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Papers by Hans-Jürgen Gawlick

31st IAS Meeting of Sedimentology, Jun 1, 2015

Geomechanik Und Tunnelbau, Aug 1, 2015

In the Falkenstein und Spering tunnels (A9 Pyhrn Autobahn; Northern Calcareous Alps), hydrocarbon... more In the Falkenstein und Spering tunnels (A9 Pyhrn Autobahn; Northern Calcareous Alps), hydrocarbon contents (HC Index) in excess of the permitted threshold values were detected in the course of the routine statutory analysis of the excavated material. Comparative detailed geochemical analysis of retained reference samples, operational consumables and core samples from boreholes drilled into the tunnel wall show that threshold values of HC indices in the Reifling Limestone are exceeded due to the presence of locally generated natural hydrocarbons. The hydrocarbons were probably formed in marly zones of the carbonate rocks and migrated into the well‐developed fracture network. These hydrocarbons are characterized by high contents of n‐alkanes, high Ts/(Ts+Tm) ratios, a predominance of C27 and C29 steranes, and the lack of oleanane. Traces of hydrocarbons in the Wetterstein Limestone contain oleanane due to contamination by operating consumables.

Annales g?ologiques de la Peninsule balkanique

In the late Middle to early Late Jurassic carbonate-clastic Sirogojno Melange in the Zlatibor Mou... more In the late Middle to early Late Jurassic carbonate-clastic Sirogojno Melange in the Zlatibor Mountain there is one roughly 35 m thick overturned block with an intact Late Triassic fore-reefal Dachstein Limestone succession studied for its biostratigraphic age, content and microfacies characteristics. The succession starts with coarse-grained rudstones followed by meter-sized reefal blocks intercalated in partly layered resedimented grainstones and packstones with abundant reef-building organisms like calcareous sponges, corals and encrusting organisms. Inside this part of the succession open-marine influenced layers are rare. The succession continues with a partly turbiditic sequence and chaotic rudstones, densely packed with reef-derived material like broken reefbuilding organisms and shallow-water material like gastropods, bivalves and foraminifers. Grainstones with clear open-marine influence (e.g., thin-shelled bivalves, crinoids, conodonts) appear in between those rudstones, i...

Geosystems and Geoenvironment

Occurrences of the Albian/Cenomanian Boundary Event (OAE1d, namely Breistroffer ... more Occurrences of the Albian/Cenomanian Boundary Event (OAE1d, namely Breistroffer Level), reflected in a series of four distinct positive d13C excursions (peak in the latest Albian) are until now not described in Serbia even various associations of late Early Cretaceous ammonite faunas are known from several locations in central Serbia. These ammonite-bearing sedimentary rocks are exposed in the narrow belt of the Belgrade-Kosmaj-Topola-Gledi&#263; Mts. above shallow-water orbitolinid foraminifera-bearing limestones (carbonate ramp deposits). Near village Kotra&#382;a (22 km SE of Topola) a roughly 20 m thick sedimentary succession of sand- and siltstones, marls and claystones with intercalated volcanic rocks and two distinct ammonite bearing horizons is preserved (&#698;Stragari facies&#698; in the Serbian literature). In the lower &#8211; roughly 11 m thick - more coarse-grained part of the succession occur beside belemnites, gastropods, and plant remains, a rich, but poor to moderately preserved ammonite fauna in slump deposits together with coarse eruptive volcanic material: Kossmatella agassiziana, Puzosia (Puzosia) mayoriana, Mortoniceras (Subschloenbachia) perinflatum, Anisoceras perarmatum, Anisoceras sp., Idiohamites elegantulus, Mariella sp., &#160;Ostlingoceras cf. puzosianum, and Scaphites (Scaphites) sp. The occurrence of Praeschloenbachia perinflatum indicates the Upper Albian Mortoniceras perinflatum Zone. Upsection a fining-upward trend indicates ongoing deeping of the depositional realm due to the stepwise sea-level rise from the late Albian onwards and the decease of the orbitolinid-bearing carbonate ramp. In the more fine-grained and slightly organic-rich silt to fine-sand layers approx. eight meters above the first ammonite-bearing level following ammonite fauna indicate the uppermost Albian to lowermost Cenomanian (Arrhaphoceras briacensis Zone or Stoliczkaia dispar Zone): Phylloceras (Hypophylloceras) velledae, Kossmatella agassiziana, Puzosia (Puzosia) mayoriana, Beudanticeras sp., Mortoniceras sp., Stoliczkaia (Stoliczkaia) dispar, Mariella sp., and Scaphites (Scaphites) sp. Whereas in the Western Tethys Realm the latest Albian OEA1d is mainly characterized by the deposition of organic-rich fine-grained sediments, in central Serbia west of the Drina-Ivanjica continental realm more coarse-grained sediments were deposited. However, the occurrence of the younger ammonite-rich interval in slightly organic-rich sedimentary rocks mirror the global late Albian OAE1d, whereas the older ammonite-rich intervall is a precursor event associated with intense volcanic activity near to the study area. This intense volcanic activity led to the regional drowning of the shallow-water orbitolinid foraminifera-bearing carbonate ramp and creates relief as indicated by the slump deposits. It is proposed that in central Serbia regional and global events work in concert to form in the late Albian deeper-water environment ammonite-rich horizons, which have the potential for a correlation of late Albian events in the Dinarides and adjacent areas. In the frame of the IGCP 710 &#8222;Western Tethys meets Eastern Tethys&#8220;.

In the Dinarides the reef rim to the open marine deep-water depositional realm (... more In the Dinarides the reef rim to the open marine deep-water depositional realm (outer shelf) of the Late Triassic Dachstein Carbonate Platform is not known. On the road from Gradac to &#352;ula near to the village Poros a more than 120 m thick far travelled and overturned Late Triassic succession of reefal to bedded siliceous limestones was studied (biostratigraphy, microfacies). The section is slightly tectonic overprinted, with slump deposits in the central and upper part. The section starts with a roughly 20 m thick reefal to fore-reefal limestone succession with deep-water matrix in the upper part (Lacian 2 in age with following conodonts: E. rigoi, E. abneptis). Near the base the reefal limestone is think-bedded to massive (rudstones), higher up in the section various bedded. We attribute these fore-reefal limestones as part of the Late Triassic Dachstein Limestone, interestingly with a deepening upward sequence from the middle Lower Norian onwards. Around the Lacian 2-3 boundary the depositional characteristics changed relatively abrupt from reefal-rudstones to bedded siliceous limestones intercalated by few and turbidite layers containing shallow-water debris. The next, 30 m thick part of the succession consists of dm-bedded limestones with chert nodules and layers, grey limestones and reddish limestones (radiolarian-filament wackestones), in parts with slump intercalations or medium-grained microbreccias. Conodont dating show that the age this part of the section is Lacian 3 to Alaunian 1-2 in the upper part (dated by E. spatulata to E. slovakensis) probably reaching the Alaunian 3. The Alaunian 3 to Sevatian (with E. bidentata) is characterized by a thick series of slump deposits with carbonate turbidite intercalations. Upsection follow polymictic breccias (debris flows) and microbreccias (turbidites) with older open-marine hemipelagic components, as proven by conodonts. The overlying dm-bedded grey-reddish siliceous limestones with red chert nodules are Rhaetian in age dated by the appearance of M. hernsteini. Upsection 5-10 cm-bedded grey siliceous and slightly marly limestones (in a thickness of less than 20 m) follow, overlain by roughly 10 m thick dm-bedded red-grey siliceous limestones with red marl to claystone intercalations, in the lower part with slump deposits, again overlain by 5-10 cm-bedded grey siliceous and slightly marly limestones. An exact age of this part of the series could not be determined, only conodont multielements could be isolated from this part of the succession. The age is most likely Rhaetian 2-3, but earliest Jurassic for highest parts of the sequence cannot be excluded. The higher Lacian to Late Norian part of the succession corresponds to the reef-near facies belt in open shelf position, known in the type-area in the Northern Calcareous Alps as Gosausee Limestone facies. However, the section Poros shows during the Norian a general deepening trend during the time span Lacian 3 to the end of the Rhaetian opposite of the well-known platform margin in the Northern or Southern Alps. In the Dinarides a backstepping of the reef belt in the late Early Norian result in a drowning unconformity of the Early Norian part of the long-living Dachstein Carbonate Platform. &#160;

31st IAS Meeting of Sedimentology, Jun 1, 2015

Geomechanik Und Tunnelbau, Aug 1, 2015

Annales g?ologiques de la Peninsule balkanique

Geosystems and Geoenvironment