Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
 
<< vorige    volgende >>
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 4 van 9 gevonden artikelen
 
 
  Late Miocene (U+Th)-4He ages of ferruginous nodules from lateritic duricrust, Darling Range, Western Australia
 
 
Titel: Late Miocene (U+Th)-4He ages of ferruginous nodules from lateritic duricrust, Darling Range, Western Australia
Auteur: Pidgeon, R. T.
Brander, T.
Lippolt, H. J.
Verschenen in: Australian journal of earth sciences
Paginering: Jaargang 51 (2004) nr. 6 pagina's 901-909
Jaar: 2004-12
Inhoud: (U+Th)-4He dates are presented for hematite/maghemite and hematite separates from pisolitic nodules from four rock specimens of lateritic duricrust sampled in an area of about 1 km2 in the Darling Range about 50 km northeast of Perth, where the duricrust forms a continuous cover over rocks of the Archaean Yilgarn Craton. Textures and compositions of the separates were checked by X-ray diffraction and scanning electron microscopy. Hematite/maghemite separates from three of the specimens yielded ages of about 10 Ma, identical within error (weighted mean, 9.9 ± 0.9 Ma, 2s), whereas the hematite separate from the fourth specimen gave a U-He date of 7.5 Ma, all within the Late Miocene. While questions remain as to whether initial and boundary conditions of dating are adequately fulfilled, the iron oxide 4He dates are in good agreement with estimates by palaeomagnetic dating and other methods for the age of laterite formation in the Darling Range and other parts of south Western Australia. This study demonstrates the potential of (U+Th)-4He dating as a serviceable, directly applicable tool for dating lateritic duricrust.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details van artikel 4 van 9 gevonden artikelen
 
<< vorige    volgende >>
 
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland