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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Some thermal constraints on crustal assimilation during fractionation of hydrous, mantle-derived magmas with examples from central Alpine batholiths
Authors: Thompson, Alan Bruce
Matile, Luzius
Ulmer, Peter
DOI: 10.21256/zhaw-4757
Published in: Journal of Petrology
Volume(Issue): 43
Issue: 3
Page(s): 403
Pages to: 422
Issue Date: 2002
Publisher / Ed. Institution: Oxford University Press
ISSN: 0022-3530
Language: English
Subject (DDC): 551: Geology and hydrology
Abstract: We provide a model for the fractional crystallization of hydrous mantle-derived magma to form calc-alkaline plutons, based upon mass balance for geological examples of fractionation sequences in the lower continental crust. This is complemented by a thermal model for the heat budget obtained from a projected phase diagram and thermodynamic data. Fractional crystallization (FC) and assimilation–fractional crystallization (AFC) paths have been calculated with these models and the mass ratio of assimilation to crystallization as a function of parent magma type and temperature, crustal rock fertility and temperature, and mechanism of assimilation, have been determined. When these results are combined with F (melt fraction) and r (ratio of mass assimilated/crystallized) values evaluated from geochemical data then new information, not available with the methods separately, can be deduced. This includes when and at what depth and temperature in the crust the assimilation took place, as well as the likely parent magma type and temperature of the assimilant. Our results are presented in simple graphical fashion to facilitate future studies that examine the evolution of individual calc-alkaline plutons and the mechanisms of crustal contamination, and to improve melt models involving hydrous magma in volcanic arcs and in the lower continental crust.
Further description: erworben im Rahmen der Schweizer Nationallizenzen (
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Appears in collections:Publikationen Life Sciences und Facility Management

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