Austrian Journal of Earth Sciences最新文献

{"title":"The Anina (Steierdorf) coal mining district in Banat (Romania) on some old geological maps (1850–1884)","authors":"Enikő Korodi, Z. Bartos-Elekes, I. Haidu","doi":"10.17738/AJES.2017.0016","DOIUrl":"https://doi.org/10.17738/AJES.2017.0016","url":null,"abstract":"","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67600132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An early würmian age for the inneralpine halldorf site, salzach valley, Austria","authors":"C. Spötl, H. Slupetzky, Ruth Drescher-Schneider, D. Festi, Andreas G Heiss, P. Reimer","doi":"10.17738/AJES.2017.0008","DOIUrl":"https://doi.org/10.17738/AJES.2017.0008","url":null,"abstract":"The Salzach Valley is one of the major valleys in the Eastern Alps which was occupied by a large ice stream during glacial maxima. In contrast to the Inn and Enns valleys, dated Pleistocene sediments predating the last glacial maximum are rare in the interior of this valley. The only known site is a former gravel pit near Halldorf, close to the conspicuous turn of the valley, where reworked lignite fragments were previously dated to 32 to 55 ka BP. In this study we re-examined these and additional lignite fragments in order to clarify the chronostratigraphic position of this site. Observations made at the time when the quarry was in operation showed that the lignite fragments were well rounded and compressed, and occurred in poorly sorted and poorly bedded deltaic foresets which lacked evidence of over-consolidation. The lignite also contains wood which is also compressed. Radiocarbon analyses performed on twelve individual wood samples yielded 14 infinite C dates (with one exception) indicating that they were most likely older than the Middle Würmian. Pollen showed high arboreal pollen percentages including Picea (dominant), Alnus, Pinus, as well as low percentages of Quercus, Fagus, Abies and Corylus in some samples. Osmunda was also found in some samples. Wood anatomical studies performed on fourteen samples revealed a dominance of Pinus, which, however, likely reflects the poorer preservation potential of soft wood genera such as Picea. The pollen data confirm the radiocarbon dates and document the former presence of a forest vegetation, consistent with Early Würmian records from the northern alpine rim including Mondsee. Although the pollen data do not permit to unequivocally assign these lignite samples to a known stratigraphic interval, they favour a First Early Würmian Interstadial age, whereby different samples record different parts of this long period during which the former peat bog formed. Strong compaction of the peat and wood probably reflects ice loading during the last glacial maximum, while subsequent erosion, transportation and re-deposition by meltwater streams occurred during the deglaciation phase. Das Salzachtal ist eines der großen Täler der Ostalpen und beherbergte einen großen Eisstrom wähernd glazialer Maxima. Im Gegensatz zum Innund Ennstal sind datierte pleistozäne Sedimente aus der Zeit vor dem Hochwürm im Inneren dieses Tales sehr selten. Die einzige bislang bekannt gewordene Lokalität ist eine ehemalige Kiesgrube bei Halldorf, nahe dem markanten Knick des Tales, wo aufgearbeitete Lignitgerölle gefunden wurden, die auf 32-55 ka BP datiert wurden. In der vorliegenden Studie wurden diese und weitere Lignitkomponenten neu untersucht um deren chronostratigraphische Stellung zu klären. Feldbeobachtungen aus der Zeit, als die Kiesgrube noch zugänglich war zeigen, dass die Lignitgerölle gut gerundet und stark kompaktiert waren und in schlecht sortierten und schlecht geschichteten Deltakiesen eingebetten waren, die ihrersei","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":"107-119"},"PeriodicalIF":1.7,"publicationDate":"2017-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48078817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrographic coded model concept for the correlation between geomechanical and elastic properties and its application on log data for Alpine rocks","authors":"N. Gegenhuber, Thomas Schifko, G. Pittino","doi":"10.17738/AJES.2017.0007","DOIUrl":"https://doi.org/10.17738/AJES.2017.0007","url":null,"abstract":"The derivation of geomechanical properties, like the rock strength, from elastic properties is an important topic not only in the oil industry, but also for geothermal projects, tunnelling or mining. It is one of the crucial parameters for the stability of the borehole, the drilling rate or stability of an underground mine. The idea of applying the petrographic model concept which involves an additional mineralogical influence was developed for the correlation between compressional wave velocity and uniaxial compression strength for sandstone, limestone, anhydrite and gypsum. The first step of this model is to define or assume the solid matrix properties of the dense host material, which covers therefore the influence of the rock type/lithology. The second step implements fractures/cracks with an inclusion model. Samples are selected from the surface and from borehole. A newly measurement set-up was developed to measure velocities during the uniaxial compression test. Additionally, the application of the derived equations on log data is tested. The presented correlations using the petrographic coded model concept shows good first results. Correlation between uniaxial compression strength and compressional wave velocity can be derived using the petrographic coded model concept (inclusion and defect model). The derived equations can easily be applied on log data and also deliver good results for the uniaxial compression strength in the borehole. Die Ableitung geomechanischer Parameter, wie die Gesteinsfestigkeit, von elastischen Eigenschaften, ist nicht nur in der Ölindustrie, sondern auch für Geothermie Projekte, im Tunnelbau oder im Bergbau, von großem Interesse. Es ist eine der Kerngrößen für die Stabilität des Bohrlochs, der Bohrgeschwindigkeit oder der Stabilität eines Untertagebergbaues. Die Idee der Anwendung des petrographisch kodierten Modelkonzeptes, welches zusätzlich den Mineraleinfluss beinhaltet, wurde für die Korrelation zwischen Kompressionswellengeschwindigkeit und einaxialer Druckfestigkeit für Sandstein, Kalkstein, Anhydrit und Gips entwickelt. Der erste Schritt dieses Models ist es, die Matrixwerte von der dichten Materialmasse, welche den Einfluss des Gesteinstyps/der Lithologie beinhaltet, zu bestimmen oder anzunehmen. Der zweite Schritt implementiert Risse/Brüche mit einem Inklusionsmodel. Es wurden Oberflächenproben und Bohrkerne ausgewählt. Ein neuer Messaufbau wurde entwickelt um Geschwindigkeiten währen eines einaxialen Druckversuches zu messen. Zusätzlich wurde die Anwendung der abgeleiteten Gleichungen an Bohrlochdaten getestet. Die hier präsentierten Korrelationen unter Verwendung des petrographisch kodierten Models zeigen erste gute Ergebnisse. Korrelationen zwischen einaxialer Druckfestigkeit und Kompressionswellengeschwindigkeit können mit dem Model (Inklusionen und Defekt Model) abgeleitet werden. Die Gleichungen können weiter leicht an Bohrlochdaten angewendet werden und erste Ergebnisse liefern gute Werte für die","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"29 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67600100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineralogical composition of the Baumkirchen lacustrine sequence (Würmian, Inn Valley, Tyrol): provenance and palaeogeographical implications","authors":"S. Barrett, D. Schmidmair, C. Spötl","doi":"10.17738/AJES.2017.0004","DOIUrl":"https://doi.org/10.17738/AJES.2017.0004","url":null,"abstract":"","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-parameter petrophysical characterization of Variscan greisen rocks from the Southern Bohemian Batholith (Austria) and the Eastern Erzgebirge Volcano-Plutonic Complex (Germany)","authors":"Edith Müller-Huber, F. Börner","doi":"10.17738/AJES.2017.0006","DOIUrl":"https://doi.org/10.17738/AJES.2017.0006","url":null,"abstract":"Understanding the variation and correlation between physical properties of ore bodies of interest is vital for every exploration project. Therefore comprehensive petrophysical laboratory measurements on representative sample material from two dispersemineralized greisen bodies of the Southern Bohemian Batholith (Austria) and the Eastern Erzgebirge Vulcano-Plutonic Complex (Germany), respectively, are presented in this study. As many greisen bodies host mineral deposits of economic interest, the aim of the study was to identify petrophysical properties which are suitable for distinguishing greisen bodies from the surrounding rocks. The gathered physical information (density, porosity, velocity, magnetic susceptibility, gamma spectroscopy, electrical resistivity, spectral induced polarization (SIP)) indicates that a differentiation of mineralized greisen zones of interest from the surrounding rocks is only possible based on a combined investigation of several parameters. Elevated grain and bulk densities (mean: 3 2.75 g/cm and 2.67 g/cm , respectively) are indicative of the Erzgebirge low-porosity (mostly < 3%) mineralized greisen rocks in comparison to the lower densities of the surrounding Teplice rhyolite and albite granite. Bulk density, however, is critically influenced by porosity and is therefore not suitable to distinguish the Austrian greisen rocks from the surrounding two-mica granites, 3 despite the greisens’ comparably high grain density (mean: 2.74 g/cm ). Their higher porosity (mean: 5.7%) also results in lower elastic wave velocities (mostly < 2900 m/s) and lower electrical resistivities (mostly < 2100 Ohmm) than the surrounding rocks. The electrical resistivities and elastic wave velocities of the German greisen samples are, in contrast, rather variable with no distinct level above or below the neighboring rocks. Magnetic susceptibility also delivers a good contrast between the greisens and their surrounding rocks as it is highly responsive to elevated mica contents or the presence of oxidic ore minerals. If quartz content predominates or oxidic ores are absent, however, there is no contrast in the magnetic susceptibility of the greisens and the surrounding rocks. With regard to natural gamma radiation, the greisens are characterized by generally low absolute readings as well as low U counts, while K and Th counts seem to be dependent on mica type. Results from SIP measurements suggest that especially phase information can be used to adequately differentiate greisen zones associated with Li-mineralization from country rocks in the Erzgebirge. In Austrian greisen rocks, however, the characteristics of the SIP spectra are less distinct. A crossplot of the real vs. the imaginary part of complex conductivity, however, is suitable for identification of rocks with high mica content. Based on these results a combined investigation of density, magnetic susceptibility, and spectral gamma seems to be most promising for identification of greis","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbonate cementation in Upper Eocene clastic reservoir rocks from the North Alpine Foreland Basin (Austria)","authors":"Marie-Louise Grundtner, D. Gross, R. Gratzer, D. Misch, R. Sachsenhofer, L. Scheucher","doi":"10.17738/AJES.2017.0005","DOIUrl":"https://doi.org/10.17738/AJES.2017.0005","url":null,"abstract":"A strong relationship between carbonate precipitation and microbial gas generation is evident for the Upper Eocene reservoir rocks of the North Alpine Foreland Basin. To achieve a better understanding of this relationship, 40 samples of limnic to shallow marine, gas-, oiland water-bearing sandstones were studied to determine mineralogy and diagenetic history. The specific mineral parageneses were used to reconstruct changes in the hydrogeochemical conditions over time. Thus, authigenic mineral phases within reservoir rocks are an important archive for the reconstruction of pore fluid composition changes. The eogenetic pore space evolution of investigated Eocene sandstones is influenced by their primary mineralogy, which is strongly controlled by (i) depositional environment, (ii) detrital input and (iii) transport distances. Thus, a low compositional maturity is associated with high feldspar and high clay mineral content. Authigenic clay minerals, formed during several stages of diagenesis, play an important role for reservoir quality, due to pore space reduction. During eogenesis, authigenic micritic and sparitic carbonate phases are precipitated, which decreases the pore space. These eogenetic carbonate cements exhibit isotope values of about δ C: -5.9 to +2.2‰ and O: -8.3 to -4.3‰ [VPDB]. Some of these sam18 ples indicate a trend towards lighter δ O values (-17.2‰), which is attributed to meteoric flush. Within the Eocene sandstones, two types of strongly cemented zones with low permeabilities can be differentiated: (i) extraordi13 nary light δ C (-28.4‰) carbonates, which formed due to degradation of organic matter at the stage of advanced sulfate reduc13 13 tion and (ii) heavy δ C (δ C: +8.7‰), which precipitated at the fermentation zone. Within the reservoir sandstones telogenesis is characterized by mineral destabilization (e.g. carbonate and feldspar corrosion) and kaolinite precipitation. The formation of authigenic kaolinite booklets resulted into a decrease in porosity. _____________________ ________________________________________________ ____________________________ ______________________________________ ________________ 13 18 δ Austrian Journal of Earth Sciences Vienna DOI: 10.17738/ajes.2017.0005 1)*) 1) 1) 1) 1) Marie-Louise GRUNDTNER , Doris GROSS , Reinhard GRATZER , David MISCH , Reinhard F. SACHSENHOFER &","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Turonian–Santonian sediments in the Tatricum of the Považský Inovec Mts. (Internal Western Carpathians, Slovakia)","authors":"O. Pelech, J. Hók, Š. Józsa","doi":"10.17738/AJES.2017.0002","DOIUrl":"https://doi.org/10.17738/AJES.2017.0002","url":null,"abstract":"The first description of Upper Cretaceous (“Senonian”) mass flow deposits discovered in the Striebornica section, in the central part of the Považský Inovec Mts. (Tatricum, Western Carpathians) is provided. The studied section is situated above the Poruba Formation (Albian – Lower Cenomanian) of the Tatricum tectonic unit (the Inovec succession) and below the Fatricum tectonic unit represented by the Triassic sediments. The mass flow deposits which are here classified as the Hubina Formation (new name) can be divided into three parts. The basal part is formed by calcareous pebbly mudstones and polymictic conglomerates. The middle part of the succession is composed predominantly of claystone or shale with minor sandstone interbeds. The upper part represents thickening-upward sandstone beds. The preserved post-early Turonian association of planktonic foraminifers extracted from the basal and middle part of the succession refer to a latest middle Turonian–Santonian age. The position of the Hubina Formation indicates post-Santonian emplacement of the Fatricum in the western segment of the Western Carpathians. The Hubina Formation is interpreted to be a part of the wedge-top basin overlapping the Tatricum.__","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On late Santonian ammonites from the Hofergraben Member (Gosau Group, Upper Cretaceous, Austria)","authors":"H. Summesberger, W. Kennedy, P. Skoumal","doi":"10.17738/AJES.2017.0009","DOIUrl":"https://doi.org/10.17738/AJES.2017.0009","url":null,"abstract":"Figure 1: A. Schematic geological map of the Eastern Alps. Occurrences of Gosau Group sediments (black), brick symbol: Northern Calcareous Alps. After Summesberger et al. (2017a). B. Local sketch map of parts of the Gosau Basin, with modifications after Summesberger et al. (2017a) indicating the localities mentioned in the text._______________________________________________________________ Abstract 11 ammonite are described from the upper Santonian of the Hofergraben site (Gosau Group; Upper Austria): Pachydiscidae gen. et sp. indet. juv., Placenticeras polyopsis (Dujardin, 1837), Placenticeras paraplanum Wiedmann, 1978, Placenticeras aff. maherndli Summesberger, 1979, Texanites quinquenodosus Redtenbacher, 1873, Eulophoceras jacobi Hourcq, 1949, Jouaniceras hispanicum Wiedmann, 1994, ? Jouaniceras sp., Eubostrychoceras acuticostatum (d’Orbigny, 1842), Glyptoxoceras crispatum (Moberg, 1885), Baculites fuchsi Redtenbacher, 1873. Jouaniceras hispanicum Wiedmann, 1994 and Eubostrychoceras acuticostatum (d’Orbigny, 1842) are recorded for the first time from the Gosau Group confirming the close connection with the Upper Cretataxa","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using Free/Libre and Open Source Software in the Geological Sciences","authors":"D. Mader, B. Schenk","doi":"10.17738/ajes.2017.0010","DOIUrl":"https://doi.org/10.17738/ajes.2017.0010","url":null,"abstract":"In the Geological Sciences, as in any other academic field, computers and software aided work are essential tools. Although Free and Open Source software is largely used in academic institutions for several purposes it is not yet state-of-the-art for the everyday usage. The usage of free and open source software is, besides the freedom of its ease of use, distribution, and modification, also recommended due to the increasing financial burden. There are many suited and effective alternative free software applications to the most common used proprietary commercial ones. Many common work steps can even be done entirely with the free operating system Linux. A selection of free software applications is compiled which are useful for geoscientific data evaluation and presentation. The provided information aims to lower the threshold of reservations against a potential migration and gives an overview about currently available alternative software useful in the Geological Sciences. In den geologischen Wissenschaften, wie auch in allen anderen Disziplinen, sind Computer, sowie softwareunterstützte Tätigkeiten, längst unverzichtbare Werkzeuge. Obgleich Freie und Open Source Software in vielen speziellen Einsatzgebieten verbreitet ist, wird diese noch nicht umfassend für den täglichen Gebrauch benutzt. Die Verwendung von Freier und Open Source Software ist, neben der Freiheit sie uneingeschränkt nutzen, verteilen und modifizieren zu können, auch wegen zunehmender budgetärer Einschränkungen zu empfehlen. Mit diesem Artikel möchten wir die geologische Gemeinschaft auf die vielen geeigneten Programme hinweisen, die als Alternativen zu den üblicherweise häufig benutzten proprietären, kommerziellen Programmen existieren. Viele alltägliche computergestützte Aufgaben können auch zur Gänze mit dem freien Betriebsystem Linux durchgeführt werden, ohne Einbußen in Funktionalität oder Professionalität befürchten zu müssen. Eine ausgewählte Liste geowissenchaftlich interessanter freier Anwendungen wird durch Referenzen ergänzt. Dieser Artikel soll über die Möglichkeiten freier alternativer Software informieren, die Zurückhaltung vor einer eventuellen Migration mindern, sowie einen Überblick über die aktuell verfügbare freie geowissenschaftliche Software geben. _______________________________ ______________________________________________________________","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"46 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A model of dinoflagellate cyst distribution around the K/Pg boundary and its paleoenvironmental implications (Eastern Alps)","authors":"O. Mohamed, W. Piller","doi":"10.17738/AJES.2017.0003","DOIUrl":"https://doi.org/10.17738/AJES.2017.0003","url":null,"abstract":"A new model was developed for the paleogeographic distribution of dinoflagellate cysts across the Cretaceous/Paleogene (K/Pg) boundary. Four sections in the Eastern Alps were studied. The Knappengraben and Gamsbach sections are located in the Gosau Basin of Gams, Austria. They are continuous across the boundary and represent a bathyal environment. The Waidach section north of Salzburg (Austria) contains neritic deposits of the Helvetic unit but shows a hiatus at the boundary. The Goppling section between Teisendorf and Oberteisendorf (Bavaria, Germany) belongs to a turbidite-rich, deep-water system (Ultrahelvetic unit), and is considered to be continuous across the boundary. The occurrence and distribution of dinoflagellate cysts in these sections suggests that Trabeculidinium, Adnatosphaeridium, Spiniferites, Pterodinium, Impagidinium, Achomosphaera and Codoniella are restricted to bathyal environments, whereas Areoligera, Manumiella and Trithyrodinium are restricted to the neritic environment. The abundance of Manumiella and Trithyrodinium indicate a high nutrient supply. Hystrichosphaeridium -dominated assemblages have been recorded in both neritic and bathyal environments. Two Manumiella spikes were recorded only at Waidach and interpreted to reflect slight coolings of oceanic surface waters. In the Danian, acme of Spongodinium delitiense are recorded ~1 m above the K/Pg boundary in the neritic and bathyal environments. These acmes could reflect a slight cooling of surface waters in the earliest Danian. The palynofacies analysis in the Gams Basin reveals a high abundance of amorphous organic matter in the Maastrichtian, and black phytoclasts in the Danian, which indicates intensified terrigenous run-off in the Danian with higher sea-floor oxygenation. In the Waidach section, palynomorphs are much more abundant, indicating a shelf to basin transitional area with dysoxic-anoxic conditions at the sea-floor. Austrian Journal of Earth Sciences Vienna DOI: 10.17738/ajes.2017.0003 A model of dinoflagellate cyst distribution around the K/Pg boundary and its paleoenvironmental implications (Eastern Alps) 1)*) 2) Omar MOHAMED & Werner E. PILLER 1) Faculty of Science, Geology Department, Minia University, El-Minia, Egypt; 2) Institute of Earth Sciences (Geology and Palaeontology), University of Graz, Heinrichstrasse 26, 8010 Graz, Austria; *) Corresponding author, omar.mohamed@mu.edu.eg Dinoflagellate cysts; palynofacies; Cretaceous/Paleogene; Eastern Alps","PeriodicalId":49319,"journal":{"name":"Austrian Journal of Earth Sciences","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67599599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}