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Apatite in brachinites: Insights into thermal history and halogen evolution

  • Lang Zhang , Ai-Cheng Zhang ORCID logo and Shu-Zhou Wang
Published/Copyright: August 31, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 9

Abstract

Apatite is an important petrogenetic indicator in extraterrestrial materials. Here, we report the mineralogical features of apatite and associated phases in three brachinites Northwest Africa (NWA) 4969, NWA 10637, and NWA 11756. Two types of apatite are observed: intergranular apatite and apatite inclusion within chromite and silicate minerals. The intergranular chlorapatite is enclosed by or penetrated by irregular porous merrillite, indicating chlorapatite replacement by merrillite. The intergranular chlorapatite is closely associated with a fine-grained pyroxene-troilite intergrowth along olivine grain boundaries, which is a sulfidization product of olivine. High-Ca pyroxene is observed as a constituent phase in the intergrowth for the first time. The apatite inclusions are either monomineralic or closely associated with subhedral-euhedral pore-free merrillite. In NWA 4969, the apatite inclusions show a large compositional variation from chlorapatite to fluorapatite and are systematically more F-rich than intergranular apatite; while the apatite inclusions in NWA 10637 and NWA 11756 are chlorapatite. Most of the two apatite types in brachinites contain oriented tiny or acicular chromite grains, suggesting the exsolution of chromite from apatite. We propose that apatite replacement by merrillite, formation of pyroxene-troilite intergrowth, and exsolution of chromite in apatite were caused by a shock-induced, transient heating event (~930–1000 °C) on the brachinite parent body. This heating event resulted in halogen devolatilization during replacement of the intergranular apatite by merrillite, which probably disturbed the Mn-Cr isotopic system in brachinites as well. We also propose that the apatite inclusions could be a residual precursor material of the brachinites.

Keywords: Apatite; merrillite; halogen; replacement; sulfidization; exsolution; brachinite; Experimental Halogens in Honor of Jim Webster

Acknowledgments and Funding

We thank Rhian H. Jones and an anonymous reviewer for their constructive and helpful comments, and Daniel Harlov for his editorial effort. This study was financially supported by National Natural Science Foundation of China (42025302, 41973061), the B-type Strategic Priority Program of the Chinese Academy of Sciences (XDB41000000), and the pre-research Project on Civil Aerospace Technologies funded by CNSA (D020204).

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Received: 2022-07-17
Accepted: 2022-10-13
Published Online: 2023-08-31
Published in Print: 2023-09-26

© 2023 by Mineralogical Society of America

Articles in the same Issue

  1. Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits
  2. Apatite in brachinites: Insights into thermal history and halogen evolution
  3. A high-pressure structural transition of norsethite-type BaFe(CO3)2: Comparison with BaMg(CO3)2 and BaMn(CO3)2
  4. An evolutionary system of mineralogy, Part VII: The evolution of the igneous minerals (>2500 Ma)
  5. Oriented secondary magnetite micro-inclusions in plagioclase from oceanic gabbro
  6. A multi-methodological study of the bastnäsite-synchysite polysomatic series: Tips and tricks of polysome identification and the origin of syntactic intergrowths
  7. Petrogenesis of Chang’E-5 mare basalts: Clues from the trace elements in plagioclase
  8. Experimental investigation of trace element partitioning between amphibole and alkali basaltic melt: Toward a more general partitioning model with implications for amphibole fractionation at deep crustal levels
  9. Grain-scale zircon Hf isotope heterogeneity inherited from sediment-metasomatized mantle: Geochemical and Nd-Hf-Pb-O isotopic constraints on Early Cretaceous intrusions in central Lhasa Terrane, Tibetan Plateau
  10. Mechanism and kinetics of the pseudomorphic replacement of anhydrite by calcium phosphate phases at hydrothermal conditions
  11. Vacancy infilling during the crystallization of Fe-deficient hematite: An in situ synchrotron X-ray diffraction study of non-classical crystal growth
  12. Simulated diagenesis of the iron-silica precipitates in banded iron formations
  13. Wave vector and field vector orientation dependence of Fe K pre-edge X-ray absorption features in clinopyroxenes
  14. Structure and compressibility of Fe-bearing Al-phase D
  15. Synthesis of boehmite-type GaOOH: A new polymorph of Ga oxyhydroxide and geochemical implications
  16. Scheelite U-Pb geochronology and trace element geochemistry fingerprint W mineralization in the giant Zhuxi W deposit, South China
  17. A rare sekaninaite occurrence in the Nenana Coal Basin, Alaska Range, Alaska
  18. Slyudyankaite, Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2)·2H2O, a new sodalite-group mineral from the Malo-Bystrinskoe lazurite deposit, Baikal Lake area, Russia
  19. Ruizhongite, (Ag2□)Pb3Ge2S8, a thiogermanate mineral from the Wusihe Pb-Zn deposit, Sichuan Province, Southwest China
https://doi.org/10.2138/am-2022-8712
Keywords for this article
Apatite; merrillite; halogen; replacement; sulfidization; exsolution; brachinite; Experimental Halogens in Honor of Jim Webster

Articles in the same Issue

  1. Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits
  2. Apatite in brachinites: Insights into thermal history and halogen evolution
  3. A high-pressure structural transition of norsethite-type BaFe(CO3)2: Comparison with BaMg(CO3)2 and BaMn(CO3)2
  4. An evolutionary system of mineralogy, Part VII: The evolution of the igneous minerals (>2500 Ma)
  5. Oriented secondary magnetite micro-inclusions in plagioclase from oceanic gabbro
  6. A multi-methodological study of the bastnäsite-synchysite polysomatic series: Tips and tricks of polysome identification and the origin of syntactic intergrowths
  7. Petrogenesis of Chang’E-5 mare basalts: Clues from the trace elements in plagioclase
  8. Experimental investigation of trace element partitioning between amphibole and alkali basaltic melt: Toward a more general partitioning model with implications for amphibole fractionation at deep crustal levels
  9. Grain-scale zircon Hf isotope heterogeneity inherited from sediment-metasomatized mantle: Geochemical and Nd-Hf-Pb-O isotopic constraints on Early Cretaceous intrusions in central Lhasa Terrane, Tibetan Plateau
  10. Mechanism and kinetics of the pseudomorphic replacement of anhydrite by calcium phosphate phases at hydrothermal conditions
  11. Vacancy infilling during the crystallization of Fe-deficient hematite: An in situ synchrotron X-ray diffraction study of non-classical crystal growth
  12. Simulated diagenesis of the iron-silica precipitates in banded iron formations
  13. Wave vector and field vector orientation dependence of Fe K pre-edge X-ray absorption features in clinopyroxenes
  14. Structure and compressibility of Fe-bearing Al-phase D
  15. Synthesis of boehmite-type GaOOH: A new polymorph of Ga oxyhydroxide and geochemical implications
  16. Scheelite U-Pb geochronology and trace element geochemistry fingerprint W mineralization in the giant Zhuxi W deposit, South China
  17. A rare sekaninaite occurrence in the Nenana Coal Basin, Alaska Range, Alaska
  18. Slyudyankaite, Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2)·2H2O, a new sodalite-group mineral from the Malo-Bystrinskoe lazurite deposit, Baikal Lake area, Russia
  19. Ruizhongite, (Ag2□)Pb3Ge2S8, a thiogermanate mineral from the Wusihe Pb-Zn deposit, Sichuan Province, Southwest China
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