Organic Geochemical and tectonic evolution of the Midcontinent Rift system
The older assemblages stand in contrast with the ca. 1000 Ma old Hunting Formation, Arctic Canada, which contains what may be the oldest evidence for modem algae - red algal fossils that compare closely with members of the extant family Bangiophyceae (Butterfield et al., 1990). Taken together the No...
Main Authors: | , , |
---|---|
Language: | unknown |
Published: |
2008
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/6431485 https://www.osti.gov/biblio/6431485 https://doi.org/10.2172/6431485 |
id |
ftosti:oai:osti.gov:6431485 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:6431485 2023-07-30T04:01:57+02:00 Organic Geochemical and tectonic evolution of the Midcontinent Rift system Hayes, J.M. Pratt, L.M. ) Knoll, A.H. . Dept. of Organismal and Evolutionary Biology) 2008-06-30 application/pdf http://www.osti.gov/servlets/purl/6431485 https://www.osti.gov/biblio/6431485 https://doi.org/10.2172/6431485 unknown http://www.osti.gov/servlets/purl/6431485 https://www.osti.gov/biblio/6431485 https://doi.org/10.2172/6431485 doi:10.2172/6431485 58 GEOSCIENCES ALGAE PALEONTOLOGY CORRELATIONS FOSSILS PALYNOLOGY PROGRESS REPORT RIFT ZONES STRATIGRAPHY TECTONICS USA DEVELOPED COUNTRIES DOCUMENT TYPES GEOLOGIC STRUCTURES GEOLOGY NORTH AMERICA PLANTS 2008 ftosti https://doi.org/10.2172/6431485 2023-07-11T10:48:24Z The older assemblages stand in contrast with the ca. 1000 Ma old Hunting Formation, Arctic Canada, which contains what may be the oldest evidence for modem algae - red algal fossils that compare closely with members of the extant family Bangiophyceae (Butterfield et al., 1990). Taken together the Nonesuch, Shaler, Hunting and other assemblages support the hypothesis of a major episode of eukaryotic diversification ca. 1000 Ma ago. Prior to this time, eukaryotic primary producers must have been physiologically primitive (and now extinct) algae whose abundance in ecosystems is poorly constrained by analogies with the present oceans. Cyanobacteria were major primary producers in a wide range of marine environments. After 1000 Ma, diversifying red green and chromophyte algae contributed significantly to primary production in all save microbial mat communities in restricted environments. It bears mention that such mat communities remained significant potential sources of buried organic matter until the end of the Proterozoic, necessitating exploration strategies that differ from those commonly employed for younger rocks (Knoll, in press). As in Phanerozoic basins, petroleum exploration in Proterozoic rocks requires tools for stratigraphic correlation. In Neoproterozoic (<1000 Ma) rocks, biostratigraphy is possible, and it is aided significantly by C and Sr isotopic chemostratigraphy. New data from the Shaler Group contribute to the construction of C and Sr isotopic curves for Neoproterozoic time, making possible much improved chronostratigraphy for this time interval. (Asmerom et al., 1991; Hayes et al., ms. in preparation). Other/Unknown Material Arctic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Canada Hayes ENVELOPE(-64.167,-64.167,-66.833,-66.833) |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES ALGAE PALEONTOLOGY CORRELATIONS FOSSILS PALYNOLOGY PROGRESS REPORT RIFT ZONES STRATIGRAPHY TECTONICS USA DEVELOPED COUNTRIES DOCUMENT TYPES GEOLOGIC STRUCTURES GEOLOGY NORTH AMERICA PLANTS |
spellingShingle |
58 GEOSCIENCES ALGAE PALEONTOLOGY CORRELATIONS FOSSILS PALYNOLOGY PROGRESS REPORT RIFT ZONES STRATIGRAPHY TECTONICS USA DEVELOPED COUNTRIES DOCUMENT TYPES GEOLOGIC STRUCTURES GEOLOGY NORTH AMERICA PLANTS Hayes, J.M. Pratt, L.M. ) Knoll, A.H. . Dept. of Organismal and Evolutionary Biology) Organic Geochemical and tectonic evolution of the Midcontinent Rift system |
topic_facet |
58 GEOSCIENCES ALGAE PALEONTOLOGY CORRELATIONS FOSSILS PALYNOLOGY PROGRESS REPORT RIFT ZONES STRATIGRAPHY TECTONICS USA DEVELOPED COUNTRIES DOCUMENT TYPES GEOLOGIC STRUCTURES GEOLOGY NORTH AMERICA PLANTS |
description |
The older assemblages stand in contrast with the ca. 1000 Ma old Hunting Formation, Arctic Canada, which contains what may be the oldest evidence for modem algae - red algal fossils that compare closely with members of the extant family Bangiophyceae (Butterfield et al., 1990). Taken together the Nonesuch, Shaler, Hunting and other assemblages support the hypothesis of a major episode of eukaryotic diversification ca. 1000 Ma ago. Prior to this time, eukaryotic primary producers must have been physiologically primitive (and now extinct) algae whose abundance in ecosystems is poorly constrained by analogies with the present oceans. Cyanobacteria were major primary producers in a wide range of marine environments. After 1000 Ma, diversifying red green and chromophyte algae contributed significantly to primary production in all save microbial mat communities in restricted environments. It bears mention that such mat communities remained significant potential sources of buried organic matter until the end of the Proterozoic, necessitating exploration strategies that differ from those commonly employed for younger rocks (Knoll, in press). As in Phanerozoic basins, petroleum exploration in Proterozoic rocks requires tools for stratigraphic correlation. In Neoproterozoic (<1000 Ma) rocks, biostratigraphy is possible, and it is aided significantly by C and Sr isotopic chemostratigraphy. New data from the Shaler Group contribute to the construction of C and Sr isotopic curves for Neoproterozoic time, making possible much improved chronostratigraphy for this time interval. (Asmerom et al., 1991; Hayes et al., ms. in preparation). |
author |
Hayes, J.M. Pratt, L.M. ) Knoll, A.H. . Dept. of Organismal and Evolutionary Biology) |
author_facet |
Hayes, J.M. Pratt, L.M. ) Knoll, A.H. . Dept. of Organismal and Evolutionary Biology) |
author_sort |
Hayes, J.M. |
title |
Organic Geochemical and tectonic evolution of the Midcontinent Rift system |
title_short |
Organic Geochemical and tectonic evolution of the Midcontinent Rift system |
title_full |
Organic Geochemical and tectonic evolution of the Midcontinent Rift system |
title_fullStr |
Organic Geochemical and tectonic evolution of the Midcontinent Rift system |
title_full_unstemmed |
Organic Geochemical and tectonic evolution of the Midcontinent Rift system |
title_sort |
organic geochemical and tectonic evolution of the midcontinent rift system |
publishDate |
2008 |
url |
http://www.osti.gov/servlets/purl/6431485 https://www.osti.gov/biblio/6431485 https://doi.org/10.2172/6431485 |
long_lat |
ENVELOPE(-64.167,-64.167,-66.833,-66.833) |
geographic |
Arctic Canada Hayes |
geographic_facet |
Arctic Canada Hayes |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://www.osti.gov/servlets/purl/6431485 https://www.osti.gov/biblio/6431485 https://doi.org/10.2172/6431485 doi:10.2172/6431485 |
op_doi |
https://doi.org/10.2172/6431485 |
_version_ |
1772812689469341696 |