Cited by 133Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Neoproterozoic aragonite-dolomite seas? Widespread marine dolomite precipitation in Cryogenian reef complexes

Hood, Ashleigh v.S., Wallace, Malcolm W., Drysdale, Russell N.·2011·Geology

Abstract

Research Article| September 01, 2011 Neoproterozoic aragonite-dolomite seas? Widespread marine dolomite precipitation in Cryogenian reef complexes Ashleigh v.S. Hood; Ashleigh v.S. Hood 1School of Earth Sciences, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Malcolm W. Wallace; Malcolm W. Wallace 1School of Earth Sciences, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Russell N. Drysdale Russell N. Drysdale 2Department of Resource Management and Geography, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Ashleigh v.S. Hood 1School of Earth Sciences, University of Melbourne, Parkville, Victoria 3010, Australia Malcolm W. Wallace 1School of Earth Sciences, University of Melbourne, Parkville, Victoria 3010, Australia Russell N. Drysdale 2Department of Resource Management and Geography, University of Melbourne, Parkville, Victoria 3010, Australia Publisher: Geological Society of America Received: 28 Jan 2011 Revision Received: 08 Apr 2011 Accepted: 19 Apr 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (9): 871–874. https://doi.org/10.1130/G32119.1 Article history Received: 28 Jan 2011 Revision Received: 08 Apr 2011 Accepted: 19 Apr 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Ashleigh v.S. Hood, Malcolm W. Wallace, Russell N. Drysdale; Neoproterozoic aragonite-dolomite seas? Widespread marine dolomite precipitation in Cryogenian reef complexes. Geology 2011;; 39 (9): 871–874. doi: https://doi.org/10.1130/G32119.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The extraordinary abundance of dolomite in the Proterozoic challenges our understanding of Precambrian marine environments. Here we show that synsedimentary marine dolomite precipitation was pervasive within Cryogenian reef complexes from the Adelaide Fold Belt, South Australia. Although these reefs are composed of dolomite, textural evidence indicates an originally aragonitic mineralogy for depositional components, in common with many other Neoproterozoic carbonates. Allochthonous slope debris from the reefs invariably contains both limestone and dolomite clasts, indicating synsedimentary dolomitization in the reefs. We describe several new forms of fibrous marine dolomite cement from the reefs that have a length-slow optical character. These fascicular slow, radial slow, and rhombic dolomite cements have finely preserved cathodoluminescent growth zones, and optical characteristics that indicate they originally precipitated as dolomite, rather than replacing calcite or aragonite cements. Abundant early marine dolomite precipitation implies a radically different seawater chemistry for the Cryogenian. Perhaps these aragonite-dolomite seas are associated with extreme Neoproterozoic glacial events and/or ocean anoxia. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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  • A similar direct formation mechanism producing radial growth morphology has been suggested for dolomite cements in Cryogenian reef carbonates.

    “A similar 'direct' formation mechanism, which also produces a radial growth morphology, has been suggested for dolomite cements in Cryogenian ( ~ 850 to ~ 650 Mya) reef carbonates (Hood et al. 2011; Hood and Wallace 2012).”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Hood et al. 2011

  • The radial growth morphology of direct dolomite cements in Neoproterozoic cap carbonates may also be a product of spherulitic growth, indicating they may have formed from an amorphous precursor.

    “Furthermore, the radial growth morphology of the 'direct' dolomite cements in the Neoproterozoic cap carbonates may also be a product of spherulitic growth indicating that they also may have formed from an amorphous precursor (Hood et al. 2011; Hood and Wallace 2012).”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Hood et al. 2011

  • Environmental conditions that promoted direct precipitation of dolomite in Neoproterozoic seas were characterized by high alkalinities, elevated Mg:Ca ratios (>7), and high supersaturations.

    “Hood et al. (2011) and Hood and Wallace (2012) suggest that the environmental conditions that dominated and promoted the 'direct precipitation' of dolomite from solution in the Neoproterozoic seas were characterized by high alkalinities, elevated Mg:Ca ratios (>7) and high supersaturations.”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Hood et al. 2011

  • If the assertion of a 'direct' dolomite cement formation scenario is correct, the spherulitic growth mechanism could have been the controlling pathway to produce the Cryogenian cap dolomites described by Hood et al. (2011), regardless of whether their formation occurred via microbially mediated processes.

    “This leads us to infer that if the assertion of a 'direct' dolomite cement formation scenario is correct, the spherulitic growth mechanism could have been the controlling pathway to produce the Cryogenian cap dolomites described by Hood et al. (2011), regardless of whether their formation occurred via a microbially mediated processes as suggested by Font et al. (2010).”

    From A route for the direct crystallization of dolomite (2015) · cites this paper as Hood et al. 2011

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Authors
Hood, A. V. S., Wallace, M. W., & Drysdale, R. N.
Affiliations
The University of Melbourne (AU)
Venue
Geology
Published
2011-09
Volume
39
Issue
9
Pages
871-874
ISSN
  • 0091-7613 (ISSN-L)
  • 1943-2682
OpenAlex
W1972822342
Cited by
133
References
0
Citations by year
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FWCI
1.57
Type
journal article
Language
en
Open access
closed
Locations
Geology (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
Neoproterozoic, Cryogenian, aragonite, dolomite, reef complexes, carbonate geochemistry, seawater chemistry, Neoproterozoic glaciation, paleoceanography, redox conditions, Snowball Earth, Permian-Triassic boundary, carbonate diagenesis

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