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The Stability of Hydrous Mantle Phases

Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany, e-mail: Dan.Frost@uni-bayreuth.de

The first 20% of the full text of this article appears below.

	INTRODUCTION

 
It is widely recognized that hydrous minerals are involved in a number of geochemical processes in the Earth’s mantle (Michael 1988; Thompson 1992; Schmidt and Poli 1998). Their presence affects the onset of melting (Lambert and Wyllie 1968; Mysen and Boettcher 1975) and can control the partitioning of trace elements during partial melting (Adam et al. 1993; Ionov and Hoffmann 1995; La Tourrette et al. 1995; Tiepolo et al. 2000). They have accordingly been implicated in the source regions of many types of magmas including alkaline basalts and highly-potassic lavas (Edgar and Vukadinovic 1992; Foley 1992; Halliday et al. 1995; Yang et al. 2003; Elkins-Tanton and Grove 2003; Conceicao and Green 2004). As well as being intimately linked with the occurrence of mantle metasomatism (Bailey 1982; Roden and Murthy 1985), hydrous phases can also buffer fluid compositions in the mantle (Eggler 1978; Wyllie 1978) and consequently dictate the style of metasomatism. The dehydration or melting of hydrous minerals in subducting lithosphere and associated infiltration of hydrous solutions (fluids or melts) into the overlying mantle wedge are important steps in the production of island arc magmatism (Tatsumi et al. 1986; Kushiro 1987; Ulmer 2001). Conversely, the persistence of some hydrous minerals in cold regions of subduction zones may result in the transport of hydrogen into the deep mantle (Bose and Ganguly 1995; Kawamoto et al. 1995). It is therefore important to ascertain the conditions at which hydrous minerals are stable in the mantle and to recognize the situations where they breakdown and release H₂O. The presence of H₂O in the upper mantle can lead to the production of . . . [Full Text of this Article]

This article has been cited by other articles:

				A. C. Hack, A. B. Thompson, and M. Aerts Phase Relations Involving Hydrous Silicate Melts, Aqueous Fluids, and Minerals Reviews in Mineralogy and Geochemistry, July 1, 2007; 65(1): 129 - 185. [Full Text] [PDF]