Contribution
Postpaleozoic Stratigraphy, Structure and Orogenetic Evolution of the Southern Sabzewar Zone and the Taknar Block (Khorassan, NE Iran)
Lindenberg, H. G.; Görler, K.; Jacobshagen, V.; Ibbeken, H.
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 168 Heft 2-3 (1984), p. 287 - 326
31 références bibliographiques
publié: Jun 28, 1984
publication en ligne: Jul 27, 2018
DOI: 10.1127/njgpa/168/1984/287
ArtNo. ESP155016802012, Prix: 29.00 €
Abstract
The Oryan Basin, S of Sabzewar, as part of the Sabzewar zone and a wedgelike scale, the Taknar block which separates the Sabzewar zone from the Lut block in the south, are described in their post-Paleozoic geological evolution. The Taknar block is separated by major fault systems from the adjacent tectonical units. It shows a sedimentary and structural development which cannot be linked directly to either the Lut block or the Sabzewar zone. This may be related to pre-Paleogene rotations postulated by Davoudzadeh & Schmidt (1981) for the Central Iranian Microcontinent. Facial and structural considerations in the Oryan Basin (Sabzewar zone) lead to the postulation of North-South directed gravitational nappes which formed in the time span between Upper Cretaceous and Upper Paleogene. Nappe formation is seen in connection with the closure of an oceanic belt north of the Central Iranian microplate in the Upper Cretaceous. Ophiolitic melanges in the southern Sabzewar zone are interpreted as tectonical breccias at the base of the oldest nappes. A hypothetical model is constructed which is in agreement with the field observations.
Mots-clefs
Regional geology • Cretaceous • Paleogene • biostratigraphy • foraminiferal fauna • gravity sliding • nappe • ophiolite • melange • microplate • plate rotation • theoretical model • Iran • Khorassan