Now showing 1 - 10 of 59
  • Publication
    Relative Sea-Level Changes on the Southwestern Arabian Gulf since the Last Glacial Maximum
    ( 2022) ; ;
    Damien Arhan
    Several works have been carried out regarding Late Pleistocene–Holocene sea-level changes in the Arabian Gulf. Nevertheless, a global and regional approach is still lacking, and some critical issues remain unsolved. In this paper, a review and a reinterpretation of all published data regarding sea-level changes in the area have been completed and compared with new results obtained from fieldworks carried out in Failaka Island, Kuwait, and in Abu Dhabi Emirate, United Arab Emirates. This work relies mostly on studying geomorphological sea-level indicators, such as beach rocks and beach ridges besides combining archaeological data. Results show different trends in vertical movement within the studied area since the Last Glacial Maximum, which cannot be explained alone by the existing sea-level model, implying different, specific and local factors, such as tectonic deformations and diapirism.
      52  2
  • Publication
    Karst development in different tectonic settings (Middle East, Greece, South China), concept analysis and first findings towards hydrology modeling reconsideration
    ( 2022) ;
    Moraetis, Daniel
    ;
    Fassoulas, Charalambos
    ;
    Mattern, Frank
    ;
    Scharf, Andreas
    ;
    Yu, Xuan
    ;
    Pennos, Christos
    ;
    Adamopoulos, Kostas
    ;
    Zacharias, Stylianos
    ;
    Hamdan, Hamdan
    ;
    Nikolaidis, Nikolaos
      13  1
  • Publication
    Glaciations on ophiolite terrain in the North Pindus Mountains, Greece: New geomorphological insights and preliminary 36 Cl exposure dating
    ( 2022) ;
    Leontaritis, Aris
    ;
    Marrero, Shasta
    ;
    Ribolini, Adriano
    ;
    Hughes, Philip
    ;
    Spagnolo, Matteo
    A glacial geomorphological analysis of three valleys on Mt. Mavrovouni (North Pindus Mountains, Greece) is presented alongside a pilot study using cosmogenic 36 Cl to obtain surface exposure ages from iron-rich ophiolite glacial and periglacial boulders. At least three distinct morphostratigraphic units of glacial (moraines) and periglacial (relict pronival ramparts) origin have been identified. Four 36 Cl surface exposure ages were obtained from the stratigraphically youngest glacial and periglacial deposits. Although this limited dataset with relatively large uncertainties cannot support a robust geochronology, the ages are consistent with the 36 Cl-based chronologies of limestone-derived moraines on Mt. Tymphi (NW Greece) and Mt. Chelmos (S Greece), confirming that the last glaciers on this massif formed during the Last Glacial Maximum as also indicated by other studies in the Pindus mountains. At the same time it provides confidence in the suitability of 36 Cl dating for iron-rich samples, such as ophiolites, using an updated 36 Cl model that incorporates improved production rates for iron spallation. The presented preliminary chronology of moraines and pronival ramparts is based on those ages as well as on local and regional morphostratigraphic correlations. The stabilisation of the most extensive Late Pleistocene glaciers took place during the Last Glacial Maximum, at 27.0 ± 6.5 ka whereas the presence of pronival ramparts dated at 20.2 ± 4.8 ka suggests persisting cold and arid conditions. Older, still undated glacial deposits exist lower in the valleys which can be attributed to the Middle Pleistocene major glaciation phases (MIS 12/MIS 6), based on their relative morphostratigraphic position within the glacial sedimentary sequence.
      8
  • Publication
    Geomorphology of the Kalamas river delta (Epirus, Greece)
    ( 2022) ;
    Adrien Gonnet
    ;
    Eric Fouache
    ;
    Charles Lecoeur
    This article presents the geomorphological mapping of the Kalamas river delta in Thesprotia (Epirus, north-western Greece). The Kalamas (also known as Thyamis) is one of the three main deltas of this region. Detailed mapping was performed through analysis of field geomorphological surveys and interpretation of old maps, satellite images, aerial photos, and DEM. The evolution of the delta as well as its current morphology derives from complex interactions between alluvial, marine dynamics and human activities. Several palaeo-channels have been identified, and the recent morphology of the delta has been altered by the construction of a dam and the canalization of the river during the second half of the twentieth century. The coastline is complex, and mainly consists of lagoons, sandy barriers and sand spits. Since part of the delta has been prograding for about fifty years, the current dynamics indicate erosion as well as progressive submersion of these low coasts.
      24  2
  • Publication
    Searching for a Martian soil simulant in UAE & Al Hajar Mountains-First simulants CUOS and MUOS
    ( 2021) ;
    Fikri, Mira
    ;
    Alhazba, Ali
    ;
    Pracejus, Bernhard
    ;
    Fernini, Illias
    ;
    Manousakis, Antonios
    ;
    Suleiman, Bashir
    ;
    Shameer, Mohamed
    ;
    Moraetis, Daniel
    This study presents the first results for creating a Martian soil simulant from rocks in UAE and Al Hajar mountains including Sultanate of Oman. The Martian soil composition is now well known from rover missions and it is a regolith of oceanic crust composition (basaltic). The presence of the most extensive oceanic crust in parts Al Hajar mountains (Semail Ophiolites) is a triggering fact to search the possibility to create Martian soil simulants. Inhere we have collected 13 samples from volcanic basalts, gabbro harzburgite laterites and we assessed the mineral composition. We demonstrate the mixing process of the various rocks to create soil simulants. We have created two simulants, CUOS and MUOS following the compositions of Curiosity Mission measurements and MMS-1 soil simulant supplied by the Martian Garden company. The CUOS soil simulant showed moderate to good fitting in the mineralogy with the Curiosity Mission analysis in Rocknest Portage, while we were not able to attain similar mineralogical composition between MUOS and MMS-1 due to lower plagioclase content in our samples.
      4
  • Publication
    Paleoenvironmental Evolution and Sea Level Change in Saronikos Gulf (Aegean Sea, Greece) : Evidence from the Piraeus Coastal Plain and Elefsis Bay Sedimentary Records
    Thorough faunal (benthic foraminifera, ostracods, molluscs) and palynomorph analyses as well as magnetic susceptibility measurements performed on the Piraeus coastal plain sedimentary sequences have shed light on the paleoenvironmental evolution of the area since ca. 9000 cal BP. Benthic and palynomorph assemblages along with magnetic susceptibility suggest a typical lagoonal environment with significant freshwater inputs at the eastern part of the plain after 8700 cal BP. Between 7500 and 5400 cal BP, microfaunal assemblages, mollusc fauna and magnetic susceptibility suggest a shallow marine paleoenvironment, with Piraeus forming a tied island in the center of the bay. Since ca. 4800 cal BP a closed oligohaline lagoon is evidenced in the western part of the Piraeus plain further developed to a marsh after 2800 cal BP, while a coastal environment associated with the fluvio-deltaic system of Kifissos and Korydallos Rivers is continually developing to the west. Signs of cultivation and grazing activities in the area are evidenced since the Early Bronze Age, culminating during the Classical Period. A comparison with a well-dated marine record, recovered from the nearby shallow Elefsis Bay, provides a reasonable estimation of ~5 mm/yr for the absolute sea level rise rate in the inner Saronikos Gulf during the Mid-Holocene.
    Scopus© Citations 3  48  2
  • Publication
    Review on Late Pleistocene-Holocene relative sea-level changes in Kuwait : New evidence from Failaka island
    (Wiley, 2021)
    New results from fieldwork carried out on Failaka island testify to relative sea-level fluctuations during Late Pleistocene and Holocene. This study is based on analysing, sampling and dating geomorphological sea-level indicators, including beach ridges or beachrocks. The results have been compared and harmonised with recalibrated data from pre-existing literature to reconstruct the relative sea-level local chronology. The vertical displacement identified may have induced coastline mobility and significant environmental changes and impacted the human occupation in Failaka and along the coastal areas of Kuwait. Eventually, the results highlight the impact of large-scale crustal deformations on regional relative sea-level variations.
    Scopus© Citations 2  159  4
  • Publication
      58  2