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Layered ultramafic complexes of the Barberton Greenstone Belt - age constraints and tectonic implications.
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- Author(s): Hofmann, A.1 ; Anhaeusser, C. R.2 ; Li, X-H.3
- Source:
South African Journal of Geology. Mar2021, Vol. 124 Issue 1, p7-16. 10p.- Subject Terms:
- Source:
- Additional Information
- Abstract: Layered ultramafic-mafic complexes are a common component of the stratigraphically uppermost part of the Onverwacht Group of the Barberton Greenstone Belt. Associated with the Mendon Formation in the south and the Weltevreden Formation in the north, they represent an assemblage of thick differentiated flows and shallow synvolcanic intrusions ranging in composition from dunite to gabbro. U-Pb zircon dating of gabbro from the Sawmill and the Mundt's Concession ultramafic complexes from the northern part of the Barberton Greenstone Belt yielded ages of 3 258 ± 8 Ma and 3 244 ± 11 Ma, respectively. The ultramafic complexes are thus regarded to have been emplaced during a magmatic flare-up in the final stage of Weltevreden Formation volcanism, post-dating ultramafic magmatism in the southern part of the belt by several millions of years and thus suggesting diachronous evolution of the Onverwacht Group in the Barberton Greenstone Belt. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of South African Journal of Geology is the property of Geological Society of South Africa and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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