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Minerals 2012, 2(4), 435-458; doi:10.3390/min2040435
Article

Water- and Boron-Rich Melt Inclusions in Quartz from the Malkhan Pegmatite, Transbaikalia, Russia

1,* , 2
 and 3
Received: 16 August 2012; in revised form: 24 October 2012 / Accepted: 25 October 2012 / Published: 15 November 2012
(This article belongs to the Special Issue Advances in Economic Minerals)
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Abstract: 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.
Keywords: melt inclusion; fluid inclusion; gel inclusion; water; boron and cesium determination; pegmatite genesis melt inclusion; fluid inclusion; gel inclusion; water; boron and cesium determination; pegmatite genesis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Thomas, R.; Davidson, P.; Badanina, E. Water- and Boron-Rich Melt Inclusions in Quartz from the Malkhan Pegmatite, Transbaikalia, Russia. Minerals 2012, 2, 435-458.

AMA Style

Thomas R, Davidson P, Badanina E. Water- and Boron-Rich Melt Inclusions in Quartz from the Malkhan Pegmatite, Transbaikalia, Russia. Minerals. 2012; 2(4):435-458.

Chicago/Turabian Style

Thomas, Rainer; Davidson, Paul; Badanina, Elena. 2012. "Water- and Boron-Rich Melt Inclusions in Quartz from the Malkhan Pegmatite, Transbaikalia, Russia." Minerals 2, no. 4: 435-458.


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