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Near end-member shenzhuangite, NiFeS2, found in Muong Nong-type tektites from Laos

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Veröffentlicht/Copyright: 27. Juli 2019
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 104 Heft 8

Abstract

Australasian Muong Nong-type tektites from the locality centered at 16.46150° N, 106.48917° E in Laos contain sporadic spherical heterogeneous sulfide inclusions less than 10 μm in diameter, which have been identified by electron probe microanalyzer and electron backscatter diffraction to represent a mixture of rare mineral shenzhuangite with a pyrrhotite polytype (possibly troilite). Contrary to type shenzhuangite found in the shocked L6 chondrite Suizhou, the mineral embedded in the tektite glass is nearly free of copper, making the composition close to its expected end-member that has not yet been found in nature; the empirical formula closest to ideal end-member composition based on four atoms per formula unit is Ni1.007Fe0.998Cu0.016Co0.058S1.922. The described occurrence also represents the first find of shenzhuangite in terrestrial material. Presented is the Raman spectrum for shenzhuangite with the tentative assignment of spectral bands based on the analogy with synthetic chalcopyrite-structured phases. The chemical composition of shenzhuangite close to NiFeS2 is not consistent with any stable phase in the Fe–Ni–S system up to melting temperature. Available data so far on phase relations in this system do not allow unambiguous interpretation of conditions under which the sulfide association within inclusions had formed.

Keywords: Shenzhuangite; tektites; Australasian strewn field; electron backscatter diffraction; electron probe microanalysis; Raman spectroscopy; meteoritic component

Funding and Acknowledgments

This research was funded by the Czech Science Foundation Project No. 17-27099S and was conducted with institutional support RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences. We highly appreciated the reviews by C. Koeberl and two anonymous reviewers, which helped to improve the early version of the manuscript.

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Received: 2018-12-15
Accepted: 2019-04-26
Published Online: 2019-07-27
Published in Print: 2019-08-27

© 2019 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. MSA Presidential Address
  2. Metamorphism and the evolution of subduction on Earth
  3. Experimental investigation of FeCO3 (siderite) stability in Earth’s lower mantle using XANES spectroscopy
  4. Comparison of fluid processes in coexisting wolframite and quartz from a giant vein-type tungsten deposit, South China: Insights from detailed petrography and LA-ICP-MS analysis of fluid inclusions
  5. Monazite and xenotime solubility in hydrous, boron-bearing rhyolitic melt
  6. Solving the iron quantification problem in low-kV EPMA: An essential step toward improved analytical spatial resolution in electron probe microanalysis—Olivines
  7. Transition metals in komatiitic olivine: Proxies for mantle composition, redox conditions, and sulfide mineralization potential
  8. Formation of saponite by hydrothermal alteration of metal oxides: Implication for the rarity of hydrotalcite
  9. Near end-member shenzhuangite, NiFeS2, found in Muong Nong-type tektites from Laos
  10. Pressure-induced velocity softening in natural orthopyroxene at mantle temperature
  11. The role of mineral nanoparticles at a fluid-magnetite interface: Implications for trace-element uptake in hydrothermal systems
  12. Melting temperature depression due to the electronic spin transition of iron
  13. Epidote spherulites and radial euhedral epidote aggregates in a greenschist facies metavolcanic breccia hosting an UHP eclogite in Dabieshan (China): Implication for dynamic metamorphism
  14. A new (Mg0.5Fe0.53+)(Si0.5Al0.53+)O3 LiNbO3-type phase synthesized at lower mantle conditions
https://doi.org/10.2138/am-2019-6930
Schlagwörter für diesen Artikel
Shenzhuangite; tektites; Australasian strewn field; electron backscatter diffraction; electron probe microanalysis; Raman spectroscopy; meteoritic component

Artikel in diesem Heft

  1. MSA Presidential Address
  2. Metamorphism and the evolution of subduction on Earth
  3. Experimental investigation of FeCO3 (siderite) stability in Earth’s lower mantle using XANES spectroscopy
  4. Comparison of fluid processes in coexisting wolframite and quartz from a giant vein-type tungsten deposit, South China: Insights from detailed petrography and LA-ICP-MS analysis of fluid inclusions
  5. Monazite and xenotime solubility in hydrous, boron-bearing rhyolitic melt
  6. Solving the iron quantification problem in low-kV EPMA: An essential step toward improved analytical spatial resolution in electron probe microanalysis—Olivines
  7. Transition metals in komatiitic olivine: Proxies for mantle composition, redox conditions, and sulfide mineralization potential
  8. Formation of saponite by hydrothermal alteration of metal oxides: Implication for the rarity of hydrotalcite
  9. Near end-member shenzhuangite, NiFeS2, found in Muong Nong-type tektites from Laos
  10. Pressure-induced velocity softening in natural orthopyroxene at mantle temperature
  11. The role of mineral nanoparticles at a fluid-magnetite interface: Implications for trace-element uptake in hydrothermal systems
  12. Melting temperature depression due to the electronic spin transition of iron
  13. Epidote spherulites and radial euhedral epidote aggregates in a greenschist facies metavolcanic breccia hosting an UHP eclogite in Dabieshan (China): Implication for dynamic metamorphism
  14. A new (Mg0.5Fe0.53+)(Si0.5Al0.53+)O3 LiNbO3-type phase synthesized at lower mantle conditions
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