Bassis, Alexander ; Hinderer, Matthias ; Meinhold, G. (2015)
Provenance of Saudi Arabian Palaeozoic sandstones using whole rock and single grain geochemistry.
Geo Berlin 2015. Berlin (04.10.2015-07.10.2015)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
Despite having been intensely studied, the Saudi Arabian Palaeozoic clastic succession still proves to be difficult to correlate in both outcrop and subsurface, due to the high maturity of sandstones and scarcity of fossils. To better understand stratigraphic relationships and sedimentary provenance on a passive margin, Palaeozoic sandstones from two study areas in southern (Wajid area) and northern (Tabuk area) Saudi Arabia have been analysed for whole rock and single grain geochemical data of detrital rutile and garnet and internal zircon morphology. Most common geochemical discrimination diagrams suggest a craton interior dominated provenance in a passive margin tectonic setting for both study areas, which is in accordance with the tectonic framework of the Arabian Plate during the Palaeozoic. Trace element ratios of Th/Sc and Zr/Sc suggest sediment recycling in some units. The data also tentatively suggest a change in provenance during the Devonian in the Wajid area, which was not observed in the Tabuk area. Internal zircon morphology obtained from cathodoluminescence images suggest a dominant magmatic source, with a minor contribution of metamorphic zircons in Wajid area sediments. Here, the distribution of morphotypes is remarkably similar throughout the succession. Data from the Tabuk area will be available at the time of the conference. Rutile geochemistry from the Tabuk area suggest a mainly felsic source (e.g., micaschists, paragneisses, felsic granulites, granites), while southern rutiles are of mixed mafic and felsic origin. Zr-in-rutile thermometry reveals a high-T population in northern samples, that is absent in the Wajid area. Garnets were only found in Late Palaeozoic (Devonian and Carboniferous-Permian) sandstones. Their composition is mostly similar in both study areas. Most garnets are derived from metasedimentary or granitic rock. A minor population of high-grade metabasic garnets has been observed in the Tabuk area only.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Bassis, Alexander ; Hinderer, Matthias ; Meinhold, G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Provenance of Saudi Arabian Palaeozoic sandstones using whole rock and single grain geochemistry. |
| Sprache: | Englisch |
| Publikationsjahr: | 4 Oktober 2015 |
| Ort: | Berlin |
| Buchtitel: | DYNAMIC EARTH · from Alfred Wegener to today and beyond |
| Veranstaltungstitel: | Geo Berlin 2015 |
| Veranstaltungsort: | Berlin |
| Veranstaltungsdatum: | 04.10.2015-07.10.2015 |
| URL / URN: | http://www.geoberlin2015.de/assets/book_of_abstracts_geoberl... |
| Kurzbeschreibung (Abstract): | Despite having been intensely studied, the Saudi Arabian Palaeozoic clastic succession still proves to be difficult to correlate in both outcrop and subsurface, due to the high maturity of sandstones and scarcity of fossils. To better understand stratigraphic relationships and sedimentary provenance on a passive margin, Palaeozoic sandstones from two study areas in southern (Wajid area) and northern (Tabuk area) Saudi Arabia have been analysed for whole rock and single grain geochemical data of detrital rutile and garnet and internal zircon morphology. Most common geochemical discrimination diagrams suggest a craton interior dominated provenance in a passive margin tectonic setting for both study areas, which is in accordance with the tectonic framework of the Arabian Plate during the Palaeozoic. Trace element ratios of Th/Sc and Zr/Sc suggest sediment recycling in some units. The data also tentatively suggest a change in provenance during the Devonian in the Wajid area, which was not observed in the Tabuk area. Internal zircon morphology obtained from cathodoluminescence images suggest a dominant magmatic source, with a minor contribution of metamorphic zircons in Wajid area sediments. Here, the distribution of morphotypes is remarkably similar throughout the succession. Data from the Tabuk area will be available at the time of the conference. Rutile geochemistry from the Tabuk area suggest a mainly felsic source (e.g., micaschists, paragneisses, felsic granulites, granites), while southern rutiles are of mixed mafic and felsic origin. Zr-in-rutile thermometry reveals a high-T population in northern samples, that is absent in the Wajid area. Garnets were only found in Late Palaeozoic (Devonian and Carboniferous-Permian) sandstones. Their composition is mostly similar in both study areas. Most garnets are derived from metasedimentary or granitic rock. A minor population of high-grade metabasic garnets has been observed in the Tabuk area only. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Angewandte Sedimentgeologie |
| Hinterlegungsdatum: | 26 Jan 2016 18:35 |
| Letzte Änderung: | 13 Jul 2018 08:54 |
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