Show simple item record

dc.contributor.authorSuttle, Martin
dc.contributor.authorDionnet, Z
dc.contributor.authorFranchi, I
dc.contributor.authorFolco, L
dc.contributor.authorGibson, J
dc.contributor.authorGreenwood, RC
dc.contributor.authorRotundi, A
dc.contributor.authorKing, A
dc.contributor.authorRussell, Sara
dc.date.accessioned2021-05-20T14:42:40Z
dc.date.available2021-05-20T14:42:40Z
dc.date.issued2020-09-15
dc.date.submitted2021-04-21
dc.identifier.citationM.D. Suttle, Z. Dionnet, I. Franchi, L. Folco, J. Gibson, R.C. Greenwood, A. Rotundi, A. King, S.S. Russell, Isotopic and textural analysis of giant unmelted micrometeorites – identification of new material from intensely altered 16O-poor water-rich asteroids, Earth and Planetary Science Letters, Volume 546, 2020, 116444, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2020.116444.en_US
dc.identifier.issn0012-821X
dc.identifier.doi10.1016/j.epsl.2020.116444
dc.identifier.urihttp://hdl.handle.net/10141/622907
dc.description.abstractBulk oxygen isotope data has the potential to match extraterrestrial samples to parent body sourcesbased on distinctive 𝛿 18O and Δ 17 O ratios. We analysed 10 giant (>500µm) micrometeorites using combined µCT and O-isotope analysis to pair internal textures to inferred parent body groups. We identify three ordinary chondrite particles (L and LL groups), four from CR chondrites and the first micrometeorite from the enstatite chondrite (EH4) group. In addition, two micrometeorites are from hydrated carbonaceous chondrite parent bodies with 16 O-poor isotopic compositions above the terrestrial fractionation line. They experienced intense aqueous alteration, contain pseudomorphic chondrules and are petrographically similar to the CM1/CR1 chondrites. These micrometeorites may be members of the newly established CY chondrites and/or derived from the enigmatic “Group 4” micrometeorite population, previously identified by Yada et al., 2005 [GCA, 69:5789-5804], Suavet et al., 2010 [EPSL, 293:313-320] (and others). One of our 16 O-poor micrometeorite plots on the same isotopic trendline as the CO, CM and CY chondrites – “the CM mixing line” (with a slope of ~0.7 and a 𝛿 17 O intercept of -4.23‰), implies a close relationship and potentially a genetic link to these hydrated chondrites. If position along the CM mixing line reflects the amount of 16 O-poor (heavy) water-ice accreted onto the parent body at formation, then the CY chondrites and these 16 O-poor micrometeorites must have accreted at least as much water-ice as CM chondrites but potentially more. In addition, thermal metamorphism could have played a role in further raising the bulk O isotope compositions through the preferential loss of isotopically light water during phyllosilicate dehydration. The study of micrometeorites provides insights into asteroid belt diversity through the discovery of material not currently sampled by larger meteorites, perhaps as a result of atmospheric entry biases preventing the survival of large blocks of friable hydrated material.en_US
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.rightsclosedAccessen_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleIsotopic and textural analysis of giant unmelted micrometeorites – identification of new material from intensely altered 16O-poor water-rich asteroidsen_US
dc.typeJournal Articleen_US
dc.identifier.eissn1385-013X
dc.identifier.journalEarth and Planetary Science Lettersen_US
dc.date.updated2021-04-21T13:04:01Z
dc.identifier.volume546en_US
dc.identifier.startpage116444-116444en_US
dc.description.nhmCopyright © 2021, Suttle MD, et al. This document is the author’s final accepted version of the journal article. You are advised to consult the published version if you wish to cite from it.en_US
dc.subject.nhmmicrometeoritesen_US
dc.subject.nhmcarbonaceous chondritesen_US
dc.subject.nhmO-isotopesen_US
dc.subject.nhmwater-to-rock ratioen_US


Files in this item

Thumbnail
Name:
Publisher version
Thumbnail
Name:
O-isotope_Giant_MMs_Accepted.pdf
Embargo:
2022-09-15
Size:
1.599Mb
Format:
PDF
Description:
Accepted version

This item appears in the following Collection(s)

Show simple item record

closedAccess
Except where otherwise noted, this item's license is described as closedAccess