Strongly SiO2-undersaturated, CaO-rich kamafugitic Pleistocene magmatism in Central Italy (San Venanzo volcanic complex) and the role of shallow depth limestone assimilation

Subduction‐Legacy and Olivine Monitoring for Mantle‐Heterogeneities of the Sources of Ultrapotassic Magmas: The Italian Case Study

“…As stated in Section 6.2, the time span between mantle metasomatism and partial mantle melting has to be relatively short implying metasomatism has taken place in the course of the Apennine subduction. Mantle contamination and limited limestone assimilation are two processes not necessarily mutually exclusive (Iacono‐Marziano et al., 2007, 2008; Lustrino et al., 2020); the assimilation of certain quantities of bedrock limestone by the kamafugite magmas in the last stages of their evolution is suggested by the presence of resorbed rims showing an increase in Ca concentrations demonstrated by all olivine grains (e.g., Figure 4).…”

Element Partitioning and Li‐O Isotope Fractionation Between Silicate Minerals and Crustal‐Derived Carbonatites and Their Implications

“…Subsequently, more comprehensive investigations on microtextures and chemical compositions were conducted on carbonatites and associated silicate volcanic rocks in well‐known occurrences. Many carbonatites worldwide are now explained as partial melts of impure limestones and their metamorphic equivalents at crustal depths (e.g., Ferrero et al., 2016; Floess et al., 2015; Hegner et al., 2020; Liu et al., 2006; Wang, Su, Chen, et al., 2021; Wu et al., 2022), or assimilation of those rocks by ascending magmas (e.g., Innocenzi et al., 2021; Lustrino et al., 2016, 2020). Carbonatites of typical crustal origin have several common characteristics that are distinctive from those that are mantle‐derived, including (a) emplacement within orogenic belts, (b) marble/limestone‐ and metamorphic silicate rock‐dominated country rocks, (c) calciocarbonatitic compositions with extremely enriched multi‐isotopic signatures (e.g., heavier C and O isotope compositions than primary mantle‐derived carbonatites), and (d) presence of olivine and clinopyroxene as primary phases.…”

New Inferences on Magma Dynamics in Melilitite‐Carbonatite Volcanoes: The Case Study of Mt. Vulture (Southern Italy)

“…Carbonatite magmatism is mainly associated with intraplate continental tectonic settings characterized by significant extension and even rifting, with a temporal distribution from Archean to the present (e.g., Jones et al., 2013; Woolley & Kjarsgaard, 2008; Yaxley et al., 2022), and currently, Oldoinyo Lengai (Tanzania) represents the only active carbonatite volcano, characterized by a natrocarbonatitic affinity (e.g., Berkesi et al., 2020). The growing number of carbonatite occurrences from unconventional tectonic settings, such as oceanic contexts (e.g., Carnevale et al., 2021; Day, 2022; Doucelance et al., 2010; Mata et al., 2010; Schmidt & Weidendorfer, 2018) or subduction zones (e.g., D’Orazio et al., 2007; Li et al., 2018; Lustrino et al., 2019, 2020), received considerable attention during last two decades, given their importance as source of rare elements such as La, Ce, Pr, and Nd (Anenburg et al., 2021; Verplanck et al., 2016), and, most importantly, because they provide meaningful information on the geochemical cycle of carbon and mantle metasomatism as well (e.g., Bouabdellah et al., 2010; Horton, 2021).…”