Radiolarian Cretaceous age of Soulabest radiolarites in ophiolite suite of eastern Iran
| Autor: | Patrick De Wever, Seyed Ahmad Babazadeh |
|---|---|
| Přispěvatelé: | Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Paléobiodiversité : histoire et dynamique, Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2004 |
| Předmět: |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics
Lut and Afghan blocks 010506 paleontology Accretionary wedge Aptian biology Terrigenous sediment Sistan suture zone Eastern Iran Geology Soulabest Radiolarites Pelagic sediment 010502 geochemistry & geophysics biology.organism_classification Ophiolite 01 natural sciences Cretaceous Paleontology Cretaceous Radiolaria Ophiolite Suite Gazik Province Radiolaria 0105 earth and related environmental sciences Faunal assemblage |
| Zdroj: | Bulletin de la Société Géologique de France Bulletin de la Société Géologique de France, Société géologique de France, 2004, 175, pp.2 121-129. ⟨10.2113/175.2.121⟩ |
| ISSN: | 1777-5817 0037-9409 |
| Popis: | The ophiolite-flysch range (accretionary prism) of the Sistan suture zone from eastern Iran includes several intensely deformed tectonic units, some of which consist of volcaniclastic rocks, volcanic rocks, siliceous pelagic sediments (cherts and radiolarites) and calcareous rocks (deep marine, platform), whereas others are represented by terrigenous turbidites. The Soulabest radiolarites are located in the Ratuk complex of the Tirrul’s subdivision [Tirrul et al. , 1983], or in the ophiolite suite of the Gazik province. The local biostratigraphy of this region is based on two faunal assemblages. Faunal assemblage I is dated early Aptian, faunal assemblage II is attributed to middle-late Albian. The most abundant fauna is found in the middle-late Albian. The timing of the oceanic opening in eastern Iran remained questionable until now. The study of the radiolarites of the Soulabest area provides new data for dating the primary opening between two microcontinents : the Lut and Afghan blocks. It is proposed that the oceanic opening of the two blocks occurred prior to the early Aptian. In previous reports, the age of opening was attributed to Upper Cretaceous. All reported Radiolaria are found in red radiolarites and green-red argillaceous cherts. This formation is unconformably overlain by Maastrichtian conglomerates. It indicates that the closure of the basin occurred in Maastrichtian age. |
| Databáze: | OpenAIRE |
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