A refined garnet - biotite Fe?Mg exchange geothermometer and its application in amphibolites and granulites

Dasgupta, Somnath; Sengupta, P.; Guha, D. B.; Fukuoka, Masato

doi:10.1007/bf00687206

Cited by 150 publications

(68 citation statements)

References 22 publications

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“…Garnet biotite thermometry using the calibration of Dasgupta et al (1991) yields up to 681°C while the computation using Bhattacharya et al (1992) shows 644°C. Average temperatures using the two different calibrations show 553 621°C.…”

Section: Reaction Grid and Pressure Temperature Estimationsmentioning

confidence: 99%

Spinel+Quartz association from the Kerala khondalites, southern India: evidence for ultrahigh-temperature metamorphism

Morimoto

Santosh

Tsunogae

et al. 2004

Journal of Mineralogical and Petrological Sciences

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Granulite facies metapelites (khondalites) from Chittikara are characterized by the assemblage Grt + Sil + Bt + Crd + Spl + Kfs + Pl + Qtz ± graphite. The rocks show a series of mineral reactions such as: (1) Bt + Sil + Qtz = Grt + Crd ± Kfs, (2) Grt + Sil + Qtz = Crd, (3) Grt + Crd + Sil = Spl + Qtz , (4) Spl + Qtz = Crd, and (5) Grt + Sil = Spl + Crd. Spinel and quartz occur in direct grain contact and their stability considerations in appropriate reaction grids indicate > 950°C at 8 kbar. This, together with the ca. 1000°C temperatures derived from mesoperthites suggests ultrahigh temperature metamorphism in the khondalite belt. Electron microprobe data on the various minerals have been used to compute pressure temperature estimates from mineral phase equilibria thermobaromtery. Temperature estimates from spinel cordierite thermometry are around 900°C, while garnet cordierite thermometer yields an upper estimate of 818°C. Estimates based on garnet sillimanite plagioclase quartz barometer indicate pressures up to 8 kbar. Evaluation of the microstructures and reactions in the khondalites using available reaction grids for pelitic rocks provide evidence for peak metamorphism at high or ultrahigh temperatures followed by steep decompression from around 8 kbar down to 4 kbar. The P T path attests to a rapid exhumation history probably associated with the extensional collapse following collision of continental blocks during the assembly of Gondwana in the late Pan African.

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Section: Reaction Grid and Pressure Temperature Estimationsmentioning

confidence: 99%

Spinel+Quartz association from the Kerala khondalites, southern India: evidence for ultrahigh-temperature metamorphism

Morimoto

Santosh

Tsunogae

et al. 2004

Journal of Mineralogical and Petrological Sciences

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“…Peak metamorphic temperature for the garnet cordierite zone is estimated by employing various computations of the garnet biotite geothermometer (Ferry and Spear, 1978;Hodges and Spear, 1982;Ganguly and Saxena, 1984;Indares and Martignole, 1985;Williams and Grambling, 1990;Dasgupta et al, 1991). We did not apply other geothermometers to garnet cordierite and garnet orthopyroxene pairs, because garnets are in contact neither with cordierite nor with orthopyroxene.…”

Section: Pressure Temperature Conditionsmentioning

confidence: 99%

Staurolite-bearing gneiss and re-examination of metamorphic zonal mapping of the Higo metamorphic terrane in the Kosa area, central Kyushu, Japan

Maki

Ishizaka

Nishiyama

2004

Journal of Mineralogical and Petrological Sciences

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Staurolite bearing gneiss and re examination of metamorphic zonal mapping of the Higo metamorphic terraneJournal of Mineralogical and Petrological Sciences, Volume 99, page 1 18, 2004 Chemographic analysis of these reactions together with Grt Bt geothermometers shows the metamorphic condition of P = 200 MPa and T = 600 620°C, which is much lower in pressure than that estimated by Osanai et al. (1996) in the Toyono area, about 10 km west of Kosa.

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“…and Spear, 1982;Dasgupta et al, 1991) and GASP geobarometer. The estimated P -T conditions for the matrix stage are almost identical to those for the amphibolite -facies stage of the Gföhl migmatitic gneiss in Lower Austria (Carswell and O'Brien, 1993;Cooke, 2000;Cooke and O' Brien, 2001) (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…P -T conditions inferred from the garnet core and the matrix stages of the Gföhl gneiss are also inserted. GrtBt geothermometer; Ia: Ferry and Spear (1978); Ib: Hodges and Spear (1982); Ic: Dasgupta et al (1991); GASP geobarometer; IIa: Koziol and Newton (1988); IIb: Hodges and Spear (1982); and IIc: Perchuk et al (1985).…”

Section: Discussionmentioning

confidence: 99%

Determination of SiO2 Raman spectrum indicating the transformation from coesite to quartz in Gföhl migmatitic gneisses in the Moldanubian Zone, Czech Republic

Kobayashi

Hirajima

Hiroi

et al. 2008

Journal of Mineralogical and Petrological Sciences

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The Raman spectroscopy of more than 2000 SiO 2 inclusions in zircon separates from Gföhl migmatitic gneisses in the Nové Dvory area shows that most of the SiO 2 inclusions are composed of quartz with clear and intense peaks at 464, 393, 266, 207 and 125 cm -1 . It also reveals that a few SiO 2 inclusions have a weak but clear peak at 521 cm -1 , which is the most fundamental vibration of coesite, along with typical quartz vibrations mentioned above. The Raman spectrum is composed of the intense vibrations of quartz at 464, 393 and 266 cm -1 of quartz and the weak vibration of coesite at 521 cm -1 is obtained from the quartz proximal to the relict coesite inclusion in the pyrope of ultra -high -pressure (UHP) rocks in Dora Maira Massif. A similar Raman spectrum has been obtained for quartz transformed from coesite in UHP rocks recovered from the CCSD drillhole of the Sulu belt, eastern China. Therefore, we propose that the SiO 2 phase whose Raman spectrum shows a weak vibration at 521 cm -1 existed as coesite in the past.

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A refined garnet - biotite Fe?Mg exchange geothermometer and its application in amphibolites and granulites

Cited by 150 publications

References 22 publications

Spinel+Quartz association from the Kerala khondalites, southern India: evidence for ultrahigh-temperature metamorphism

Spinel+Quartz association from the Kerala khondalites, southern India: evidence for ultrahigh-temperature metamorphism

Staurolite-bearing gneiss and re-examination of metamorphic zonal mapping of the Higo metamorphic terrane in the Kosa area, central Kyushu, Japan

Determination of SiO2 Raman spectrum indicating the transformation from coesite to quartz in Gföhl migmatitic gneisses in the Moldanubian Zone, Czech Republic

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