Nucleosynthetic components of the early solar system inferred from Ba isotopic compositions in carbonaceous chondrites

The Sun is 16O-enriched (Δ17O = −28.4 ± 3.6‰) relative to the terrestrial planets, asteroids, and chondrules (−7‰ < Δ17O < 3‰). Ca,Al-rich inclusions (CAIs), the oldest Solar System solids, approach the Sun’s Δ17O. Ultraviolet CO self-shielding resulting in formation of 16O-rich CO and 17,18O-enriched water is the currently favored mechanism invoked to explain the observed range of Δ17O. However, the location of CO self-shielding (molecular cloud or protoplanetary disk) remains unknown. Here we show that CAIs with predominantly low (26Al/27Al)0, <5 × 10−6, exhibit a large inter-CAI range of Δ17O, from −40‰ to −5‰. In contrast, CAIs with the canonical (26Al/27Al)0 of ~5 × 10−5 from unmetamorphosed carbonaceous chondrites have a limited range of Δ17O, −24 ± 2‰. Because CAIs with low (26Al/27Al)0 are thought to have predated the canonical CAIs and formed within first 10,000–20,000 years of the Solar System evolution, these observations suggest oxygen isotopic heterogeneity in the early solar system was inherited from the protosolar molecular cloud.

Download Full-text

The thallium isotope composition of carbonaceous chondrites — New evidence for live 205Pb in the early solar system

Earth and Planetary Science Letters ◽

10.1016/j.epsl.2009.12.044 ◽

2010 ◽

Vol 291 (1-4) ◽

pp. 39-47 ◽

Cited By ~ 39

Author(s):

R.G.A. Baker ◽

M. Schönbächler ◽

M. Rehkämper ◽

H.M. Williams ◽

A.N. Halliday

Keyword(s):

Solar System ◽

Isotope Composition ◽

Carbonaceous Chondrites ◽

Early Solar System ◽

New Evidence

Download Full-text

LITHIUM–BERYLLIUM–BORON ISOTOPIC COMPOSITIONS IN METEORITIC HIBONITE: IMPLICATIONS FOR ORIGIN OF 10 Be AND EARLY SOLAR SYSTEM IRRADIATION

The Astrophysical Journal ◽

10.1088/2041-8205/719/1/l99 ◽

2010 ◽

Vol 719 (1) ◽

pp. L99-L103 ◽

Cited By ~ 31

Author(s):

Ming-Chang Liu ◽

Larry R. Nittler ◽

Conel M. O’D. Alexander ◽

Typhoon Lee

Keyword(s):

Solar System ◽

Early Solar System ◽

Isotopic Compositions

Download Full-text

Carbon and Nitrogen Contents of Carbonaceous Chondrites and Their Implications for a Primitive Condensate in the Early Solar System

Chemistry Letters ◽

10.1246/cl.1987.2013 ◽

1987 ◽

Vol 16 (10) ◽

pp. 2013-2016 ◽

Cited By ~ 3

Author(s):

Akira Shimoyama ◽

Kaoru Harada ◽

Keizo Yanai

Keyword(s):

Solar System ◽

Carbonaceous Chondrites ◽

Early Solar System ◽

Carbon And Nitrogen ◽

Nitrogen Contents

Download Full-text

Arrival and magnetization of carbonaceous chondrites in the asteroid belt before 4562 million years ago

Communications Earth & Environment ◽

10.1038/s43247-020-00055-w ◽

2020 ◽

Vol 1 (1) ◽

Author(s):

Timothy O’Brien ◽

John A. Tarduno ◽

Atma Anand ◽

Aleksey V. Smirnov ◽

Eric G. Blackman ◽

...

Keyword(s):

Solar System ◽

Arrival Time ◽

Carbonaceous Chondrite ◽

Parent Body ◽

Asteroid Belt ◽

Carbonaceous Chondrites ◽

Early Solar System ◽

Outer Disk ◽

Main Asteroid Belt ◽

Insight Into

AbstractMeteorite magnetizations can provide rare insight into early Solar System evolution. Such data take on new importance with recognition of the isotopic dichotomy between non-carbonaceous and carbonaceous meteorites, representing distinct inner and outer disk reservoirs, and the likelihood that parent body asteroids were once separated by Jupiter and subsequently mixed. The arrival time of these parent bodies into the main asteroid belt, however, has heretofore been unknown. Herein, we show that weak CV (Vigarano type) and CM (Mighei type) carbonaceous chondrite remanent magnetizations indicate acquisition by the solar wind 4.2 to 4.8 million years after Ca-Al-rich inclusion (CAI) formation at heliocentric distances of ~2–4 AU. These data thus indicate that the CV and CM parent asteroids had arrived near, or within, the orbital range of the present-day asteroid belt from the outer disk isotopic reservoir within the first 5 million years of Solar System history.

Download Full-text