A unifying model for Neoproterozoic–Palaeozoic exceptional fossil preservation through pyritization and carbonaceous compression

dc.contributor.authorSchiffbauer, James D.en
dc.contributor.authorXiao, Shuhaien
dc.contributor.authorCai, Yaopingen
dc.contributor.authorWallace, Adam F.en
dc.contributor.authorHua, Hongen
dc.contributor.authorHunter, Jerryen
dc.contributor.authorXu, Huifangen
dc.contributor.authorPeng, Yongboen
dc.contributor.authorKaufman, Alan J.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2017-11-13T19:43:18Zen
dc.date.available2017-11-13T19:43:18Zen
dc.date.issued2014-12-17en
dc.description.abstractSoft-tissue fossils capture exquisite biological detail and provide our clearest views onto the rise of animals across the Ediacaran–Cambrian transition. The processes contributing to fossilization of soft tissues, however, have long been a subject of debate. The Ediacaran Gaojiashan biota displays soft-tissue preservational styles ranging from pervasive pyritization to carbonaceous compression, and thus provides an excellent opportunity to dissect the relationships between these taphonomic pathways. Here geochemical analyses of the Gaojiashan fossil Conotubus hemiannulatus show that pyrite precipitation was fuelled by the degradation of labile tissues through bacterial sulfate reduction (BSR). Pyritization initiated with nucleation on recalcitrant tube walls, proceeded centripetally, decelerated with exhaustion of labile tissues and possibly continued beneath the BSR zone. We propose that pyritization and kerogenization are regulated principally by placement and duration of the decaying organism in different microbial zones of the sediment column, which hinge on post-burial sedimentation rate and/or microbial zone thickness.en
dc.description.sponsorshipThis research was supported by funding through NASA Exobiology and Evolutionary Biology Program, NASA Astrobiology Institute (N07-5489), National Science Foundation (EAR-0824890, EAR095800, EAR1124062), Chinese Academy of Sciences, National Natural Science Foundation of China (41202006; 41030209; 41272011), Chinese Ministry of Science and Technology, Virginia Tech Institute for Critical Technology and Applied Sciences and China Postdoctoral Science Foundation (2013M531410).en
dc.identifier.doihttps://doi.org/10.1038/ncomms6754en
dc.identifier.urihttp://hdl.handle.net/10919/80356en
dc.identifier.volume5en
dc.language.isoen_USen
dc.publisherNatureen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.titleA unifying model for Neoproterozoic–Palaeozoic exceptional fossil preservation through pyritization and carbonaceous compressionen
dc.title.serialNature Communicationsen
dc.typeArticle - Refereeden
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