Derivation of a heterogeneous lithic fragment in the Bovedy L-group chondrite from impact-melted porphyritic chondrules

Rubin, Alan E.; Keil, K.; Taylor, G. J.; Ma, M.-S.; Schmitt, R. A.; Bogard, D. D.

doi:10.1016/0016-7037(81)90073-9

Cited by 37 publications

(25 citation statements)

References 41 publications

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“…Recalculated from Keil (1969). drites; this is consistent with the clast's depletion of metallic Fe-Ni. Similar fractionation of siderophile elements was reported on a lithic frag ment from Bovedy (Rubin et al, 1981). The depletion factor reaches about 100 times for Ni and is greater for Ir.…”

Section: Elemental Abundancessupporting

confidence: 82%

“…In light of the more L-chondrite-like refrac tory/ Si ratios in the clast and the similarity of fractionation patterns of moderately volatile elements in the noritic clast studied here and the lithic fragment from Bovedy (Rubin et al, 1981), we favor of an L-chondrite precursor. The two different lithologies (granular and skeletal tex tures) observed in this mm-scale clast may be related to the difference of degree of partial melting.…”

Section: Siderophile Element Fractionationmentioning

confidence: 49%

“…6), which is also observed in the Bovedy lithic fragment (Rubin et al, 1981), is not consis tent with fractional crystallization processes. Moreover, a low K/ La ratio (<_ 500) of the clast relative to ones of Hedjaz host (K/La=2240) as well as ordinary and CI-chondrites can not be due to any solid /liquid fractionations which took place in ordinary or CI-chondrite parent bodies (Wanke, 1975).…”

Section: Formation Of the Noritic Clastmentioning

confidence: 77%

“…The REE pattern of the clast is flat (1.4-1.6 x CI chondrite) with a large, positive (62%) Eu anomaly, distinguishing it from patterns ob tained from lithic fragments in ordinary chon drites. The clasts from Bovedy and Plainview ex hibit flat REE patterns with no Eu anomaly Rubin et al, 1981). The REE pat tern of a pebble in Barwell is fractionated with light REE-enriched, and a positive Eu anomaly (Hutchison et al, 1988).…”

Section: Elemental Abundancesmentioning

confidence: 97%

“…Such a petrographic feature observed in lithology (II) is similar to the light-colored, vesicular region of the shock-melted meteorite Shaw (Taylor et al, 1979), the angular fragment in Ngawi (Fodor. and Keil, 1978), and the lithic fragment in Bovedy (Rubin et al, 1981).…”

Section: Petrography and Mineralogymentioning

confidence: 99%

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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: Elemental Abundancessupporting

confidence: 82%

Section: Siderophile Element Fractionationmentioning

confidence: 49%