Carbon isotopic thermometry and geobarometry of sillimanite isograd in thermal aureoles: the depth of emplacement of upper crustal granitic bodies

Okuyama-Kusunose, Yasuko; Morikiyo, Toshiro; Kawabata, Akiko; Uyeda, Akira

doi:10.1007/s00410-003-0479-5

Cited by 4 publications

(1 citation statement)

References 49 publications

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“…Wada & Suzuki (1983) studied this system in a contact aureole, and, as noted earlier, their calibration fits regional metamorphic data in this study very well. Similarly, Okuyama‐Kusunose et al. (2003) found smooth variation in Δ cal‐gr values in three different contact aureoles, and, although they do not have independent thermometry, they concluded that carbon isotopes had in fact equilibrated at temperatures in the range 560–595 °C, using the calibrations of Kitchen & Valley (1995) and Polyakov & Kharlashina (1995).…”

Section: Discussionmentioning

confidence: 99%

Calcite–graphite isotope thermometry in amphibolite facies marble, Bancroft, Ontario

Dunn¹

2005

Journal Metamorphic Geology

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This study presents calcite-graphite carbon isotope fractionations for 32 samples from marble in the northern Elzevir terrane of the Central Metasedimentary Belt, Grenville Province, southern Ontario, Canada. These results are compared with temperatures calculated by calcite-dolomite thermometry (15 samples), garnet-biotite thermometry (four samples) and garnet-hornblende thermometry (three samples). D cal-gr values vary regularly across the area from >6.5& in the south to 4.0& in the north, which corresponds to temperatures of 525°C in the south to 650°C in the north. Previous empirical calibration of the calcite-graphite thermometer agrees very well with calcite-dolomite, garnet-biotite and garnet-hornblende thermometry, whereas, theoretical calibrations compare less well with the independent thermometry. Isograds in marble based on the reactions rutile + calcite + quartz ¼ titanite and tremolite + calcite + quartz ¼ diopside, span temperatures of 525-600°C and are consistent with calculated temperature-X(CO 2 ) relations. Results of this study compare favourably with large-scale regional isotherms, however, local variation is greater than that revealed by large-scale sampling strategies. It remains unclear whether the temperature-D cal-gr relationship observed in natural materials below 650°C represents equilibrium fractionations or not, but the regularity and consistency apparent in this study demonstrate its utility for thermometry in amphibolite facies marble.

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Section: Discussionmentioning

confidence: 99%

Calcite–graphite isotope thermometry in amphibolite facies marble, Bancroft, Ontario

Dunn¹

2005

Journal Metamorphic Geology

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Metamorphic evolution of the contact aureole of the Jhirgadandi pluton, Sonbhadra district, Mahakoshal mobile belt, central India

et al. 2013

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The metamorphic evolution of the contact aureole around the Late Paleoproterozoic Jhirgadandi pluton in the eastern part of Parsoi Formation of Mahakoshal terrain, central India represents three distinct metamorphic zones, characterized by definite mineral assemblages. The contact-metamorphic event produced the peak-metamorphic mineral assemblages Bt + Qtz + Alb + Sil ± Cd ± Grt ± Mus ± Kfs in the metapelites of inner aureole, Bt + Qtz + And + Mus + Kfs + Plag ± Cd ± Chl in middle aureole and Chl + Mus + Bt ± And + Alb + Qtz ± Ep + Mt ± tourmaline in the outer aureole. The estimated P-T conditions based on detailed geothermobarometric calculations in the thermal metamorphosed rocks are 690 • C/3.4 kbar, 580 ± 15 • C and 487 ± 30 • C in inner aureole, middle aureole and outer aureole, respectively. The variation in metamorphic condition suggests that the shallow crustal level emplacement of Jhirgadandi pluton is responsible for the overprinting of contact metamorphic assemblages (M 2) in the low grade metapelites (regional metamorphism M 1) of Mahakoshal Group.

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Genetic link between uranium mineralization and the emplacement of limited intrusion adjacent to alkaline granites, Abu Hamr area, north Eastern Desert, Egypt

Dessouky

2018

Arab J Geosci

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Carbon isotopic thermometry and geobarometry of sillimanite isograd in thermal aureoles: the depth of emplacement of upper crustal granitic bodies

Cited by 4 publications

References 49 publications

Calcite–graphite isotope thermometry in amphibolite facies marble, Bancroft, Ontario

Calcite–graphite isotope thermometry in amphibolite facies marble, Bancroft, Ontario

Metamorphic evolution of the contact aureole of the Jhirgadandi pluton, Sonbhadra district, Mahakoshal mobile belt, central India

Genetic link between uranium mineralization and the emplacement of limited intrusion adjacent to alkaline granites, Abu Hamr area, north Eastern Desert, Egypt

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