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  • 1
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    The geodynamic and limnological evolution of Balkan Lake Ohrid, possibly the oldest extant lake in Europe (2022)
    Details
    Publication Date: 2023-12-04
    Description: Studies of the upper 447 m of the DEEP site sediment succession from central Lake Ohrid, Balkan Peninsula, North Macedonia and Albania provided important insights into the regional climate history and evolutionary dynamics since permanent lacustrine conditions established at 1.36 million years ago (Ma). This paper focuses on the entire 584‐m‐long DEEP sediment succession and a comparison to a 197‐m‐long sediment succession from the Pestani site ~5 km to the east in the lake, where drilling ended close to the bedrock, to unravel the earliest history of Lake Ohrid and its basin development. 26Al/10Be dating of clasts from the base of the DEEP sediment succession implies that the sedimentation in the modern basin started at c. 2 Ma. Geophysical, sedimentological and micropalaeontological data allow for chronological information to be transposed from the DEEP to the Pestani succession. Fluvial conditions, slack water conditions, peat formation and/or complete desiccation prevailed at the DEEP and Pestani sites until 1.36 and 1.21 Ma, respectively, before a larger lake extended over both sites. Activation of karst aquifers to the east probably by tectonic activity and a potential existence of neighbouring Lake Prespa supported filling of Lake Ohrid. The lake deepened gradually, with a relatively constant vertical displacement rate of ~0.2 mm a−1 between the central and the eastern lateral basin and with greater water depth presumably during interglacial periods. Although the dynamic environment characterized by local processes and the fragmentary chronology of the basal sediment successions from both sites hamper palaeoclimatic significance prior to the existence of a larger lake, the new data provide an unprecedented and detailed picture of the geodynamic evolution of the basin and lake that is Europe’s presumed oldest extant freshwater lake.
    Keywords: ddc:551 ; Balkan Peninsula ; Lake Ohrid ; DEEP sediment succession ; Pestani succession ; evolutionary dynamics ; regional climate history
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
    Electronic Resource
    Electronic Resource
    North Pacific seasonality and the glaciation of North America 2.7 million years ago (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 433 (2005), S. 821-825 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the context of gradual Cenozoic cooling, the timing of the onset of significant Northern Hemisphere glaciation 2.7 million years ago is consistent with Milankovitch's orbital theory, which posited that ice sheets grow when polar summertime insolation and temperature are low. However, the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03332
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Palaeoclimatic implications of isotopic data from modern and early Holocene shells of the freshwater snail Melanoides tuberculata, from lakes in the Ethiopian Rift Valley (1999)
    Springer
    Journal of paleolimnology 21 (1999), S. 97-106 
    Details
    ISSN: 1573-0417
    Keywords: carbon and oxygen isotopes ; Melanoides tuberculata ; Ethiopian Rift Valley ; Holocene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Carbon and oxygen isotope ratios in the shells of the freshwater snail Melanoides tuberculata yield information on the isotopic composition of the water in which the shell was formed, which in turn relates to climatic conditions prevailing during the snails' life span. Melanoides is particularly important because it is widespread in Quaternary deposits throughout Africa and Asia and is ubiquitous in both fresh and highly evaporated lakes. Whole-shell and incremental growth data were collected from modern and fossil shells from two lakes in the Ethiopian Rift Valley. δ18O values in the modern shells from Lake Awassa are in equilibrium with modern waters, while δ18O values in subfossil shells from the margins of Lake Tilo indicate high rainfall during the early Holocene. Sequential analysis along the growth spiral of the shell provides information on seasonal or shorter-term variability of lake water during the lifetime of the organism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008079219280
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Late Quaternary palaeohydrology of the Konya Basin, Turkey, based on isotope studies of modern hydrology and lacustrine carbonates (1999)
    Springer
    Journal of paleolimnology 22 (1999), S. 187-204 
    Details
    ISSN: 1573-0417
    Keywords: stable isotopes ; authigenic carbonate ; ostracods ; palaeolimnology ; Konya Basin ; Turkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The Konya plain in south central Anatolia, Turkey, which is now largely dry, was occupied around the time of the Last Glacial Maximum by a fresh-oligosaline lake covering more than 4000 km2. Sediment cores from three residual water bodies (Pinarbaşi, Akgöl and Süleymanhaci) within the larger Pleistocene lake basin, have been analysed using a multidisciplinary approach. The sediment sequences are dated as spanning the last 50 Ka years, although breaks in sedimentation mean that there is only partial chronological overlap between them. Carbon and oxygen isotope analyses on lacustrine carbonate from the three cores give contrasting isotope profiles which reflect the different ages and independent hydrological behaviour of different sub-basins through the late Quaternary. Distinguishing changes that are regional from local effects is aided by modern isotope hydrology studies and by comparing the carbonate δ13C and δ18O values to diatom and other analyses undertaken on the same cores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008024127346
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    Paper (German National Licenses)
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  • 5
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    Relative abundances of diatoms in Lake Baikal sediment core CON01-603-5 (2005)
    PANGAEA
    Details
    Publication Date: 2023-07-09
    Keywords: Achnanthes profunda; Achnanthes striata; AGE; Aneumastus cf. tuscula; Aulacoseira ambigua; Aulacoseira baicalensis; Aulacoseira skvortzowii; Aulacoseira skvortzowii, resting spore; Cocconeis neodiminuta; Cocconeis neothumensis; Cocconeis placentula; Cocconeis placentula var. baicalensis; Cocconeis sp.; CON01-6; CON01-603-5; CONTINENT; Crateriportula inconspicua; Cyclostephanos dubius; Cyclotella antiqua; Cyclotella baicalensis; Cyclotella comtaeformica var. spinata; Cyclotella gracilis; Cyclotella iris var. insueta; Cyclotella minuta; Cyclotella ocellata; Cyclotella ornata; Cyclotella praetemperei; Cyclotella praetemperei var. distincta; Cyclotella sp.; Cyclotella stelligera; Cymbella sp.; DEPTH, sediment/rock; Diatom dissolution index; Diatoms, centrales indeterminata; Diatoms, pennales indeterminata; Diatoms, planktic; Diatoms, total, per unit sediment mass; Didymosphenia geminata var. baicalensis fo. curvata; Encyonema minuta; Epithemia sp.; Eunotia exigua; Eunotia sp.; Fragilaria capucina; Fragilaria constricta; Fragilaria heidenii; Fragilaria lata; Fragilaria sp.; Fragilariforma virescens; Geissleria acceptata; Gomphonema sp.; Gyrosigma sp.; High-resolution Continental Paleoclimate Record in Lake Baikal; KAL; Karayevia clevei; Kasten corer; Lake Baikal, Russia; Luticola mutica; Navicula farta; Navicula menisculus; Navicula sp.; Nitzschia sp.; Pinnularia borealis; Planothidium calcar; Planothidium lanceolatum; Planothidium oestrupii; Planothidium robustus; Pseudostaurosira brevistriata; Stauroforma exiguiformis; Staurosira construens var. binodis; Staurosira construens var. construens; Staurosira construens var. venter; Staurosira microstriata; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella pinnata; Stephanodiscus carconeiformis; Stephanodiscus flabellatus; Stephanodiscus formosus; Stephanodiscus formosus var. minor; Stephanodiscus grandis; Stephanodiscus parvus; Stephanodiscus skabitchevskyi; Stephanodiscus sp.; Surirella sp.; Synedra acus var. radians; Synedra parasitica; Synedra sp.; Tabellaria flocculosa; Tabellaria ventricosa; Vereshchagin
    Type: Dataset
    Format: text/tab-separated-values, 3321 data points
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    DATA PANGAEA
  • 6
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    Diatom concentration in Lake Baikal sediment core CON01-603-5 (2005)
    PANGAEA
    Details
    Publication Date: 2023-07-09
    Keywords: Achnanthes profunda; Achnanthes striata; AGE; Aneumastus cf. tuscula; Aulacoseira ambigua; Aulacoseira baicalensis; Aulacoseira skvortzowii; Aulacoseira skvortzowii, resting spore; Cocconeis neodiminuta; Cocconeis neothumensis; Cocconeis placentula; Cocconeis placentula var. baicalensis; Cocconeis sp.; CON01-6; CON01-603-5; CONTINENT; Crateriportula inconspicua; Cyclostephanos dubius; Cyclotella antiqua; Cyclotella baicalensis; Cyclotella comtaeformica var. spinata; Cyclotella gracilis; Cyclotella iris var. insueta; Cyclotella minuta; Cyclotella ocellata; Cyclotella ornata; Cyclotella praetemperei; Cyclotella praetemperei var. distincta; Cyclotella sp.; Cyclotella stelligera; Cymbella sp.; DEPTH, sediment/rock; Diatom dissolution index; Diatoms, centrales indeterminata; Diatoms, pennales indeterminata; Diatoms, planktic; Diatoms, total, per unit sediment mass; Didymosphenia geminata var. baicalensis fo. curvata; Encyonema minuta; Epithemia sp.; Eunotia exigua; Eunotia sp.; Fragilaria capucina; Fragilaria constricta; Fragilaria heidenii; Fragilaria lata; Fragilaria sp.; Fragilariforma virescens; Geissleria acceptata; Gomphonema sp.; Gyrosigma sp.; High-resolution Continental Paleoclimate Record in Lake Baikal; KAL; Karayevia clevei; Kasten corer; Lake Baikal, Russia; Luticola mutica; Navicula farta; Navicula menisculus; Navicula sp.; Nitzschia sp.; Pinnularia borealis; Planothidium calcar; Planothidium lanceolatum; Planothidium oestrupii; Planothidium robustus; Pseudostaurosira brevistriata; Stauroforma exiguiformis; Staurosira construens var. binodis; Staurosira construens var. construens; Staurosira construens var. venter; Staurosira microstriata; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella pinnata; Stephanodiscus carconeiformis; Stephanodiscus flabellatus; Stephanodiscus formosus; Stephanodiscus formosus var. minor; Stephanodiscus grandis; Stephanodiscus parvus; Stephanodiscus skabitchevskyi; Stephanodiscus sp.; Surirella sp.; Synedra acus var. radians; Synedra parasitica; Synedra sp.; Tabellaria flocculosa; Tabellaria ventricosa; Vereshchagin
    Type: Dataset
    Format: text/tab-separated-values, 3321 data points
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    DATA PANGAEA
  • 7
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    Percentages diatom abundances from Lake Palaeo-Makgadikgadi (Botswana) (2018)
    PANGAEA
    In:  Supplement to: Schmidt, Mareike; Fuchs, Markus; Henderson, Andrew C G; Kossler, Annette; Leng, Melanie J; Mackay, Anson W; Shemang, Elisha; Riedel, Frank (2017): Paleolimnological features of a mega-lake phase in the Makgadikgadi Basin (Kalahari, Botswana) during Marine Isotope Stage 5 inferred from diatoms. Journal of Paleolimnology, 58, 373-390, https://doi.org/10.1007/s10933-017-9984-9
    Details
    Publication Date: 2023-07-09
    Description: Diatoms from a 30-cm thick sedimentary unit have been sampled each 0.5 cm to reconstruct the late Pleistocene lake phase of Lake Palaeo-Makgadikgadi in the Middle Kalahari (Botswana).
    Keywords: Achnanthes exigua; Amphora copulata; Amphora frickei; Anomoeoneis sphaerophora; Aulacoseira; Aulacoseira ambigua; Campylodiscus clypeus; Cocconeis placentula; Cocconeis sp.; Craticula cf. elkab; Cyclotella meneghiniana; Cymatopleura solea; Cymbella cucumis; Cymbella cymbiformis; Cymbella pusilla; Denticula kuetzingii; DEPTH, sediment/rock; Diatoms indeterminata; Discostella stelligera; Discostella stelligeroides; Encyonema muelleri; Epithemia sorex; Eunotia diodon; Fragilaria cf. capucina; Frustulia rhomboides; Gomphonema angustatum; Gomphonema cf. clavatum; Halamphora thermalis; Halamphora veneta; Hantzschia amphioxys; Lake_Paleo-Makgadikgadi; Martyana martyi; Mastogloia elliptica; Navicula radiosa; Navicula scutelloides; Nitzschia cf. frustulum; Nitzschia gracilis; Nitzschia sp.; OUTCROP; Outcrop sample; Pinnularia esox; Pinnularia microstauron; Placoneis gastrum; Pseudostaurosira brevistriata; Rhopalodia gibba; Rhopalodia gibberula; Sellaphora pupula; Stauroneis phoenicenteron; Staurosira construens; Surirella engleri; Surirella ovalis; Synedra sp.; Tryblionella cf. hungarica
    Type: Dataset
    Format: text/tab-separated-values, 3000 data points
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    DATA PANGAEA
  • 8
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    Sea surface temperature estimation for the Blue Clay Formation at Ras il-Pellegrin (2013)
    PANGAEA
    Details
    Publication Date: 2023-07-07
    Keywords: AGE; Alkenone, unsaturation index UK'37; Calculated from Mg/Ca ratios; Calculated from UK'37 (Müller et al, 1998); Comment; Globigerinoides trilobus, magnesium/calcium ratio; Malta; OUTCROP; Outcrop sample; Ras_il-Pellegrin; Sea surface temperature, annual mean; SECTION, height
    Type: Dataset
    Format: text/tab-separated-values, 108 data points
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    DATA PANGAEA
  • 9
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    Carbon cycle modeling for the Blue Clay Formation at Ras il-Pellegrin (2013)
    PANGAEA
    Details
    Publication Date: 2023-07-07
    Keywords: -; AGE; Carbon dioxide, partial pressure; Malta; OUTCROP; Outcrop sample; Ras_il-Pellegrin; δ13C, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 264 data points
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    DATA PANGAEA
  • 10
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    Bulk organic carbon content and isotopic record from Lake Baikal sediment core CON01-603-5 (2005)
    PANGAEA
    Details
    Publication Date: 2023-07-07
    Keywords: AGE; Carbon, organic, total; Carbon/Nitrogen ratio; CON01-6; CON01-603-5; CONTINENT; DEPTH, sediment/rock; High-resolution Continental Paleoclimate Record in Lake Baikal; KAL; Kasten corer; Lake Baikal, Russia; Vereshchagin; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 300 data points
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    DATA PANGAEA
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