and Cl concentrations measured in the same melt inclusions from São Miguel represent parental abundances unmodified by crustal assimilation. Based on undegassed F and Cl concentrations, the source beneath São Miguel is volatile-rich. Pb-isotope composition of the melt inclusions correlates positively with S concentration: we attribute this correlation to the dissolution of oceanic crust sulfides in the S-undersaturated basaltic melt of the Nordeste component. These blebs were then assimilated by the São Miguel magma and the magma droplets were later trapped in olivines.

When comparing melt inclusions from worldwide OIBs representing mantle endmembers, we find an overall negative correlation between F/Nd and 208Pb/206Pb for volcanic glasses and melt inclusions. The high F/Nd (up to 40) endmember is represented by HIMU melt inclusions and the low F/Nd (down to 14) by EM1 Pitcairn glasses. São Miguel melt inclusions have an intermediate F/Nd of 23.1 ± 3.4.

Place, publisher, year, edition, pages
2017. Vol. 485, p. 22-37
National Category
Geochemistry
Research subject
The changing Earth
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URN: urn:nbn:se:nrm:diva-2668DOI: 10.1016/j.chemgeo.2017.03.024OAI: oai:DiVA.org:nrm-2668DiVA, id: diva2:1166905
Available from: 2017-12-17 Created: 2017-12-17 Last updated: 2017-12-18Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0009254117301651

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