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Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition

Published online by Cambridge University Press:  03 December 2018

Wei-(RZ) Wang ,
Geoffrey Clarke ,
Nathan R. Daczko  and
Yue Zhao
Wei-(RZ) Wang*
Affiliation:
Institute of Geomechanics, Chinese Academy of Geosciences, Beijing 100081, China School of Geosciences, F09, University of Sydney, Sydney, NSW 2006, Australia State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Geoffrey Clarke
Affiliation:
School of Geosciences, F09, University of Sydney, Sydney, NSW 2006, Australia
Nathan R. Daczko
Affiliation:
GEMOC ARC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia
Yue Zhao
Affiliation:
Institute of Geomechanics, Chinese Academy of Geosciences, Beijing 100081, China
*
Author for correspondence: Wei-(RZ) Wang, Email: wangwei0521@gmail.com
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Abstract

Low-pressure regional aureoles with steep metamorphic field gradients are critical to understanding progressive metamorphism in high-temperature metasedimentary rocks. Delicately layered pelitic and psammitic metasedimentary rocks at Mt Stafford, central Australia, record a greenschist- to granulite-facies Palaeoproterozoic regional aureole, associated with S-type granite plutons, reflecting metamorphism in the range 500–800 °C and at ∼3 kbar. The rocks experienced minimal deformation during metamorphism and partial melting. Partial melting textures evolve progressively along the steep metamorphic field gradient from the incipient stages of melting marked by cuspate grains with low dihedral angles, to melt proportions sufficient to form diatexite with schollen. Phase equilibria modelling in the NCKFMASHTO system for pelitic, semi-pelitic and high- and low-ferromagnesian psammitic samples quantitatively illustrates the dependence of partial melting on rock composition and water volume. Pelitic compositions are more fertile than psammitic compositions when the water content in the rocks is low, especially during the early stages of melting. The whole-rock ferromagnesian component additionally influences melt fertility, with ferromagnesian-rich psammite being more fertile than psammite with a lower ferromagnesian component. Subtle variations in free water content can result in obvious changes in melt volume but limited variation in melt composition. Distinct melting histories of pelitic and psammitic rocks inferred from field relationships may be partially attributed to potential differences in water volume retained to super-solidus conditions. Melt composition is more dependent on the rock composition than the variation in water content.

Keywords

melt productivity and compositionwater contentresiduummigmatite
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 8 , August 2019 , pp. 1400 - 1424
Copyright
© Cambridge University Press 2018 

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