Stability of osumilite coexisting with spinel solid solution in metapelitic granulites at high oxygen fugacity

Das, Kaushik; Dasgupta, Somnath; Miura, Hiroyuki

doi:10.2138/am-2001-11-1211

Cited by 54 publications

(53 citation statements)

References 18 publications

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“…10 kbar and 900 1100°C, restricting Grt + Opx + Sil + Qz assemblages to higher pressures and allowing coexistence of Spr + Spl + Qz down to ca. 950°C at 8 9 kbar (Das et al, 2001;2003). Further experimental studies at high oxygen fugacities and with minor additional components will complement this work and enable phase relations involving spinel, sapphirine and other UHT minerals to be calculated in real rock systems.…”

Section: Pelites: Uht Mineral Assemblages In the Fmas And Near Fmas Smentioning

confidence: 85%

“…high Fe 3 + contents in Spr, Spl and Opx) and it is very necessary to constrain and evaluate such cases. Das et al (2001;2003) have demonstrated that at f o2 conditions near the HM buffer the KFMASH phase relations involving osumilite are very different to those depicted in Figure 2a. Figure 2b depicts the key high f o2 mineral reactions and assemblage fields determined by Das et al (2001;2003) on the same P T scale as Figure 2a.…”

Section: Pelites: Kfmash Complex Systems and The Pseudosection Apprmentioning

confidence: 95%

“…Das et al (2001;2003) have demonstrated that at f o2 conditions near the HM buffer the KFMASH phase relations involving osumilite are very different to those depicted in Figure 2a. Figure 2b depicts the key high f o2 mineral reactions and assemblage fields determined by Das et al (2001;2003) on the same P T scale as Figure 2a. Under high f o2 conditions the stability of osumilite is greatly extended down T at pressures of up to 8.5 kbar, and most critically the assemblage Os + Spl is stable instead of Grt + Crd + Kfs at pressures less than 8 8.5 kbar and from 850 to 1010°C.…”

Section: Pelites: Kfmash Complex Systems and The Pseudosection Apprmentioning

confidence: 95%

“…spinel ss , magnetite ss , hemoilmenite and corundum: Sandiford et al, 1987;Waters, 1991;Dasgupta et al, 1995) render its interpretation ambiguous. In recognition of this, recent experimental studies have sought to define the HT/UHT phase relations of spinel and spinel + quartz in oxidised systems, specifically KFe 3 + FMASH (Das et al 2001;2003). Under conditions near the hematite magnetite buffer Fe 3 + bearing spinel is stabilised with quartz to ca.…”

Section: Pelites: Uht Mineral Assemblages In the Fmas And Near Fmas Smentioning

confidence: 99%

“…Das et al, 2001: see Fig. 2b) but also modifies and in some instances reverses the distribution of Fe Mg between the minerals, changing the stable assemblages that can be formed (Hensen 1986;Powell and Sandiford 1988).…”

Section: Peak Temperatures Of Uht Metamorphism: the Importance Of Al mentioning

confidence: 99%

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Extending our understanding of Ultrahigh temperature crustal metamorphism

Harley

2004

Journal of Mineralogical and Petrological Sciences

171

114

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Rapid developments in the scope and quality of internally consistent thermodynamic data sets arising from the incorporation of new experimental data and solid solution models for minerals and melts involved in ultrahigh temperature (UHT) metamorphism now place petrologists in an excellent position to evaluate the detailed mineral assemblage evolutions of many UHT rocks and place these in quantitative frameworks using P T diagrams and pseudosection approaches. These developments will soon be enhanced by extension of the methods to systems at high f o2 , enabling a wider range of critical mineral assemblages to be considered and their UHT P T evolutions, at present largely qualitatively constrained, to be determined quantitatively. Cordierite provides a useful monitor of the role and composition of any fluids and melts attending UHT metamorphism at <1000ºC. Such fluids or melts remaining in communication with the mineral assemblages following UHT have a significant effect on preservation of the metamorphic record and may also strongly influence the ages recorded by geochronological systems, even to the extent of producing widespread post UHT metamorphic zircon. Modelling of UHT metamorphism and P T paths, whether IBC, ITD or hybrid ITD IBC, in terms of specific and testable tectonic settings and processes is still problematic, with those models that can successfully duplicate the extraordinary temperatures attained in some UHT terrains generally being geologically unreasonable. Successful modelling of the thermal conditions and evolution of UHT terrains, constrained by quantitative P T t paths, is an important objective for future research that will inform our understanding of this intriguing aspect of the behaviour of the Earth system.

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Section: Pelites: Uht Mineral Assemblages In the Fmas And Near Fmas Smentioning

confidence: 85%

Section: Pelites: Kfmash Complex Systems and The Pseudosection Apprmentioning

confidence: 95%

Section: Pelites: Kfmash Complex Systems and The Pseudosection Apprmentioning

confidence: 95%

Section: Pelites: Uht Mineral Assemblages In the Fmas And Near Fmas Smentioning

confidence: 99%

Section: Peak Temperatures Of Uht Metamorphism: the Importance Of Al mentioning

confidence: 99%

See 3 more Smart Citations

Extending our understanding of Ultrahigh temperature crustal metamorphism

Harley

2004

Journal of Mineralogical and Petrological Sciences

171

114

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Multiple tectonometamorphic imprints in the lower crust: first evidence ofca. 950 Ma (zircon U‐Pb SHRIMP) compressional reworking of UHT aluminous granulites from the Eastern Ghats Belt, India

et al. 2011

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Integrated structural, petrological and geochronological study on a suite of granulites from the central part of the Eastern Ghats Belt (EGB), India unveils polyphase tectonothermal evolution. We document (a) M 1 ultrahigh temperature (UHT) metamorphism ($10008C at 6.5-8.5 kbar) on an anticlockwise P-T trajectory simultaneously with early deformations D 1 -D 2 involving partial melting, (b) cooling down to $ 8008C, 6 kbar that produced a variety of coronae/symplectites (M 1R ), (c) an unrelated compressional orogeny (D 3 ) that produced deep crustal shears and mylonitic foliation (S 3m ) at low angles to D 1 -D 2 structures and was associated with slight loading, and possible partial melt extraction under granulite facies condition (M 2 $7 kbar, 8508C), and (d) localized retrogression (M 3 ) in the presence of melt accompanying D 4 deformation. This is the first record of the prograde P-T path of the superimposed granulite facies metamorphism in the EGB. U-Pb SHRIMP data of zircon preserves an inherited grain domain of ca. 1700 Ma ( 207 Pb age) that traces back the history of EGB with a lineage of the Mesoproterozoic supercontinent, Columbia. The UHT metamorphosed (peak M 1 at ca. 1000 Ma) and subsequently cooled crustal segment (M 1R ) was subjected to strong tectonothermal reworking (M 2 ) along a clockwise P-T path at 953 þ 6 Ma (concordia age) that partially exhumed the rocks to mid-crustal levels. A later fluid-induced retrogressive event vis-à-vis melt crystallization occurred at ca. 900 Ma ( KEY WORDS deep crustal reworking; Eastern Ghats Belt; India; UHT aluminous granulites; zircon U-Pb SHRIMP ages Supporting information (supplementary tables S2-S6) may be found in the online version of this paper.

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U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

Okazaki,

Das,

Chattopadhyay

et al. 2023

Geological Journal

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The gneisses of the Sarwar‐Junia Fault Zone (SJFZ), in the Mangalwar Gneissic Complex, a part of the Banded Gneissic Complex (BGC‐II) of northwest India recorded two phases of metamorphism. The pelitic gneiss from SJFZ mainly consists of biotite, sillimanite, garnet, quartz, K‐feldspar and plagioclase. On the other hand, the granitic gneiss from SJFZ mainly consists of quartz, plagioclase, K‐feldspar and biotite. From zircon and monazite geochronology, the protolith of pelitic gneiss was deposited on basement granitic gneiss and the metamorphism occurred at ca. 950 Ma affecting both the granitic gneiss and the pelitic gneiss. Estimation of the P‐T conditions of metamorphism and pseudosection modelling of the pelitic gneiss revealed that the peak stage metamorphic condition of M2 culminated at ~850°C and ~7 kbar pressure followed by a near‐isobaric cooling. Large garnet porphyroblasts in contact with retrograde biotite shows Fe‐Mg resetting close to the core region, which implies a slow cooling. Therefore, the possible exhumation during the subduction‐collision tectonics was very slow, if not completely ceased, at ca. 950 Ma. The shared tectonothermal history of the Sandmata Metamorphic Complex and Mangalwar Metamorphic Complex in the BGC‐II is now evident from the present study of the SJFZ, and confirms the presence of Grenvillian‐aged tectonothermal events in the eastern part of BGC‐II. The abovementioned near‐isobarically cooled and hydrated crust of the SJFZ records subsequent event(s) of shallow crustal brittle faulting as evident by the presence of pseudotachylyte veins and cataclastic fabric observed in the studied gneisses. Brittle faulting possibly occurred between ca. 905 Ma and ca. 750 Ma, as interpreted from the present geochronological data.

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Stability of osumilite coexisting with spinel solid solution in metapelitic granulites at high oxygen fugacity

Cited by 54 publications

References 18 publications

Extending our understanding of Ultrahigh temperature crustal metamorphism

Extending our understanding of Ultrahigh temperature crustal metamorphism

Multiple tectonometamorphic imprints in the lower crust: first evidence ofca. 950 Ma (zircon U‐Pb SHRIMP) compressional reworking of UHT aluminous granulites from the Eastern Ghats Belt, India

U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

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