Mn−Cr ages of Fe-rich olivine in two Rumuruti (R) chondrites

Sugiura, N.; Miyazaki, Akiko

doi:10.1186/bf03351966

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…Constraints on the timing of these events have been provided by several studies of R chondrite components and whole rocks. Cooling ages recorded in olivines from chondrules using Mn‐Cr system are 5–10 Ma after T 0 (Sugiura and Miyazaki ), where T 0 represents the age of the solar system. The previous 40 Ar/ 39 Ar and K‐Ar chronological studies of Dixon et al.…”

Section: Discussionmentioning

confidence: 99%

Preservation of ancient impact ages on the R chondrite parent body: ⁴⁰Ar/³⁹Ar age of hornblende‐bearing R chondrite LAP 04840

Righter

Morgan

2016

Meteorit & Planetary Scien

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The hornblende-and biotite-bearing R chondrite LAP 04840 is a rare kind of meteorite possibly containing outer solar system water stored during metamorphism or postshock annealing deep within an asteroid. Because little is known regarding its age and origin, we determined 40 Ar/ 39 Ar ages on hornblende-rich separates of the meteorite, and obtained plateau ages of 4340(AE40) to 4380(AE30) Ma. These well-defined plateau ages, coupled with evidence for postshock annealing, indicate this meteorite records an ancient shock event and subsequent annealing. The age of Ga) for this and other previously dated R chondrites is much older than most impact events recorded by ordinary chondrites and points to an ancient event or events that predated the late heavy bombardment that is recorded in so many meteorites and lunar samples.

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Section: Discussionmentioning

confidence: 99%