Heterogeneous sources beneath a mature plumbing system in the Aegean arc: evidence from the magma evolution of the Milos volcanic system
Grosche A, Haase K, Klemd R, Voudouris PC (2026)
Publication Type: Journal article
Publication year: 2026
Journal
Book Volume: 181
Article Number: 56
Journal Issue: 7
DOI: 10.1007/s00410-026-02334-9
Abstract
The Aegean arc is known for its along-arc geochemical variations due to different mantle sources, subducted sediment input, and distinct magma storage and eruption conditions. In contrast to the other Aegean arc volcanoes, the Milos volcanic system is dominated by intermediate to felsic volcanic products, suggesting an extensive magma evolution during ascent through the arc crust. New trace element and Sr-Nd-Pb isotope data of lavas from Milos compared to the other islands indicate the presence of a more depleted mantle wedge beneath Milos, similar to Santorini, and confirm previous models of an increasing influence of subducted sediment from the Central to the Western Aegean arc. Lavas from the western and eastern parts of Milos island exhibit distinct trace element and Pb isotope ratios irrespective of the temporal evolution of the magmatic activity that can be explained by a heterogeneous sediment mixture and more pronounced crustal assimilation in the lavas of East Milos. Amphibole thermobarometry of andesitic to rhyolitic lavas and basaltic enclaves indicates that mantle-derived melts stagnate and fractionate at pressures of ~ 450 MPa in the lower crust, whereas more evolved melts stagnate at ~ 200 MPa in the upper crust prior to eruption. Pre-eruptive magma temperatures are estimated by plagioclase-liquid thermometry between 840 and 940 °C. Increasing felsic lava production with time in the long-lived (3 Ma) Milos volcanic field is in accordance with a mature magma plumbing system that is characterized by lower and upper crustal magma storage. The geochemical diversity of volcanic rocks of Milos reflects the complex interplay of multiple magmatic processes within the broader Aegean arc.
Authors with CRIS profile
Anna Grosche
Lehrstuhl für Endogene Geodynamik (LEG)
Karsten Haase
Lehrstuhl für Endogene Geodynamik (LEG)
Reiner Klemd
Professur für Geochemie von Lagerstätten
Involved external institutions
Greece (GR)How to cite
APA:
Grosche, A., Haase, K., Klemd, R., & Voudouris, P.C. (2026). Heterogeneous sources beneath a mature plumbing system in the Aegean arc: evidence from the magma evolution of the Milos volcanic system. Contributions To Mineralogy and Petrology, 181(7). https://doi.org/10.1007/s00410-026-02334-9
MLA:
Grosche, Anna, et al. "Heterogeneous sources beneath a mature plumbing system in the Aegean arc: evidence from the magma evolution of the Milos volcanic system." Contributions To Mineralogy and Petrology 181.7 (2026).
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