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P-T modeling of margarite + anorthite-bearing Al-rich metapelites in the Taebaeksan basin, South Korea: implications for accretion-related metamorphism during the Late Permian-Triassic orogeny

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Abstract

Greenschist-facies Al-rich metapelites of the Pyeongan Supergroup in the eastern part of the Taebaeksan Basin, South Korea, contain unusual mineral assemblages, including the associations Mrg + Cld + Ms ± Chl ± Cal, An + Mrg + Ms, and An + Ms ± Grt ± St (all rocks contain Qtz). The XMrg [Ca/(Ca + Na + K)] and XPa [Na/(Ca + Na + K)] values of margarite range from 0.12 to 0.92 and from 0.10 to 0.28, respectively. High-Ca plagioclase porphyroblasts are slightly zoned, from An85 in the core to An98 in the rim. The Mrg + Cld-bearing assemblage yields P-T conditions of ca. 450–480 °C, 4.0–5.0 kbar based on the intersection of isopleths of Fe/(Fe + Mg) of chloritoid and XPa of margarite in the MnO-Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O (MnNCKFMASH) system. The anorthite-bearing mineral assemblages yield P-T conditions of ca. 480–520 °C, 3.8–4.4 kbar, and the An contents of plagioclase increased during decompression rather than during heating, based on isopleths of An content and the modal proportion of plagioclase. Phase relations in \(T - X_{CO_2 } \) pseudosections at 4 kbar in the CASH-CO2 system indicate that anorthite in the Al-rich metapelites grew during the consumption of margarite at \(X_{CO_2 } \) values of ca. 0.2–0.5 during sub-isothermal decompression at temperatures of 480–500 °C. Consequently, the overall P-T path for the formation of chloritoid, margarite and anorthite is characterized by relatively rapid compressional heating up to 480 °C at 5.0 kbar (geothermal gradient of 27–30 °C/km), followed by sub-isothermal retrograde decompression. This clockwise P-T path in the eastern part of the Taebaeksan Basin reflects the effects of the Late Permian-Triassic Songrim orogeny, which probably occurred at an accretionary forearc-related active continental margin.

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  1. Department of Earth Sciences Education, Kyungpook National University, Daegu, 702-701, Republic of Korea

    Hyeong Soo Kim

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Kim, H.S. P-T modeling of margarite + anorthite-bearing Al-rich metapelites in the Taebaeksan basin, South Korea: implications for accretion-related metamorphism during the Late Permian-Triassic orogeny. Geosci J 16, 207–227 (2012). https://doi.org/10.1007/s12303-012-0024-5

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