Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res
The recent proliferation of stratigraphic studies of ~13C variation in carbonates and organic C in later Neopro-terozoic and basal Cambrian successions ( ~ 850-530 Ma) indicates a strong oscillating trend in the C-isotopic composition of surface seawater. Alone, this trend does not adequately charac...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.694.1128 2023-05-15T18:42:38+02:00 Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res Alan J. Kaufman Andrew H. Knoll The Pennsylvania State University CiteSeerX Archives 1995 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.1128 http://www.geol.umd.edu/%7Ekaufman/pdf/Kaufman_95.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.1128 http://www.geol.umd.edu/%7Ekaufman/pdf/Kaufman_95.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geol.umd.edu/%7Ekaufman/pdf/Kaufman_95.pdf text 1995 ftciteseerx 2016-01-08T18:32:43Z The recent proliferation of stratigraphic studies of ~13C variation in carbonates and organic C in later Neopro-terozoic and basal Cambrian successions ( ~ 850-530 Ma) indicates a strong oscillating trend in the C-isotopic composition of surface seawater. Alone, this trend does not adequately characterize discrete intervals in Neopro-terozoic time. However, integrated with the vectorial signals provided by fossils and Sr-isotopic variations, C isotope chemostratigraphy facilitates the interbasinal correlation of later Neoproterozoic successions. Results of these studies are evaluated interms of four stratigraphic intervals: ( 1) the Precambrian/Cambrian boundary, (2) the post-Varanger terminal Proterozoic, (3) the late Cryogenian, and (4) the early Cryogenian. Where biostrati-graphic or radiometric data constrain the age of Neoproterozoic sedimentary sequences, secular variations in C and Sr isotopes can provide a level of stratigraphic resolution exceeding that provided by fossils alone. Isotopic data place strong constraints on the chemical evolution of seawater, linking it to major tectonic and paleoclimatic events. They also provide a biogeochemical framework for the understanding of the initial radiation of macro-scopic metazoans, which is associated stratigraphically, and perhaps causally, with a global increase in the burial of organic C and a concomitant rise of atmospheric 02. 1. Text Varanger Unknown |
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The recent proliferation of stratigraphic studies of ~13C variation in carbonates and organic C in later Neopro-terozoic and basal Cambrian successions ( ~ 850-530 Ma) indicates a strong oscillating trend in the C-isotopic composition of surface seawater. Alone, this trend does not adequately characterize discrete intervals in Neopro-terozoic time. However, integrated with the vectorial signals provided by fossils and Sr-isotopic variations, C isotope chemostratigraphy facilitates the interbasinal correlation of later Neoproterozoic successions. Results of these studies are evaluated interms of four stratigraphic intervals: ( 1) the Precambrian/Cambrian boundary, (2) the post-Varanger terminal Proterozoic, (3) the late Cryogenian, and (4) the early Cryogenian. Where biostrati-graphic or radiometric data constrain the age of Neoproterozoic sedimentary sequences, secular variations in C and Sr isotopes can provide a level of stratigraphic resolution exceeding that provided by fossils alone. Isotopic data place strong constraints on the chemical evolution of seawater, linking it to major tectonic and paleoclimatic events. They also provide a biogeochemical framework for the understanding of the initial radiation of macro-scopic metazoans, which is associated stratigraphically, and perhaps causally, with a global increase in the burial of organic C and a concomitant rise of atmospheric 02. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Alan J. Kaufman Andrew H. Knoll |
spellingShingle |
Alan J. Kaufman Andrew H. Knoll Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res |
author_facet |
Alan J. Kaufman Andrew H. Knoll |
author_sort |
Alan J. Kaufman |
title |
Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res |
title_short |
Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res |
title_full |
Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res |
title_fullStr |
Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res |
title_full_unstemmed |
Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications. Precambrian Res |
title_sort |
neoproterozoic variations in the c-isotopic composition of seawater: stratigraphic and biogeochemical implications. precambrian res |
publishDate |
1995 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.1128 http://www.geol.umd.edu/%7Ekaufman/pdf/Kaufman_95.pdf |
genre |
Varanger |
genre_facet |
Varanger |
op_source |
http://www.geol.umd.edu/%7Ekaufman/pdf/Kaufman_95.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.1128 http://www.geol.umd.edu/%7Ekaufman/pdf/Kaufman_95.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766232362821091328 |