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Duration of Sturtian "Snowball Earth" glaciation linked to exceptionally low mid-ocean ridge outgassing.

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Title: Duration of Sturtian "Snowball Earth" glaciation linked to exceptionally low mid-ocean ridge outgassing.
Authors: Dutkiewicz, Adriana1 adriana.dutkiewicz@sydney.edu.au, Merdith, Andrew S.2, Collins, Alan S.2, Mather, Ben1, Ilano, Lauren1, Zahirovic, Sabin1, Müller, R. Dietmar1
Source: Geology. Apr2024, Vol. 52 Issue 4, p292-296. 5p.
Subject Terms: *Snowball Earth (Geology), *Atmosphere, *Outgassing, *Igneous provinces, *Arc length, *Orogenic belts, *Mid-ocean ridges, *Glaciation
Abstract: The Sturtian "Snowball Earth" glaciation (ca. 717-661 Ma) is regarded as the most extreme interval of icehouse climate in Earth's history. The exact trigger and sustention mechanisms for this long-lived global glaciation remain obscure. The most widely debated causes are silicate weathering of the ca. 718 Ma Franklin large igneous province (LIP) and changes in the length and degassing of continental arcs. A new generation of two independent Neoproterozoic full-plate tectonic models now allows us to quantify the role of tectonics in initiating and sustaining the Sturtian glaciation. We find that continental arc length remains relatively constant from 850 Ma until the end of the glaciation in both models and is unlikely to play a role. The two plate motion models diverge in their predictions of the timing and progression of Rodinia break-up, ocean-basin age, ocean-basement depth, sea-level evolution, and mid-ocean ridge (MOR) carbon outflux. One model predicts MOR outflux and ocean basin volume-driven sea level lower than during the Late Cenozoic glaciation, while the other predicts outgassing and sea level exceeding those of the Late Cretaceous hothouse climate. The second model would preclude a major glaciation, while the first model implies that the trigger for the Sturtian glaciation could have been a combination of an extremely low MOR outflux (~9 Mt C/yr) and Franklin LIP weathering. Such minimal outflux could have maintained an icehouse state for 57 m.y. when silicate weathering was markedly reduced, with a gradual build-up of MOR CO2 in the atmosphere paired with terrestrial volcanism leading to its termination. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 176379633
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  Data: Duration of Sturtian "Snowball Earth" glaciation linked to exceptionally low mid-ocean ridge outgassing.
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  Data: <searchLink fieldCode="AR" term="%22Dutkiewicz%2C+Adriana%22">Dutkiewicz, Adriana</searchLink><relatesTo>1</relatesTo><i> adriana.dutkiewicz@sydney.edu.au</i><br /><searchLink fieldCode="AR" term="%22Merdith%2C+Andrew+S%2E%22">Merdith, Andrew S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Collins%2C+Alan+S%2E%22">Collins, Alan S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Mather%2C+Ben%22">Mather, Ben</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ilano%2C+Lauren%22">Ilano, Lauren</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zahirovic%2C+Sabin%22">Zahirovic, Sabin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Müller%2C+R%2E+Dietmar%22">Müller, R. Dietmar</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Geology%22">Geology</searchLink>. Apr2024, Vol. 52 Issue 4, p292-296. 5p.
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  Data: *<searchLink fieldCode="DE" term="%22Snowball+Earth+%28Geology%29%22">Snowball Earth (Geology)</searchLink><br />*<searchLink fieldCode="DE" term="%22Atmosphere%22">Atmosphere</searchLink><br />*<searchLink fieldCode="DE" term="%22Outgassing%22">Outgassing</searchLink><br />*<searchLink fieldCode="DE" term="%22Igneous+provinces%22">Igneous provinces</searchLink><br />*<searchLink fieldCode="DE" term="%22Arc+length%22">Arc length</searchLink><br />*<searchLink fieldCode="DE" term="%22Orogenic+belts%22">Orogenic belts</searchLink><br />*<searchLink fieldCode="DE" term="%22Mid-ocean+ridges%22">Mid-ocean ridges</searchLink><br />*<searchLink fieldCode="DE" term="%22Glaciation%22">Glaciation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Sturtian "Snowball Earth" glaciation (ca. 717-661 Ma) is regarded as the most extreme interval of icehouse climate in Earth's history. The exact trigger and sustention mechanisms for this long-lived global glaciation remain obscure. The most widely debated causes are silicate weathering of the ca. 718 Ma Franklin large igneous province (LIP) and changes in the length and degassing of continental arcs. A new generation of two independent Neoproterozoic full-plate tectonic models now allows us to quantify the role of tectonics in initiating and sustaining the Sturtian glaciation. We find that continental arc length remains relatively constant from 850 Ma until the end of the glaciation in both models and is unlikely to play a role. The two plate motion models diverge in their predictions of the timing and progression of Rodinia break-up, ocean-basin age, ocean-basement depth, sea-level evolution, and mid-ocean ridge (MOR) carbon outflux. One model predicts MOR outflux and ocean basin volume-driven sea level lower than during the Late Cenozoic glaciation, while the other predicts outgassing and sea level exceeding those of the Late Cretaceous hothouse climate. The second model would preclude a major glaciation, while the first model implies that the trigger for the Sturtian glaciation could have been a combination of an extremely low MOR outflux (~9 Mt C/yr) and Franklin LIP weathering. Such minimal outflux could have maintained an icehouse state for 57 m.y. when silicate weathering was markedly reduced, with a gradual build-up of MOR CO2 in the atmosphere paired with terrestrial volcanism leading to its termination. [ABSTRACT FROM AUTHOR]
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        Value: 10.1130/G51669.1
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 292
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      – SubjectFull: Snowball Earth (Geology)
        Type: general
      – SubjectFull: Atmosphere
        Type: general
      – SubjectFull: Outgassing
        Type: general
      – SubjectFull: Igneous provinces
        Type: general
      – SubjectFull: Arc length
        Type: general
      – SubjectFull: Orogenic belts
        Type: general
      – SubjectFull: Mid-ocean ridges
        Type: general
      – SubjectFull: Glaciation
        Type: general
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      – TitleFull: Duration of Sturtian "Snowball Earth" glaciation linked to exceptionally low mid-ocean ridge outgassing.
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            NameFull: Collins, Alan S.
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            – D: 01
              M: 04
              Text: Apr2024
              Type: published
              Y: 2024
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              Value: 52
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