High‐pressure phases in shock‐induced melt of the unique highly shocked LL 6 chondrite Northwest Africa 757

Hu, Jinping; Sharp, Thomas G.

doi:10.1111/maps.12672

Title: High‐pressure phases in shock‐induced melt of the unique highly shocked LL 6 chondrite Northwest Africa 757

Journal Article · Thu Jun 02 00:00:00 EDT 2016 · Meteoritics and Planetary Science

DOI:https://doi.org/10.1111/maps.12672· OSTI ID:1400763

Hu, Jinping ^[1]; Sharp, Thomas G. ^[1]

School of Earth and Space Exploration Arizona State University Tempe Arizona 85287–1404 USA

Abstract Northwest Africa 757 is unique in the LL chondrite group because of its abundant shock‐induced melt and high‐pressure minerals. Olivine fragments entrained in the melt transform partially and completely into ringwoodite. Plagioclase and Ca‐phosphate transform to maskelynite, lingunite, and tuite. Two distinct shock‐melt crystallization assemblages were studied by FIB ‐ TEM analysis. The first melt assemblage, which includes majoritic garnet, ringwoodite plus magnetite‐magnesiowüstite, crystallized at pressures of 20–25 GP a. The other melt assemblage, which consists of clinopyroxene and wadsleyite, solidified at ~15 GP a, suggesting a second veining event under lower pressure conditions. These shock features are similar to those in S6 L chondrites and indicate that NWA 757 experienced an intense impact event, comparable to the impact event that disrupted the L chondrite parent body at 470 Ma.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐FG02‐94ER14466

OSTI ID:: 1400763

Journal Information:: Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Vol. 51 Journal Issue: 7; ISSN 1086-9379

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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