Pb-Sr-Nd isotopic compositions and trace element geochemistry of megacrysts and melilitites from the Tertiary Urach volcanic field: source composition of small volume melts under SW Germany
Article Abstract:
High radiogenic ratios of the lead isotopes 206Pb and 204Pb are present in in the megacrysts and melilitites of the Tertiary Urach volcanic field, in southwest Germany. High 207Pb/ 204Pb ratios indicate the absence of old crustal elements. Analysis of the composition of strontium isotopes indicates a long-term source evolution of the megacrysts. Neodymium isotopic ratios for the megacrysts and the melilitites are similar. The rare earth element compositions of the melilitites are similar to those in the ocean island basalts.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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Isotopic relationships of volatile and lithophile trace elements in continental ultramafic xenoliths
Article Abstract:
The analysis of the isotopic compositions of several continental ultramafic xenoliths serves as a guide for determining the continental lithospheric events that lead to trace-element enrichment. The concentrations and levels of Sr, Nd, Pb, He and C are measured in order to identify the distribution of the trace-elements in different areas. The He isotopic compositions, which is within the range of mid-ocean-ridge basalts, has determined a well-mixed upper mantle crust through the expansion of ridge basalts.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Mineralogy and geochemistry of Devonian ultramafic minor intrusions of the southern Kola Peninsula, Russia: implications for the petrogenesis of kimberlites and melilitites
Article Abstract:
A mineralogical and geochemical study was conducted on kimberlite and melilitites intrusions on the southern coast of the Kola Peninsula, Russia. Results showed that the Terskii Coast kimberlites represent an asthenospheric end-member, while the monticellite kimberlite and melilitites represent a shallow lower lithospheric end-member. These results suggest that a Devonian mantle plume impacted on the base of the lithosphere that resulted in a spectrum of magmas emplaced in the peninsula.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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