Experimental study of Fe-Mg distribution between biotite and orthopyroxene at P=490 MPa

Fonarev, V. I.; Konilov, A. N.

doi:10.1007/bf00371325

Cited by 29 publications

(10 citation statements)

References 13 publications

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“…The temperature is interpreted to represent conditions at an early, pre-biotite stage in the reaction history of the granulites. Biotite-orthopyroxene pairs (reaction 5) using the data of Fonarev & Konilov (1986) indicate temperatures near 700" C. The significance of this temperature is somewhat unclear since biotite formed from garnet and Opx during a later stage along the P-T-t path. However, as such, XFs of biotite was controlled by the composition of the preexisting garnet and Opx and the conditions during the biotite-producing event.…”

Section: Fe-mg Exchange Equilibriamentioning

confidence: 99%

Granulites and garnet–cordierite gneisses from Dronning Maud Land, Antarctica

Bucher-Nurminen

Ohta²

1993

Journal Metamorphic Geology

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The central sector of Muhlig-Hofmannfjellet (3"E/71°S) in western Dronning Maud Land (East Antarctic shield) is dominated by large intrusive bodies of predominantly orthopyroxene-bearing quartz syenites (charnockites). Metasedimentary rocks are rare; however, two distinct areas with banded gneiss-marblequartzite sequences of sedimentary origin were found during the Norwegian Antarctic Research Expedition NARE 1989/90. Cordierite-bearing metapelitic gneisses from two different localities contain the characteristic mineral assemblage: cordierite + garnet + biotite + K-feldspar + plagioclase + quartz f sillimanite f spinel. Thermobarometry indicates equilibration conditions of about 650" C and 4 kbar. Associated orthopyroxene-garnet granulites, on the other hand, revealed pressures of about 8 kbar and temperatures of 750" C. The earlier granulite facies metamorphism is not well preserved in the cordierite gneisses as a result of excess K-feldspar combined with interaction with an H,O-rich fluid phase, probably released by the cooling intrusives. These two features allowed the original high-grade K-feldspar + garnet assemblages to recrystallize as cordierite-biotite-sillimanite gneisses, completely re-equilibrating them. Phase relationships indicate that the younger metamorphic event occurred in the presence of a fluid phase that varied in composition between the lithologies.

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Section: Fe-mg Exchange Equilibriamentioning

confidence: 99%

Granulites and garnet–cordierite gneisses from Dronning Maud Land, Antarctica

Bucher-Nurminen

Ohta²

1993

Journal Metamorphic Geology

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“…At present nobody has succeeded in determining any value for intracrystalline component diffusion in iron-magnesian minerals under conditions of metamorphism (T < 750° C, P < 10 kbar) using direct experimental methods. On the other hand, numerous experimental investigations [e.g., 9,13,14,15,29,39] have shown that under hydrous conditions, the rates of mineral breakdown-crystallization reactions are undoubtedly higher than those of diffusion component exchange between minerals. Thus, it is evident that under metamorphic conditions, the former reactions should control the process of attaining equilibrium between mineral solid solutions.…”

Section: Discussionmentioning

confidence: 99%

Geological Thermometry and Barometry of Metamorphic Complexes: Central Kola Archean Granulite-Gneiss Region

Fonarev

Konilov

Graphchikov

1993

International Geology Review

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The paper distinguishes two complexes of high-grade metamorphic rocks in the central portion of the Kola Peninsula (Baltic Shield): 1) the Vyezhe Tundra complex, mainly enderbites and basic granulites with subordinate plagiogneisses, iron formation, and metapyroxenites, and 2) the Kola series (mainly plagiogneisses with subordinate iron formation and basic granulites). Textural and paragenetic relationships point toward multi-cyclic metamorphism in the region. Metamorphic temperature conditions were estimated using a consistent system of geothermometers and geobarometers. Temperature maxima (670, 565 and 500° C) were obtained, which correspond to different stages of metamorphism in the region. The results show that metamorphism in the two sequences occurred at similar temperatures; furthermore, no differences were found between unsheared and sheared rocks. The findings support the view that equilibration between minerals during metamorphism is controlled by breakdowncrystallization reactions. The obtained temperatures are not "blocking" temperatures, but mostly reflect discrete metamorphic episodes during the overall cooling history.

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“…Sengupta et al. (1990) established a geothermometer based on the Fe–Mg exchange reaction between orthopyroxene and biotite that was experimentally investigated by Fonarev & Konilov (1986). In the formulation of Sengupta et al.…”

Section: Discussionmentioning

confidence: 99%

“…The original formulation of Sengupta et al. (1990) and the corrected one provide identical temperatures at a pressure of 4.9 kbar, which is the experimental condition described by Fonarev & Konilov (1986). Temperature difference increases with increasing pressure difference from 4.9 kbar.…”

Section: Discussionmentioning

confidence: 99%

“…Sengupta et al (1990) established a geothermometer based on the Fe-Mg exchange reaction between orthopyroxene and biotite that was experimentally investigated by Fonarev & Konilov (1986). In the formulation of Sengupta et al (1990), the volume change for the reaction was incorrectly taken from dataset of Helgeson et al (1978) as -0.017 cal/bar.…”

Section: Peak Metamorphic Conditionsmentioning

confidence: 99%

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Orthopyroxene–cordierite mafic gneiss from the Nomamisaki metamorphic rocks, Southern Kyushu, Japan: Implication for western continuation of the Usuki–Yatsushiro Tectonic Line

2010

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We describe an orthopyroxene-cordierite mafic gneiss from the Nomamisaki metamorphic rocks in the Noma Peninsula, southern Kyushu, Japan. The mineral assemblage of the gneiss is orthopyroxene, cordierite, biotite, plagioclase, and ilmenite. Thermometry based on the Fe-Mg exchange reaction between orthopyroxene and biotite yields a peak metamorphic temperature of 680°C. The stability of cordierite relative to garnet, quartz, and sillimanite defines the upper limit of the peak metamorphic pressure as 4.4 kbar. These features indicate that the Nomamisaki metamorphic rocks underwent low-pressure high-temperature type metamorphism. Although a chronological problem still remains, the Nomamisaki metamorphic rocks can be regarded as a western continuation of the Higo Belt. The Usuki-Yatsushiro Tectonic Line, which delineates the southern border of the Higo Belt, is therefore located on the east of the Nomamisaki metamorphic rocks in southern Kyushu.

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Experimental study of Fe-Mg distribution between biotite and orthopyroxene at P=490 MPa

Cited by 29 publications

References 13 publications

Granulites and garnet–cordierite gneisses from Dronning Maud Land, Antarctica

Granulites and garnet–cordierite gneisses from Dronning Maud Land, Antarctica

Geological Thermometry and Barometry of Metamorphic Complexes: Central Kola Archean Granulite-Gneiss Region

Orthopyroxene–cordierite mafic gneiss from the Nomamisaki metamorphic rocks, Southern Kyushu, Japan: Implication for western continuation of the Usuki–Yatsushiro Tectonic Line

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