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Fluid evolution during the development of scapolite-bearing assemblages in striped calcsilicate layers between metapelites and metacarbonates.

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Title: Fluid evolution during the development of scapolite-bearing assemblages in striped calcsilicate layers between metapelites and metacarbonates.
Authors: Lee, Jeongmin1 (AUTHOR), Kim, Hyeong Soo1 (AUTHOR) haskim2@korea.ac.kr
Source: Contributions to Mineralogy & Petrology. Jun2026, Vol. 181 Issue 6, p1-19. 19p.
Subject Terms: *Metasomatism, *Fluids, *Metamorphism (Geology), *Silicate minerals, *Metamorphic rocks
Geographic Terms: Kyŏnggi-do (Korea), South Korea
Abstract: Stratified calcsilicate layers intercalated with metapelites and metacarbonates in the northwestern Gyeonggi Massif, Korea, preserve a two-stage metamorphic and metasomatic history that records the evolution of H2O–CO2–NaCl (± HCl) fluids in a lithologically heterogeneous crustal environment. Scapolite-bearing assemblages in garnet-bearing and garnet-free layers display distinct microtextural and mineral-chemical features that reflect contrasting fluid-buffering capacities during medium pressure regional metamorphism. During peak metamorphism, both lithologies acted as locally internally buffered systems, allowing scapolite-I (XCl < 0.1) to form in response to micro-scale variations in XCO2. Clinozoisite + plagioclase (oligoclase to andesine) inclusions within scapolite-I, ferro-pargasite inclusions in clinopyroxene, and pyrite enclosed in scapolite-I indicate alternating CO2-consuming and CO2-producing micro-domains under relatively low fO2, generating centimeter- to meter-scale heterogeneity in XCO2. During retrograde metamorphism, the system evolved into a locally infiltration-dominated regime. Garnet-free layers selectively incorporated externally derived saline fluids, forming scapolite-II (XCl = 0.1–0.3), albitic plagioclase, and Ca-amphibole, recorded by scapolite-II overgrowths on scapolite-I and albitic rims on plagioclase (oligoclase to andesine). In contrast, garnet-bearing layers experienced anorthitization and destabilization of scapolite-I and clinopyroxene, releasing Na-rich and metal–chloride-bearing fluids. These contrasting metasomatic responses established a lithologic-scale Cl-circulation loop linked to variations in XCO2 and in the activities of Na+, Ca2+, and Cl–, explaining the selective stabilization of scapolite-II in garnet-free layers and oscillatory zoning in plagioclase. Mineralogical and geochemical evidence suggests that the saline fluids may have derived from deeply sourced metamorphic brines and/or NaCl (± HCl)-bearing hydrothermal systems associated with post-collisional alkali magmatism. Scapolite–plagioclase mineral pairs thus provide robust constraints on fluid composition and metasomatic processes during regional metamorphism and subsequent exhumation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194698450
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Fluid evolution during the development of scapolite-bearing assemblages in striped calcsilicate layers between metapelites and metacarbonates.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Contributions+to+Mineralogy+%26+Petrology%22&quot;&gt;Contributions to Mineralogy &amp; Petrology&lt;/searchLink&gt;. Jun2026, Vol. 181 Issue 6, p1-19. 19p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Stratified calcsilicate layers intercalated with metapelites and metacarbonates in the northwestern Gyeonggi Massif, Korea, preserve a two-stage metamorphic and metasomatic history that records the evolution of H2O–CO2–NaCl (&#177; HCl) fluids in a lithologically heterogeneous crustal environment. Scapolite-bearing assemblages in garnet-bearing and garnet-free layers display distinct microtextural and mineral-chemical features that reflect contrasting fluid-buffering capacities during medium pressure regional metamorphism. During peak metamorphism, both lithologies acted as locally internally buffered systems, allowing scapolite-I (XCl &lt; 0.1) to form in response to micro-scale variations in XCO2. Clinozoisite + plagioclase (oligoclase to andesine) inclusions within scapolite-I, ferro-pargasite inclusions in clinopyroxene, and pyrite enclosed in scapolite-I indicate alternating CO2-consuming and CO2-producing micro-domains under relatively low fO2, generating centimeter- to meter-scale heterogeneity in XCO2. During retrograde metamorphism, the system evolved into a locally infiltration-dominated regime. Garnet-free layers selectively incorporated externally derived saline fluids, forming scapolite-II (XCl = 0.1–0.3), albitic plagioclase, and Ca-amphibole, recorded by scapolite-II overgrowths on scapolite-I and albitic rims on plagioclase (oligoclase to andesine). In contrast, garnet-bearing layers experienced anorthitization and destabilization of scapolite-I and clinopyroxene, releasing Na-rich and metal–chloride-bearing fluids. These contrasting metasomatic responses established a lithologic-scale Cl-circulation loop linked to variations in XCO2 and in the activities of Na+, Ca2+, and Cl–, explaining the selective stabilization of scapolite-II in garnet-free layers and oscillatory zoning in plagioclase. Mineralogical and geochemical evidence suggests that the saline fluids may have derived from deeply sourced metamorphic brines and/or NaCl (&#177; HCl)-bearing hydrothermal systems associated with post-collisional alkali magmatism. Scapolite–plagioclase mineral pairs thus provide robust constraints on fluid composition and metasomatic processes during regional metamorphism and subsequent exhumation. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s00410-026-02327-8
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 1
    Subjects:
      – SubjectFull: Metasomatism
        Type: general
      – SubjectFull: Fluids
        Type: general
      – SubjectFull: Metamorphism (Geology)
        Type: general
      – SubjectFull: Silicate minerals
        Type: general
      – SubjectFull: Metamorphic rocks
        Type: general
      – SubjectFull: Kyŏnggi-do (Korea)
        Type: general
      – SubjectFull: South Korea
        Type: general
    Titles:
      – TitleFull: Fluid evolution during the development of scapolite-bearing assemblages in striped calcsilicate layers between metapelites and metacarbonates.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Lee, Jeongmin
      – PersonEntity:
          Name:
            NameFull: Kim, Hyeong Soo
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          Dates:
            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 00107999
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              Value: 181
            – Type: issue
              Value: 6
          Titles:
            – TitleFull: Contributions to Mineralogy & Petrology
              Type: main
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