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Evidence for primary aragonite precipitation, lower Proterozoic (1.9 Ga) Rocknest dolomite, Wopmay orogen, northwest Canada

Grotzinger, J. P. and Reed, J. F. (1983) Evidence for primary aragonite precipitation, lower Proterozoic (1.9 Ga) Rocknest dolomite, Wopmay orogen, northwest Canada. Geology, 11 (12). pp. 710-713. ISSN 0091-7613. https://resolver.caltech.edu/CaltechAUTHORS:20140922-140309323

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Abstract

Abundant precipitation of aragonite is suggested by well-preserved fabrics in dolostones of the lower Proterozoic (1.9 Ga) Rocknest Formation. Fabrics include dolomite and silica after botryoidal aragonite in tepee structures and seafloor cement fans, and cement crusts in cryptalgal tufas. Aragonite was common on the 1.9-Ga Rocknest shelf, as it is on modern tropical shelves. A search for similar marine cement fabrics in other Precambrian carbonates should help resolve whether aragonite was an important precipitate from Precambrian tropical seas (implying an ocean carbonate chemistry similar to today), or if aragonite precipitation was restricted to rare times in the past, calcite (and even dolomite) being the main carbonates precipitated (as recently suggested by some authors).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/0091-7613(1983)11<710:EFPAPL>2.0.CO;2 DOIArticle
http://geology.gsapubs.org/content/11/12/710PublisherArticle
http://geology.geoscienceworld.org/content/11/12/710PublisherArticle
ORCID:
AuthorORCID
Grotzinger, J. P.0000-0001-9324-1257
Additional Information:© 1983 Geological Society of America. Manuscript received March 23, 1983; Revised manuscript received August 16, 1983; Manuscript accepted August 17, 1983. Financially supported by Geological Society of America Grant 2992-82, and a grant-in-aid from Sigma Xi. We thank Paul F. Hoffman and the Geological Survey of Canada for suggesting the Rocknest Shelf project to Grotzinger, and for providing logistic support in the field. S. Dorobek assisted with the microprobe analyses.
Funders:
Funding AgencyGrant Number
Geological Society of America2992-82
Sigma XiUNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20140922-140309323
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140922-140309323
Official Citation:J. P. Grotzinger and J. F. Reed Evidence for primary aragonite precipitation, lower Proterozoic (1.9 Ga) Rocknest dolomite, Wopmay orogen, northwest Canada Geology, December, 1983, v. 11, p. 710-713, doi:10.1130/0091-7613(1983)11<710:EFPAPL>2.0.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49908
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Sep 2014 22:22
Last Modified:03 Oct 2019 07:18

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