Rare earth element abundances in stony spherules from deep-sea sediments.

Misawa, K.; Yamakoshi, Kazuo; Nogami, K.; Yamamoto, Koshi; Nakamura, Noboru

doi:10.2343/geochemj.26.197

Cited by 2 publications

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“…The abundances of Na, Sc, Cr, Fe, Ni, Co, Ir, and Au were determined by instrumental neutron activation analysis (INAA), using essen tially the same procedure described by Misawa et al (1992). Abundances of Mg, K, Ca, Rb, Sr, Ba, and REE were determined by a mass spec trometric isotope dilution (MSID) technique following conventional cation exchange chemistry.…”

Section: Methodsmentioning

confidence: 99%

A noritic clast from the Hedjaz chondritic breccia: implications for melting events in the early solar system.

et al. 1992

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and Au were deter mined in a unique, noritic clast carrying a fractionated REE component from the Hedjaz (L) chondritic breccia by instrumental neutron activation analysis and isotope dilution mass spectrometry. The clast, previously described by Nakamura et al. (1990), consists of two lithologies, and is depleted in siderophile and moderately volatile lithophile elements when compared with its host meteorite. The REE abundance pattern of the clast is L-chondritic (1.4-1.6 x CI-chondrite) with a large (62%), positive Eu anomaly. Strontium is also enriched (3.2 x CI-chondrite) relative to trivalent REE.Chemical and petrologic data suggest that the elemental fractionations observed in the Hedjaz noritic clast could be accomplished in a single host-like parent body with several episodes of impact melting and heating. An impact melt enriched in feldspar components could have been generated in a neighboring region on a parent body, and then infiltrated into the precursor material of the clast. An enhancement of plagiophile elements would then be produced in the clast. Moderately volatile element and siderophile element fractionations could be related to gas /solid or gas /liquid processes and silicate/metal melt fractionations, respectively, which may have occurred during melting and formation of the clast.

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Section: Methodsmentioning

confidence: 99%

A noritic clast from the Hedjaz chondritic breccia: implications for melting events in the early solar system.

et al. 1992

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Mg isotopic compositions of stony spherules from deep-sea sediments.

1992

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The isotopic compositions of Mg in 5 individual stony spherules from deep-sea sediments have been measured. The spherules are composed of olivine, glass, and magnetite, and considered to be of extrater restrial origin. No significant mass fractionation of up to 2 per mil per amu was recognized. One sample showed a small but significant non-linear 26Mg isotopic effect (626Mg= + 1.2 per mil) similar to that reported in interplanetary dust particles (IDPs). Based on Mg isotopic compositions of the spherules, we suggest that either vaporization mass loss of parent meteoroids of stony spherules was not so large, usu ally less than 20%, or ablative mass loss occurred effectively during entry into the Earth's atmosphere, and that physicochemical fractionations took place in parent meteoroids could be related to those of primitive IDPs. The processes responsible for the non-linear effect of 26Mg, however, remain undefined.

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Rare earth element abundances in stony spherules from deep-sea sediments.

Cited by 2 publications

References 30 publications

A noritic clast from the Hedjaz chondritic breccia: implications for melting events in the early solar system.

A noritic clast from the Hedjaz chondritic breccia: implications for melting events in the early solar system.

Mg isotopic compositions of stony spherules from deep-sea sediments.

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