First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products
A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron m...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Das, Enakshi [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2020transfer abstract |
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| Übergeordnetes Werk: |
Enthalten in: Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation - Zhu, Guo ELSEVIER, 2021, an international journal of mineralogy, petrology, and geochemistry, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:352 ; year:2020 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.lithos.2019.105315 |
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ELV049147064 |
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| 245 | 1 | 0 | |a First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products |
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| 520 | |a A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. | ||
| 520 | |a A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. | ||
| 700 | 1 | |a Karmakar, Shreya |4 oth | |
| 700 | 1 | |a Chatterjee, Somdipta |4 oth | |
| 700 | 1 | |a Karmakar, Subrata |4 oth | |
| 700 | 1 | |a Sengupta, Pulak |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Zhu, Guo ELSEVIER |t Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation |d 2021 |d an international journal of mineralogy, petrology, and geochemistry |g Amsterdam [u.a.] |w (DE-627)ELV006642446 |
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10.1016/j.lithos.2019.105315 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000899.pica (DE-627)ELV049147064 (ELSEVIER)S0024-4937(19)30475-X DE-627 ger DE-627 rakwb eng 530 VZ 58.19 bkl 33.09 bkl 52.78 bkl Das, Enakshi verfasserin aut First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. Karmakar, Shreya oth Chatterjee, Somdipta oth Karmakar, Subrata oth Sengupta, Pulak oth Enthalten in Elsevier Science Zhu, Guo ELSEVIER Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation 2021 an international journal of mineralogy, petrology, and geochemistry Amsterdam [u.a.] (DE-627)ELV006642446 volume:352 year:2020 pages:0 https://doi.org/10.1016/j.lithos.2019.105315 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 58.19 Verfahrenstechnik: Sonstiges VZ 33.09 Physik unter besonderen Bedingungen VZ 52.78 Oberflächentechnik Wärmebehandlung VZ AR 352 2020 0 |
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10.1016/j.lithos.2019.105315 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000899.pica (DE-627)ELV049147064 (ELSEVIER)S0024-4937(19)30475-X DE-627 ger DE-627 rakwb eng 530 VZ 58.19 bkl 33.09 bkl 52.78 bkl Das, Enakshi verfasserin aut First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. Karmakar, Shreya oth Chatterjee, Somdipta oth Karmakar, Subrata oth Sengupta, Pulak oth Enthalten in Elsevier Science Zhu, Guo ELSEVIER Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation 2021 an international journal of mineralogy, petrology, and geochemistry Amsterdam [u.a.] (DE-627)ELV006642446 volume:352 year:2020 pages:0 https://doi.org/10.1016/j.lithos.2019.105315 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 58.19 Verfahrenstechnik: Sonstiges VZ 33.09 Physik unter besonderen Bedingungen VZ 52.78 Oberflächentechnik Wärmebehandlung VZ AR 352 2020 0 |
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10.1016/j.lithos.2019.105315 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000899.pica (DE-627)ELV049147064 (ELSEVIER)S0024-4937(19)30475-X DE-627 ger DE-627 rakwb eng 530 VZ 58.19 bkl 33.09 bkl 52.78 bkl Das, Enakshi verfasserin aut First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. Karmakar, Shreya oth Chatterjee, Somdipta oth Karmakar, Subrata oth Sengupta, Pulak oth Enthalten in Elsevier Science Zhu, Guo ELSEVIER Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation 2021 an international journal of mineralogy, petrology, and geochemistry Amsterdam [u.a.] (DE-627)ELV006642446 volume:352 year:2020 pages:0 https://doi.org/10.1016/j.lithos.2019.105315 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 58.19 Verfahrenstechnik: Sonstiges VZ 33.09 Physik unter besonderen Bedingungen VZ 52.78 Oberflächentechnik Wärmebehandlung VZ AR 352 2020 0 |
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10.1016/j.lithos.2019.105315 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000899.pica (DE-627)ELV049147064 (ELSEVIER)S0024-4937(19)30475-X DE-627 ger DE-627 rakwb eng 530 VZ 58.19 bkl 33.09 bkl 52.78 bkl Das, Enakshi verfasserin aut First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. Karmakar, Shreya oth Chatterjee, Somdipta oth Karmakar, Subrata oth Sengupta, Pulak oth Enthalten in Elsevier Science Zhu, Guo ELSEVIER Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation 2021 an international journal of mineralogy, petrology, and geochemistry Amsterdam [u.a.] (DE-627)ELV006642446 volume:352 year:2020 pages:0 https://doi.org/10.1016/j.lithos.2019.105315 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 58.19 Verfahrenstechnik: Sonstiges VZ 33.09 Physik unter besonderen Bedingungen VZ 52.78 Oberflächentechnik Wärmebehandlung VZ AR 352 2020 0 |
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10.1016/j.lithos.2019.105315 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000899.pica (DE-627)ELV049147064 (ELSEVIER)S0024-4937(19)30475-X DE-627 ger DE-627 rakwb eng 530 VZ 58.19 bkl 33.09 bkl 52.78 bkl Das, Enakshi verfasserin aut First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. Karmakar, Shreya oth Chatterjee, Somdipta oth Karmakar, Subrata oth Sengupta, Pulak oth Enthalten in Elsevier Science Zhu, Guo ELSEVIER Mechanism for anisotropic ejection of atoms from fcc (100) metal surface by low-energy argon ion bombardment: Molecular dynamics simulation 2021 an international journal of mineralogy, petrology, and geochemistry Amsterdam [u.a.] (DE-627)ELV006642446 volume:352 year:2020 pages:0 https://doi.org/10.1016/j.lithos.2019.105315 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 58.19 Verfahrenstechnik: Sonstiges VZ 33.09 Physik unter besonderen Bedingungen VZ 52.78 Oberflächentechnik Wärmebehandlung VZ AR 352 2020 0 |
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First comprehensive characterization of osumilite from India ( Eastern Ghats Province): Physicochemical characteristics, stability of the mineral and its breakdown products |
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A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. |
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A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. |
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A rare occurrence of osumilite has been reported from a metapelite from parts of the Eastern Ghats Province, India. Incidentally, this is the first report of osumilite along with its composition and textural description from any Indian rock. The presence of osumilite has been confirmed by electron microscopy (BSE images), electron microprobe analyses (and X-ray intensity maps) as well as Raman spectroscopy. In the studied sample, osumilite occurs as rare anhedral relicts (~300–350 μm) that are surrounded by a variety of extremely fine-grained symplectitic intergrowths namely cordierite + K-feldspar, cordierite + K-feldspar + orthopyroxene and cordierite + K-feldspar + orthopyroxene + quartz. The symplectites partially to completely pseudomorph the early formed osumilite grains. An isochemical pressure-temperature phase diagram has been calculated in the Na2O-K2O-FeO-MgO-Al2O3-SiO2-H2O system in order to model the breakdown of osumilite and formation of such symplectitic mineral assemblages, using the average micro bulk compositions calculated with the XMapTools software. The calculated P-T phase diagram suggests that osumilite was formed during ultra-high temperature metamorphism (at P~8.5 kbar and T~1110°C) in an Mg-Al-rich pelitic assemblage and subsequently broke down to produce the symplectitic mineral assemblages during isobaric cooling. |
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