Abstract
This review and evaluation seeks to clarify the controversial origins of the Umbria-Latium Ultra-alkaline District (ULUD) and the Vulture carbonatitic occurrence (Intramontane Ultra-alkaline Province, IUP) and their relation to the Roman Comagmatic Province (RCP). Generally, the geochemical and isotopic features of the IUP can be linked to those of the RCP. Hence, the rocks of the ULUD district, together with part of the Tuscan and Roman Province generated in the last 2 Ma can be ascribed to a complex interplay of two subduction events related to magmatism associated with the European and Adria slabs associated with the effect of a slab window below the Italian Peninsular. Carbonate sediments together with pelagic-terrigenous sediment played a major role in the metasomatism of the mantle wedge beneath the IUP, and perhaps all along the transect from southern Italy (Eolian Islands magmatism) to north-central Italy (Tuscan and Umbria magmatism). A diffuse CO2 + H2O metasomatic front produced the condition necessary for the formation of carbonatitic magmatism. However, even where carbonatites are related to continental rift system (i.e., OIB), an origin for MORB-sediment convective recycling melting in the mantle has been hypothesized [i.e., 1].
Highlights
Recent work by [2] pointed out that there are more than 500 carbonatitic occurrences worldwide which causes new interest for studying them and understanding the associated genetic processes
This review and evaluation seeks to clarify the controversial origins of the Umbria-Latium Ultra-alkaline District (ULUD) and the Vulture carbonatitic occurrence (Intramontane Ultra-alkaline Province, IUP) and their relation to the Roman Comagmatic Province (RCP)
The vast literature on the Italian peninsula has focused attention on two conflicting hypothesis differing over the role of recent slab subduction: 1) The origin of the PlioPleistocene Quaternary volcanism is a consequence of Neogene subduction of the Adria plate below the Tyrrhenian sea [e.g., 17-20 and references therein]; and 2) The presence of the carbonatitic rocks (ULUD and Vulture, i.e. IUP) and their tectonic setting is taken to suggest that the Italian peninsula is associated with postcollisional rifting [e.g., 21-23 and references therein] with the Italian magmas being derived from a deep mantle plume [9,10]
Summary
Recent work by [2] pointed out that there are more than 500 carbonatitic occurrences worldwide which causes new interest for studying them and understanding the associated genetic processes. Seems anomalous to find carbonatitic rocks, and their presence can play a major role 1) to shed light on the Italian tectonic setting [e.g., 8-12], and 2) to contribute to the understanding of the genesis of carbonatitic rocks. The recycling character of the carbonated eclogite triggers metasomatic processes in the upper mantle. The vast literature on the Italian peninsula has focused attention on two conflicting hypothesis differing over the role of recent slab subduction: 1) The origin of the PlioPleistocene Quaternary volcanism is a consequence of Neogene subduction of the Adria plate below the Tyrrhenian sea [e.g., 17-20 and references therein]; and 2) The presence of the carbonatitic rocks (ULUD and Vulture, i.e. IUP) and their tectonic setting is taken to sug-. The hypothesis of the presence of the European plate dipping southward [e.g., 24-26] and a recent subducted slab dipping westward are supported by geophysical studies [e.g., 20,24,25,27-35]
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