Abstract Cherty limestones, marls and radiolarites are widespread in the Hallstatt Mélange of Northern Calcareous Alps. The mélange was formed during Neotethyan orogeny a series deep-water basins that progressively developed front advancing nappe front. low thermal overprint these rocks favors good preservation radiolarians (polycystines) have been used for dating reconstructing Jurassic tectonostratigraphy area. This paper describes rich Middle–Late radiolarian faunas from four localities...

Abstract This paper summarizes 30 years of research on the biostratigraphy Triassic radiolarians and presents a correlation currently-used radiolarian zonations established in North America, Europe, Japan Far East Russia. An up-to-date stratigraphic distribution all hitherto described still valid genera is provided. new range chart consists 282 allows an accurate dating to substage level. It also clearly manifests general trends evolution through Triassic. The end-Permian extinction, most...

Research Article| January 01, 2011 A biocalcification crisis at the Triassic-Jurassic boundary recorded in Budva Basin (Dinarides, Montenegro) Alenka E. Črne; Črne † 1Ivan Rakovec Institute of Palaeontology, ZRC SAZU, Novi trg 2, SI-1000 Ljubljana, Slovenia †E-mail: acrne@zrc-sazu.si Search for other works by this author on: GSW Google Scholar Helmut Weissert; Weissert 2Geological Institute, Universitätstrasse 16, ETH-Zürich, CH-8092 Zürich, Switzerland Špela Goričan; Goričan Stefano M....

The Nain and Ashin ophiolites consist of Mesozoic mélange units that were emplaced in the Late Cretaceous onto continental basement Central-East Iran microcontinent (CEIM). They largely serpentinized peridotites slices; nonetheless, minor tectonic slices sheeted dykes pillow lavas - locally stratigraphically associated with radiolarian cherts can be found these ophiolitic mélanges. Based on their whole rock geochemistry mineral chemistry, rocks divided into two geochemical groups. most show...

This volume comprises a catalogue of 90 genera, 274 species and 13 subspecies Pliensbachian, Toarcian Aalenian Radiolaria. Two 37 3 are new formal descriptions, 24 described in open nomenclature. Each taxon is presented with complete up-to-date synonymy, original description remarks (translated into English where necessary), subsequent emendations, by the authors this catalogue, etymology. Descriptions species/subspecies further contain measurements, type locality, data on geographic...

Bedded radiolarites of Mt. Kalnik are Carnian-Norian age, while similar rocks Medvednica Late Ladinian - Carnian as determined on the basis radiolarian assemblages. Radiolarites from concordantly rest upon pillow-lavas, or interbedded with them. Their footwall at is not known, due to tectonic reduction. The sedimentary described were deposited low-density turbidity currents, therefore representing fine-grained turbidites. They closely below, and partially above CCD. Results petrological,...

On the NW part of Medvednica Mt. radiolarites with carbonate olistoliths, shales and siltites, matrix-supported conglomerates basic volcanic rocks were investigated. This facies association is informally named Poljanica unit. Major element geochemical data indicate deposition in vicinity middle oceanic ridge, while sedimentological an area closer to continent. Shales as well conglomerates, deposited short periods characterised by increased input terrigenous material. Matrix-supported...

Research Article| December 01, 2005 Bathonian radiolarians from an ophiolitic mélange of the Alpine Tethys (Gets Nappe, Swiss-French Alps) Luis O'Dogherty; O'Dogherty 1Facultad de Ciencias del Mar, Universidad Cádiz, 11510 Puerto Real, Spain, e-mail: lodogher@uca.es Search for other works by this author on: GSW Google Scholar Markus Bill; Bill 2Division Biology, 132 Ackert Hall, Kansas State University, Manhattan, KS 66506, mbill@ksu.edu Špela Gorican; Gorican 3Paleontoloski Institut Ivana...

Abstract Middle Triassic arc-related extensional tectonics in the western Tethys generated a complex pattern of intra-and backarc basins. We studied volcano-sedimentary successions subsided continental-margin blocks (Mts. Žumberak and Ivanščica) dismembered incomplete ophiolite sequences interpreted as remnants basin Medvednica Kalnik) northwestern Croatia. dated with radiolarians, conodonts, foraminifers, algae, sponges. The continental margin experienced phase accelerated subsidence...

Abstract A short-term radiolarite interval of Late Anisian (Late Illyrian) age was dated by means radiolarians and conodonts in the Dinarides, Montenegro. The radiolarites, with intercalations filament-rich limestone layers higher part, were deposited deeper-water shelf areas, as documented underlying overlying shallow-water carbonate succession. This Illyrian is widespread northwestern Tethyan realm, especially a phase when production decreased. event occurred shortly after main subsidence...

Abstract The Tolmin basin is a typical example of deep-water Mesozoic that developed on the rifted south Tethyan continental margin. Remnants this are preserved at intersection Dinarides and southern Alps in northwestern Slovenia. Jurassic successions consist carbonate gravity-flow deposits, radiolarian cherts shales, overlain by pelagic Biancone limestone. A distinctive chert-dominated interval (the upper member Formation) was dated with radiolarians. base assigned to late Bajocian distal...

The Dinarides, together with the Albanides and Hellenides, preserve stratigraphic successions derived from eastern margin of Adriatic microplate remnants ophiolites obducted Maliac-Vardar branch Neotethys Ocean. main stages in Mesozoic geodynamic history are: 1) rifting leading to opening Maliac Ocean Late Anisian, 2) onset an east-dipping intra-oceanic subduction Early-Middle Jurassic sea-floor spreading a supra-subduction setting (Vardar Ocean), 3) formation ophiolitic mélanges trench-like...

A complete Jurassic succession, recording the evolution from platform margin to a deep-water basin, is exposed at Mt. Mangart in Julian Alps. The succession part of Nappe, where Southern Alps overlap with Dinarides. In Jurassic, area comprised south Tethyan passive continental margin. section was studied sedimentologically detail and dated radiolarians. It divided into five lithostratigraphic units: Unit 1: Lower shallow-water peloidal oncoidal limestones; 2: Pliensbachian distal shelf...

Abstract The objective of this work is to study the Mesozoic turbiditic sediments from southern Tethys margin in Iran. These are exposed as nappes Pichakun Mountains (i.e. Zagros Neyriz area), which inverted during latest Cretaceous time. Radiolarians used both define and date four main lithostratigraphic formations: (1) Bar Er Formation (undated, probably Late Triassic Early Jurassic); (2) Darreh Juve (Aalenian–early Bajocian middle Callovian–early Oxfordian); (3) Imamzadeh (middle...

A 95 m thick succession of grey siliceous limestone and marl on Mount Rettenstein in the Northern Calcareous Alps allowed us to study well-preserved diverse radiolarian assemblages across Sinemurian–Pliensbachian boundary. The distribution 31 most characteristic species is presented. Ammonites Jamesoni Subzone, topmost subzone Zone, have been previously found upper part section. data are complemented with calcareous nannofossil biostratigraphy, carbon strontium isotope analyses bulk...