New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia.
| dc.contributor.author | Frimmel, H | |
| dc.contributor.author | Klötzli, U | |
| dc.contributor.author | Siegfried, P | |
| dc.date.accessioned | 2016-07-29T10:58:20Z | |
| dc.date.available | 2016-07-29T10:58:20Z | |
| dc.date.issued | 1996 | |
| dc.date.updated | 2016-07-28T13:17:57Z | |
| dc.description.abstract | Dating of single zircons from low-grade metamorphosed rhyolites in the Rosh Pinah Formation of the Gariep Belt in southwestern Namibia, using the Pb evaporation technique, yielded a primary crystallization age of 741 ± 6 Ma. Both the stratigraphic position and the geochemistry of the volcanic rocks indicate an early continental rift environ- ment. The new data not only provide an age for the massive Zn-Pb-Cu sulfide mineralization associated with these volcanic rocks, but they also set a maximum age limit for Neoproterozoic continental break-up in southern Namibia. This age is statistically indistinguishable from a recently reported age of 748 + 3 Ma for stratigraphically equivalent volcanic rocks in the northern rift of the Damara Belt, suggesting that the onset of the formation of the N-S-trending Adamastor ocean and of the NE-trending Khomas ocean in central and northern Namibia occurred at the same time. The volcanic unit directly overlies, in both rift grabens, a diamictite horizon with glaciogenic features. Our new results further constrain the age of this glacial epoch, which may be correlated with the Sturtian glaciation, to around 750 Ma | en_ZA |
| dc.identifier | http://dx.doi.org/10.2307/30067385 | |
| dc.identifier.apacitation | Frimmel, H., Klötzli, U., & Siegfried, P. (1996). New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia. <i>Journal of Geology</i>, http://hdl.handle.net/11427/21027 | en_ZA |
| dc.identifier.chicagocitation | Frimmel, H, U Klötzli, and P Siegfried "New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia." <i>Journal of Geology</i> (1996) http://hdl.handle.net/11427/21027 | en_ZA |
| dc.identifier.citation | Frimmel, H. E., Klötzli, U. S., & Siegfried, P. R. (1996). New Pb-Pb single zircon age constraints on the timing of Neoproterozoic glaciation and continental break-up in Namibia. The Journal of Geology, 459-469. | en_ZA |
| dc.identifier.issn | 0022-1376 | en_ZA |
| dc.identifier.ris | TY - Journal Article AU - Frimmel, H AU - Klötzli, U AU - Siegfried, P AB - Dating of single zircons from low-grade metamorphosed rhyolites in the Rosh Pinah Formation of the Gariep Belt in southwestern Namibia, using the Pb evaporation technique, yielded a primary crystallization age of 741 ± 6 Ma. Both the stratigraphic position and the geochemistry of the volcanic rocks indicate an early continental rift environ- ment. The new data not only provide an age for the massive Zn-Pb-Cu sulfide mineralization associated with these volcanic rocks, but they also set a maximum age limit for Neoproterozoic continental break-up in southern Namibia. This age is statistically indistinguishable from a recently reported age of 748 + 3 Ma for stratigraphically equivalent volcanic rocks in the northern rift of the Damara Belt, suggesting that the onset of the formation of the N-S-trending Adamastor ocean and of the NE-trending Khomas ocean in central and northern Namibia occurred at the same time. The volcanic unit directly overlies, in both rift grabens, a diamictite horizon with glaciogenic features. Our new results further constrain the age of this glacial epoch, which may be correlated with the Sturtian glaciation, to around 750 Ma DA - 1996 DB - OpenUCT DP - University of Cape Town J1 - Journal of Geology LK - https://open.uct.ac.za PB - University of Cape Town PY - 1996 SM - 0022-1376 T1 - New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia TI - New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia UR - http://hdl.handle.net/11427/21027 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/21027 | |
| dc.identifier.vancouvercitation | Frimmel H, Klötzli U, Siegfried P. New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia. Journal of Geology. 1996; http://hdl.handle.net/11427/21027. | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher | University of Chicago Press | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.rights | Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ | en_ZA |
| dc.source | Journal of Geology | en_ZA |
| dc.source.uri | http://www.journals.uchicago.edu/toc/jg/current | |
| dc.title | New Pb-Pb single zircon age constraints on the timing of neoproterozoic glaciation and continental break-up in Namibia. | en_ZA |
| 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 |