Oxygen isotope studies of ordinary chondrites

Clayton, Robert N.; Mayeda, T. K.; Goswami, J. N.; Olsen, Edward

doi:10.1016/0016-7037(91)90107-g

Cited by 448 publications

(470 citation statements)

References 47 publications

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“…Three oxygen isotopes ( 16 O À , 18 O À and 17 O À ) were measured in multicollection mode using multicollection Faraday cups and an axial electron multiplier (EM). The mass-resolving power for 17 O À and for 16 O À and 18 O À were set to B5,500 and B2,000, respectively. 16 OH À signal was monitored in every measured spot and was typically o10 6 counts per second, compared with typical 17 O À count rates of 2 Â 10 5 counts per second.…”

Section: Methodsmentioning

confidence: 99%

“…The mass-resolving power for 17 O À and for 16 O À and 18 O À were set to B5,500 and B2,000, respectively. 16 OH À signal was monitored in every measured spot and was typically o10 6 counts per second, compared with typical 17 O À count rates of 2 Â 10 5 counts per second. Contribution of 16 OH À onto 17 O À was corrected based on a peak/tail ratio.…”

Section: Methodsmentioning

confidence: 99%

“…16 OH À signal was monitored in every measured spot and was typically o10 6 counts per second, compared with typical 17 O À count rates of 2 Â 10 5 counts per second. Contribution of 16 OH À onto 17 O À was corrected based on a peak/tail ratio. The correction was typically o0.1% (B0.5% at most).…”

Section: Methodsmentioning

confidence: 99%

“…The three oxygen isotopes, 16 O À , 17 O À and 18 O À , were measured in multicollection mode using a multicollection Faraday cup, an axial EM and a multicollection EM, respectively. The internal and external reproducibility on the multiple analyses of the standards was B1-3% (2s) for both d 17 O and d 18 O.…”

Section: Methodsmentioning

confidence: 99%

“…This is done by focusing the electron beam, centring the grain of interest in the field of view and then increasing the magnification so that the electron beam is effectively a spot on the centre of the grain. The electron beam removes adsorbed water on the carbon coating in such a way that it appears as a dark spot in 16 O À scanning ion image in the ion probe. Scanning 16 O À images are obtained by rastering the B20 pA ion beam over an B10 Â 10 to 50 Â 50 mm 2 square.…”

Section: Methodsmentioning

confidence: 99%

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Early aqueous activity on the ordinary and carbonaceous chondrite parent bodies recorded by fayalite

et al. 2015

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Chronology of aqueous activity on chondrite parent bodies constrains their accretion times and thermal histories. Radiometric 53 Cr dating has been successfully applied to aqueously formed carbonates in CM carbonaceous chondrites. Owing to the absence of carbonates in ordinary (H, L and LL), and CV and CO carbonaceous chondrites, and the lack of proper standards, there are no reliable ages of aqueous activity on their parent bodies. Here we report the first 53 Mn-53 Cr ages of aqueously formed fayalite in the L3 chondrite Elephant Moraine 90161 as 2:4 þ 1:8 À 1:3 Myr after calcium-aluminium-rich inclusions (CAIs), the oldest Solar System solids. In addition, measurements using our synthesized fayalite standard show that fayalite in the CV3 chondrite Asuka 881317 and CO3-like chondrite MacAlpine Hills 88107 formed 4:2 þ 0:8 À 0:7 and 5:1 þ 0:5 À 0:4 Myr after CAIs, respectively. Thermal modelling, combined with the inferred conditions (temperature and water/rock ratio) and 53 Cr ages of aqueous alteration, suggests accretion of the L, CV and CO parent bodies B1.8 À 2.5 Myr after CAIs.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Early aqueous activity on the ordinary and carbonaceous chondrite parent bodies recorded by fayalite

et al. 2015

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Extraterrestrial Materials

Brownlee¹

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Extraterrestrial materials include meteorites that fall naturally to the Earth, as well as samples such as the Apollo and Luna collections collected in situ and returned to Earth by spacecraft. The samples contain highly detailed records of the conditions, processes, and materials that formed them, and these records can be studied in the laboratory with a wide array of modern analytical techniques. Meteorites are typically hand‐sized specimens that are samples of asteroids, small relict planetismals that originally escaped incorporation into planets and contain preserved materials dating back to the earliest history of the solar system. Meteorites are complex assemblages of a variety of components, and among the most exotic of these are interstellar grains that are older than the Sun and planets. Interplanetary dust particles are essentially submillimeter‐size meteorites that contain materials from comets as well as asteroids. Like the asteroids, the comets are also planetismals, but they formed beyond Saturn, whereas most of the asteroids formed between Mars and Jupiter.

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The Earth's Building Blocks

Moynier

Fegley

2015

The Early Earth

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In this paper we propose an updated bulk chemical composition of the Earth based on new estimates for the composition of the Earth's core. We present the different cosmochemical constraints that allow us to search for the Earth's building blocks.Chemical equilibrium calculations of gas -solid equilibria in solar composition gas show that at first approximation the Earth is chondritic for the refractory lithophile (rock-loving) elements. Elemental and isotopic compositions are then used to discuss the different possible types of meteoritic material (exemplified by the meteorites in our collections) that may represent the bulk Earth composition.

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Oxygen isotope studies of ordinary chondrites

Cited by 448 publications

References 47 publications

Early aqueous activity on the ordinary and carbonaceous chondrite parent bodies recorded by fayalite

Early aqueous activity on the ordinary and carbonaceous chondrite parent bodies recorded by fayalite

Extraterrestrial Materials

The Earth's Building Blocks

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