Pressure–temperature–time path of a metapelite from Mefjell, Sør Rondane Mountains, East Antarctica

Tsubokawa, Yumiko; Ishikawa, Masahiro; Kawakami, Tetsuo; Hokada, Tomokazu; Satish‐Kumar, M.; Tsuchiya, Noriyoshi; Grantham, G.H.

doi:10.2465/jmps.160919

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…This is the first outcrop evidence of the UHT metamorphism and UHT partial melting from the SRM. Peak P-T conditions from the SRM have been estimated in several areas and all of them showed temperature below the UHT condition (Adachi et al, 2013;Baba et al, 2013;Grantham et al, 2013;Higashino et al, 2013a;Kawakami et al, 2017;Tsubokawa et al, 2017). However, Higashino et al (2013a) estimated the peak metamorphic P-T conditions in Balchenfjella to be ~850 ± 50 °C, 1.1 ± 0.2 GPa, based on conventional Grt-Bt geothermometer and GASP geobarometer.…”

Section: Discussionmentioning

confidence: 99%

“…Grantham et al (2013) proposes a top-to-the-southwest mega-nappe complex involving collision between Northern and Southern Gondwana during the Kuunga Orogeny in eastern SRM. Although Osanai et al (2013) proposed the tectonic model in which the SRM is divided into the NE-and the SW-terranes by the Main Tectonic Boundary, various P-T paths and geochronological data recently reported from the entire SRM suggest that the tectonic model in the SRM needs to be re-evaluated (e.g., Kawakami et al, 2017;Tsubokawa et al, 2017;Ruppel et al, 2021).…”

Section: Geological Settingmentioning

confidence: 99%

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Ultrahigh–temperature metamorphism and melt inclusions from the Sør Rondane Mountains, East Antarctica

Higashino

Kawakami

2022

Journal of Mineralogical and Petrological Sciences

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This paper reports the first outcrop occurrence of an ultrahigh-temperature (UHT) metamorphic rock from the Sør Rondane Mountains (SRM), East Antarctica. A pelitic gneiss from Balchenfjella, eastern SRM, contains mesoperthite that gave UHT condition (>900 °C) by ternary feldspar thermometry. The UHT mesoperthite is present both in the matrix and as an inclusion in garnet. The garnet also has nanogranitoid inclusions next to the mesoperthite, which are interpreted to be an UHT melt. The re-integrated nanogranitoid composition is plotted in the primary phase region of quartz and classified as granite. Even crystallized nanogranitoids can provide appropriate original melt composition in the An-Ab-Or and Qz-Ab-Or spaces, whereas Mg concentration is enriched due to local retrograde Fe-Mg exchange reaction between the nanogranitoid inclusions and the host garnet. Although metamorphic rocks in the SRM are highly retrogressed, this study revealed that the microstructural evidence of UHT condition is partially preserved. Further investigation of timing and areal extent of UHT metamorphism helps us to understand the tectonic model of the SRM.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Ultrahigh–temperature metamorphism and melt inclusions from the Sør Rondane Mountains, East Antarctica

Higashino

Kawakami

2022

Journal of Mineralogical and Petrological Sciences

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“…Although Osanai et al (2013) proposed the MTB formation at ca. 650-600 Ma, various P-T-t paths and geochronological data recently reported from the entire SRM suggest that the tectonic model for the SRM formation needs to be re-evaluated (e.g., Kawakami et al, 2017;Tsubokawa et al, 2017;Ruppel et al, 2021;Hokada et al, 2022;Higashino et al, 2023).…”

Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

Multiple post-peak metamorphic fluid infiltrations in southern Perlebandet, Sør Rondane Mountains, East Antarctica

Higashino

Kawakami

Adachi

et al. 2023

Journal of Mineralogical and Petrological Sciences

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This paper reports multiple fluid infiltration events during retrograde metamorphism in the Sør Rondane Mountains, East Antarctica. Pelitic gneisses from southern part of Perlebandet have cordierite-biotite intergrowth rimming garnet, implying that garnet breakdown occurred by fluid infiltration. Using the Raman peak of CO2 in cordierite and Cl-bearing composition in biotite, this study revealed that the cordierite-biotite intergrowth was formed in equilibrium with one-phase CO2-Cl-H2O fluid. The intergrowth texture is cut by thin selvages composed of Cl-bearing biotite, suggesting Cl-bearing fluid infiltration. Since andalusite is exclusively observed in the selvage, near isobaric cooling path is presumed for the pressure-temperature (P-T) path of these post-peak fluid-related reactions. The inconsistence with counter-clockwise P-T path reported from northern Perlebandet is probably due to the granodiorite/leucocratic granite bodies beneath the studied metamorphic rocks. In order to understand the tectonic evolution at the final stage of Gondwana amalgamation, therefore, effect of hidden igneous rocks needs to be taken into consideration.

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Zeta potentials of the rare earth element fluorcarbonate minerals focusing on bastnäsite and parisite

Owens

Nash

Hadler

et al. 2018

Advances in Colloid and Interface Science

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Rare earth elements (REE) are critical to a wide range of technologies ranging from mobile phones to wind turbines. Processing and extraction of REE minerals from ore bodies is, however, both challenging and relatively poorly understood, as the majority of deposits contain only limited enrichment of REEs. An improved understanding of the surface properties of the minerals is important in informing and optimising their processing, in particular for separation by froth flotation. The measurement of zeta potential can be used to extract information regarding the electrical double layer, and hence surface properties of these minerals. There are over 34 REE fluorcarbonate minerals currently identified, however bastnäsite, synchysite and parisite are of most economic importance. Bastnäsite-(Ce), the most common REE fluorcarbonate, supplies over 50% of the world's REE. Previous studies of bastnäsite have showed a wide range of surface behaviour, with the iso-electric point (IEP), being measured between pH values of 4.6 and 9.3. In contrast, no values of IEP have been reported for parisite or synchysite. In this work, we review previous studies of the zeta potentials of bastnäsite to investigate the effects of different methodologies and sample preparation. In addition, measurements of zeta potentials of parisite under water, collector and supernatant conditions were conducted, the first to be reported. These results showed an iso-electric point for parisite of 5.6 under water, with a shift to a more negative zeta potential with both collector (hydroxamic and fatty acids) and supernatant conditions. The IEP with collectors and supernatant was <3.5. As zeta potential measurements in the presence of reagents and supernatants are the most rigorous way of determining the efficiency of a flotation reagent, the agreement between parisite zeta potentials obtained here and previous work on bastnäsite suggests that parisite may be processed using similar reagent schemes to bastnäsite. This is important for future processing of REE deposits, comprising of more complex REE mineralogy.

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Pressure–temperature–time path of a metapelite from Mefjell, Sør Rondane Mountains, East Antarctica

Cited by 6 publications

References 17 publications

Ultrahigh–temperature metamorphism and melt inclusions from the Sør Rondane Mountains, East Antarctica

Ultrahigh–temperature metamorphism and melt inclusions from the Sør Rondane Mountains, East Antarctica

Multiple post-peak metamorphic fluid infiltrations in southern Perlebandet, Sør Rondane Mountains, East Antarctica

Zeta potentials of the rare earth element fluorcarbonate minerals focusing on bastnäsite and parisite

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