Post-orogenic shoshonitic magmas of the Yzerfontein pluton, South Africa: the 'smoking gun' of mantle melting and crustal growth during Cape granite genesis?

Simple item page
dc.contributor.authorClemens, J.D.
dc.contributor.authorBuick, I.S.
dc.contributor.authorFrei, D.
dc.contributor.authorLana, C.
dc.contributor.authorVillaros, A.
dc.date.accessioned2017-08-15T13:36:34Z
dc.date.available2017-08-15T13:36:34Z
dc.date.issued2017
dc.description.abstractThe post-orogenic Yzerfontein pluton, in the Saldania Belt of South Africa was constructed through numerous injections of shoshonitic magmas. Most magma compositions are adequately modelled as products of fractionation, but the monzogranites and syenogranites may have a separate origin. A separate high-Mg mafic series has a less radiogenic mantle source. Fine-grained magmatic enclaves in the intermediate shoshonitic rocks are autoliths. The pluton was emplaced between 533 ± 3 and 537 ± 3 Ma (LASF-ICP-MS U–Pb zircon), essentially synchronously with many granitic magmas of the Cape Granite Suite (CGS). Yzerfontein may represent a high-level expression of the mantle heat source that initiated partial melting of the local crust and produced the CGS granitic magmas, late in the Saldanian Orogeny. However, magma mixing is not evident at emplacement level and there are no magmatic kinships with the I-type granitic rocks of the CGS. The mantle wedge is inferred to have been enriched during subduction along the active continental margin. In the late- to post-orogenic phase, the enriched mantle partially melted to produce heterogeneous magma batches, exemplified by those that formed the Yzerfontein pluton, which was further hybridized through minor assimilation of crustal materials. Like Yzerfontein, the small volumes of mafic rocks associated with many batholiths, worldwide, are probably also lowvolume, high-level expressions of crustal growth through the emplacement of major amounts of mafic magma into the deep crust.
dc.description.accreditationISI
dc.identifier.citationClemens, J. D. et al. (2017). Post-orogenic shoshonitic magmas of the Yzerfontein pluton, South Africa: the 'smoking gun' of mantle melting and crustal growth during Cape granite genesis? Contributions to Mineralogy and Petrology, 172: 72en_US
dc.identifier.issn0010-7999
dc.identifier.urihttp://hdl.handle.net/10566/3123
dc.identifier.urihttp://dx.doi.org/10.1007/s00410-017-1390-9
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherSpringer Verlagen_US
dc.rightsThis is the author-version of the article published online at: http://dx.doi.org/10.1007/s00410-017-1390-9
dc.status.ispeerreviewedTRUE
dc.subjectYzerfontein plutonen_US
dc.subjectPotassic magmasen_US
dc.subjectCape granite suiteen_US
dc.subjectMonzoniticen_US
dc.subjectShoshoniticen_US
dc.subjectMafic magmasen_US
dc.subjectU-Pben_US
dc.subjectHf isotopesen_US
dc.subjectIsotope tracingen_US
dc.subjectMantle heaten_US
dc.titlePost-orogenic shoshonitic magmas of the Yzerfontein pluton, South Africa: the 'smoking gun' of mantle melting and crustal growth during Cape granite genesis?en_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Clemens_Post-orogenic-shoshonitic_2017_.pdf
Size:
2.85 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Research Articles (Earth Sciences)