Thermal history of an amoeboid olivine aggregate in the early solar nebulaOPEN ACCESS 

· by · in , , ,

M. Kimura, N. Imae, M. Komatsu, A. Yamaguchi

MAPS, Version of Record online: 14 October 2026

LINK (OPEN ACCESS)
PDF (OPEN ACCESS)

“Carbonaceous chondrites commonly contain amoeboid olivine aggregates (AOAs). Here, we investigated an AOA in the CR chondrite Y-793261. This AOA contains an unstable assemblage of forsterite and quartz. We found a rare occurrence of enstatite and quantitatively discuss its formation process. This enstatite occurs specifically between forsterite and quartz, indicating a solid-state reaction between them. By applying the experimental results of Imae et al. (Proc. Japan Aca. 75: 229–234), we determined that this AOA formed under high-temperature conditions (≳1169 K) over a period of approximately 1–5 years. The reservoir where the AOA formed was enriched in 16O. Subsequently, it cooled rapidly and was transported to the reservoir where the parent body accreted, incorporating chondrules and matrix. The thermal history and physicochemical conditions of this AOA are applicable to other AOAs.”

Related posts (automatically generated):

  1. Microstructural constraints on complex thermal histories of refractory CAI-like objects in an amoeboid olivine aggregate from the ALHA77307 CO3.0 chondrite
  2. An Amoeboid Olivine Aggregate Surrounded by an Igneous Ferroan Olivine-Rich Rim from CO3.0 Chondrite DOM 08006
  3. Formation of CV chondrules by recycling of amoeboid olivine aggregate-like precursors
  4. Chondrule heritage and thermal histories from trace element and oxygen isotope analyses of chondrules and amoeboid olivine aggregatesOPEN ACCESS 
  5. A common isotopic reservoir for amoeboid olivine aggregates (AOAs) and calcium-aluminum-rich inclusions (CAIs) revealed by Ti and Cr isotopic compositions
  6. Chondritic ingredients: II. Reconstructing early solar system history via refractory lithophile trace elements in individual objects of the Leoville CV3 chondrite
  7. A record of low-temperature asteroidal processes of amoeboid olivine aggregates from Kainsaz CO3.2 chondrite
  8. Formation conditions and chemical composition of early-condensed olivine in the solar protoplanetary disk
  9. LIME silicates in amoeboid olivine aggregates in carbonaceous chondrites: Indicator of nebular and asteroidal processes
  10. Condensate evolution in the solar nebula inferred from combined Cr, Ti, and O isotope analyses of amoeboid olivine aggregatesOPEN ACCESS 
Tags: , , ,