A Raman microprobe study of melt inclusions in kimberlites from Siberia, Canada, SW Greenland and South Africa.

Autor: Mernagh TP; Geoscience Australia, Canberra, ACT, Australia. Terry.Mernagh@ga.gov.au, Kamenetsky VS, Kamenetsky MB
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2011 Oct; Vol. 80 (1), pp. 82-7. Date of Electronic Publication: 2011 Feb 01.
DOI: 10.1016/j.saa.2011.01.034
Abstrakt: Raman spectroscopy has been used for the identification of both common and uncommon minerals in melt inclusions in Group-I kimberlites from Siberia, Canada, SW Greenland and South Africa. The melt inclusions all contained high abundances of alkali-Ca carbonates, with varying proportions of cations, and Na-Ca-Ba sulphates. In accordance with its dry mineralogy, no hydrated carbonates or sulphates were detected in melt inclusions from the Udachnaya-East kimberlite. In contrast, the melt inclusions in kimberlites from Canada, South Africa and SW Greenland were found to contain bassanite, pirssonite, and hydromagnesite suggesting that greater amounts of water were present in their residual magmas. This suggests that enrichment in alkali carbonates and sulphates is widespread across a range of Group-I kimberlites and implies that they commonly have an alkali-, and sulphur-rich residual liquid.
(Crown Copyright © 2011. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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