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Amphibole as a witness of chromitite formation and fluid metasomatism in ophiolites

  • Qi-Qi Pan , Yan Xiao , Ben-Xun Su , Xia Liu , Paul T. Robinson , Ibrahim Uysal , Peng-Fei Zhang and Patrick Asamoah Sakyi
Published/Copyright: January 26, 2022
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American Mineralogist
From the journal American Mineralogist Volume 107 Issue 2

Abstract

Here we present new occurrences of amphibole in a suite of chromitites, dunites, and harzburgites from the mantle sequence of the Lycian ophiolite in the Tauride Belt, southwest Turkey. The amphibole occurs both as interstitial grains among the major constituent minerals and as inclusions in chromite grains. The interstitial amphibole shows generally decreasing trends in Na2O and Al2O3 contents from the chromitites (0.14–1.54 wt% and 0.04–6.67 wt%, respectively) and the dunites (0.09–2.37 wt%; 0.12–11.9 wt%) to the host harzburgites (<0.61 wt%; 0.02–5.41 wt%). Amphibole inclusions in chromite of the amphibole-bearing harzburgites are poorer in Al2O3 (1.12–8.86 wt%), CaO (8.47–13.2 wt%), and Na2O (b.d.l.–1.38 wt%) than their counterparts in the amphibole-bearing chromitites (Al2O3 = 6.13–10.0 wt%; CaO = 12.1–12.9 wt%; Na2O = 1.11–1.91 wt%). Estimated crystallization temperatures for the interstitial amphibole grains and amphibole inclusions range from 706 to 974 °C, with the higher values in the latter. A comparison of amphibole inclusions in chromite with interstitial grains provides direct evidence for the involvement of water in chromitite formation and the presence of hydrous melt/fluid metasomatism in the peridotites during initial subduction of Neo-Tethyan oceanic lithosphere. The hydrous melts/fluids were released from the chromitites after being collected on chromite surfaces during crystallization. Different fluid/wall rock ratios are thought to have controlled the crystallization and composition of the Lycian amphibole and the extent of modification of the chromite and pyroxene grains in the peridotites. Considering the wide distribution of podiform chromitites in this ophiolite, the link between chromitite formation and melt/fluid metasomatism defined in our study may be applicable to other ophiolites worldwide.

Keywords: Amphibole; peridotite; chromitite; hydrous melts/fluids; ophiolite

Acknowledgments and Funding

Constructive and detailed comments from two anonymous reviewers and the editor Sarah Penniston-Dorland are greatly appreciated. This study was financially supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0801), the National Natural Science Foundation of China (Grants 91755205 and 41772055), and Youth Innovation Promotion Association, Chinese Academy of Sciences (2017095).

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Received: 2020-11-05
Accepted: 2021-01-27
Published Online: 2022-01-26
Published in Print: 2022-02-23

© 2022 Mineralogical Society of America

Articles in the same Issue

  1. Alumino-oxy-rossmanite from pegmatites in Variscan metamorphic rocks from Eibenstein an der Thaya, Lower Austria, Austria: A new tourmaline that represents the most Al-rich end-member composition
  2. Fluorine partitioning between quadrilateral clinopyroxenes and melt
  3. Multi-stage magma evolution recorded by apatite and zircon of adakite-like rocks: A case study from the Shatanjiao intrusion, Tongling region, Eastern China
  4. The physical and chemical evolution of magmatic fluids in near-solidus silicic magma reservoirs: Implications for the formation of pegmatites
  5. Texture, geochemistry, and geochronology of titanite and pyrite: Fingerprint of magmatic-hydrothermal fertile fluids in the Jiaodong Au province
  6. Polytypism in semi-disordered lizardite and amesite by low-dose HAADF-STEM
  7. Peralkalinity in peraluminous granitic pegmatites. I. Evidence from whewellite and hydrogen carbonate in fluid inclusions
  8. Peralkalinity in peraluminous granitic pegmatites. II. Evidence from experiments on carbonate formation in spodumene-bearing assemblages
  9. Ab initio study of structural, elastic and thermodynamic properties of Fe3S at high pressure: Implications for planetary cores
  10. Removal of barite from zircon using an aqueous solution of diethylenetriaminepentaacetic acid and potassium carbonate
  11. Improving grain size analysis using computer vision techniques and implications for grain growth kinetics
  12. Crystal chemistry of arsenian pyrites: A Raman spectroscopic study
  13. Formation of the Maoniuping giant REE deposit: Constraints from mineralogy and in situ bastnäsite U-Pb geochronology
  14. Amphibole as a witness of chromitite formation and fluid metasomatism in ophiolites
  15. Ferro-papikeite, ideally NaFe2 2+(Fe32+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure
  16. Letter
  17. HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth
  18. New Mineral Names: Alteration Products
  19. American Mineralogist thanks the 2021 reviewers
https://doi.org/10.2138/am-2021-7593
Keywords for this article
Amphibole; peridotite; chromitite; hydrous melts/fluids; ophiolite

Articles in the same Issue

  1. Alumino-oxy-rossmanite from pegmatites in Variscan metamorphic rocks from Eibenstein an der Thaya, Lower Austria, Austria: A new tourmaline that represents the most Al-rich end-member composition
  2. Fluorine partitioning between quadrilateral clinopyroxenes and melt
  3. Multi-stage magma evolution recorded by apatite and zircon of adakite-like rocks: A case study from the Shatanjiao intrusion, Tongling region, Eastern China
  4. The physical and chemical evolution of magmatic fluids in near-solidus silicic magma reservoirs: Implications for the formation of pegmatites
  5. Texture, geochemistry, and geochronology of titanite and pyrite: Fingerprint of magmatic-hydrothermal fertile fluids in the Jiaodong Au province
  6. Polytypism in semi-disordered lizardite and amesite by low-dose HAADF-STEM
  7. Peralkalinity in peraluminous granitic pegmatites. I. Evidence from whewellite and hydrogen carbonate in fluid inclusions
  8. Peralkalinity in peraluminous granitic pegmatites. II. Evidence from experiments on carbonate formation in spodumene-bearing assemblages
  9. Ab initio study of structural, elastic and thermodynamic properties of Fe3S at high pressure: Implications for planetary cores
  10. Removal of barite from zircon using an aqueous solution of diethylenetriaminepentaacetic acid and potassium carbonate
  11. Improving grain size analysis using computer vision techniques and implications for grain growth kinetics
  12. Crystal chemistry of arsenian pyrites: A Raman spectroscopic study
  13. Formation of the Maoniuping giant REE deposit: Constraints from mineralogy and in situ bastnäsite U-Pb geochronology
  14. Amphibole as a witness of chromitite formation and fluid metasomatism in ophiolites
  15. Ferro-papikeite, ideally NaFe2 2+(Fe32+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure
  16. Letter
  17. HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth
  18. New Mineral Names: Alteration Products
  19. American Mineralogist thanks the 2021 reviewers
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