Cuatros Amigos- the four stromatolites in a row. The first 3D image of the oldest evidence of life in the geologic record

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dc.contributor.authorDobson, Men_AU
dc.contributor.authorGarbe, Uen_AU
dc.contributor.authorCampbell, KAen_AU
dc.contributor.authorVan Kranendonk, MJen_AU
dc.contributor.authorRowe, MCen_AU
dc.date.accessioned2023-08-21T01:15:03Zen_AU
dc.date.available2023-08-21T01:15:03Zen_AU
dc.date.issued2021-11-24en_AU
dc.date.statistics2023-04-24en_AU
dc.description.abstractThe 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia provides the Earth’s most convincing evidence of early life through a diverse array of biosignatures. However, identifying biosignatures in Archean rocks is difficult due to billions of years of erosion, deformation, and metamorphic alteration. Characterisation of community-accepted biosignatures also remains challenging, particularly the robustness of textural biosignatures as indicators of early life in Archean rocks. The textural biosignatures identified in the Dresser Formation are identified in surface outcrops that are weathered. Therefore, in May 2019, fresh Dresser deposits were drilled to aid in a better understanding of these ancient biosignatures and to provide validity to a biogenic origin. Three well-preserved cores of 5-30 m thickness and 8 cm in diameter were extracted from ~70 m beneath the land surface. The cores provide excellent preservation of biosignatures, including the preservation of fossilized, pyritized, stromatolites. One stromatolite horizon within the core exhibits extraordinary morphological structures. Here we present preliminary results of the 3D geometry of these fossil stromatolites. 3D structures were obtained using the neutron imaging station DINGO at ANSTO. A full tomography of a first sample has been scanned with 1896 projection with an angular step of 0.19° and an exposure time of 60 seconds per projection. The data was reconstructed using filtered backprojection technique with Pydingo (a free in-house developed python toolbox). 3D-rendering was done with VG-Studio. This horizon aids in better defining the biogenicity of these textural biosignatures. © 2021 The Authorsen_AU
dc.identifier.articlenumber111en_AU
dc.identifier.citationDobson, M., Garbe, U., Campbell, K. A., Van Kranendonk, M. J., & Rowe, M. (2021). Cuatros Amigos- the four stromatolites in a row. The first 3D image of the oldest evidence of life in the geologic record. Retrieved from: https://events01.synchrotron.org.au/event/146/contributions/4302/contribution.pdfen_AU
dc.identifier.conferenceenddate2021-11-26en_AU
dc.identifier.conferencenameANSTO User Meeting 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-11-24en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/146/contributions/4302/contribution.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15097en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectWestern Australiaen_AU
dc.subjectRocksen_AU
dc.subjectErosionen_AU
dc.subjectMetamorphic rocksen_AU
dc.subjectGeologic depositsen_AU
dc.subjectWeatheringen_AU
dc.subjectFossilsen_AU
dc.subjectImagesen_AU
dc.subjectDrill coresen_AU
dc.subjectNeutronsen_AU
dc.titleCuatros Amigos- the four stromatolites in a row. The first 3D image of the oldest evidence of life in the geologic recorden_AU
dc.typeConference Presentationen_AU
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