Geochronology and formal stratigraphy of the Sturtian Glaciation in the Adelaide Superbasin

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dc.contributor.authorLloyd, J.C.
dc.contributor.authorPreiss, W.V.
dc.contributor.authorCollins, A.S.
dc.contributor.authorVirgo, G.M.
dc.contributor.authorBlades, M.L.
dc.contributor.authorGilbert, S.E.
dc.contributor.authorSubarkah, D.
dc.contributor.authorKrapf, C.B.E.
dc.contributor.authorAmos, K.J.
dc.date.issued2023
dc.description.abstractThe glaciogenic nature of the Yudnamutana Subgroup was first recognized over a century ago, and its global significance was recognized shortly after, with the eventual postulation of a global Sturtian Glaciation and Snowball Earth theory. Much debate on the origin and timing of these rocks, locally and globally, has ensued in the years since. A significant corpus of research on the lithology, sedimentology, geochronology and formal lithostratigraphy of these sequences globally has attempted to resolve many of these debates. In the type area for the Sturtian Glaciation, South Australia’s Adelaide Superbasin, the lithostratigraphy and sedimentology are well understood; however, formal stratigraphic nomenclature has remained complicated and contested. Absolute dates on the stratigraphy are also extremely sparse in this area. The result of these longstanding issues has been disagreement as to whether the sedimentary rocks of the Yudnamutana Subgroup are truly correlative throughout South Australia, and if they were deposited in the same time span recently defined for Sturtian glacial rocks globally, c. 717 Ma to c. 660 Ma. This study presents a large detrital zircon study, summarizes and compiles existing global geochronology for the Sturtian Glaciation and revises the formal lithostratigraphic framework of the Yudnamutana Subgroup. We show equivalence of the rocks that comprise the revised Sturt Formation, the main glaciogenic unit of the Yudnamutana Subgroup, and that it was deposited within the time span globally defined for the Sturtian Glaciation.
dc.description.statementofresponsibilityJarred C. Lloyd, Wolfgang V. Preiss, Alan S. Collins, Georgina M. Virgo, Morgan L. Blades, Sarah E. Gilbert, Darwinaji Subarkah, Carmen B.E. Krapf, and Kathryn J. Amos
dc.identifier.citationGeological Magazine, 2023; 160(7):1321-1344
dc.identifier.doi10.1017/s0016756823000390
dc.identifier.issn0016-7568
dc.identifier.issn1469-5081
dc.identifier.orcidLloyd, J.C. [0000-0002-4429-873X]
dc.identifier.orcidCollins, A.S. [0000-0002-3408-5474]
dc.identifier.orcidVirgo, G.M. [0000-0002-2628-6356]
dc.identifier.orcidGilbert, S.E. [0000-0003-3259-7983]
dc.identifier.orcidSubarkah, D. [0000-0002-9028-4232]
dc.identifier.orcidAmos, K.J. [0000-0003-0306-7588]
dc.identifier.urihttps://hdl.handle.net/2440/140662
dc.language.isoen
dc.publisherCambridge University Press (CUP)
dc.rights© The Author(s), 2023. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
dc.source.urihttps://doi.org/10.1017/s0016756823000390
dc.subjectdetrital zircon; geochronology; Sturtian; stratigraphy; provenance; tectonics; Rb-Sr geochronology
dc.titleGeochronology and formal stratigraphy of the Sturtian Glaciation in the Adelaide Superbasin
dc.typeJournal article
pubs.publication-statusPublished online

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