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Ice-rafting in lakes in the early Neoproterozoic: dropstones in the Diabaig Formation, Torridon Group, NW Scotland

View ORCID ProfileAdrian Hartley, View ORCID ProfileBartosz Kurjanski, Jessica Pugsley and View ORCID ProfileJoseph Armstrong
Scottish Journal of Geology, 56, 47-53, 10 January 2020, https://doi.org/10.1144/sjg2019-017
Adrian Hartley
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Adrian Hartley
  • For correspondence: a.hartley@abdn.ac.uk
Bartosz Kurjanski
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Bartosz Kurjanski
Jessica Pugsley
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
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Joseph Armstrong
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
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Abstract

A dropstone horizon is described from lake deposits in a palaeo-valley from the c. 1000 Ma Diabaig Formation, Torridon Group, NW Scotland. Dropstones occur in wave-rippled, fine-grained sandstones and siltstones that contain desiccation and syneresis cracks indicative of fluctuating lake levels. Five locally derived dropstones occur at the same horizon over lateral distance of 250 m and display clear evidence of deflection and penetration of laminae at the base, with thinning, onlap and draping of laminae on to clast margins and tops. Mechanisms of dropstone formation are discussed, with ice-rafting considered the most likely explanation. It is suggested that rafting was promoted by cold winters at 35° S in the early Neoproterozoic, possibly in an upland setting. Interpretation of the dropstones as ice-rafted debris provides the first physical record of evidence for ice at the Earth's surface during the late Mesoproterozoic to early Neoproterozoic.

  • © 2020 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved
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Scottish Journal of Geology: 56 (1)
Scottish Journal of Geology
Volume 56, Issue 1
May 2020
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Ice-rafting in lakes in the early Neoproterozoic: dropstones in the Diabaig Formation, Torridon Group, NW Scotland

Adrian Hartley, Bartosz Kurjanski, Jessica Pugsley and Joseph Armstrong
Scottish Journal of Geology, 56, 47-53, 10 January 2020, https://doi.org/10.1144/sjg2019-017
Adrian Hartley
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Adrian Hartley
  • For correspondence: a.hartley@abdn.ac.uk
Bartosz Kurjanski
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Bartosz Kurjanski
Jessica Pugsley
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Joseph Armstrong
Department of Geology & Geophysics, University of Aberdeen, Aberdeen AB24 3UE, UK
Roles: [Conceptualization (Equal)], [Investigation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Joseph Armstrong

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Ice-rafting in lakes in the early Neoproterozoic: dropstones in the Diabaig Formation, Torridon Group, NW Scotland

Adrian Hartley, Bartosz Kurjanski, Jessica Pugsley and Joseph Armstrong
Scottish Journal of Geology, 56, 47-53, 10 January 2020, https://doi.org/10.1144/sjg2019-017
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