Show simple item record

dc.contributor.authorLiu, Alexanderen
dc.date.accessioned2019-02-13T00:30:18Z
dc.date.available2019-02-13T00:30:18Z
dc.date.issued2016-05-01en
dc.identifier.issn0883-1351
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/289306
dc.description.abstractCopyright © 2016, SEPM (Society for Sedimentary Geology). The mechanisms by which soft-bodied organisms were preserved in late Ediacaran deep-marine environments are revealed by petrographic and geochemical investigation of fossil-bearing surfaces from the Conception and St. John's groups (Newfoundland, Canada). Framboidal pyrite veneers are documented on fossilbearing horizons at multiple localities. The pyrite is interpreted to have formed via microbial processes in the hours to weeks following burial of benthic communities. This finding extends the 'death mask' model for Ediacaran soft-tissue preservation to deep-marine settings. Remineralization of pyrite to iron oxides and oxyhydroxides is recognized to result from recent oxidation by meteoric fluids in the shallow subsurface. Consideration of other global Ediacaran macrofossil occurrences reveals that pyrite is observed in association with Ediacaran macrofossils preserved in all four previously described styles of moldic preservation (Flinders-, Conception-, Fermeuse- and Nama-type). This suggests that replication of external morphology by framboidal pyrite was a widespread mechanism by which softbodied organisms and associated organic surfaces were preserved, in multiple facies and depositional environments, 580-541 million years ago. The extensive global burial of pyrite in medium- to coarse-grained clastics and carbonates is a previously unrecognized yet potentially significant geological sink of iron and sulfur, and may have contributed to rising atmospheric and marine oxygen concentrations across the late Ediacaran interval.
dc.titleFramboidal pyrite shroud confirms the 'death mask' model for moldic preservation of ediacaran soft-bodied organismsen
dc.typeArticle
prism.issueIdentifier5en
prism.publicationDate2016en
prism.publicationNamePalaiosen
prism.volume31en
dc.identifier.doi10.17863/CAM.36555
dcterms.dateAccepted2016-03-23en
rioxxterms.versionofrecord10.2110/palo.2015.095en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2016-05-01en
dc.contributor.orcidLiu, Alexander [0000-0002-3985-982X]
dc.identifier.eissn1938-5323
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idNatural Environment Research Council (NE/L011409/2)
cam.issuedOnline2016-05-01en
rioxxterms.freetoread.startdate2017-05-01


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record