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Occurrence and origin of andalusite in Peraluminous felsic igneous rocks

Clarke, Barrie; Dorais, Michael; Barbarin, Bernard; Barker, Dan; Cesare, Bernardo; Clarke, G L; El Baghdadi, Mohamed; Erdmann, Saskia; Forster, Hans-Jurgen; Gaeta, Mario; Gottesmann, Barbel; Jamieson, Rebecca; Kontak, Daniel; Koller, Friedrich; Gomes, Carlos; London, David; Morgan, George; Neves, Luis, J.P.F.; Pattison, David RM; Pereira, Alcides J.S.C.; Pichavant, Michel; Rapela, Carlos W; Renno, Axel; Richards, Simon; Roberts, Malcolm; Rottura, Alessandro; Saavedra, J; Sial, Alcides; Toselli, Alejandro; Ugidos, Jose; Uher, Pavel; Villaseca, Carlos; Visonà, Dario; Whitney, Donna; Williamson, Ben; Woodard, Henry


Andalusite occurs as an accessory mineral in many types of peraluminous felsic igneous rocks, including rhyolites, aplites, granites, pegmatites, and anatectic migmatites. Some published stability curves for And = Sil and the water-saturated granite solidus permit a small stability field for andalusite in equilibrium with felsic melts. We examine 108 samples of andalusite-bearing felsic rocks from more than 40 localities world-wide. Our purpose is to determine the origin of andalusite,...[Show more]

dc.contributor.authorClarke, Barrie
dc.contributor.authorDorais, Michael
dc.contributor.authorBarbarin, Bernard
dc.contributor.authorBarker, Dan
dc.contributor.authorCesare, Bernardo
dc.contributor.authorClarke, G L
dc.contributor.authorEl Baghdadi, Mohamed
dc.contributor.authorErdmann, Saskia
dc.contributor.authorForster, Hans-Jurgen
dc.contributor.authorGaeta, Mario
dc.contributor.authorGottesmann, Barbel
dc.contributor.authorJamieson, Rebecca
dc.contributor.authorKontak, Daniel
dc.contributor.authorKoller, Friedrich
dc.contributor.authorGomes, Carlos
dc.contributor.authorLondon, David
dc.contributor.authorMorgan, George
dc.contributor.authorNeves, Luis, J.P.F.
dc.contributor.authorPattison, David RM
dc.contributor.authorPereira, Alcides J.S.C.
dc.contributor.authorPichavant, Michel
dc.contributor.authorRapela, Carlos W
dc.contributor.authorRenno, Axel
dc.contributor.authorRichards, Simon
dc.contributor.authorRoberts, Malcolm
dc.contributor.authorRottura, Alessandro
dc.contributor.authorSaavedra, J
dc.contributor.authorSial, Alcides
dc.contributor.authorToselli, Alejandro
dc.contributor.authorUgidos, Jose
dc.contributor.authorUher, Pavel
dc.contributor.authorVillaseca, Carlos
dc.contributor.authorVisonà, Dario
dc.contributor.authorWhitney, Donna
dc.contributor.authorWilliamson, Ben
dc.contributor.authorWoodard, Henry
dc.description.abstractAndalusite occurs as an accessory mineral in many types of peraluminous felsic igneous rocks, including rhyolites, aplites, granites, pegmatites, and anatectic migmatites. Some published stability curves for And = Sil and the water-saturated granite solidus permit a small stability field for andalusite in equilibrium with felsic melts. We examine 108 samples of andalusite-bearing felsic rocks from more than 40 localities world-wide. Our purpose is to determine the origin of andalusite, including the T-P-X controls on andalusite formation, using eight textural and chemical criteria: size-compatibility with grain sizes of igneous minerals in the same rock; shape-ranging from euhedral to anhedral, with no simple correlation with origin; state of aggregation-single grains or clusters of grains; association with muscovite-with or without rims of monocrystalline or polycrystalline muscovite; inclusions--rare mineral inclusions and melt inclusions; chemical composition-andalusite with little significant chemical variation, except in iron content (0·08-1·71 wt % FeO); compositional zoning--concentric, sector, patchy, oscillatory zoning cryptically reflect growth conditions; compositions of coexisting phases-biotites with high siderophyllite-eastonite contents (Al iv ≈ 2·68 ± 0·07 atoms per formula unit), muscovites with 0·57-4·01 wt % FeO and 0·02-2·85 wt % TiO2, and apatites with 3· 53 ± 0·18 wt % F. Coexisting muscovite-biotite pairs have a wide range of F contents, and FBt = 1·612F Ms + 0·015. Most coexisting minerals have compositions consistent with equilibration at magmatic conditions. The three principal genetic types of andalusite in felsic igneous rocks are: Type 1 Metamorphic-(a) prograde metamorphic (in thermally metamorphosed peraluminous granites), (b) retrograde metamorphic (inversion from sillimanite of unspecified origin), (c) xenocrystic (derivation from local country rocks), and (d) restitic (derivation from source regions); Type 2 Magmatic-(a) peritectic (water-undersaturated, T↑) associated with leucosomes in migmatites, (b) peritectic (water-undersaturated, T↓), as reaction rims on garnet or cordierite, (c) cotectic (water-undersaturated, T↓) direct crystallization from a silicate melt, and (d) pegmatitic (water-saturated, T↓), associated with aplite-pegmatite contacts or pegmatitic portion alone; Type 3 Metasomatic-(water-saturated, magma-absent), spatially related to structural discontinuities in host, replacement of feldspar and/or biotite, intergrowths with quartz. The great majority of our andalusite samples show one or more textural or chemical criteria suggesting a magmatic origin. Of the many possible controls on the formation of andalusite (excess Al2O 3, water concentration and fluid evolution, high Be-B-Li-P, high F, high Fe-Mn-Ti, and kinetic considerations), the two most important factors appear to be excess Al2O3 and the effect of releasing water (either to strip alkalis from the melt or to reduce alumina solubility in the melt). Of particular importance is the evidence for magmatic andalusite in granites showing no significant depression of the solidus, suggesting that the And = Sil equilibrium must cross the granite solidus rather than lie below it. Magmatic andalusite, however formed, is susceptible to supra- or sub-solidus reaction to produce muscovite. In many cases, textural evidence of this reaction remains, but in other cases muscovite may completely replace andalusite leaving little or no evidence of its former existence.
dc.publisherOxford University Press
dc.sourceJournal of Petrology
dc.subjectKeywords: andalusite; felsic rock; petrology Andalusite; Granite; Magmatic; Origin; Xenocrystic
dc.titleOccurrence and origin of andalusite in Peraluminous felsic igneous rocks
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.type.statusPublished Version
local.contributor.affiliationClarke, Barrie, Dalhousie University
local.contributor.affiliationDorais, Michael, Brigham Young University
local.contributor.affiliationBarbarin, Bernard, Universite Blase Pascal
local.contributor.affiliationBarker, Dan, University of Texas
local.contributor.affiliationCesare, Bernardo, Universita di Padova
local.contributor.affiliationClarke, G L, University of Sydney
local.contributor.affiliationEl Baghdadi, Mohamed, Beni Mellai
local.contributor.affiliationErdmann, Saskia, Dalhousie University
local.contributor.affiliationForster, Hans-Jurgen, GeoForschungsZentrum
local.contributor.affiliationGaeta, Mario, Universita Degli Studi Di Roma
local.contributor.affiliationGottesmann, Barbel, GeoForschungsZentrum
local.contributor.affiliationJamieson, Rebecca, Dalhousie University
local.contributor.affiliationKontak, Daniel, Nova Scotia Department of Natural Resources
local.contributor.affiliationKoller, Friedrich, University of Vienna
local.contributor.affiliationGomes, Carlos, Universidade do Minho
local.contributor.affiliationLondon, David, University of Oklahoma
local.contributor.affiliationMorgan, George, University of Oklahoma
local.contributor.affiliationNeves, Luis, J.P.F., Universidad De Coimbra
local.contributor.affiliationPattison, David RM, University of Calgary
local.contributor.affiliationPereira, Alcides J.S.C., Universidad de Coimbra
local.contributor.affiliationPichavant, Michel, ISTO
local.contributor.affiliationRapela, Carlos W, Universidad Nacional de La Plata
local.contributor.affiliationRenno, Axel, University of Freiburg
local.contributor.affiliationRichards, Simon, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationRoberts, Malcolm, Council for Geoscience
local.contributor.affiliationRottura, Alessandro, Universita di Bologna
local.contributor.affiliationSaavedra, J, Instituto de Agrobiologia y Recursos Naturales
local.contributor.affiliationSial, Alcides, University of Pernambuco
local.contributor.affiliationToselli, Alejandro, Universidad Nacional De tucuman
local.contributor.affiliationUgidos, Jose, Facultad De Ciencias
local.contributor.affiliationUher, Pavel, Comenius University
local.contributor.affiliationVillaseca, Carlos, Universidad Complutense de Madrid
local.contributor.affiliationVisonà, Dario, Universita di Padova
local.contributor.affiliationWhitney, Donna, University of Minnesota
local.contributor.affiliationWilliamson, Ben, Natural History Museum
local.contributor.affiliationWoodard, Henry, Beloit College
CollectionsANU Research Publications


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