|
| << 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 15 van 16 gevonden artikelen
| Titel: |
Tibooburra Granodiorite, western New South Wales: Emplacement history and geochemistry |
| Auteur: |
Thalhammer, O. A. R. Stevens, B. P. J. Gibson, J. H. Grum, W. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 45 (1998) nr. 5 pagina's 775-787 |
| Jaar: |
1998-10 |
| Inhoud: |
The Tibooburra Inlier, in the Thomson Fold Belt in northwestern New South Wales, forms a morphological dome-like structure, comprising a pluton, the Tibooburra Granodiorite, enclosed by greenschist grade and locally hornfelsed metasediments, the Easter Monday beds. The inlier is surrounded by Mesozoic, Tertiary and Quaternary sedimentary rocks that unconformably overlie the Easter Monday beds.The inlier is part of the Tibooburra Block, which is separated from the Milparinka Block by the north-northwest-trending Warratta Fault. Structural investigation of the Easter Monday beds revealed two deformational events. The principal deformation (D1), represented by a northwest-trending S1 fabric with horizontally plunging, upright to inclined, tight F1 folds, was followed by a second event (D2), characterised by F2 folds, west-southwest-trending F2 kink bands and brittle deformation. The Tibooburra Granodiorite comprises a main granodiorite pluton, dacite, aplite and pegmatite dykes, and shows brittle deformation of the same style as that in the Easter Monday beds. Structural relationships show that the granodiorite intruded the Easter Monday beds syntectonically late in D1. The age of the granodiorite is around 410 Ma based on mineral Sr data. Geochemical and whole-rock Sr-isotopic investigations of the Tibooburra Granodiorite revealed an l-type character for the parent magma. The initial 87Sr/86Sr ratios lie in the range 0.7050-0.7053 and are thus in good agreement with the geochemistry. It is suggested that the Tibooburra Granodiorite was derived from a deep crustal, igneous source, and has been emplaced in an intracontinental setting. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 15 van 16 gevonden artikelen
| << vorige | volgende >> |