Hydrous mafic-ultramafic intrusives in a nascent arc (Massif du Sud, New Caledonia ophiolite)
Articolo
Data di Pubblicazione:
2021
Citazione:
Hydrous mafic-ultramafic intrusives in a nascent arc (Massif du Sud, New Caledonia ophiolite) / A. Secchiari, A. Montanini, D. Cluzel, E. Ferrari. - (2021 Jul 31). ((Intervento presentato al convegno EGU General Assembly 2021 tenutosi a Virtual nel 2021 [10.5194/egusphere-egu21-10634].
Abstract:
indicate enrichments for FME (i.e. Rb, Ba, U) and Th, coupled to Zr-Hf depletion. Strong Sr positive
spikes are only observed for the crosscutting dikes, while the pyroxenite body yields Sr negative
anomalies.
Geochemical modelling shows that the putative liquids in equilibrium with the websterites have
intermediate Mg# (57–63) and incompatible trace element patterns sharing remarkable
similarities with the New Caledonia CE-boninites [5]. However, they significantly differ from the
equilibrium melts reported for the other intrusive rocks of the sequence [1, 4], suggesting greater
compositional variability for the liquids ascending into the Moho transition zone and lower crust.
Our results support the notion that petrological and geochemical heterogeneity of magmatic products may be distinctive features of subduction infancy.
Tipologia IRIS:
23 - Pubblicazione su portale
Elenco autori:
A. Secchiari, A. Montanini, D. Cluzel, E. Ferrari
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