Bulletin of the Geological Society of Greece最新文献

{"title":"The palaeogeographic distribution of stromatolites in the Parnassus zone, Central Greece, during the early to middle Paleocene","authors":"Ν. Solakius, M. KATl","doi":"10.12681/BGSG.17356","DOIUrl":"https://doi.org/10.12681/BGSG.17356","url":null,"abstract":"The stromatolites recorded in the Parnassus Zone, central Greece, were developed in shallow waters (tidal flat conditions) that prevailed in the central areas of the zone during the early to middle Paleocene. In the margins, deeper water prevailed during this interval which enabled the deposition of pelagic limestones. The wide geographic distribution of the stromatolites in the zone probably depended on the lack of organisms feeding on them, climatic factors, salinity of coastal waters and sediment supply. They further acted as post massextinction disaster forms inhabiting the shallow water areas after the extinction of the rudists at the end of the Cretaceous","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85235958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New findings of fossil large mammal remains in the Penios valley (Area of Larissa, Thessaly, Greece)","authors":"A. Athanassiou","doi":"10.12681/BGSG.17087","DOIUrl":"https://doi.org/10.12681/BGSG.17087","url":null,"abstract":"Fossil large mammal remains that come from the Penios valley, Thessaly, are described and compared to already known specimens. The studied material includes two elephant mandibles, tusk fragments and limb bones, as well as a part of a large bovid skull. On the basis of morphology and biometry the sample is taxonomically referred to the species Elephas antiquus and Bos primigenius. An Upper Pleistocene age is assumed.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76711320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Other coiling changes in Globoratalia Acostaensis unknown till now in Mediterranean area","authors":"S. Prillo, J. Mehaj, J. Prillo","doi":"10.12681/BGSG.17092","DOIUrl":"https://doi.org/10.12681/BGSG.17092","url":null,"abstract":"In this study, all samples from Tortonian to Early Pliocene sediments of Zvernec-Vlora and Kavaja-Durres regions within Peri-Adriatic Foredeep (PAF) of Albania containing Globorotalia acostaensis were studied qualitatively and quantitatively. Based on these analyses resulted that G. acostaensis have changed coiling ratio direction during G. acostaensis and G. obliquus extremus Zone of Tortonian, differently from that known in Mediterranean area up to now. This is not a short time interval, which more exactly is from the first appearance of G. acostaensis to first appearance of G. suterae, at the upper part of G. extremus Zone. Another documented and explaining unconformity here is related with beginning of Pliocene sediments. There are at least four alienating sinistral and dextral coiling changes in G.acostaensis populations. Also in this work is given the history of the study of G acostaensis and which maybe causes that this species in Mediterranean province and especially in our country is used relatively late as zonal marker species. The main object of stratigraphers and paleontologists has been finding a successive section, with uninterrupted sedimentation, possibly for the longest geological time. Regarding to this phenomenon could be explained resulting unconformity between coiling ratio changes in Globorotalia acostaensis of the present study and other studies carried out in Mediterranean area on this occasion up to now. It is difficult to understand here the resulting unconformity during the main part of Tortonian age, which prolonged more than 2 m.y. Another resulting unconformity discovered at the Miocene/Pliocene boundary of the Kavaja-Durres regions is very significant. In these regions was discovered an earlier Pliocene sedimentation than known up to now according to resulting alternations of coiling direction of Globorotalia acostaensis prior to Pliocene Sphaeroidinellopsis Acme zone. These data are in favour of those based on the isotopie stratigraphy, which give a new definition at 5.32 M.Y. Miocene/Pliocene boundary instead of 5.1 or 5.2 M.Y. given previously based on absolute age. Coiling changes, in our case that of G. acostaensis are in response to changing climates or alternation of different cold and warm water populations resulting from changes in the boundaries between water masses as at the beginning of the Pliocene when the water masses of the Atlantic Ocean overflowed the Mediterranean area. Here is also proposed to correct the Neogene paleoclimatic curve referring, for the interval of G. acostaensis range distribution.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91028779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late quaternary sedimentation in the Balearic basin","authors":"Ο. Τσαλκιτζη, Γ. Αναστασακησ","doi":"10.12681/BGSG.17351","DOIUrl":"https://doi.org/10.12681/BGSG.17351","url":null,"abstract":"A detailed sedimentological study has been performed on five long piston cores recovered from the Balearic Abyssal Plain, the largest plain in the Mediterranean Sea. All the cores were dominated by multiple turbidite sequences, most of them displaying pronounced upward fining. The presence of a megaturbidite bed representing a single depositional event is observed in all the cores. Biostratigraphic correlation of the interlayered pelagic beds, using a high resolution nannofossil zonal scheme, suggests that the sediments in the cores date back to 50-100kyrs BP and that the age of the megabed is less than 50kyrs BP. The sedimentation rates for the last 50kyrs (over 50cm/Kyr) are greater in the northern and central Balearic Plain as compared to the lower sedimentation rates of 40cm/Kyr in the southern margin of the plain. Sedimentation rates (9,7-13,4cm/Kyr) are significantly reduced in the time interval between 50-120kyrs. The emplacement of the megaturbidite and the minor turbidites coincide with the sea level low stands. During these periods, great part of the continental shelf was revealed and processes sush as erosion, transportation and position became more intense.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88517764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The study of the microstructures of clay sediments: a case study of marly sediments from N. Péloponnèse","authors":"Τ.Α. Χριστοδουλοπούλου, Παναγιώτα Σ. Τσώλη-Κατάγα, Γεώργιος Χ. Κούκης, Νικόλαος Κοντόπουλος","doi":"10.12681/bgsg.17352","DOIUrl":"https://doi.org/10.12681/bgsg.17352","url":null,"abstract":"This paper deals with the systematic study of the microstructural characteristics of clay sediments. These characteristics which are closely connected to the physical and mechanical character of the sediments, are concerned with: a)the structural constituents, b)the microporosity and c)the structural bonds of the sediments. For the determination of the structural characteristics of clay sediments the Scanning Electron Microscope (SEM) and the Optical Microscope are widely used with a supplementary mineralogical analysis of sediment components and the determination of several physical and mechanical characteristics. The observations under the microscope must be focused on the distribution of mineralogical facies and micropores, on the size and shape of clay (micro-)aggregates, as well as on the kind of authigenic facies (e.g. micrite, sparry calcite) which play the role of cementing material. The proposed methodology was applied to the study of the microstructures of marly sediments from Northern Péloponnèse and the following types of microstructures were determined: a)matrix-skeletal, mixed type, coarse dispersed of low orientation, b)matrix, coagulative, medium dispersed of medium orientation and c)crystallized-cementated, fine or medium dispersed of low orientation.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72738223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The presence of marin Pliocene sendiments in the Mesohellenic Trough (Pramoritsa banks, Grevena, Greece)","authors":"Ι. Φουντούλης, Α. Μαρκοπούλου-Διακαντώνη, Αθηνά Μπακοπούλου, Ελένη Μωραΐτη, Μ. Ρ. Μιρκου, Χ. Σαρόγλου","doi":"10.12681/bgsg.17108","DOIUrl":"https://doi.org/10.12681/bgsg.17108","url":null,"abstract":"Detailed lithostratigraphic study of the postalpine deposits that build Pramoritsa river banks - tributary of Aliakmonas river- north of Grevena (Greece), showed that the marine molassic deposition did not cease in the Upper Miocene but continued in the Lower Pliocene, too. Systematic sampling revealed abundant pelagic and benthic fossils, the presence of which {Bulimina exilis, Bulimina costata, Neogloboquadrina acostaensis, Globigerinella pseudobesa, Globoquadrina venezuelana, Neoeponides schreibersii, Pulleniatina obliquiloculata, Dorothia gibbosa) proves that marine facies went on, at least, until the Lower Pliocene and that the depositional environment was characterized as coastal with warm waters. According to the Nannoplankton flora correlated with standard nannoplankton -zones-subzones NNllb Amaurolithus delicatus, Discoaster quinqueramus) and NN13 (Ceratolithus rugosus) of MARTINI, 1971 and OKADA & BUKRY, 1980 during the Late Miocene -Early Pliocene. Besides, some characteristics of the Pliocene sediments are described, based on macro- and microscopic observations.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74954117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The contribution of tidal currents in the sedimentation of the Strait of Avlida, Southern Evoikos Gulf (Greece)","authors":"Σ. E. Πουλοσ, Π. Γ. Δρακοπουλοσ, Σ. Ν. Λεονταρησ, Ε. Τσαπακησ, Ε. Χατζηγιαννη","doi":"10.12681/BGSG.17350","DOIUrl":"https://doi.org/10.12681/BGSG.17350","url":null,"abstract":"The investigated area of Avlida (northern part of the South Evoikos Gulf), which obtained its present shape within Holocene, is characterised by shallow water depths (<12 m) and the presence of muddy sediments. The hydrological regime of the area is governed mainly by the tide (sea level fluctuation 0.25-0.4 m). The water column (in April 1998) found to be almost homogeneous with temperature and salinity to increase progressively with depth from 13.7 °C and 34.1 psu (surface) to 14.1 °C and 35.7 psu (near bed). Suspended sediment concentrations varied between 1 and 4 mg/1 with the highest values observed above the seabed (4-8 mg/I). These values of suspended sediment are relatively high when compared with other coastal areas, as that of Thermaikos Gulf (<1 mg/1). Furthermore, their presence is attributed primarily to the action of tidal currents assisted periodically by the wave activity and human interference i.e. navigation. Especially the high near bed values are associated with the near-bed activity of the tidal currents, which having usually velocities > 11 cm/s apply to the seafloor bottom shear velocities capable of causing resuspension of the surficial muddy sediments and inhibiting final deposition of the suspensates. Therefore, the fine-grained sediments are resuspended and subsequently advected by the tidal currents and eventually distributed all over the study area. Finally, the relatively coarse-grained sediments found to be more abundant at the southern part are related to the deltaic progradation within historical times of the torrential rivers Mégalo Rema and Lilantas which form the south-end part of the strait of Avlida.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90776735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sequence stratigraphy, quaternary basin analyses in the Adriatic Foredeep","authors":"S. Guri, L. Gjani, S. Ranxha, M. GURl, A. Xhaxhiu","doi":"10.12681/bgsg.17117","DOIUrl":"https://doi.org/10.12681/bgsg.17117","url":null,"abstract":"This paper intends to give the characterization of Quaternary loose deposits, near and along the sea coast zone, by evaluating lithological-geologic parameters, depositional environments and the tectonic subsidence. The main objectives are: - The lithologic-facial zone by mapping of lithologie composition and facies distribution. - The Quaternary basin analyses by interpreting depositional sequences of third order, where system tracts (lowstand, shelf wedge, transgressive and highstand) are individualized. - The present fluvial processes and delta configuration (Shkumbin, Seman).","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"131 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75316566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depositional environments of tertiary turbiditic sediments in Metsovo Basin, NW Greece","authors":"G. Ananiadis, A. Zelilidis","doi":"10.12681/BGSG.17353","DOIUrl":"https://doi.org/10.12681/BGSG.17353","url":null,"abstract":"Tertiary sediments in Metsovo area consist of submarine fan turbidite deposits accumulated in the proximal part of the basin and represent mostly inner fan. The most proximal part of the inner fan could be related to a shelf environment. Palaeocurrent data indicate mainly two directions. The main direction is SW and results mainly from groove marks. The second direction represents an WNW trend which results mainly from flute marks. The Metsovo area seems to have multiple feeders from North and East. The total thickness of the turbiditic deposits in Metsovo area is approximately 6800 m due to tectonic stacking and folding.","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72853332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New data on the Dogger - Cenomanian stratigraphy of Tripolitza series in Central Crete","authors":"Α. Ζαμπετακη Λεκκα, Α. Αλεξοπουλοσ","doi":"10.12681/BGSG.17096","DOIUrl":"https://doi.org/10.12681/BGSG.17096","url":null,"abstract":"","PeriodicalId":9519,"journal":{"name":"Bulletin of the Geological Society of Greece","volume":"6 1","pages":"565"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81351610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}