Matches in SemOpenAlex for { <https://semopenalex.org/work/W2042279102> ?p ?o ?g. }
- W2042279102 endingPage "265" @default.
- W2042279102 startingPage "247" @default.
- W2042279102 abstract "This study presents new geochemical data on 26 mafic lavas from the Middle Atlas and Central Morocco volcanic provinces, including Miocene nephelinites and Pliocene–Quaternary (3.9–0.6 Ma) nephelinites, basanites, alkali and subalkaline basalts. Most of them represent near-primary magmas, although some alkali basalts were derived from the minor fractionation of olivine and diopside phenocrysts. These evolved samples and the subalkaline basalt display higher 207Pb/204Pb and Zr/Nb ratios and lower εNd consistent with their contamination by lower crustal granulites during an open fractionation process. The progressive enrichment in incompatible elements observed from alkali basalts to nephelinites suggests their derivation from decreasing partial melting degrees of an enriched mantle source located at the garnet–spinel transition zone. The strong negative spikes observed for K in multielement patterns indicate that this source contained a residual pargasitic amphibole. We propose that partial melting occurred at around 2 GPa, i.e. near the lithosphere–asthenosphere boundary beneath the Middle Atlas (60–80 km). The trace element and isotopic Sr–Nd–Pb–Hf signature of the uncontaminated lavas displays a geochemical flavour intermediate between those of high μ (HIMU), “C”, and enriched mantle components. It is very similar to that of abundant metasomatic amphibole- and clinopyroxene-rich lithospheric peridotites and pyroxenites carried by Middle Atlas lavas, which likely represent an analog of the source of these lavas. It is therefore not necessary to postulate the contribution of a “fresh” asthenospheric mantle to their genesis. We propose that they resulted from the partial melting of the base of a veined lithospheric mantle metasomatised during the late Cretaceous by alkaline melts from the Central Atlantic plume, the ancestor of the Canary plume. Melting was probably triggered by the flux of a hot mantle within a regional SW–NE sub-lithospheric channel, in response to either the Alboran slab retreat or edge-driven convection around the West African craton." @default.
- W2042279102 created "2016-06-24" @default.
- W2042279102 creator A5001922079 @default.
- W2042279102 creator A5005599325 @default.
- W2042279102 creator A5022505162 @default.
- W2042279102 creator A5033398966 @default.
- W2042279102 creator A5048115807 @default.
- W2042279102 creator A5062501861 @default.
- W2042279102 date "2014-09-01" @default.
- W2042279102 modified "2023-10-17" @default.
- W2042279102 title "Lithospheric origin for Neogene–Quaternary Middle Atlas lavas (Morocco): Clues from trace elements and Sr–Nd–Pb–Hf isotopes" @default.
- W2042279102 cites W1485043829 @default.
- W2042279102 cites W1533507126 @default.
- W2042279102 cites W1965146289 @default.
- W2042279102 cites W1969700311 @default.
- W2042279102 cites W1971796795 @default.
- W2042279102 cites W1973012528 @default.
- W2042279102 cites W1973423590 @default.
- W2042279102 cites W1974309946 @default.
- W2042279102 cites W1974463006 @default.
- W2042279102 cites W1974626411 @default.
- W2042279102 cites W1976065033 @default.
- W2042279102 cites W1976788449 @default.
- W2042279102 cites W1978236055 @default.
- W2042279102 cites W1978658483 @default.
- W2042279102 cites W1980544584 @default.
- W2042279102 cites W1982385055 @default.
- W2042279102 cites W1984234561 @default.
- W2042279102 cites W1985957692 @default.
- W2042279102 cites W1987706934 @default.
- W2042279102 cites W1989734738 @default.
- W2042279102 cites W1990720986 @default.
- W2042279102 cites W1990737863 @default.
- W2042279102 cites W2000174130 @default.
- W2042279102 cites W2000678005 @default.
- W2042279102 cites W2003948785 @default.
- W2042279102 cites W2008297722 @default.
- W2042279102 cites W2015150069 @default.
- W2042279102 cites W2017046697 @default.
- W2042279102 cites W2018282154 @default.
- W2042279102 cites W2021134883 @default.
- W2042279102 cites W2022584012 @default.
- W2042279102 cites W2022840996 @default.
- W2042279102 cites W2027124220 @default.
- W2042279102 cites W2028213559 @default.
- W2042279102 cites W2028446699 @default.
- W2042279102 cites W2035642076 @default.
- W2042279102 cites W2037546356 @default.
- W2042279102 cites W2038979071 @default.
- W2042279102 cites W2039239402 @default.
- W2042279102 cites W2041048697 @default.
- W2042279102 cites W2041193569 @default.
- W2042279102 cites W2041514871 @default.
- W2042279102 cites W2042133113 @default.
- W2042279102 cites W2042423268 @default.
- W2042279102 cites W2045563607 @default.
- W2042279102 cites W2047128953 @default.
- W2042279102 cites W2048704100 @default.
- W2042279102 cites W2049597178 @default.
- W2042279102 cites W2050660059 @default.
- W2042279102 cites W2053342234 @default.
- W2042279102 cites W2055731982 @default.
- W2042279102 cites W2067997488 @default.
- W2042279102 cites W2073485883 @default.
- W2042279102 cites W2073649073 @default.
- W2042279102 cites W2075502267 @default.
- W2042279102 cites W2076566162 @default.
- W2042279102 cites W2078356250 @default.
- W2042279102 cites W2080229244 @default.
- W2042279102 cites W2080394669 @default.
- W2042279102 cites W2080813174 @default.
- W2042279102 cites W2082472863 @default.
- W2042279102 cites W2084285443 @default.
- W2042279102 cites W2084658941 @default.
- W2042279102 cites W2086227631 @default.
- W2042279102 cites W2089866577 @default.
- W2042279102 cites W2089901911 @default.
- W2042279102 cites W2090206242 @default.
- W2042279102 cites W2090455350 @default.
- W2042279102 cites W2092811366 @default.
- W2042279102 cites W2096088931 @default.
- W2042279102 cites W2100287838 @default.
- W2042279102 cites W2100486566 @default.
- W2042279102 cites W2105958021 @default.
- W2042279102 cites W2106411979 @default.
- W2042279102 cites W2113451750 @default.
- W2042279102 cites W2114397557 @default.
- W2042279102 cites W2117110377 @default.
- W2042279102 cites W2117262678 @default.
- W2042279102 cites W2119899013 @default.
- W2042279102 cites W2125654971 @default.
- W2042279102 cites W2130931042 @default.
- W2042279102 cites W2131039827 @default.
- W2042279102 cites W2133610516 @default.
- W2042279102 cites W2135130189 @default.
- W2042279102 cites W2137289440 @default.
- W2042279102 cites W2137427519 @default.
- W2042279102 cites W2137696584 @default.