| | Journal (article/letter/editorial) | Northern Ireland The isotopic comp~i~on of carbonatite =a kimberlite carbonates andtheir bearing on...on the carbon isotopie composition ranges of carbonatite and kimberlite carbonates shows that they are...isotopio oomposition of carbonates from 22 selected carbonatite complexes ( --6*1yW, 8 = fl*40/, vs PDB) is indistingnishable...groupings e.g. carbonate lavas, tui% and intusive carbonatites associated with the Eastern Rift yield a range...~~bona~s of higher @a content ( -2.4 to -4~433. If carbonatite and kimberlite carbonates ae well as diamonds | | | Report (issue) | Industrial minerals in developing countries: British Geological Survey/Association of Geoscientists... Industrial minerals in developing countries: British Geological Survey/Association of Geoscientists...1999, Geochemical characteristics of Cretaceous carbonatites from Angola: Journal of African Earth Sciences... Industrial minerals in developing countries: British Geological Survey and Association of Geoscientists...285, p. 77-83. Argentina National Mining Secretariat, 1994, Mining Investment in Argentina: Directory | | | Journal (article/letter/editorial) | manganese concentrations exceed the range seen in carbonatite and mantle xenolith carbonates and are distinctly...authorized users. H. M. Aird (&) A. E. Boudreau Division of Earth and Ocean Sciences, Duke University,...bodies of ultramafic and mafic magma and of carbonatites, on both a local and a regional scale. Keywords...composed of olivine and poikilitic orthopyroxene.) No biotite is present in this sample. Some exsolution of clinopyroxene...associated with hydrous, latemagmatic minerals, such as biotite and hornblende, and display no greenschist facies | | | Book | impression 1989 Third impression 1991 Reprinted 1992 British Library Cataloguing in Publication Data Hall, Anthony...Trachytes and phonolites 418 12 Nephelinites and carbonatites 439 13 Kimberlites and ultrapotassic igneous...of basalt were erupted in the Miocene in the Columbia River province to the east. Andesite volcanism did...Lengai, the only volcano known to have erupted carbonatite lava in historic time. In the Western Rift valley...the only ones to erupt in the mainland USA and Canada, but there are in fact many other Recent volcanoes |
|