Experimental study of the Fe-Mg exchange between garnet and biotite; constraints on the mixing behavior and analysis of the cation-exchange mechanisms

Geßmann, C. K.; Spiering, B.; Raith, M.

doi:10.2138/am-1997-11-1218

Cited by 42 publications

(26 citation statements)

References 35 publications

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“…Thermobarometric estimates assuming near-equilibrium compositions of the high-Mg garnet rim and the most Ferich biotites (Gt-Bt calibration of Gessmann et al, 1997), in combination with the garnet-plagioclase-kyanite-quartz barometer (Koziol and Newton, 1988;Koziol, 1989 calibration) yield c. 570-600°C and 8-9.5 kbar (Fig. 3b), for the metamorphic peak.…”

Section: Metamorphismmentioning

confidence: 99%

“…Thermobarometry assuming near-equilibrium between the high-Mg garnet cores and the most Fe-rich large biotites in the matrix, combining garnet-plagioclase-kyanite-quartz barometry (GASP) and Gt-Bt thermometry (using the most recent Gt-Bt thermometer of Gessmann et al, 1997, and the GASP barometer calibration of Koziol and Newton, 1988;Koziol, 1989), yield estimates of the metamorphic peak to c. 700°C and 8 kbar (Fig. 3a).…”

Section: Metamorphismmentioning

confidence: 99%

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Crustal evolution and metamorphism in east-central Eritrea, south-east Arabian-Nubian Shield

Andersson

Ghebreab

Teklay

2006

Journal of African Earth Sciences

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Section: Metamorphismmentioning

confidence: 99%

Section: Metamorphismmentioning

confidence: 99%

Crustal evolution and metamorphism in east-central Eritrea, south-east Arabian-Nubian Shield

Andersson

Ghebreab

Teklay

2006

Journal of African Earth Sciences

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“…2) attests a pressure below 4 kbar (Spear et al 1999). The Grt-Bt thermometer (using garnet rim compositions and adjacent biotites) gives temperatures in the range of *550-630°C at 1-3 kbar, depending on the calibration chosen (Holdaway 2000;Holdaway et al 1997;Gessmann et al 1997;Kleeman and Reinhardt 1994). The muscovite-biotite thermometer of Hoisch (1989) gives somewhat lower temperatures of 520-540°C (at 1-3 kbar), as does the plagioclase-white mica K-Na exchange thermometer of Green and Usdansky (1986).…”

Section: The Metapelitesmentioning

confidence: 99%

The Moslavačka Gora crystalline massif in Croatia: a Cretaceous heat dome within remnant Ordovician granitoid crust

et al. 2010

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For a long time the Moslavačka Gora Massif in Croatia has been regarded as a major outcrop of Variscan crystalline basement of the South Tisia block. However, new geochronological data indicate that this massif consists of a Cretaceous S-type granite pluton intruding a Cretaceous low-pressure/high-temperature (LP/HT) metamorphic envelope. The age of the LP/HT metamorphism is estimated at *90-100 Ma using the method of electron microprobe based monazite dating. The Central Granite was dated at 82 ± 1 Ma (LA-SF-ICP-MS zircon age). The metamorphic complex comprises mainly felsic anatexites and orthogneisses of granitic composition, some metapelites (paragneisses and mica schists) and amphibolites. Zircons from three different samples of metagranite were dated at 486 ± 6, 483 ± 6, and 491 ± 1 Ma, suggesting that most of the metamorphic complex represents an Early Ordovician granitic series. The Cretaceous regional metamorphism culminated in granulite facies conditions of *750°C and 3-4 kbar. A retrograde metamorphic event at lower amphibolite facies conditions overprinted the metamorphic complex. This event is probably related to the intrusion of the Central Granite. The southeastern sector of the massif was additionally affected by post-granitic, predominantly NE oriented shearing at greenschist facies conditions. As yet there is no clear evidence for Variscan events in the Moslavačka Gora Massif. Mineral relics of a medium-pressure amphibolite facies metamorphism are preserved in amphibolites. They are older than the Cretaceous LP/HT regional metamorphism, but their age is presently unknown. Some indications for a Permian regional metamorphic event are provided by inherited zircons in the Central Granite that have been dated with a Permian age, and by Permian monazite relics in metapelites. The Cretaceous high heat flow regime recorded in the Moslavačka Gora Massif is unique in the subcrop of the Pannonian Basin and may be a local feature triggered by a mafic intrusion in the lower crust.

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“…4). The calibrations include the Grt-Bt thermometers (Thompson 1976;Holdway & Lee 1977;Ferry & Spear 1978;Hodges & Spear 1982;Perchuk & Lavrent'eva 1983;Dasgupta et al 1991;Bhattacharya et al 1992;Gessmann et al 1997;Kaneko & Miyano 2004 ; Table S4), and Grt-Sil-Pl-Qtz (Hodges & Spear 1982) and Grt-BtPl-Qtz (Wu et al 2004), barometers (Table S5). A thermometric diagram of Zr-M index (Watson & Harrison 1983) was used for peraluminous granites (Fig.…”

Section: Geothermobarometrymentioning

confidence: 99%

Geochemical characteristics and conditions of formation of the Chah-Bazargan peraluminous granitic patches, ShahrBabak, Iran

Fazlnia¹

2017

Geologica Carpathica

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Xenoliths of garnet-biotite-kyanite schist from the Qori metamorphic complex (southern part of the Sanandaj-Sirjan zone, northeast Neyriz, Zagros orogen in Iran) in the 173.0±1.6 Ma Chah-Bazargan leuco-quartz diorite intrusion were studied. This intrusion caused these schist xenoliths to be metamorphosed to the pyroxene hornfels facies (approximately 4.5±1.0 kbar and 760±35 °C), converting them to diatexite migmatite as a result of partial melting of the xenoliths. These melts are granites in composition. Melt volumes of 20 to 30 vol. % were calculated for small patches of the peraluminous granites. It is possible that anatectic melting affected only the leucosome, such that melting was more than 20 to 30 vol. %. It is possible that a large amount of melt was not extracted due to balanced in situ crystallization, the adhesion force between melt and crystal (restite), and high viscosity of the leucosome. The Chah-Bazargan peraluminous granites are depleted in trace elements such as REEs, HFSE (Ti, Zr, Ta, Nb, Th, U, Hf, Y), Ba, Pb, and Sr. These elements are largely insensitive to source enrichment, but sensitive to the amounts of main and accessory minerals. These elements were hosted by minerals such as garnet, biotite, muscovite, K-feldspar, plagioclase, ilmenite, apatite, monazite, and zircon in the source (diatexitic migmatitic xenoliths).

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Experimental study of the Fe-Mg exchange between garnet and biotite; constraints on the mixing behavior and analysis of the cation-exchange mechanisms

Cited by 42 publications

References 35 publications

Crustal evolution and metamorphism in east-central Eritrea, south-east Arabian-Nubian Shield

Crustal evolution and metamorphism in east-central Eritrea, south-east Arabian-Nubian Shield

The Moslavačka Gora crystalline massif in Croatia: a Cretaceous heat dome within remnant Ordovician granitoid crust

Geochemical characteristics and conditions of formation of the Chah-Bazargan peraluminous granitic patches, ShahrBabak, Iran

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