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Article: Major shoreline retreat and sediment starvation following Snowball Earth

TitleMajor shoreline retreat and sediment starvation following Snowball Earth
Authors
Issue Date2019
PublisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121
Citation
Terra Nova, 2019, v. 31 n. 6, p. 495-502 How to Cite?
AbstractWhile cap dolostones are integral to the Snowball Earth hypothesis, the current depositional model does not account for multiple geological observations. Here we propose a model that rationalises palaeomagnetic, sequence-stratigraphic and sedimentological data and supports rapid deglaciation with protracted cap dolostone precipitation. The Snowball Earth hypothesis posits that a runaway ice-albedo can explain the climate paradox of Neoproterozoic glacial deposits occurring at low palaeolatitudes. This scenario invokes volcanic degassing to increase atmospheric greenhouse gases to a critical threshold that overcomes the albedo effect and brings the planet back from the ice-covered state. Once this occurs, Earth should shift rapidly from a snowball to an extreme greenhouse. However, cap dolostone units overlying glacial sediments, typically interpreted as transgressive deposits, exhibit multiple magnetic reversals indicating they accumulated in >105 years. By reviewing modern post-glacial systems, sequence stratigraphic concepts and principles of sedimentology, we suggest that cap dolostones are not restricted to the transgression but rather represent sediment starvation following a major landward shoreline migration associated with the demise of Snowball Earth. Thus, the duration in which cap dolostone accumulated is not directly coupled to the timescale of the Snowball Earth deglaciation.
Persistent Identifierhttp://hdl.handle.net/10722/308379
ISSN
2023 Impact Factor: 2.2
2023 SCImago Journal Rankings: 1.019
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorNordsvan, AR-
dc.contributor.authorBarham, M-
dc.contributor.authorCox, G-
dc.contributor.authorKirscher, U-
dc.contributor.authorMitchell, RN-
dc.date.accessioned2021-12-01T07:52:33Z-
dc.date.available2021-12-01T07:52:33Z-
dc.date.issued2019-
dc.identifier.citationTerra Nova, 2019, v. 31 n. 6, p. 495-502-
dc.identifier.issn0954-4879-
dc.identifier.urihttp://hdl.handle.net/10722/308379-
dc.description.abstractWhile cap dolostones are integral to the Snowball Earth hypothesis, the current depositional model does not account for multiple geological observations. Here we propose a model that rationalises palaeomagnetic, sequence-stratigraphic and sedimentological data and supports rapid deglaciation with protracted cap dolostone precipitation. The Snowball Earth hypothesis posits that a runaway ice-albedo can explain the climate paradox of Neoproterozoic glacial deposits occurring at low palaeolatitudes. This scenario invokes volcanic degassing to increase atmospheric greenhouse gases to a critical threshold that overcomes the albedo effect and brings the planet back from the ice-covered state. Once this occurs, Earth should shift rapidly from a snowball to an extreme greenhouse. However, cap dolostone units overlying glacial sediments, typically interpreted as transgressive deposits, exhibit multiple magnetic reversals indicating they accumulated in >105 years. By reviewing modern post-glacial systems, sequence stratigraphic concepts and principles of sedimentology, we suggest that cap dolostones are not restricted to the transgression but rather represent sediment starvation following a major landward shoreline migration associated with the demise of Snowball Earth. Thus, the duration in which cap dolostone accumulated is not directly coupled to the timescale of the Snowball Earth deglaciation.-
dc.languageeng-
dc.publisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121-
dc.relation.ispartofTerra Nova-
dc.rightsSubmitted (preprint) Version This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Accepted (peer-reviewed) Version This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.-
dc.titleMajor shoreline retreat and sediment starvation following Snowball Earth-
dc.typeArticle-
dc.identifier.emailNordsvan, AR: nordsvan@hku.hk-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/ter.12426-
dc.identifier.scopuseid_2-s2.0-85074299401-
dc.identifier.hkuros330547-
dc.identifier.volume31-
dc.identifier.issue6-
dc.identifier.spage495-
dc.identifier.epage502-
dc.identifier.isiWOS:000490085300001-
dc.publisher.placeUnited Kingdom-

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