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• W2344981234 abstract "The Quaternary Moctezuma volcanic fi eld at the foothills of the Sierra Madre Occidental, Mexico, is characterized by a close association of tholeiitic and alkaline magmas. The vents of the tholeiitic magmatism (1.7 Ma), which forms the overall mesa morphology of the volcanic fi eld, lie along the major faults that defi ne the eastern margin of the Moctezuma basin. This half-graben formed during the early Miocene as indicated by the emplacement of basaltic fl ows (22.3 Ma), which were intercalated with fanconglomerates of the Baucarit Formation. The youngest volcanics are alkaline lavas (0.53 Ma), which erupted from scoria cones located in the center of the basin. The main mineralogical difference between the Quaternary tholeiitic and alkaline lavas is the composition of the clinopyroxenes: they are Ca-rich in the alkaline lavas, whereas they are subcalcic with orthopyroxene or pigeonite in the tholeiitic lavas. The geochemical data show a gradual change in the characteristics of the lavas. The Sr and Nd isotopic compositions, and the shape of the mid-oceanic-ridge basalt (MORB)-normalized pat- terns, are similar to oceanic island basalt suites, suggesting that the source of the Moct- ezuma volcanic fi eld lavas was dominated by asthenospheric mantle. The absence of mantle or granulite xenoliths in the Moctezuma volcanic fi eld lavas, compared to the neighboring Geronimo volcanic fi eld, refl ects slower ascent rates. The Southern Cordillera Basaltic Andesite (SCORBA)-type geochemical sig- nature of the early Miocene synextensional basalts of Moctezuma compared to the Quaternary Moctezuma volcanic fi eld lavas can be correlated with a progressive thin- ning of the mantle lithosphere during the Neogene." @default.
• W2344981234 created "2016-06-24" @default.
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• W2344981234 date "2003-01-01" @default.
• W2344981234 modified "2023-09-27" @default.
• W2344981234 title "The Quaternary Moctezuma volcanic field: A tholeiitic to alkali basaltic episode in the central Sonoran Basin and Range Province, Mexico" @default.
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• W2344981234 doi "https://doi.org/10.1130/0-8137-2374-4.439" @default.
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