Abstract
The magmatic evolution of the Variscan Albtal pluton, Schwarzwald, SW Germany, is explored using detailed textural observations and the chemical composition of plagioclase and biotite in both granite and its mafic magmatic enclaves (MMEs). MMEs probably formed in a two-step process. First, mafic magma intruded a granitic magma chamber and created a boundary layer, which received thermal and compositional input from the mafic magma. This is indicated by corroded “granitic” quartz crystals and by large “granitic” plagioclase xenocrysts, which contain zones of higher anorthite and partly crystallized from a melt of higher Sr content. Texturally, different plagioclase types (e.g. zoned and inclusion-rich types) correspond to different degrees of overprint most likely caused by a thermal and compositional gradient in the boundary layer. The intrusion of a second mafic magma batch into the boundary layer is recorded by a thin An50 zone along plagioclase rims that crystallized from a melt enriched in Sr. Most probably, the second mafic intrusion caused disruption of the boundary layer, dispersal of the hybrid magma in the granite magma and formation of the enclaves. Rapid thermal quenching of the MMEs in the granite magma is manifested by An30 overgrowths on large plagioclase grains that contain needle apatites. Our results demonstrate the importance of microtextural investigations for the reconstruction of possible mixing end members in the formation of granites.
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References
Altherr R, Henjes-Kunst F, Langer C, Otto J (1999) Interaction between crustal-derived felsic and mantle-derived mafic magmas in the Oberkirch pluton (European Variscides, Schwarzwald, Germany). Contrib Mineral Petrol 137:304–322. doi:10.1007/s004100050552
Barbarin B (2005) Mafic magmatic enclaves and mafic rocks associated with some granitoids of the central Sierra Nevada batholith, California: nature, origin, and relations with the hosts. Lithos 80:155–177 http://dx.doi.org/10.1016/j.lithos.2004.05.010
Barbarin B, Didier J (1992) Genesis and evolution of mafic microgranular enclaves through various types of interaction between coexisting felsic and mafic magmas. Earth Environ Sci Trans R Soc Edinb 83:145–153. doi:10.1017/S0263593300007835
Bateman R, Martín MP, Castro A (1992) Mixing of cordierite granitoid and pyroxene gabbro, and fractionation, in the Santa Olalla tonalite (Andalucia). Lithos 28:111–131. doi:10.1016/0024-4937(92)90027-V
Blundy JD, Shimizu N (1991) Trace element evidence for plagioclase recycling in calc-alkaline magmas. Earth Planet Sci Lett 102:178–197. doi:10.1016/0012-821X(91)90007-5
Blundy JD, Wood BJ (1991) Crystal-chemical controls on the partitioning of Sr and Ba between plagioclase feldspar, silicate melts, and hydrothermal solutions. Geochim Cosmochim Acta 55:193–209. doi:10.1016/0016-7037(91)90411-W
Brophy JG, Dorais MJ, Donnelly-Nolan J, Singer BS (1996) Plagioclase zonation styles in hornblende gabbro inclusions from Little Glass Mountain. Medicine Lake volcano, California: implications for fractionation mechanisms and the formation of composition gaps. Contrib Mineral Petrol 126:121–136. doi:10.1007/s004100050239
Büsch W, Otto J (1980) Endogenetic inclusions in granites of the Black Forest, Germany Neues Jahrbuch für Mineralogie, Monatshefte 269–282
Büttner S, Kruhl JH (1997) The evolution of a late-Variscan high-T/low-P region: the southeastern margin of the Bohemian massif. Geol Rundsch 86:21–38. doi:10.1007/s005310050119
Cashman K, Blundy J (2013) Petrological cannibalism: the chemical and textural consequences of incremental magma body growth. Contrib Mineral Petrol 166:703–729. doi:10.1007/s00410-013-0895-0
Chappell BW (1996) Magma mixing and the production of compositional variation within granite suites: evidence from the granites of Southeastern Australia. J Petrol 37:449–470. doi:10.1093/petrology/37.3.449
Clemens JD, Stevens G (2012) What controls chemical variation in granitic magmas? Lithos 134–135:317–329. doi:10.1016/j.lithos.2012.01.001
Clemens JD, Helps PA, Stevens G (2009) Chemical structure in granitic magmas—a signal from the source? Earth Environ Sci Trans R Soc Edinb 100:159–172. doi:10.1017/S1755691009016053
Clynne MA (1999) A complex magma mixing origin for rocks erupted in 1915 Lassen Peak, California. J Petrol 40:105–132. doi:10.1093/petroj/40.1.105
Coombs ML, Eichelberger JC, Rutherford MJ (2003) Experimental and textural constraints on mafic enclave formation in volcanic rocks. J Volcanol Geotherm Res 119:125–144. doi:10.1016/S0377-0273(02)00309-8
Couch S, Sparks RSJ, Carroll MR (2001) Mineral disequilibrium in lavas explained by convective self-mixing in open magma chambers. Nature 411:1037–1039
Couch S, Harford CL, Sparks RSJ, Carroll MR (2003) Experimental constraints on the conditions of formation of highly calcic plagioclase microlites at the Soufrire Hills volcano, Montserrat. J Petrol 44:1455–1475. doi:10.1093/petrology/44.8.1455
Davidson JP, Hora JM, Garrison JM, Dungan MA (2005) Crustal forensics in arc magmas. J Volcanol Geotherm Res 140:157–170. doi:10.1016/j.jvolgeores.2004.07.019
Didier J, Barbarin B (1991) The different types of enclaves in granites—nomenclature. In: Didier J, Barbarin B (eds) Enclaves and granite petrology. Developments in petrology, vol 13. Elsevier, Amsterdam, pp 19–23
Eichelberger JC (1978) Andesitic volcanism and crustal evolution. Nature 275:21–27
Eichelberger JC (1980) Vesiculation of mafic magma during replenishment of silicic magma reservoirs. Nature 288:446–450
Eisbacher GH, Lüschen E, Wickert F (1989) Crustal-scale thrusting and extension in the Hercynian Schwarzwald and Vosges, central Europe. Tectonics 8:1–21. doi:10.1029/TC008i001p00001
Emmermann R (1968) Differentiation und Metasomatose des Albtalgranits (Südschwarzwald). N Jahrb Mineral Abh 109:96–130
Emmermann R, Daieva L, Schneider J (1975) Petrologic significance of rare earths distribution in granites. Contrib Mineral Petrol 52:267–283. doi:10.1007/BF00401457
Eroglu S, Schoenberg R, Wille M, Beukes N, Taubald H (2015) Geochemical stratigraphy, sedimentology, and Mo isotope systematics of the ca. 2.58–2.50 Ga-old transvaal supergroup carbonate platform, South Africa. Precambrian Res 266:27–46. doi:10.1016/j.precamres.2015.04.014
Farner MJ, Lee C-TA, Putirka KD (2014) Mafic–felsic magma mixing limited by reactive processes: a case study of biotite-rich rinds on mafic enclaves. Earth Planet Sci Lett 393:49–59. doi:10.1016/j.epsl.2014.02.040
Flood RH, Shaw SE (2014) Microgranitoid enclaves in the felsic Looanga monzogranite, New England Batholith, Australia: pressure quench cumulates. Lithos 198–199:92–102. doi:10.1016/j.lithos.2014.03.015
Furman T, Spera FJ (1985) Co-mingling of acid and basic magma with implications for the origin of mafic I-type xenoliths: field and petrochemical relations of an unusual dike complex at eagle lake, Sequoia National Park, California, U.S.A. J Volcanol Geotherm Res 24:151–178. doi:10.1016/0377-0273(85)90031-9
Hann HP, Chen F, Zedler H, Frisch W, Loeschke J (2003) The Rand granite in the southern Schwarzwald and its geodynamic significance in the Variscan belt of SW Germany. Int J Earth Sci 92:821–842. doi:10.1007/s00531-003-0361-8
Hegner E, Chen F, Hann HP (2001) Chronology of basin closure and thrusting in the internal zone of the Variscan belt in the Schwarzwald, Germany: evidence from zircon ages, trace element geochemistry, and Nd isotopic data. Tectonophysics 332:169–184. doi:10.1016/S0040-1951(00)00254-7
Hibbard MJ (1991) Textural anatomy of twelve magma-mixed granitoid systems. In: Didier J, Barbarin B (eds) Enclaves and granite petrology. Developments in petrology, vol 13. Elsevier, London, pp 431–444
Hibbard MJ (1995) Petrography to petrogenesis, 1st edn. Prentice Hall, Upper Saddle River
Hoefs J, Emmermann R (1983) The oxygen isotope composition of Hercynian granites and pre-Hercynian gneisses from the Schwarzwald, SW Germany. Contrib Mineral Petrol 83:320–329. doi:10.1007/BF00371200
Hogan JP (1993) Monomineralic glomerocrysts: textural evidence for mineral resorption during crystallization of igneous rocks. J Geol 101:531–540. doi:10.2307/30068805
Humphreys MCS, Blundy JD, Sparks RSJ (2006) Magma evolution and open-system processes at Shiveluch volcano: insights from phenocryst zoning. J Petrol 47:2303–2334. doi:10.1093/petrology/egl045
Johannes W, Holtz F (1996) Petrogenesis and experimental petrology of granitic rocks. Minerals and rocks, vol 22. Springer, Heidelberg
Kalt A, Grauert B, Baumann A (1994) Rb-Sr and U-Pb isotope studies on migmatites from the Schwarzwald (Germany): constraints on isotopic resetting during Variscan high-temperature metamorphism. J Metamorph Geol 12:667–680. doi:10.1111/j.1525-1314.1994.tb00050.x
Koteas GC, Williams ML, Seaman SJ, Dumond G (2010) Granite genesis and mafic-felsic magma interaction in the lower crust. Geology 38:1067–1070. doi:10.1130/g31017.1
Lange RA, Frey HM, Hector J (2009) A thermodynamic model for the plagioclase-liquid hygrometer/thermometer. Am Mineral 94:494–506. doi:10.2138/am.2009.3011
LeMaitre RW (2002) Igneous rocks: a classification and glossary of terms; recommendations of the International Union of Geological Sciences, Subcommission on the Systematics of Igneous Rocks, 2nd edn. Cambridge University Press, Cambridge
Liew TC, Hofmann AW (1988) Precambrian crustal components, plutonic associations, plate environment of the Hercynian Fold Belt of central Europe: indications from a Nd and Sr isotopic study. Contrib Mineral Petrol 98:129–138. doi:10.1007/BF00402106
Marschall HR, Kalt A, Hanel M (2003) P-t evolution of a variscan lower-crustal segment: a study of granulites from the Schwarzwald, Germany. J Petrol 44:227–253. doi:10.1093/petrology/44.2.227
Martin VM, Pyle DM, Holness MB (2006) The role of crystal frameworks in the preservation of enclaves during magma mixing. Earth Planet Sci Lett 248:787–799. doi:10.1016/j.epsl.2006.06.030
Nakamura M, Shimakita S (1998) Dissolution origin and syn-entrapment compositional change of melt inclusion in plagioclase. Earth Planet Sci Lett 161:119–133. doi:10.1016/S0012-821X(98)00144-7
Neves SP, Vauchez A (1995) Successive mixing and mingling of magmas in a plutonic complex of Northeast Brazil. Lithos 34:275–299. doi:10.1016/0024-4937(94)00012-Q
Panjasawatwong Y, Danyushevsky L, Crawford A, Harris K (1995) An experimental study of the effects of melt composition on plagioclase-melt equilibria at 5 and 10 kbar: implications for the origin of magmatic high-An plagioclase. Contrib Mineral Petrol 118:420–432. doi:10.1007/s004100050024
Perugini D, Poli G (2012) The mixing of magmas in plutonic and volcanic environments: analogies and differences. Lithos 153:261–277. doi:10.1016/j.lithos.2012.02.002
Pietranik A, Koepke J (2009) Interactions between dioritic and granodioritic magmas in mingling zones: plagioclase record of mixing, mingling and subsolidus interactions in the Gęsiniec intrusion NE Bohemian Massif, SW Poland. Contrib Mineral Petrol 158:17–36. doi:10.1007/s00410-008-0368-z
Pietranik A, Koepke J (2014) Plagioclase transfer from a host granodiorite to mafic microgranular enclaves: diverse records of magma mixing. Mineral Petrol 1–14 doi:10.1007/s00710-014-0326-6
Pietranik A, Waight TE (2008) Processes and sources during late Variscan Dioritic-Tonalitic magmatism: insights from plagioclase chemistry (gęsiniec intrusion, NE Bohemian Massif, Poland). J Petrol 49:1619–1645. doi:10.1093/petrology/egn040
Pietranik A, Koepke J, Puziewicz J (2006) Crystallization and resorption in plutonic plagioclase: implications on the evolution of granodiorite magma (Gęsiniec granodiorite, strzelin crystalline Massif, SW Poland) Lithos 86:260–280 http://dx.doi.org/10.1016/j.lithos.2005.05.008
Pitcher WS (1997) The nature and origin of granite, 2 nd edn. Chapman & Hall, London; Weinheim [u.a.]
Reubi O, Blundy J (2009) A dearth of intermediate melts at subduction zone volcanoes and the petrogenesis of arc andesites. Nature 461:1269–1273
Schaltegger U (2000) U-Pb geochronology of the Southern Black Forest Batholith (Central Variscan Belt): timing of exhumation and granite emplacement. Int J Earth Sci 88:814–828. doi:10.1007/s005310050308
Schuler C (1983) Die interne SR-Isotopensystematik des herzynischen Albtalgranits (Schwarzwald). Zürich, Techn. Hochsch., Diss., 1983, Zürich
Singer BS, Dungan MA, Layne GD (1995) Textures and Sr, Ba, Mg, Fe, K and Ti compositional profiles in volcanic plagioclase clues to the dynamics of calc-alkaline magma chambers. Am Mineral 80:776–798
Sisson TW, Grove TL, Coleman DS (1996) Hornblende gabbro sill complex at Onion valley, California, and a mixing origin for the Sierra Nevada batholith. Contrib Mineral Petrol 126:81–108. doi:10.1007/s004100050237
Sparks RSJ, Marshall LA (1986) Thermal and mechanical constraints on mixing between mafic and silicic magmas. J Volcanol Geotherm Res 29:99–124. doi:10.1016/0377-0273(86)90041-7
Stenger R (1979) Petrographie und Geochemie der endogenen Einschlüsse im Albtalgranit (Südschwarzwald). Jahresheft des geologischen Landesamtes Baden-Württemberg 21:89–106
Ubide T, Galé C, Larrea P, Arranz E, Lago M, Tierz P (2014) The relevance of crystal transfer to magma mixing: a case study in composite dykes from the central pyrenees. J Petrol 55:1535–1559. doi:10.1093/petrology/egu033
Ustunisik G, Kilinc A, Nielsen RL (2014) New insights into the processes controlling compositional zoning in plagioclase. Lithos 200–201:80–93. doi:10.1016/j.lithos.2014.03.021
Waight TE, Maas R, Nicholls IA (2001) Geochemical investigations of microgranitoid enclaves in the S-type Cowra Granodiorite, Lachlan Fold Belt, SE Australia. Lithos 56:165–186. doi:10.1016/S0024-4937(00)00053-0
Weidendorfer D, Mattsson HB, Ulmer P (2014) Dynamics of Magma Mixing in Partially crystallized magma chambers: textural and petrological constraints from the basal complex of the austurhorn intrusion (SE Iceland). J Petrol 55:1865–1903. doi:10.1093/petrology/egu044
Wiebe RA, Smith D, Sturm M, King EM, Seckler MS (1997) Enclaves in the Cadillac Mountain granite (coastal maine): samples of hybrid magma from the base of the chamber. J Petrol 38:393–423. doi:10.1093/petroj/38.3.393
Wimmenauer W (1963) Einschlüsse im Albtalgranite (Südschwarzwald) und ihre Bedeutung für dessen Vorgeschichte. Neues Jahrbuch für Mineralogie, Monatshefte 1:6–17
Wyllie PJ, Cox KG, Biggar GM (1962) The habit of apatite in synthetic systems and igneous rocks. J Petrol 3:238–243. doi:10.1093/petrology/3.2.238
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Simone Kaulfuß is thanked for preparing the thin sections. Wolfgang Siebel, two anonymous reviewers and Editor Wolf-Christian Dullo gave thoughtful comments that improved the paper.
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Michel, L., Wenzel, T. & Markl, G. Interaction between two contrasting magmas in the Albtal pluton (Schwarzwald, SW Germany): textural and mineral-chemical evidence. Int J Earth Sci (Geol Rundsch) 106, 1505–1524 (2017). https://doi.org/10.1007/s00531-016-1363-7
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DOI: https://doi.org/10.1007/s00531-016-1363-7