Majorite-olivine–high-Ca pyroxene assemblage in the shock-melt veins of Pervomaisky L6 chondrite

Bazhan, I. S.; Litasov, Konstantin D.; Ohtani, Eiji; Ozawa, Seiji

doi:10.2138/am-2017-5892

Cited by 8 publications

(9 citation statements)

References 52 publications

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“…It is likely an ill-defined exercise to attempt to state a single global peak P or T condition for the meteorite, much less for the maximum conditions experienced anywhere on the parent body during the associated impact event. Nevertheless, the conditions are within the range inferred from studies of HP phases, melt veins, and textures, in other L6 chondrites 16 , 18 , 20 , 39 , 42 – 46 .…”

Section: Discussionsupporting

confidence: 58%

“…Although dating of shock events can be challenging because they may only partially reset some radiometric systems, it is widely agreed on the basis of numerous studies that many L chondrites preserve a record of a strong shock at ~ 470 Ma 24 , 25 , 66 – 68 , commonly associated with shock darkening, formation of melt veins, and creation of HP minerals. For example, the meteorites Peace River, Taiban, Mbale, and Sixiangkou include the above shock-related features 12 , 25 , 43 – 46 , 65 , 69 , 70 . This event is so ubiquitous among L-chondrites that it is generally presumed to represent the age of catastrophic disruption of the L-chondrite parent body 24 , 25 , 71 .…”

Section: Discussionmentioning

confidence: 99%

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Unique evidence of fluid alteration in the Kakowa (L6) ordinary chondrite

Baziotis

Guan

et al. 2022

Sci Rep

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Meteorites preserve evidence of processes on their parent bodies, including alteration, metamorphism, and shock events. Here we show that the Kakowa (L6) ordinary chondrite (OC) preserves both shock-melt veins and pockets of detrital grains from a brecciated and altered object, including corundum, albite, silica, fayalite, forsterite, and margarite in a Pb- and Fe-rich matrix. Preservation of the observed mineralogy and texture requires a sequence of at least two impacts: first, a high-velocity collision formed the shock melt veins containing the high-pressure minerals ringwoodite, wadsleyite, majorite, and albitic jadeite; later, a low-velocity impact formed fractures and filled them with the detrital material. Oxygen and Pb isotope ratios suggest an OC origin for these detrital minerals. Although fluid alteration is common in carbonaceous chondrites, the discovery of margarite with an OC oxygen isotopic signature is novel. Kakowa extends both the impact and alteration history of L6 ordinary chondrites in general.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Unique evidence of fluid alteration in the Kakowa (L6) ordinary chondrite

Baziotis

Guan

et al. 2022

Sci Rep

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“…(), 55 Bazhan et al. (), 56 Bischoff (), 57 Hu and Sharp (), 58 Kimura et al. (), 59 Weisberg and Kimura (), 60 Miyahara et al.…”

Section: High‐pressure Polymorphs Of Olivineunclassified

High‐pressure minerals in shocked meteorites

Tomioka

Miyahara

2017

Meteorit & Planetary Scien

106

101

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Heavily shocked meteorites contain various types of high-pressure polymorphs of major minerals (olivine, pyroxene, feldspar, and quartz) and accessory minerals (chromite and Ca phosphate). These high-pressure minerals are micron to submicron sized and occur within and in the vicinity of shock-induced melt veins and melt pockets in chondrites and lunar, howardite-eucrite-diogenite (HED), and Martian meteorites. Their occurrence suggests two types of formation mechanisms (1) solid-state high-pressure transformation of the host-rock minerals into monomineralic polycrystalline aggregates, and (2) crystallization of chondritic or monomineralic melts under high pressure. Based on experimentally determined phase relations, their formation pressures are limited to the pressure range up tõ 25 GPa. Textural, crystallographic, and chemical characteristics of high-pressure minerals provide clues about the impact events of meteorite parent bodies, including their size and mutual collision velocities and about the mineralogy of deep planetary interiors. The aim of this article is to review and summarize the findings on natural high-pressure minerals in shocked meteorites that have been reported over the past 50 years. 2017

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“…The dashed box marks the location of the extracted FIB section (see Figure 7). eskolaite (Ca-Esk), and anorthite (An), as well as jadeite, tissintite, and albitic jadeite analyses from the literature (Ma et al 2020(Ma et al , 2021Bazhan et al 2017a;Ozawa et al 2014;Miyahara et al 2017;Baziotis et al 2018;Bazhan et al 2017b;Martinez et al 2019;Miyahara et al 2013;Ohtani et al 2006;Ozawa et al 2009;Zhang et al 2006) typical for jadeite (Jd; reference spectrum R050220 from RRUFF database shown). The highwavenumber range of Tissintite (Tis) spectra, by contrast, has a single broad peak centered at ~1000 cm -1 (Ma et al 2015).…”

Section: Discussionmentioning

confidence: 99%