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Evidence of a water-rich silica gel state during the formation of a simple pegmatite

Citation

Thomas, R and Davidson, P, Evidence of a water-rich silica gel state during the formation of a simple pegmatite, Mineralogical Magazine, 76, (7) pp. 2785-2801. ISSN 0026-461X (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 The Mineralogical Society

DOI: doi:10.1180/minmag.2012.076.7.11

Abstract

This study reports the discovery of inclusions, which are inferred to represent trapped primary silicate gels, in simple pegmatites genetically connected to the Precambrian Rønne granite of Bornholm Island, Denmark. These inclusions are randomly associated with more typical melt and alkali-carbonate-rich and bicarbonate-rich fluid inclusions. Their relationship to the latter and to the formation of the pegmatite bodies is discussed. The silicate gel inclusions become increasingly common towards the quartz cores of the pegmatites, and are considered to demonstrate increasing water and alkali carbonate concentrations in the pegmatite-forming liquid, and an accompanying tendency for sol/gel formation. This discovery may have important implications for the formation of the quartz cores of pegmatites. The possible origin of the alkali-carbonate concentrations in pegmatite-forming fluids is also briefly discussed.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Davidson, P (Dr Paul Davidson)
ID Code:82239
Year Published:2012
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:11
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2013-01-22
Last Modified:2015-07-16
Downloads:0

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