P–T-Fluid evolution and graphite deposition during retrograde metamorphism in Ribeira Fold Belt, SE Brazil: Oxygen fugacity, fluid inclusions and C–O–H isotopic evidence

Santos, Telmo Bento dos; Munhá, José; Tassinari, Colombo Celso Gaeta; Noronha, Fernando; Guedes, Alexandra; Fonseca, Paulo E.; Neto, Coriolano de Marins e Dias; Dória, A.

doi:10.1016/j.jsames.2010.02.002

Cited by 12 publications

(5 citation statements)

References 72 publications

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“…This value is much higher than the Fe 3+ /Fe T value (0.40) determined by Fe 2+ titration. A potential explanation for this discrepancy could be that f O 2 decreased significantly during exhumation (Bento dos Santos et al., ), which is consistent with reports of subordinate graphite deposition in the Khondalite Belt as f O 2 decreased (e.g. Yang, ).…”

Section: Phase Equilibrium Modellingsupporting

confidence: 67%

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Ultrahigh‐temperature metamorphism in the Tuguiwula area, Khondalite Belt, North China Craton

Wei

2018

Journal Metamorphic Geology

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In this study, sapphirine-bearing granulites and sapphirine-absent garnet-sillimanite gneisses from the Tuguiwula area in the eastern segment of the Khondalite Belt, North China Craton (NCC) are interpreted to show a P-T evolution involving cooling at pressures of 8-9 kbar from >960°C to the solidus (~820°C) and late subsolidus decompression. This interpretation is based on the sequence of mineral appearance and thermodynamic modelling of phase equilibria. Sapphirine is observed to coexist with spinel within the peak assemblages. This observation conflicts with the traditional view that spinel generally appears prior to sapphirine and thus indicates pre-T max compression. For ultrahigh-temperature (UHT) metapelites at Tuguiwula, a clockwise P-T path may be more likely, which would be consistent with the clockwise P-T evolution of the extensive "normal" granulites (T max <900°C) and UHT granulites at other localities in the eastern segment of the Khondalite Belt. At Tuguiwula, for UHT metapelites with low bulk-rock Mg/ (Mg+Fe T ), the oxidation state/Fe 3+ content is interpreted to be a significant factor in controlling the mineral assemblages. We find that these compositions tend to contain sapphirine under oxidized conditions but spinel (without sapphirine) under reduced conditions. This difference may account for the simultaneous presence of both sapphirine-bearing UHT granulites and sapphirine-absent garnet-sillimanite UHT gneisses at Tuguiwula. LA-ICP-MS U-Pb dating of metamorphic zircon in the UHT metapelites yields mean 207 Pb/ 206 Pb ages of c. 1.92 Ga (two samples), which are interpreted to record the timing of cooling of the UHT rocks to the solidus. The UHT metamorphism is interpreted to have been generated by mantle upwelling and emplacement of mafic magmas within a post-orogenic setting.

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Section: Phase Equilibrium Modellingsupporting

confidence: 67%

“…Korhonen et al., ) and the effects of fluids that may cause changes in oxygen fugacity during exhumation (e.g. Bento dos Santos et al., ; Cao, Song, Niu, Jung, & Jin, ).…”

Section: Phase Equilibrium Modellingmentioning

confidence: 99%

Ultrahigh‐temperature metamorphism in the Tuguiwula area, Khondalite Belt, North China Craton

Wei

2018

Journal Metamorphic Geology

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“…Rey et al 2009;Horton & Leech 2013), late-orogenic gravitational/orogenic collapse (e.g. Martínez Catalan et al 2007;2011c;, buoyancy-driven flow (e.g. Teyssier & Whitney 2002;Whitney et al 2004) and channel flow (e.g.…”

Section: Discussionmentioning

confidence: 99%

Exhumation of an anatectic complex by channel flow and extrusion tectonics: structural and metamorphic evidence from the Porto–Viseu Metamorphic Belt, Central-Iberian Zone

Santos

Rodrigues

Castro

et al. 2021

Int J Earth Sci (Geol Rundsch)

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Korhonen et al, ) and the effects of fluids that may cause changes in oxygen fugacity during exhumation (e.g. Bento dos Santos et al, ; Cao, Song, Niu, Jung, & Jin, ). The bulk‐rock compositions used for the pseudosection calculation are presented in Table .…”

Section: Metamorphic P–t Conditions and Pathsmentioning

confidence: 99%

MetamorphicP‒Tpaths and Zircon U–Pb ages of Archean ultra‐high temperature paragneisses from the Qian’an gneiss dome, East Hebei terrane, North China Craton

Liu

Wei

2020

Journal Metamorphic Geology

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The East Hebei terrane of North China Craton is characterized by the dome-and-keel structure, a common feature in most Archean cratons, where supracrustal rocks of granulite facies commonly occur as enclaves or rafts in tonalite-trondhjemite-granodiorite (TTG) gneisses. The metamorphic P-T paths of the granulites are significant for addressing the Archean tectonic regimes. Two types of granulite facies paragneiss with pelitic and greywacke compositions from the western margin of Qian'an gneiss dome are documented for their petrography, mineral chemistry, phase equilibria modelling using thermocalc, and zircon dating. Anticlockwise P-T paths involving the pre-peak pressure increase to the ultra-high temperature peak conditions and post-peak cooling and decompression processes were recognized. The pre-peak pressure increase process was constrained for a pelitic granulite mainly based on the spinel and cordierite inclusions in garnet and rutile corona around ilmenite, where the transition from spinel to garnet is modelled at 6-7 kbar at a fixed T = 1,000°C.For greywacke granulite, the pre-peak pressure increase evolution can be ascertained from the textural relation that orthopyroxene is surrounded by garnet, and the outwards increasing grossular (from 0.03 to 0.05) in the core of the atoll-like garnet (Grt-A), to occur from ~7 kbar at ~1,000°C. The peak P-T conditions for pelitic granulite are roughly limited to 7-11 kbar/890-1,050°C on the basis of the stability of the inferred peak assemblage involving garnet, perthite, sillimanite, rutile/ilmenite, and quartz. The peak P-T condition for greywacke granulite can be well constrained as 9-10 kbar/>1,000°C on the basis of the maximum grossular content (X Grs = 0.045-0.050) in the core of subhedral garnet (Grt-B) and the mantle of Grt-A together with an average re-integrated anorthite content (X An = 0.07) in K-feldspar.The peak temperature condition is consistent with the ternary feldspar thermometer results mostly of 950-1,020°C for antiperthite and perthite in greywacke granulite, and in accordance with the development of oriented needle-like exsolution of Ti±Fe oxides in garnet from pelitic granulite. The post-peak cooling and decompression process was consistent with the decreasing X Grs in the mantle of Grt-A and core of Grt-B in greywacke sample, and the final-stage cooling conditions can be well constrained from the stability of final assemblages marked by the later growth of biotite, as 8-9 kbar/820-880°C for pelitic granulite and 6-9 kbar/840-890°C for greywacke 330 | LIU and WEI the final pulse of the Neoarchean magmatic activity of TTGs that ranges from c. 2.56 to c. 2.48 Ga with a peak at c. 2.52 Ga. Combining the development of dome-andkeel structures, the penecontemporaneity between the metamorphism of supracrustal rocks and TTG magmatic activity, and also the unique anticlockwise P-T paths, we prefer a vertical sagduction regime to interpret the tectonic evolution of the East Hebei terrane, which may be also significant for other Archean cratons. K E Y...

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P–T-Fluid evolution and graphite deposition during retrograde metamorphism in Ribeira Fold Belt, SE Brazil: Oxygen fugacity, fluid inclusions and C–O–H isotopic evidence

Cited by 12 publications

References 72 publications

Ultrahigh‐temperature metamorphism in the Tuguiwula area, Khondalite Belt, North China Craton

Ultrahigh‐temperature metamorphism in the Tuguiwula area, Khondalite Belt, North China Craton

Exhumation of an anatectic complex by channel flow and extrusion tectonics: structural and metamorphic evidence from the Porto–Viseu Metamorphic Belt, Central-Iberian Zone

MetamorphicP‒Tpaths and Zircon U–Pb ages of Archean ultra‐high temperature paragneisses from the Qian’an gneiss dome, East Hebei terrane, North China Craton

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