Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications
Early Triassic paleobiogeography is characterised by the stable supercontinental assembly of Pangea. However, at that time, several terranes such as the South Kitakami Massif (SK), South Primorye (SP) and Chulitna (respectively, and presently located in Japan, eastern Russia and Alaska) straddled th...
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ftunivzuerich:oai:www.zora.uzh.ch:7120 2024-09-09T20:14:10+00:00 Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications Brayard, A Escarguel, G Bucher, H Brühwiler, T 2009-05-25 application/pdf https://www.zora.uzh.ch/id/eprint/7120/ https://www.zora.uzh.ch/id/eprint/7120/12/Brayard_smithian-1.pdf https://doi.org/10.5167/uzh-7120 https://doi.org/10.1016/j.jseaes.2008.05.004 eng eng Elsevier https://www.zora.uzh.ch/id/eprint/7120/12/Brayard_smithian-1.pdf doi:10.5167/uzh-7120 doi:10.1016/j.jseaes.2008.05.004 urn:issn:1367-9120 info:eu-repo/semantics/restrictedAccess Brayard, A; Escarguel, G; Bucher, H; Brühwiler, T (2009). Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications. Journal of Asian Earth Sciences, 36(6):420-433. Department of Paleontology 560 Fossils & prehistoric life Journal Article PeerReviewed info:eu-repo/semantics/article 2009 ftunivzuerich https://doi.org/10.5167/uzh-712010.1016/j.jseaes.2008.05.004 2024-08-06T23:54:53Z Early Triassic paleobiogeography is characterised by the stable supercontinental assembly of Pangea. However, at that time, several terranes such as the South Kitakami Massif (SK), South Primorye (SP) and Chulitna (respectively, and presently located in Japan, eastern Russia and Alaska) straddled the vast oceans surrounding Pangea. By means of quantitative biogeographical methods including Cluster Analysis, Non-metric Multidimensional Scaling and Bootstrapped Spanning Network applied to Smithian and Spathian (Early Triassic) ammonoid assemblages; we analyze similarity relationships between faunas and suggest paleopositions for the above-cited terranes. Taxonomic similarities between faunas indicate that primary drivers of the ammonoid distribution were Sea Surface Temperature and currents. Possible connections due to current-controlled faunal exchanges between both sides of the Panthalassa are shown and terranes such as SK, SP and Chulitna played an important role as stepping stones in the dispersal of ammonoids. SK and SP terranes show strong sub-equatorial affinities during the Smithian, thus suggesting a location close to South China. At the same time, the Chulitna terrane shows strong affinities with equatorial faunas of the eastern Panthalassa. This paleoceanographic pattern was markedly altered during the Spathian, possibly indicating significant modifications of oceanic circulation at that time, as illustrated by the development of a marked intertropical faunal belt across Tethys and Panthalassa. Article in Journal/Newspaper Alaska Stepping Stones University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Stepping Stones ENVELOPE(-63.992,-63.992,-64.786,-64.786) |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Department of Paleontology 560 Fossils & prehistoric life |
spellingShingle |
Department of Paleontology 560 Fossils & prehistoric life Brayard, A Escarguel, G Bucher, H Brühwiler, T Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
topic_facet |
Department of Paleontology 560 Fossils & prehistoric life |
description |
Early Triassic paleobiogeography is characterised by the stable supercontinental assembly of Pangea. However, at that time, several terranes such as the South Kitakami Massif (SK), South Primorye (SP) and Chulitna (respectively, and presently located in Japan, eastern Russia and Alaska) straddled the vast oceans surrounding Pangea. By means of quantitative biogeographical methods including Cluster Analysis, Non-metric Multidimensional Scaling and Bootstrapped Spanning Network applied to Smithian and Spathian (Early Triassic) ammonoid assemblages; we analyze similarity relationships between faunas and suggest paleopositions for the above-cited terranes. Taxonomic similarities between faunas indicate that primary drivers of the ammonoid distribution were Sea Surface Temperature and currents. Possible connections due to current-controlled faunal exchanges between both sides of the Panthalassa are shown and terranes such as SK, SP and Chulitna played an important role as stepping stones in the dispersal of ammonoids. SK and SP terranes show strong sub-equatorial affinities during the Smithian, thus suggesting a location close to South China. At the same time, the Chulitna terrane shows strong affinities with equatorial faunas of the eastern Panthalassa. This paleoceanographic pattern was markedly altered during the Spathian, possibly indicating significant modifications of oceanic circulation at that time, as illustrated by the development of a marked intertropical faunal belt across Tethys and Panthalassa. |
format |
Article in Journal/Newspaper |
author |
Brayard, A Escarguel, G Bucher, H Brühwiler, T |
author_facet |
Brayard, A Escarguel, G Bucher, H Brühwiler, T |
author_sort |
Brayard, A |
title |
Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
title_short |
Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
title_full |
Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
title_fullStr |
Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
title_full_unstemmed |
Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
title_sort |
smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications |
publisher |
Elsevier |
publishDate |
2009 |
url |
https://www.zora.uzh.ch/id/eprint/7120/ https://www.zora.uzh.ch/id/eprint/7120/12/Brayard_smithian-1.pdf https://doi.org/10.5167/uzh-7120 https://doi.org/10.1016/j.jseaes.2008.05.004 |
long_lat |
ENVELOPE(-63.992,-63.992,-64.786,-64.786) |
geographic |
Stepping Stones |
geographic_facet |
Stepping Stones |
genre |
Alaska Stepping Stones |
genre_facet |
Alaska Stepping Stones |
op_source |
Brayard, A; Escarguel, G; Bucher, H; Brühwiler, T (2009). Smithian and spathian (early triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications. Journal of Asian Earth Sciences, 36(6):420-433. |
op_relation |
https://www.zora.uzh.ch/id/eprint/7120/12/Brayard_smithian-1.pdf doi:10.5167/uzh-7120 doi:10.1016/j.jseaes.2008.05.004 urn:issn:1367-9120 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5167/uzh-712010.1016/j.jseaes.2008.05.004 |
_version_ |
1809815875333652480 |