A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent.
The positions of Laurentia and other landmasses in the Precambrian supercontinent of Rodinia are controversial. Although geological and isotopic data support an East Antarctic fit with western Laurentia, alternative reconstructions favor the juxtaposition of Australia, Siberia, or South China. New g...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/36492 2023-05-15T13:57:36+02:00 A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. Goodge, John W Vervoort, J.D. Fanning, Christopher Brecke, D.M. Farmer, G.L. Williams, Ian Myrow, Paul M DePaolo, Donald 2015-12-08T22:40:26Z http://hdl.handle.net/1885/36492 unknown American Association for the Advancement of Science 0036-8075 http://hdl.handle.net/1885/36492 Science Keywords: hafnium isotope neodymium uranium zirconium craton geochemistry geology granite Laurentia Precambrian supercontinent uranium-lead dating zircon Antarctica article Australia chemical composition China geochemical analysis geo Journal article 2015 ftanucanberra 2015-12-28T23:25:20Z The positions of Laurentia and other landmasses in the Precambrian supercontinent of Rodinia are controversial. Although geological and isotopic data support an East Antarctic fit with western Laurentia, alternative reconstructions favor the juxtaposition of Australia, Siberia, or South China. New geologic, age, and isotopic data provide a positive test of the juxtaposition with East Antarctica: Neodymium isotopes of Neoproterozoic rift-margin strata are similar; hafnium isotopes of ∼1.4-billion-year-old Antarctic-margin detrital zircons match those in Laurentian granites of similar age; and a glacial clast of A-type granite has a uraniun-lead zircon age of ∼1440 million years, an epsilon-hafnium initial value of +7, and an epsilon-neodymium initial value of +4. These tracers indicate the presence of granites in East Antarctica having the same age, geochemical properties, and isotopic signatures as the distinctive granites in Laurentia. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Siberia Australian National University: ANU Digital Collections Antarctic East Antarctica |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
unknown |
topic |
Keywords: hafnium isotope neodymium uranium zirconium craton geochemistry geology granite Laurentia Precambrian supercontinent uranium-lead dating zircon Antarctica article Australia chemical composition China geochemical analysis geo |
spellingShingle |
Keywords: hafnium isotope neodymium uranium zirconium craton geochemistry geology granite Laurentia Precambrian supercontinent uranium-lead dating zircon Antarctica article Australia chemical composition China geochemical analysis geo Goodge, John W Vervoort, J.D. Fanning, Christopher Brecke, D.M. Farmer, G.L. Williams, Ian Myrow, Paul M DePaolo, Donald A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. |
topic_facet |
Keywords: hafnium isotope neodymium uranium zirconium craton geochemistry geology granite Laurentia Precambrian supercontinent uranium-lead dating zircon Antarctica article Australia chemical composition China geochemical analysis geo |
description |
The positions of Laurentia and other landmasses in the Precambrian supercontinent of Rodinia are controversial. Although geological and isotopic data support an East Antarctic fit with western Laurentia, alternative reconstructions favor the juxtaposition of Australia, Siberia, or South China. New geologic, age, and isotopic data provide a positive test of the juxtaposition with East Antarctica: Neodymium isotopes of Neoproterozoic rift-margin strata are similar; hafnium isotopes of ∼1.4-billion-year-old Antarctic-margin detrital zircons match those in Laurentian granites of similar age; and a glacial clast of A-type granite has a uraniun-lead zircon age of ∼1440 million years, an epsilon-hafnium initial value of +7, and an epsilon-neodymium initial value of +4. These tracers indicate the presence of granites in East Antarctica having the same age, geochemical properties, and isotopic signatures as the distinctive granites in Laurentia. |
format |
Article in Journal/Newspaper |
author |
Goodge, John W Vervoort, J.D. Fanning, Christopher Brecke, D.M. Farmer, G.L. Williams, Ian Myrow, Paul M DePaolo, Donald |
author_facet |
Goodge, John W Vervoort, J.D. Fanning, Christopher Brecke, D.M. Farmer, G.L. Williams, Ian Myrow, Paul M DePaolo, Donald |
author_sort |
Goodge, John W |
title |
A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. |
title_short |
A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. |
title_full |
A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. |
title_fullStr |
A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. |
title_full_unstemmed |
A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent. |
title_sort |
positive test of east antarctica-laurentia juxtaposition within the rodinia supercontinent. |
publisher |
American Association for the Advancement of Science |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/36492 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Siberia |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Siberia |
op_source |
Science |
op_relation |
0036-8075 http://hdl.handle.net/1885/36492 |
_version_ |
1766265307780874240 |