Effects of hot desert weathering on highly siderophile elements in ordinary chondritesOPEN ACCESS 

· by · in , , ,

Kiran Shahood Almas, Richard D. Ash, Richard J. Walker

MAPS, Version of Record online: 25 September 2024

LINK (OPEN ACCESS)
PDF (OPEN ACCESS)

“Over 20,000 meteorites have been recovered from hot deserts. The effects of hot desert weathering upon highly siderophile elements (HSE) have been little studied. We have investigated the effects of neutral to mildly acidic leaching of three L6-type ordinary chondrites of different weathering grades on HSE concentrations and Re-Os isotopic systematics. We have characterized the bulk sample HSE patterns of these meteorites and conducted leaching experiments with progressively longer leaching times to determine the possible effects of long-term residence in a desert. The most weathered sample (NWA 14239) displayed greater HSE concentration homogeneity than the other samples and released lower quantities of HSEs during leaching. Water leaching was milder than acetic acid and did not significantly modify the Re-Os isotopic systematics of the residue relative to the bulk sample of NWA 869. Short-term leachates of the less weathered samples (Viñales and NWA 869) were characterized by low 187Os/188Os ratios, indicating the preferential dissolution of early solar system–formed phases such as non-magnetic chondrules and matrix with low Re/Os that are no longer intact in the most weathered sample. Of the HSE, Pd is most resistant to both water and acetic acid leaching, with a maximum removal of ~5% Pd, while Re, Os, and Ir are most mobile with up to 40% removal.”

Related posts (automatically generated):

  1. Fractionation of highly siderophile elements in metal grains from unequilibrated ordinary chondrites: Implications for the origin of chondritic metals
  2. A 187Re-187Os, 87Rb-86Sr, highly siderophile and incompatible trace element study of some carbonaceous, ordinary and enstatite chondrite meteoritesOPEN ACCESS 
  3. Rapid effects of terrestrial alteration on highly siderophile elements in the Sutter’s Mill meteorite
  4. The effects of terrestrial weathering on samarium‑neodymium isotopic composition of ordinary chondritesOPEN ACCESS 
  5. Weathering of ordinary chondrites from Oman: Correlation of weathering parameters with 14C terrestrial ages and a refined weathering scale.
  6. Investigation of the shocked Viñales ordinary chondrite (L6) meteorite fall – Implications for shock classification, fragmentation, and collision dynamics
  7. Highly siderophile elements in shergottite sulfides and the sulfur content of the martian mantle
  8. Artificial weathering of an ordinary chondrite: Recommendations for the curation of Antarctic meteoritesOPEN ACCESS 
  9. Diverse impactors in Apollo 15 and 16 impact melt rocks: evidence from osmium isotopes and highly siderophile elements
  10. Oxygen and carbon stable isotope composition of the weathering Mg‐carbonates formed on the surface of the LEW 85320 ordinary chondrite: Revisited
Tags: , , , , , , , ,