Ni isotopic compositions in shocked ordinary chondrites: Insights into the influence of shock processes

· by · in ,

Zhi Li, Ying-Kui Xu, Shui-Jiong Wang, Si-Zhang Sheng, Shi-Jie Li, Xiong-Yao Li, Jian-Zhong Liu, Dan Zhu

MAPS, Version of Record online: 28 May 2025

LINK

“High-energy impact events prevalent during planetary accretion in the solar system’s evolution significantly shaped planetary bodies, though the effects of shock metamorphism on nickel (Ni) isotope fractionation remain unclear. To investigate the effect of the shock process on Ni isotopes, we selected three shocked ordinary chondrites (OCs) and obtained three sample pairs, each consisting of a melted region and its corresponding unmelted region. We also prepared two whole rock samples and four pairs of magnetic and coupled nonmagnetic samples. The shock melt pockets (SMPs) from three shocked OCs (Chelyabinsk LL5, Viñales L6, Tassédet 004 H5) show δ60Ni values of 0.15 ± 0.05‰, 0.14 ± 0.02‰, and 0.20 ± 0.04‰, while adjacent unmelted parts show δ60Ni values of 0.21 ± 0.03‰, 0.19 ± 0.01‰, and 0.19 ± 0.03‰. These data are slightly higher than the BSE value (0.11 ± 0.01‰) but generally overlap with the Ni isotopic variation of OCs (0.15–0.51‰) reported in previous studies. The SMPs do not show discernible isotopic variations relative to coupled unmelted parts, suggesting that shock-induced evaporation could not cause Ni isotope fractionation. The value of bulk OCs is calculated by compiling data from previous and this study, yielding a value of 0.21+0.28/-0.11‰. Moreover, no consistent Ni isotopic variations from four pairs of magnetic and nonmagnetic counterparts are observed. Several possible processes resulting in Ni isotopic variations are discussed. A slight negative correlation between S content and Ni isotopic composition, along with a positive correlation between Ni elemental and isotopic composition in shocked OCs, suggests that the Ni isotopic characteristics may be predominantly influenced by the relative proportions of metal and sulfide phases.”

Related posts (automatically generated):

  1. Influence of redox processes on the germanium isotopic composition of ordinary chondrites
  2. Heat diffusion in numerically shocked ordinary chondrites and its contribution to shock meltingOPEN ACCESS 
  3. Investigation of the shocked Viñales ordinary chondrite (L6) meteorite fall – Implications for shock classification, fragmentation, and collision dynamics
  4. Shock physics mesoscale modeling of shock stage 5 and 6 in ordinary and enstatite chondritesOPEN ACCESS 
  5. Systematic investigations of high‐pressure polymorphs in shocked ordinary chondrites
  6. Experimental constraints on the ordinary chondrite shock darkening caused by asteroid collisionsOPEN ACCESS 
  7. Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709
  8. Shock-induced potassium and zinc isotope fractionation in ordinary chondrites and its implications
  9. Shock stage distribution of 2280 ordinary chondrites—Can bulk chondrites with a shock stage of S6 exist as individual rocks?
  10. Shock-darkening in ordinary chondrites: Determination of the pressure-temperature conditions by shock physics mesoscale modeling.
Tags: , , , , , , , ,