Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology
Whole-rock Pb isotopic signatures and U/Pb geochronology refute a Rodinian correlation of northeastern Laurentia and proto-Andean Amazonia. According to this previously proposed model, the Labrador-Scotland-Greenland Promontory (LSGP) of northeastern Laurentia collided with the proto-Andean margin o...
Published in: | Tectonophysics |
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Language: | English |
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2003
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Online Access: | https://curis.ku.dk/portal/da/publications/eastern-laurentia-in-rodinia(ae378169-75eb-46fb-982b-3713faa0f26c).html https://doi.org/10.1016/S0040-1951(03)00338-X http://www.scopus.com/inward/record.url?scp=0242658747&partnerID=8YFLogxK |
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ftcopenhagenunip:oai:pure.atira.dk:publications/ae378169-75eb-46fb-982b-3713faa0f26c 2023-05-15T16:30:03+02:00 Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology Loewy, Staci L. Connelly, James N. Dalziel, Ian W.D. Gower, Charles F. 2003-11-06 https://curis.ku.dk/portal/da/publications/eastern-laurentia-in-rodinia(ae378169-75eb-46fb-982b-3713faa0f26c).html https://doi.org/10.1016/S0040-1951(03)00338-X http://www.scopus.com/inward/record.url?scp=0242658747&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Loewy , S L , Connelly , J N , Dalziel , I W D & Gower , C F 2003 , ' Eastern Laurentia in Rodinia : Constraints from whole-rock Pb and U/Pb geochronology ' , Tectonophysics , vol. 375 , no. 1-4 , pp. 169-197 . https://doi.org/10.1016/S0040-1951(03)00338-X Amazonia Arequipa-Antofalla Basement Common lead Laurentia Rodinia U/Pb article 2003 ftcopenhagenunip https://doi.org/10.1016/S0040-1951(03)00338-X 2023-02-01T23:54:39Z Whole-rock Pb isotopic signatures and U/Pb geochronology refute a Rodinian correlation of northeastern Laurentia and proto-Andean Amazonia. According to this previously proposed model, the Labrador-Scotland-Greenland Promontory (LSGP) of northeastern Laurentia collided with the proto-Andean margin of Amazonia, at the Arica Embayment, during the Grenville/Sunsás Orogeny (ca. 1.0 Ga). Links between the two margins were based upon the correlation of the LSGP with Arequipa-Antofalla Basement (AAB), a Proterozoic block along the proto-Andean margin of Amazonia adjacent to the Arica Embayment. Specifically, similarities in 1.8-1.0 Ga basement rocks in both regions suggested that the AAB was originally a piece of the LSGP. Furthermore, similarities in unique, post-collisional, but pre-rift, glacial sedimentary sequences also supported a link between the AAB and LSGP. Tests of these apparent similarities fail to support correlation of the AAB and the LSGP and, thus, eliminate a direct link between northeastern Laurentia and southwestern Amazonia in Rodinia. However, Pb isotopic compositions and U/Pb geochronology provide the basis for two new correlations, namely, (1) the ca. 1.3-1.0 Ga basement in the central and southern Appalachians may be an allochthonous block that was transferred to Laurentia from Amazonia at ca. 1.0 Ga, and (2) an allochthonous AAB may be a piece of the Kalahari Craton that was transferred to Amazonia at ca. 1.0 Ga. Based on these new correlations and a previously proposed Grenvillian connection between southern Laurentia (Llano) and Kalahari, we propose that Amazonia may have collided with a contiguous southeastern Laurentia/Kalahari margin at ca. 1.0 Ga. Article in Journal/Newspaper Greenland University of Copenhagen: Research Greenland Tectonophysics 375 1-4 169 197 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Amazonia Arequipa-Antofalla Basement Common lead Laurentia Rodinia U/Pb |
spellingShingle |
Amazonia Arequipa-Antofalla Basement Common lead Laurentia Rodinia U/Pb Loewy, Staci L. Connelly, James N. Dalziel, Ian W.D. Gower, Charles F. Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology |
topic_facet |
Amazonia Arequipa-Antofalla Basement Common lead Laurentia Rodinia U/Pb |
description |
Whole-rock Pb isotopic signatures and U/Pb geochronology refute a Rodinian correlation of northeastern Laurentia and proto-Andean Amazonia. According to this previously proposed model, the Labrador-Scotland-Greenland Promontory (LSGP) of northeastern Laurentia collided with the proto-Andean margin of Amazonia, at the Arica Embayment, during the Grenville/Sunsás Orogeny (ca. 1.0 Ga). Links between the two margins were based upon the correlation of the LSGP with Arequipa-Antofalla Basement (AAB), a Proterozoic block along the proto-Andean margin of Amazonia adjacent to the Arica Embayment. Specifically, similarities in 1.8-1.0 Ga basement rocks in both regions suggested that the AAB was originally a piece of the LSGP. Furthermore, similarities in unique, post-collisional, but pre-rift, glacial sedimentary sequences also supported a link between the AAB and LSGP. Tests of these apparent similarities fail to support correlation of the AAB and the LSGP and, thus, eliminate a direct link between northeastern Laurentia and southwestern Amazonia in Rodinia. However, Pb isotopic compositions and U/Pb geochronology provide the basis for two new correlations, namely, (1) the ca. 1.3-1.0 Ga basement in the central and southern Appalachians may be an allochthonous block that was transferred to Laurentia from Amazonia at ca. 1.0 Ga, and (2) an allochthonous AAB may be a piece of the Kalahari Craton that was transferred to Amazonia at ca. 1.0 Ga. Based on these new correlations and a previously proposed Grenvillian connection between southern Laurentia (Llano) and Kalahari, we propose that Amazonia may have collided with a contiguous southeastern Laurentia/Kalahari margin at ca. 1.0 Ga. |
format |
Article in Journal/Newspaper |
author |
Loewy, Staci L. Connelly, James N. Dalziel, Ian W.D. Gower, Charles F. |
author_facet |
Loewy, Staci L. Connelly, James N. Dalziel, Ian W.D. Gower, Charles F. |
author_sort |
Loewy, Staci L. |
title |
Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology |
title_short |
Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology |
title_full |
Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology |
title_fullStr |
Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology |
title_full_unstemmed |
Eastern Laurentia in Rodinia:Constraints from whole-rock Pb and U/Pb geochronology |
title_sort |
eastern laurentia in rodinia:constraints from whole-rock pb and u/pb geochronology |
publishDate |
2003 |
url |
https://curis.ku.dk/portal/da/publications/eastern-laurentia-in-rodinia(ae378169-75eb-46fb-982b-3713faa0f26c).html https://doi.org/10.1016/S0040-1951(03)00338-X http://www.scopus.com/inward/record.url?scp=0242658747&partnerID=8YFLogxK |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Loewy , S L , Connelly , J N , Dalziel , I W D & Gower , C F 2003 , ' Eastern Laurentia in Rodinia : Constraints from whole-rock Pb and U/Pb geochronology ' , Tectonophysics , vol. 375 , no. 1-4 , pp. 169-197 . https://doi.org/10.1016/S0040-1951(03)00338-X |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0040-1951(03)00338-X |
container_title |
Tectonophysics |
container_volume |
375 |
container_issue |
1-4 |
container_start_page |
169 |
op_container_end_page |
197 |
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1766019759682355200 |