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Title: Origin of 16O-rich fine-grained Ca-Al-rich inclusions of different mineralogy and texture

Journal Article · · Chemie der Erde
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Univ. of New Mexico, Albuquerque, NM (United States); Lunar and Planetary Inst., Houston, TX (United States); NASA Johnson Space Center, Houston, TX (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States)
  4. Univ. of New Mexico, Albuquerque, NM (United States)
  5. NASA Johnson Space Center, Houston, TX (United States)

We conducted a coordinated mineralogical and oxygen isotopic study of four fine-grained calcium-, aluminum-rich inclusions (CAIs) from the ALHA77307 CO3.0 carbonaceous chondrite. Three of the inclusions studied, 05, 1-65, and 2-119, all have nodular structures that represent three major groups, melilite-rich, spinel-rich, and hibonite-rich, based on their primary core mineral assemblages. A condensation origin was inferred for these CAIs. However, the difference in their primary core mineralogy reflects unique nebular environments in which multiple gas-solid reactions occurred under disequilibrium conditions to form hibonite, spinel, and melilite with minor perovskite and Al,Ti-rich diopside. A common occurrence of a diopside rim on the CAIs records a widespread event that marks the end of their condensation as a result of isolation from a nebular gas. An exception is a rare inclusion 2-112 that contains euhedral spinel crystals embedded in melilite, suggesting this CAI had been re-melted. All of the fine-grained CAIs analyzed in ALHA77307 are 16O-rich with an average Δ17O value of ~-22 ± 5‰ (2σ), indicating no apparent correlation between their textures and oxygen isotopic compositions. We therefore conclude that a prevalent 16O-rich gas reservoir existed in a region of the solar nebula where CO3 fine-grained CAIs formed, initially by condensation and then later, some of them were reprocessed by melting event(s).

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; 17-EW17-2-0148; NNG06GG37G; NNX12AH59G; NNX15AD28G
OSTI ID:
1597615
Alternate ID(s):
OSTI ID: 1575285
Report Number(s):
LLNL-JRNL-764462; 954483
Journal Information:
Chemie der Erde, Vol. 79, Issue 4; ISSN 0009-2819
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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