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Title: Direct dating of stomatolitic carbonates from the Schmidtsdrif Formation (Transvaal Dolomite), South Africa, with implications on the age of the Ventersdorp Supergroup

Abstract

Pb isotopic analyses of stromatolitic limestones from the Schmidtsdrif Formation (Transvaal Dolomite) of South Africa give a late Archean isochron age of 2,557 {plus minus}49 (2 sigma) Ma. The new date significantly changes the position of the Archean-Proterozoic boundary in the Kaapvaal province and suggests that a possible division of the Transvaal Supergroup is necessary. It also resolves the long-standing controversy about the age of the Ventersdorp Supergroup, whose zircon U-Pb data of ca. 2.7 Ga must be more acceptable than the Rb-Sr dates of about 2.3 Ga. The study provides a new example that demonstrates the great potential of employing the U-Pb systems of carbonate rocks for direct dating of sedimentary sequences.

Authors:
; ;  [1];  [2]
  1. (Universite de Rennes (France))
  2. (Universite des Sciences at Techniques du Languedoc, Montpellier (France))
Publication Date:
OSTI Identifier:
5572807
Resource Type:
Journal Article
Journal Name:
Geology; (USA)
Additional Journal Information:
Journal Volume: 18:12; Journal ID: ISSN 0091-7613
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; GEOLOGIC FORMATIONS; AGE ESTIMATION; SOUTH AFRICA; BOUNDARY CONDITIONS; CARBONATE ROCKS; DOLOMITE; GEOLOGY; ISOTOPE DATING; ISOTOPE RATIO; LEAD ISOTOPES; LIMESTONE; PRECAMBRIAN ERA; RUBIDIUM ISOTOPES; SEDIMENTARY ROCKS; STRONTIUM ISOTOPES; URANIUM ISOTOPES; ZIRCON; ACTINIDE ISOTOPES; AFRICA; ALKALI METAL ISOTOPES; ALKALINE EARTH ISOTOPES; ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; GEOLOGIC AGES; ISOTOPES; MAGNESIUM CARBONATES; MAGNESIUM COMPOUNDS; MINERALS; OXYGEN COMPOUNDS; ROCKS; SILICATE MINERALS; SILICATES; SILICON COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; ZIRCONIUM SILICATES; 580000* - Geosciences

Citation Formats

Jahn, Bor-ming, Morin, N., Mace, J., and Bertrand-Sarfati, J. Direct dating of stomatolitic carbonates from the Schmidtsdrif Formation (Transvaal Dolomite), South Africa, with implications on the age of the Ventersdorp Supergroup. United States: N. p., 1990. Web. doi:10.1130/0091-7613(1990)018<1211:DDOSCF>2.3.CO;2.
Jahn, Bor-ming, Morin, N., Mace, J., & Bertrand-Sarfati, J. Direct dating of stomatolitic carbonates from the Schmidtsdrif Formation (Transvaal Dolomite), South Africa, with implications on the age of the Ventersdorp Supergroup. United States. doi:10.1130/0091-7613(1990)018<1211:DDOSCF>2.3.CO;2.
Jahn, Bor-ming, Morin, N., Mace, J., and Bertrand-Sarfati, J. Sat . "Direct dating of stomatolitic carbonates from the Schmidtsdrif Formation (Transvaal Dolomite), South Africa, with implications on the age of the Ventersdorp Supergroup". United States. doi:10.1130/0091-7613(1990)018<1211:DDOSCF>2.3.CO;2.
@article{osti_5572807,
title = {Direct dating of stomatolitic carbonates from the Schmidtsdrif Formation (Transvaal Dolomite), South Africa, with implications on the age of the Ventersdorp Supergroup},
author = {Jahn, Bor-ming and Morin, N. and Mace, J. and Bertrand-Sarfati, J.},
abstractNote = {Pb isotopic analyses of stromatolitic limestones from the Schmidtsdrif Formation (Transvaal Dolomite) of South Africa give a late Archean isochron age of 2,557 {plus minus}49 (2 sigma) Ma. The new date significantly changes the position of the Archean-Proterozoic boundary in the Kaapvaal province and suggests that a possible division of the Transvaal Supergroup is necessary. It also resolves the long-standing controversy about the age of the Ventersdorp Supergroup, whose zircon U-Pb data of ca. 2.7 Ga must be more acceptable than the Rb-Sr dates of about 2.3 Ga. The study provides a new example that demonstrates the great potential of employing the U-Pb systems of carbonate rocks for direct dating of sedimentary sequences.},
doi = {10.1130/0091-7613(1990)018<1211:DDOSCF>2.3.CO;2},
journal = {Geology; (USA)},
issn = {0091-7613},
number = ,
volume = 18:12,
place = {United States},
year = {1990},
month = {12}
}