Strontium and neodymium isotopic study of the western Mogollon-Datil volcanic region, New Mexico, USA
Article Abstract:
The strontium and neodymium isotopic study of Mogollon-Datil volcanic rocks revealed that the assimilation and fractional crystallization model of the felsic flow can follow either a mantle-sourced magma content from the Kilbourne Hole, New Mexico or an upper crust source with isotopic ratios resembling those of Texas Canyon Granite, Arizona. Compositional analyses of different samples from other suites likewisesupport the two-component model of mantle-crustal zone interaction during timesof volcanic activity.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Ce and Nd isotope geochemistry on island arc volcanic rocks with negative Ce anomaly: existence of sources with concave REE patterns in the mantle beneath the Solomon and Bonin island arcs
Article Abstract:
Isotopic cesium, neodymium and strontium ratios as well as rare earth element patterns and barium and strontium compositions of igneous rocks from the Solomon and Bonin island arcs are reported and compared with that of oceanic sediment. The values for isotopic ratio rules out simple mixing by mid oceanic ridge basalts and oceanic or continental crust as the source of the rocks. Rather, results imply that the rocks came from precambrian sources which, in turn, came from a chondritic uniform reservoir.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Sr and Nd isotope data of apatite, calcite and dolomite as indicators of source, and the relationships of phoscorites and carbonatites from the Kovdor massif, Kola peninsula, Russia
Article Abstract:
A study of the Sr and Nd isotopic forms in apatite, calcite and dolomite, obtained from phoscorites and carbonatites, of Kovdor massif, Kola peninsula, Russia, shows that the rocks contain at least three mantle components. The Kovdor carbonatites and phoscorites have many similarities, indicating the presence of similar conditions during their formation. There are at least two distinct groups of phoscorite and carbonatite. Analysis of the isotopic data is given.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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