DBPapers
DOI: 10.5593/SGEM2016/B11/S01.002

A NEW APPROACH TO STRATIGRAPHIC INTERPRETATION - RAHOVECI REGION

S. Quamil
Monday 5 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-55-1 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 1, 11-18pp

ABSTRACT
The Mesozoic deposits are widespread in the Rahoveci region and cover an area of approximately 35-40% of the 1600 km2 total surface area. The Triassic deposits crop out in southeast and central part of the region. They are represented by metamorphosed limestones, schists, intracontinental basalts etc. Their relationship with the underlying Paleozoic formations is tectonic. Middle Triassic limestones are dated based on the following conodont fauna: Enantignatus ziegleri, Prioniodina latidentata, Spathognathodus kockeli, Gondolella sp. cf. G. navicula.
The Jurassic deposits crop out in westerns part of the Rahoveci region, along the River “Drini i Bardhe”. The oldest Jurassic formation is the “blocks in matrix” – type mélange. It consists of blocks of different lithology in a shaly matrix. The predominant lithology of the mélange-blocks is sandstone. The sandstone blocks consist of fine to very coarse-grained, dark gray to yellow arenites. The age of the mélange, according to the stratigraphic position, is related to middle – late Jurassic. Limestones include abundant charophyta, lying above the ultrabasic rocks, crop out in a limited area of this region. Their presence indicates a rapid shallowing of the basin. The age of the limestones with charophyta can be related to Late Jurassic. Both the ultrabasic rocks and the mélange “blocks in matrix” are unconformably overlain by ophiolitic breccias. The presence of ophiolitic breccias marks disruption of the underlying oceanic crust. The radiolarian cherts, found at the top of the ophiolitic breccias, are being referred to here as Çupeva cherts. They show a thickness of about 40 m and crop out on the right bank of the River Drini i Bardhe. The presence of radiolarian cherts indicates the homogenization of the deep water. The Çupeva cherts consist of beds of radiolarites 5-30cm thick alternating with few mm of siliceous shales; thick levels of tuffs and, rarely tuffitic sands, are also present. The samples from the Guri i Zi section and the Çupeva e Nalte section contain radiolarian assemblages which indicate middle-late Oxfordian to Kimmeridgian-early Tithonian. The Çupeva cherts are subsequently covered by the Volljaku Flysch, which represents a siliceous-clastic turbiditic deposit, dated as late Kimmeridgian-early Tithonian by foraminifera and calcareous algae. The following microfossils are recognized: Clypeina jurassica Favre, Parurgonina caelinensis Cuvillier, Codiacean algae, Tubiphytes sp., Textularida sp., Ostracods, Sacoccoma-type fragment etc. The flysch shows a 450m thick sequence and can be subdivided in two members: the lower member is mainly composed of clast and matrix supported pebbly sandstones and mudstones; the upper member is mainly composed of arenites with minor siltstone beds. The ophiolitic breccias, the Çupeva cherts and the Volljaku Flysch represent the oldest depositions lying above the ophiolite; they marked the ocean-basin closure.
The Cretaceous deposits are widespread in this region. They crop out in east of the ophiolitic unit of Rahoveci. The Cretaceous deposits are mainly made up by basal conglomerates, platform and pelagic limestones and flyschoidal deposits. In previous studies, two lithostratigraphic units were individuated. For the first time, in this paper, the following three lithostratigraphic units have been individuated: Grebniku Unit, Ponorci Unit and Dresniku Unit.

Keywords: Stratigraphy, deposits, cross section, belts and fossil

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