Early Silurian (Llandovery) graptolite assemblages of Saudi Arabia: biozonation, palaeoenvironmental significance and biogeography

Williams, M.; Zalasiewicz, J.; Boukhamsin, H.; Cesari, C.

doi:10.7306/gq.1270

Artykuł - szczegóły

Tytuł artykułu

Early Silurian (Llandovery) graptolite assemblages of Saudi Arabia: biozonation, palaeoenvironmental significance and biogeography

Autorzy

Williams M. , Zalasiewicz J. , Boukhamsin H. , Cesari C.

Treść / Zawartość

Pełne teksty:

Williams_M_Early_Geol. Quarterly_Vol. 60_No 1_2016.pdf

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Identyfikatory

DOI

10.7306/gq.1270

Warianty tytułu

Języki publikacji

Abstrakty

Analysis of Silurian graptolite assemblages from 1017 sample horizons in 132 cores (from 65 boreholes) through the Qusaiba Member, Qalibah Formation of Saudi Arabia, provides a refined graptolite biostratigraphy for the Arabian Peninsula comparable in its resolution to that from the British Isles and the Czech Republic. Over 150 graptolite species characterize 11 biozones from the lowermost Rhuddanian lubricus Biozone to the lower Telychian guerichi Biozone, with sub-zonal resolution for several intervals. Graptolite biozonal boundaries and the Rhuddanian-Aeronian and Aeronian-Telychian stage boundaries can be placed with high precision. Detailed analysis of graptolite spatial distribution suggests persistent depth-stratified marine assemblages across the Silurian palaeo-Arabian Plate. Near-surface-dwelling assemblages probably occupied the mixed-layer of Silurian oceans, enabling colonization of shallow shelf environments. They are low-diversity (1-2 species) assemblages characterized by Neodiplograptus, Coronograptus, Neolagarograptus and Stimulograptus species and often are preserved in strata with extensive shelly faunas. Deeper marine assemblages are of higher diversity (up to 15 species per horizon), and are characterized by dorsally curved or helically coiled species of Spirograptus, Demirastrites, Lituigraptus, Rastrites and Torquigraptus. Recognition of depth-stratified graptolite assemblages provides an important tool for establishing palaeo-basin topography and water depth at the time of sedimentary deposition. At the species level, the graptolite assemblages of Saudi Arabia are remarkably similar to contemporaneous faunas from peri-Gondwanan Europe and, from the middle Rhuddanian onwards, also to the Avalonian and Laurentian Llandovery graptolites of the UK.

Słowa kluczowe

Saudi Arabia Silurian graptolites biozonation

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Geological Quarterly

Rocznik

2016

Tom

Vol. 60, No. 1

Strony

3--25

Opis fizyczny

Bibliogr. 65 poz., fot., mapy, rys., tab.

Twórcy

autor

Williams M.

University of Leicester, Department of Geology, Leicester LE1 7RH, UK

autor

Zalasiewicz J.

mri@leicester.ac.uk

University of Leicester, Department of Geology, Leicester LE1 7RH, UK

autor

Boukhamsin H.

Saudi Aramco, Geological Technical Services Division, Dhahran, Saudi Arabia

autor

Cesari C.

Saudi Aramco, Geological Technical Services Division, Dhahran, Saudi Arabia

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.

Typ dokumentu

Bibliografia

Identyfikator YADDA

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