P-T modeling of kyanite and sillimanite paramorphs growth after andalusite in late Paleozoic Pyeongan Supergroup, South Korea

Implication for metamorphism during the Mesozoic tectonic evolution

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Abstract

Metasedimentary rocks of the Pyeongan Supergroup in the northeastern flank of the Taebaeksan Basin, South Korea, commonly contain two Al2SiO5 polymorphs (And+Ky and And+Sil), or more rarely, three coexisting Al2SiO5 polymorphs. Lower-grade rocks preserve chloritoid+andalusite±kyanite in muscovite-chlorite phyllite, and higher-grade rocks contain andalusite+sillimanite (±kyanite)+staurolite±garnet in mica schists. Kyanite and sillimanite occur as partial paramorphs after andalusite. Textural relations and relative metamorphic P-T conditions of the Al2SiO5-bearing mineral assemblages suggest a crystallization sequence of andalusite→kyanite→sillimanite, with the growth of staurolite and garnet in the kyanite and sillimanite stability fields. Metamorphic P-T conditions determined from geothermobarometry, compositional isopleths of chloritoid and garnet, and petrogenetic grids in the MnO-K2O-FeO-MgO-Al2O3-SiO2-H2O (MnKFMASH), MnKFMASH-T(TiO2)-O(Fe2O3), and Mn-N(Na2O)-C(CaO)-KFMASH systems could be divided into two regimes temporally: a clockwise path at lower temperature (LT)/medium pressure (MP) conditions, and higher temperature (HT)/low pressure (LP) conditions. The peak metamorphic P-T conditions for regional LT/MP metamorphism are ca. 5.0-6.0kbar at 550-580°C, and those for HT/LP metamorphism are ca. 3.0-4.8kbar and 590-610°C. Kyanite paramorphs after andalusite may result from a LT/MP clockwise P-T path associated with a rapid contractional deformation during the early to middle Mesozoic, and then sillimanite paramorphs after andalusite may have been formed by magmatic heating due to the later intrusion of leucocratic granite.

Original languageEnglish
Pages (from-to)269-286
Number of pages18
JournalLithos
Volume118
Issue number3-4
DOIs
Publication statusPublished - 2010 Aug 1

Fingerprint

andalusite
kyanite
sillimanite
Tectonics
tectonic evolution
P-T conditions
metamorphism
Paleozoic
chloritoid
modeling
Rocks
Garnets
low pressure
garnet
Polymorphism
Bearings (structural)
Temperature
phyllite
staurolite
metasedimentary rock

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

@article{3d3ed5758d91461e8b7625278fe3bf44,
title = "P-T modeling of kyanite and sillimanite paramorphs growth after andalusite in late Paleozoic Pyeongan Supergroup, South Korea: Implication for metamorphism during the Mesozoic tectonic evolution",
abstract = "Metasedimentary rocks of the Pyeongan Supergroup in the northeastern flank of the Taebaeksan Basin, South Korea, commonly contain two Al2SiO5 polymorphs (And+Ky and And+Sil), or more rarely, three coexisting Al2SiO5 polymorphs. Lower-grade rocks preserve chloritoid+andalusite±kyanite in muscovite-chlorite phyllite, and higher-grade rocks contain andalusite+sillimanite (±kyanite)+staurolite±garnet in mica schists. Kyanite and sillimanite occur as partial paramorphs after andalusite. Textural relations and relative metamorphic P-T conditions of the Al2SiO5-bearing mineral assemblages suggest a crystallization sequence of andalusite→kyanite→sillimanite, with the growth of staurolite and garnet in the kyanite and sillimanite stability fields. Metamorphic P-T conditions determined from geothermobarometry, compositional isopleths of chloritoid and garnet, and petrogenetic grids in the MnO-K2O-FeO-MgO-Al2O3-SiO2-H2O (MnKFMASH), MnKFMASH-T(TiO2)-O(Fe2O3), and Mn-N(Na2O)-C(CaO)-KFMASH systems could be divided into two regimes temporally: a clockwise path at lower temperature (LT)/medium pressure (MP) conditions, and higher temperature (HT)/low pressure (LP) conditions. The peak metamorphic P-T conditions for regional LT/MP metamorphism are ca. 5.0-6.0kbar at 550-580°C, and those for HT/LP metamorphism are ca. 3.0-4.8kbar and 590-610°C. Kyanite paramorphs after andalusite may result from a LT/MP clockwise P-T path associated with a rapid contractional deformation during the early to middle Mesozoic, and then sillimanite paramorphs after andalusite may have been formed by magmatic heating due to the later intrusion of leucocratic granite.",
keywords = "AlSiO polymorphs, LT/MP metamorphism, Paramorph, Pyeongan Supergroup",
author = "Hyeong-Soo Kim and Jin-Han Lee",
year = "2010",
month = "8",
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doi = "10.1016/j.lithos.2010.05.005",
language = "English",
volume = "118",
pages = "269--286",
journal = "Lithos",
issn = "0024-4937",
publisher = "Elsevier",
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T1 - P-T modeling of kyanite and sillimanite paramorphs growth after andalusite in late Paleozoic Pyeongan Supergroup, South Korea

T2 - Implication for metamorphism during the Mesozoic tectonic evolution

AU - Kim, Hyeong-Soo

AU - Lee, Jin-Han

PY - 2010/8/1

Y1 - 2010/8/1

N2 - Metasedimentary rocks of the Pyeongan Supergroup in the northeastern flank of the Taebaeksan Basin, South Korea, commonly contain two Al2SiO5 polymorphs (And+Ky and And+Sil), or more rarely, three coexisting Al2SiO5 polymorphs. Lower-grade rocks preserve chloritoid+andalusite±kyanite in muscovite-chlorite phyllite, and higher-grade rocks contain andalusite+sillimanite (±kyanite)+staurolite±garnet in mica schists. Kyanite and sillimanite occur as partial paramorphs after andalusite. Textural relations and relative metamorphic P-T conditions of the Al2SiO5-bearing mineral assemblages suggest a crystallization sequence of andalusite→kyanite→sillimanite, with the growth of staurolite and garnet in the kyanite and sillimanite stability fields. Metamorphic P-T conditions determined from geothermobarometry, compositional isopleths of chloritoid and garnet, and petrogenetic grids in the MnO-K2O-FeO-MgO-Al2O3-SiO2-H2O (MnKFMASH), MnKFMASH-T(TiO2)-O(Fe2O3), and Mn-N(Na2O)-C(CaO)-KFMASH systems could be divided into two regimes temporally: a clockwise path at lower temperature (LT)/medium pressure (MP) conditions, and higher temperature (HT)/low pressure (LP) conditions. The peak metamorphic P-T conditions for regional LT/MP metamorphism are ca. 5.0-6.0kbar at 550-580°C, and those for HT/LP metamorphism are ca. 3.0-4.8kbar and 590-610°C. Kyanite paramorphs after andalusite may result from a LT/MP clockwise P-T path associated with a rapid contractional deformation during the early to middle Mesozoic, and then sillimanite paramorphs after andalusite may have been formed by magmatic heating due to the later intrusion of leucocratic granite.

AB - Metasedimentary rocks of the Pyeongan Supergroup in the northeastern flank of the Taebaeksan Basin, South Korea, commonly contain two Al2SiO5 polymorphs (And+Ky and And+Sil), or more rarely, three coexisting Al2SiO5 polymorphs. Lower-grade rocks preserve chloritoid+andalusite±kyanite in muscovite-chlorite phyllite, and higher-grade rocks contain andalusite+sillimanite (±kyanite)+staurolite±garnet in mica schists. Kyanite and sillimanite occur as partial paramorphs after andalusite. Textural relations and relative metamorphic P-T conditions of the Al2SiO5-bearing mineral assemblages suggest a crystallization sequence of andalusite→kyanite→sillimanite, with the growth of staurolite and garnet in the kyanite and sillimanite stability fields. Metamorphic P-T conditions determined from geothermobarometry, compositional isopleths of chloritoid and garnet, and petrogenetic grids in the MnO-K2O-FeO-MgO-Al2O3-SiO2-H2O (MnKFMASH), MnKFMASH-T(TiO2)-O(Fe2O3), and Mn-N(Na2O)-C(CaO)-KFMASH systems could be divided into two regimes temporally: a clockwise path at lower temperature (LT)/medium pressure (MP) conditions, and higher temperature (HT)/low pressure (LP) conditions. The peak metamorphic P-T conditions for regional LT/MP metamorphism are ca. 5.0-6.0kbar at 550-580°C, and those for HT/LP metamorphism are ca. 3.0-4.8kbar and 590-610°C. Kyanite paramorphs after andalusite may result from a LT/MP clockwise P-T path associated with a rapid contractional deformation during the early to middle Mesozoic, and then sillimanite paramorphs after andalusite may have been formed by magmatic heating due to the later intrusion of leucocratic granite.

KW - AlSiO polymorphs

KW - LT/MP metamorphism

KW - Paramorph

KW - Pyeongan Supergroup

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DO - 10.1016/j.lithos.2010.05.005

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VL - 118

SP - 269

EP - 286

JO - Lithos

JF - Lithos

SN - 0024-4937

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