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A structural study of the occurrence of Ikaite pseudomorphs in Neoproterozoic metalimestones on Islay, Scotland
Stockholm University, Faculty of Science, Department of Geological Sciences.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Aligned ikaite porphyroblasts have been replaced by calcite with a maximum volume decrease of ~88% in Neoproterozoic Dalradian metalimestone exposed near Ballygrant on Islay, Scotland. Microscopic and structural analyses reveal that the ikaite minerals formed before deformation, at a time when Scotland was located at the lower latitudes, thus indicating a cold climate at the time of formation. The Ballygrant metalimestone underlies a ~900 meter thick glacial deposit that has previously been linked to the ‘Snowball Earth’ hypothesis. The discovery of these ikaite pseudomorphs below the glacial deposit points toward a relatively slow cooling of the climate near the equator reflecting a transition toward a ‘normal’ glacial period and thus refutes a suggested ‘Snowball Earth’ event, which is reported to reflect a more abrupt switch over from warm to cold climate in the sediment record.

Place, publisher, year, edition, pages
2017. , 28 p.
Keyword [en]
ikaite, Neoproterozoic, metalimestone, Islay, Scotland
National Category
Natural Sciences Earth and Related Environmental Sciences Geology
Identifiers
URN: urn:nbn:se:su:diva-145322OAI: oai:DiVA.org:su-145322DiVA: diva2:1128480
Presentation
2017-05-24, Ahlmannsalen, 13:00 (English)
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Examiners
Available from: 2017-11-06 Created: 2017-07-26 Last updated: 2017-11-06Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
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Output format
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