Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP
Paleogeography can be reconstructed using various crust- or mantle-based reference frames that make fundamentally different assumptions. The various reconstruction models differ significantly in continental paleolongitude, but it has been difficult to assess which models are more valid. We suggest h...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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CHINA UNIV GEOSCIENCES, BEIJING
2020
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| Online Access: | http://purl.org/au-research/grants/arc/FL150100133 http://hdl.handle.net/20.500.11937/90592 |
| _version_ | 1848765396874690560 |
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| author | Mitchell, Ross Wu, Lei Murphy, J. Brendan Li, Zheng-Xiang |
| author_facet | Mitchell, Ross Wu, Lei Murphy, J. Brendan Li, Zheng-Xiang |
| author_sort | Mitchell, Ross |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Paleogeography can be reconstructed using various crust- or mantle-based reference frames that make fundamentally different assumptions. The various reconstruction models differ significantly in continental paleolongitude, but it has been difficult to assess which models are more valid. We suggest here a “LLSVP test”, where an assumed correlation between present-day large low velocity shear-wave provinces and the paleogeography of supercontinent Pangea at breakup ca. 200 million years ago can be used to assess the relative accuracy of published reconstructions. Closest correlations between continental paleolongitude and the African LLSVP are achieved with mantle-based reference frames (moving hotspots and true polar wander), whereas shallower crust-based reference frames are shown to be invalid. The relative success of mantle-based frames, and thus the importance of the depth of reference frame, supports the notion that mantle convection is largely vertical compared to the horizontal plate motion of tectonics. |
| first_indexed | 2025-11-14T11:34:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-90592 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:34:36Z |
| publishDate | 2020 |
| publisher | CHINA UNIV GEOSCIENCES, BEIJING |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-905922023-03-23T01:33:26Z Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP Mitchell, Ross Wu, Lei Murphy, J. Brendan Li, Zheng-Xiang Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology Palaeogeography Plate tectonics LLSVPs Reference frames TRUE POLAR WANDER SUPERCONTINENT CYCLES MANTLE STRUCTURE VELOCITY SHEAR CONVECTION DYNAMICS HOTSPOTS TECTONICS PROVINCES Paleogeography can be reconstructed using various crust- or mantle-based reference frames that make fundamentally different assumptions. The various reconstruction models differ significantly in continental paleolongitude, but it has been difficult to assess which models are more valid. We suggest here a “LLSVP test”, where an assumed correlation between present-day large low velocity shear-wave provinces and the paleogeography of supercontinent Pangea at breakup ca. 200 million years ago can be used to assess the relative accuracy of published reconstructions. Closest correlations between continental paleolongitude and the African LLSVP are achieved with mantle-based reference frames (moving hotspots and true polar wander), whereas shallower crust-based reference frames are shown to be invalid. The relative success of mantle-based frames, and thus the importance of the depth of reference frame, supports the notion that mantle convection is largely vertical compared to the horizontal plate motion of tectonics. 2020 Journal Article http://hdl.handle.net/20.500.11937/90592 10.1016/j.gsf.2019.12.002 English http://purl.org/au-research/grants/arc/FL150100133 http://creativecommons.org/licenses/by-nc-nd/4.0/ CHINA UNIV GEOSCIENCES, BEIJING fulltext |
| spellingShingle | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology Palaeogeography Plate tectonics LLSVPs Reference frames TRUE POLAR WANDER SUPERCONTINENT CYCLES MANTLE STRUCTURE VELOCITY SHEAR CONVECTION DYNAMICS HOTSPOTS TECTONICS PROVINCES Mitchell, Ross Wu, Lei Murphy, J. Brendan Li, Zheng-Xiang Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP |
| title | Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP |
| title_full | Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP |
| title_fullStr | Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP |
| title_full_unstemmed | Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP |
| title_short | Trial by fire: Testing the paleolongitude of Pangea of competing reference frames with the African LLSVP |
| title_sort | trial by fire: testing the paleolongitude of pangea of competing reference frames with the african llsvp |
| topic | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology Palaeogeography Plate tectonics LLSVPs Reference frames TRUE POLAR WANDER SUPERCONTINENT CYCLES MANTLE STRUCTURE VELOCITY SHEAR CONVECTION DYNAMICS HOTSPOTS TECTONICS PROVINCES |
| url | http://purl.org/au-research/grants/arc/FL150100133 http://hdl.handle.net/20.500.11937/90592 |