Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/114983
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Type: Journal article
Title: Melt reintegration modelling: Testing against a subsolidus reference assemblage
Author: Alessio, K.
Hand, M.
Morrissey, L.
Kelsey, D.
Payne, J.
Citation: Geosciences, 2017; 7(3):75-1-75-21
Publisher: MDPI AG
Issue Date: 2017
ISSN: 2076-3263
2076-3263
Statement of
Responsibility: 
Kiara L. Alessio, Martin Hand, Laura J. Morrissey, David E. Kelsey and Justin L. Payne
Abstract: Phase equilibria modelling incorporating melt reintegration offers a methodology to create hypothetical rock compositions that may have existed prior to melt loss, allowing the potential prograde evolution of rocks to be explored. However, melt reintegration modelling relies on assumptions concerning the volume of melt that was lost and is generally restricted by the absence of direct constraints on the pre-anatectic mineral assemblages. Mg-rich granulite in the 514–490 Ma Delamerian Orogen in southern Australia contains spinel–cordierite symplectic intergrowths that surround rare, coarse blocky domains of sillimanite. These sillimanite cores, as well as the widespread presence of andalusite in lower grade areas of the southern Delamerian Orogen, suggest that the subsolidus precursor to the granulite contained andalusite. This provides the opportunity to test if melt reintegration modelling of the granulite predicts subsolidus andalusite. Stepwise down-temperature melt reintegration modelling produces a water-saturated solidus after the addition of 12 mol% melt. When modelled at subsolidus conditions, the resulting rock composition produces andalusite-bearing assemblages with andalusite modes similar to the abundance of the sillimanite-cored spinel–cordierite intergrowths. The modelling results from this case study suggest that melt reintegration modelling is a valid method to recreate prograde subsolidus bulk rock compositions.
Keywords: P-T pseudosection; low pressure metamorphism; delamerian orogen; melt reintegration; melt loss
Description: Published: 29 August 2017
Rights: © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
RMID: 0030076073
DOI: 10.3390/geosciences7030075
Grant ID: http://purl.org/au-research/grants/arc/DP160101006
http://purl.org/au-research/grants/arc/LP160100578
http://purl.org/au-research/grants/arc/DP160104637
Appears in Collections:Earth and Environmental Sciences publications

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