Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/12467
Authors: | Mazzeo, F. C.* Arienzo, Ilenia* Aulinas, M.* Casalini, M.* Di Renzo, V.* D’Antonio, Massimo* |
Title: | Mineralogical, geochemical and isotopic characteristics of alkaline mafic igneous rocks from Punta delle Pietre Nere (Gargano, Southern Italy) | Journal: | Lithos | Series/Report no.: | /308(2018) | Publisher: | Elsevier | Issue Date: | 2018 | DOI: | 10.1016/j.lithos.2018.03.015 | Keywords: | Punta delle Pietre Nere Anorogenic magmatism Isotope geochemistry Mantle plume Anorogenic magmatism Mantle plume |
Abstract: | The Punta delle Pietre Nere (Gargano, Southern Italy) igneous body is constituted by gabbroic and syenitic rocks with lamprophyric affinity of different age (58 and 62 Ma, respectively). The chemical composition of the minerals clearly indicates that there is no genetic relationship between the two lithotypes, in agreement with their significant age difference. The chemical (trace elements) and Sr-Nd-Pb-isotopic composition of these rocks highlights an “anorogenic” geochemical affinity derived from mixed DMM-HIMU-EM mantle reservoirs, similarly to other Paleogene-Oligocenemagmatic provinces in the Circum-Mediterranean Area. In past literature, these features were interpreted as evidences for enriched asthenospheric mantle plume upwelling from deep regions beneath the Western Europe. Here we suggest that the HIMU-like composition of Punta delle Pietre Nere rocks is related to a lithosphericmantle source bearing amphibole-rich veins, resulting from crystallization of melts within the amphibole stability field in presence of H2O, as shown by several experimental works. Our results suggests partial melting at 70–90 km depth, which corresponds to the spinel-garnet transition (2.5–3.5 GPa) close to the amphibole stability limit (~90–110 km and 2.5–3.5 GPa). |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
article.pdf | 4.44 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
50
1
checked on Feb 8, 2021
Page view(s)
213
checked on Apr 17, 2024
Download(s)
2
checked on Apr 17, 2024