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GEOREF RECORD

Climatic cycles during a Neoproterozoic "snowball" glacial epoch

Ruben Rieu, Philip A. Allen, Michael Ploetze and Thomas Pettke
Climatic cycles during a Neoproterozoic "snowball" glacial epoch
Geology (Boulder) (April 2007) 35 (4): 299-302

Abstract

The profound glaciations of the Neoproterozoic Cryogenian period (ca. 850-544 Ma) represent an extreme climatic mode when, it is claimed, Earth was fully or almost completely covered with ice for millions of years. We show that the geochemistry and mineralogy of fine-grained Neoproterozoic sedimentary rocks in Oman are best explained by climatic oscillations that drove variations in the intensity of chemical weathering on contemporary land surfaces. The cold climate modes of the Cryogenian were therefore cyclical, punctuated with well-defined warm-humid interglacial periods. The hydrological cycle and the routing of sediment were active throughout the glacial epoch, which requires substantial open ocean water. This reconstruction represents a significantly different target for numerical climate models at this critical time in the evolution of Earth's biosphere.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 35
Serial Issue: 4
Title: Climatic cycles during a Neoproterozoic "snowball" glacial epoch
Affiliation: Repsol YPF, Exploration & Production, Madrid, Spain
Pages: 299-302
Published: 200704
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2007-037412
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2007074; for discussion see Lorentz, Nathaniel J., and Corsetti, Frank A., Geology, Vol. 35, p. 383-384, 2007
Illustration Description: illus. incl. sects., geol. sketch map
N17°00'00" - N27°00'00", E52°30'00" - E60°00'00"
Secondary Affiliation: Imperial College London, GBR, United KingdomETH-Zuerich, CHE, SwitzerlandUniversity of Berne, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200720
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