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Open AccessArticle

Mg-Phengite in Carbonate Rock Syngenetically Formed from Hydrothermal Fluid: Micro-Textural Evidence and Mineral Chemistry

1
Department of Earth System Sciences, Yonsei University, Seoul 03722, Korea
2
Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 34132, Korea
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 668; https://doi.org/10.3390/min10080668
Received: 30 June 2020 / Revised: 25 July 2020 / Accepted: 25 July 2020 / Published: 27 July 2020
(This article belongs to the Special Issue Microtexture Characterization of Rocks and Minerals)
Phengite series is a dioctahedral solid solution between two end-members of muscovite [K1[Al2]VI[Al1,Si3]IVO10(OH)2] and celadonite [K1[(Fe3+,Al)1,(Mg,Fe2+)1]VI[Si4]IVO10(OH)2], which have a hetero-valent substitution of AlVIAlIV ↔ (Mg, Fe)VISiIV. In this study, we report a hydrothermal-originated authigenic Mg-phengite-series mineral, which occurred as polycrystalline aggregates (Type 1), pore-fillings (Type 2) and well-crystallized lath form (Type 3) from the Haengmae Formation, a dolomite–pebble-bearing fine sand-sized dolostone, in South Korea. Based on micro-textural observation, three types of Mg-phengite are associated with crystalline dolomite, and are followed by calcite precipitation as pore-filling, indicating that these should be formed by the influx of a Mg-rich hydrothermal fluid after the deposition of some clastic sediments and before calcite-filling. The structural formula based on O10(OH)2 shows that the number of Mg atoms per formula unit (apfu) of Mg-phengite ranges from 0.00 to 0.70 with no Fe, which is relatively high, compared with the previously reported metamorphic phengites. In REEs mineral chemistry, the Mg-phengites are characterized by the enrichment of REEs and by the particular enrichment of LREEs in the polycrystalline aggregates of Mg-phengite. It strongly suggests that the Mg-phengite should be formed by the infiltration of the highly evolved Mg- and REEs-enriched hydrothermal fluid into the clastic sedimentary rock (Haengmae Formation) as a strata-bound form, syngenetically or during early diagenesis. View Full-Text
Keywords: Mg-phengite; muscovite–celadonite solid solution; Haengmae Formation; infiltration Mg-phengite; muscovite–celadonite solid solution; Haengmae Formation; infiltration
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MDPI and ACS Style

Park, C.; Kim, N.; Choi, S.-J.; Song, Y. Mg-Phengite in Carbonate Rock Syngenetically Formed from Hydrothermal Fluid: Micro-Textural Evidence and Mineral Chemistry. Minerals 2020, 10, 668. https://doi.org/10.3390/min10080668

AMA Style

Park C, Kim N, Choi S-J, Song Y. Mg-Phengite in Carbonate Rock Syngenetically Formed from Hydrothermal Fluid: Micro-Textural Evidence and Mineral Chemistry. Minerals. 2020; 10(8):668. https://doi.org/10.3390/min10080668

Chicago/Turabian Style

Park, Chaewon; Kim, Namsoo; Choi, Sung-Ja; Song, Yungoo. 2020. "Mg-Phengite in Carbonate Rock Syngenetically Formed from Hydrothermal Fluid: Micro-Textural Evidence and Mineral Chemistry" Minerals 10, no. 8: 668. https://doi.org/10.3390/min10080668

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