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Water- and boron-rich melt inclusions in quartz from the Malkhan Pegmatite, Transbaikalia, Russia


Thomas, R and Davidson, P and Badanina, E, Water- and boron-rich melt inclusions in quartz from the Malkhan Pegmatite, Transbaikalia, Russia, Minerals, 2, (4) pp. 435-458. ISSN 2075-163X (2012) [Refereed Article]


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DOI: doi:10.3390/min2040435


In this paper we show that the pegmatite-forming processes responsible for the formation of the Malkhan pegmatites started at magmatic temperatures around 720 C. The primary melts or supercritical fluids were very water- and boron-rich (maximum values of about 10% (g/g) B2O3) and over the temperature interval from 720 to 600 C formed a pseudobinary solvus, indicated by the coexistence of two types of primary melt inclusions (type-A and type-B) representing a pair of conjugate melts. Due to the high water and boron concentration the pegmatite-forming melts are metastable and can be characterized either as genuine melts or silicate-rich fluids. This statement is underscored by Raman spectroscopic studies. This study suggested that the gel state proposed by some authors cannot represent the main stage of the pegmatite-forming processes in the Malkhan pegmatites, and probably in all others. However there are points in the evolution of the pegmatites where the gel- or gel-like state has left traces in form of real gel inclusions in some mineral in the Malkhan pegmatite, however only in a late, fluid dominated stage.

Item Details

Item Type:Refereed Article
Keywords: melt inclusion, fluid inclusion, gel inclusion, water, boron and cesium determination, pegmatite genesis
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
UTAS Author:Davidson, P (Dr Paul Davidson)
ID Code:82241
Year Published:2012
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:21
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2013-01-22
Last Modified:2015-07-16
Downloads:280 View Download Statistics

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