Ugur Kagan Tekin

LONGOBARDIAN (MIDDLE TRIASSIC) ENTACTINARIAN AND NASSELLARIAN RADIOLARIA FROM THE DINARIDES OF BOSNIA AND HERZEGOVINA

Abstract Abundant and well-preserved radiolarians are reported from a limestone sample taken from near the town of Fojnica, southern Bosnia and Herzegovina. A late late Ladinian age is assigned to this sample based on the index species Spongoserrula fluegeli and Muelleritortis cochleata and associated radiolarian fauna. As a result of taxonomic studies on the entactinarian and nassellarian fauna of this sample, three species (Pseudostylosphaera multispinata, P. oblonga, and P. procera) from the suborder Entactinaria, and 18 species (Bulbocyrtium cordeyi, B.? longobardicum, Goestlingella goricanae, G. pseudoillyrica, Monicasterix ornata, M. parvisegmentata, M. pulchra, Nabolella brevispinosa, N. crenulata, N. trispinata, Ladinocampe dinarica, Spinotriassocampe praecarnica, Pseudosaturniforma ladinica, Pararuesticyrtium coniformis, P.? sanfilippoae, Conospongocyrtis bragini, Castrum blomei, and Triassocyrtium longum) from the suborder Nassellaria are described as new. Moreover, the genus Pseudosaturniforma is emended based on the new materials.

MIDDLE CARNIAN (LATE TRIASSIC) NASSELLARIA (RADIOLARIA) OF KÖSEYAHYA NAPPE FROM EASTERN TAURIDES, EASTERN TURKEY

Abundant, very diverse, and well-preserved Nassellarian fauna has been obtained from cherty/clayey limestone levels at the basal part of the Koseyahya nappe east of the town of Elbistan, Eastern Taurides. A comparison with the radiolarian faunas of Austria, Japan and Turkey allows us to assign a middle Carnian age to this radiolarian fauna from the Elbistan region. This fauna contains Nassellaria that are typical for this time interval. Moreover, it contains Tetraporobrachia haeckeli Kozur & Mostler which is an index fossil that gives the name to the zone established by Kozur & Mostler. As a result of the taxonomic study of the Nassellarian fauna, thirty-nine taxa among which nine new species ( Goestlingella tueysuezi, Haeckelicyrtium planum, Hinedorcus koeseyahyaensis, Katroma ? ornata, K. ? proba, K. ? tunoglui, Syringocapsa firma, S. nuda, Sanfilippoella carterae ) and twelve taxa remained in open nomenclature are described and figured in this study.

GEOCHEMICAL AND PETROLOGICAL CHARACTERISTICS OF LATE TRIASSIC BASIC VOLCANIC ROCKS FROM THE KOCALI COMPLEX; SE TURKEY: IMPLICATIONS FOR THE TRIASSIC EVOLUTION OF SOUTHERN TETHYS

The Kocali Complex in SE Anatolia is mainly composed of tectonically imbricated slices of pelagic rock suits (pelagic limestones; cherts; etc); platform carbonates; clastics; serpentinites and basic volcanics. It can be subdivided into four main parts as the Tarasa Unit; the Konak Unit; the Cilo Limestones and the Kale Ophiolite. In this paper; geochemical characteristics of basic volcanic rocks associated with pelagic sediments (radiolarian cherts; pelagic limestones; etc) have been studied along four stratigraphical sections (the Tarasa; the Bulam-2; the Korun-1 and the Korun-2) in the Konak and the Tarasa Units. The age of the volcanic sequences have been assigned to Late Triassic (middle Carnian to Rhaetian) based on the radiolarian data from the associated pelagic rock units. Geochemical data indicates the presence of two different types of Late Triassic volcanic rock groups characterized by E-MORB-type (Group-1 volcanites from the Tarasa Unit formed by mixing of OIB and MORB-type melts) and OIB-type (Group-2 volcanites from the Konak Unit) mantle sources. None of the samples from the Kocali Complex has characteristics of N-MORB type mantle source and was affected by crustal contamination. Based on these data; it can be suggested that all these volcanic rocks formed in a marginal oceanic basin away from the ocean ridge. The presence of Radiolaria and Bivalvia-bearing pelagic limestones and cherts associated to the basic volcanic rocks in the Kocali Complex also emphasize that they all formed in deep marine basin. Geochemical characteristics of Late Triassic volcanics in the Kocali Complex have great similarities and well-correlative to the coeval volcanics previously studied in the Southern Tethyan Belt (e.g. the Baer-Bassit region in NW Syria; the Mamonia Complex in SW Cyprus and the Antalya Nappes in SW Turkey). Taking into the consideration of the geochemical data obtained from Late Triassic basic volcanics in the Kocali Complex and geochemical characteristics of the coeval volcanics in the adjacent units in the Southern Tethyan Belt; it can be suggested that rifting age of the Southern Tethyan Oceanic Basin in SE Anatolia is probably earlier than early Late Triassic (middle Carnian time).

LATE LADINIAN (MIDDLE TRIASSIC) SPUMELLARIA (RADIOLARIA) FROM THE DINARIDES OF BOSNIA AND HERZEGOVINA

A limestone sample from southern Bosnia and Herzegovina near Fojnica town yielded extremely abundant and well-preserved radiolarians. The radiolarians are late Ladinian in age and clearly indicate the Spongoserrula fluegeli Subzone of Muelleritortis cochleata Zone based on the index forms and associated fauna. A highly diverse spumellarian fauna is described from this sample. Within the defined spumellarian fauna, five genera ( Ligulatubus, Tubospongopallium, Hexacatoma, Octostella and Discofulmen ) seventeen species ( Dumitricasphaera galeata, D. trialata, Spongostylus bosniensis, Spongopallium crassum, Ligulatubus yaoi, Tubospongopallium gracile, T. kozuri, T. tornatum, Archaeospongoprunum globosum, Veghicyclia cruciforma, V. krystyni, Hexacatoma elegantissima, H. nobleae, Octostella pulchra, Pentaspongodiscus similediscus , Discofulmen dumitricai, D. ishidai) are new.

Late Triassic (Early to Middle Norian) radiolarians from the Antalya Nappes, Antalya, SW Turkey

The Gökdere Formation of the Alakircay Nappe (Antalya Nappes) mainly consists of cherty limestone and limestone with calciturbidite intercalations. Moderately to well-preserved radiolarians were obtained from the Gökcam section of the Gökdere Formation located to the west of Antalya City, southwestern Turkey. The radiolarians of the Gökdere Formation obtained in this study are comparable to the faunas described from the Queen Charlotte Islands, British Columbia and the Antalya Nappes, southwestern Turkey. The age range of the radiolarians is late Early Norian to early Middle Norian based on the co-occurrence of Capnodoce serisa, Harsa siscwaiensis, Xiphosphaera fistulata and an associated fauna. Three species (Nodocapnuchosphaera altineri, Renzium whalenae and Enoplocampe(?) norica) and one subspecies (Kinyrosphaera helicata goekcamensis) are defined as new.