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Geochronological and isotopic constraints on the Mesoproterozoic Namaqua-Natal Belt: evidence from deep borehole intersections in South Africa

Eglington, B.M.; Armstrong, Richard

Description

Mesoproterozoic lithologies of the Namaqua-Natal Belt are exposed in the west and east of South Africa but the central section of the belt is obscured by younger sedimentary cover. This belt is one of several Grenvillian-aged belts world-wide and is of importance in reconstructions of the Meso- to Neo-Proterozoic supercontinent of Rodinia. Zircons from granite and biotite gneiss in two deep boreholes which penetrated the Phanerozoic cover provide SHRIMP U-Pb dates of 1053+29/-25 Ma and...[Show more]

dc.contributor.authorEglington, B.M.
dc.contributor.authorArmstrong, Richard
dc.date.accessioned2015-12-13T22:37:24Z
dc.date.available2015-12-13T22:37:24Z
dc.identifier.issn0301-9268
dc.identifier.urihttp://hdl.handle.net/1885/77079
dc.description.abstractMesoproterozoic lithologies of the Namaqua-Natal Belt are exposed in the west and east of South Africa but the central section of the belt is obscured by younger sedimentary cover. This belt is one of several Grenvillian-aged belts world-wide and is of importance in reconstructions of the Meso- to Neo-Proterozoic supercontinent of Rodinia. Zircons from granite and biotite gneiss in two deep boreholes which penetrated the Phanerozoic cover provide SHRIMP U-Pb dates of 1053+29/-25 Ma and 1134+15/-15 Ma. Sm-Nd model dates for whole-rock samples from these and two other boreholes range from ∼2400 to 1200 Ma, unlike model dates from the eastern (Natal) sector of the Namaqua-Natal Belt which are all younger than ∼1400 Ma. Model dates are similar to those noted in the Bushmanland and Richtersveld Sub-provinces of the western (Namaqua) sector of the Belt. The results are interpreted to indicate that this Proterozoic crust may be an easterly extension of the Bushmanland Sub-province or some equivalent terrane and that there must be a terrane boundary between the eastern-most borehole studied and the surface outcrops further east.
dc.publisherElsevier
dc.sourcePrecambrian Research
dc.subjectKeywords: neodymium; samarium; zirconium; borehole; geochronology; Grenvillian orogeny; isotopic analysis; lithology; Proterozoic; SHRIMP dating; article; chronology; geochemical analysis; geology; granite; proterozoic; South Africa; Africa; Namaqua-Natal Belt; Nam Geochronology; Isotope; Mesoproterozoic; Namaqua-Natal; South Africa
dc.titleGeochronological and isotopic constraints on the Mesoproterozoic Namaqua-Natal Belt: evidence from deep borehole intersections in South Africa
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume125
dc.date.issued2003
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationMigratedxPub5943
local.type.statusPublished Version
local.contributor.affiliationEglington, B.M., University of Saskatchewan
local.contributor.affiliationArmstrong, Richard, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.startpage179
local.bibliographicCitation.lastpage189
local.identifier.doi10.1016/S0301-9268(02)00199-7
dc.date.updated2015-12-11T09:36:31Z
local.identifier.scopusID2-s2.0-0037820794
CollectionsANU Research Publications

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