Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa
| dc.contributor.author | Tinker, Justine H | |
| dc.contributor.author | De Wit, Maarten J | |
| dc.contributor.author | Royden, Leigh H | |
| dc.date.accessioned | 2017-03-22T09:05:31Z | |
| dc.date.available | 2017-03-22T09:05:31Z | |
| dc.date.issued | 2004 | |
| dc.date.updated | 2016-01-07T10:21:10Z | |
| dc.description.abstract | Low elastic strength of ancient lithosphere based on flexural analyses has been interpreted to reflect elevated regional geothermal gradients in response to higher global heat production in the past. Here we present a flexural analysis of Archean/Palaeoproterozoic sediment cover along the western margin of the Archaean Kaapvaal craton based on seismic stratigraphy. Our results show that between ~1.93 and ~1.75 Ga, the Archaean margin of the craton had an effective elastic thickness of 7.5 to 10km compared to its present day value of 60 to 70km. Because the Kaapvaal craton had already stabilized by ~2.7 Ga and was underlain by 150 to 300km thick strong mantle lithosphere, it is unlikely that the relatively thin elastic thickness along this old margin reflects a change in secular cooling of the Earth. Instead, we interpret the low elastic strength to be a transient marginal tectonic effect similar to that recorded along modern continental margins. | |
| dc.identifier.apacitation | Tinker, J. H., De Wit, M. J., & Royden, L. H. (2004). Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa. <i>South African Journal of Geology</i>, http://hdl.handle.net/11427/24070 | en_ZA |
| dc.identifier.chicagocitation | Tinker, Justine H, Maarten J De Wit, and Leigh H Royden "Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa." <i>South African Journal of Geology</i> (2004) http://hdl.handle.net/11427/24070 | en_ZA |
| dc.identifier.citation | Tinker, J. H., De Wit, M. J., & Royden, L. H. (2004). Old, strong continental lithosphere with weak Archaean margin at~ 1.8 Ga, Kaapvaal Craton, South Africa. South African Journal of Geology, 107(1-2), 255-260. | |
| dc.identifier.ris | TY - Journal Article AU - Tinker, Justine H AU - De Wit, Maarten J AU - Royden, Leigh H AB - Low elastic strength of ancient lithosphere based on flexural analyses has been interpreted to reflect elevated regional geothermal gradients in response to higher global heat production in the past. Here we present a flexural analysis of Archean/Palaeoproterozoic sediment cover along the western margin of the Archaean Kaapvaal craton based on seismic stratigraphy. Our results show that between ~1.93 and ~1.75 Ga, the Archaean margin of the craton had an effective elastic thickness of 7.5 to 10km compared to its present day value of 60 to 70km. Because the Kaapvaal craton had already stabilized by ~2.7 Ga and was underlain by 150 to 300km thick strong mantle lithosphere, it is unlikely that the relatively thin elastic thickness along this old margin reflects a change in secular cooling of the Earth. Instead, we interpret the low elastic strength to be a transient marginal tectonic effect similar to that recorded along modern continental margins. DA - 2004 DB - OpenUCT DO - 10.2113/107.1-2.255 DP - University of Cape Town J1 - South African Journal of Geology LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 T1 - Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa TI - Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa UR - http://hdl.handle.net/11427/24070 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/24070 | |
| dc.identifier.uri | http://dx.doi.org/10.2113/107.1-2.255 | |
| dc.identifier.vancouvercitation | Tinker JH, De Wit MJ, Royden LH. Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa. South African Journal of Geology. 2004; http://hdl.handle.net/11427/24070. | en_ZA |
| dc.language.iso | eng | |
| dc.publisher.department | Department of Geological Sciences | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.source | South African Journal of Geology | |
| dc.source.uri | http://sajg.geoscienceworld.org/ | |
| dc.title | Old, strong continental lithosphere with weak Archaean margin at - 1.8 Ga, Kaapvaal Craton, South Africa | |
| dc.type | Journal Article | en_ZA |
| uct.type.filetype | Text | |
| uct.type.filetype | Image | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Article | en_ZA |