scholarly journals Middle Pleistocene seismically induced clay diapirism in an intraplate zone, western Brittany, France

2018 ◽  
Vol 91 (1) ◽  
pp. 301-324
Author(s):  
Brigitte van Vliet-Lanoë ◽  
Christine Authemayou ◽  
Stéphane Molliex ◽  
Michael Hugh Field ◽  
Manfred Frechen ◽  
...  
Keyword(s):  
Western Europe ◽  
Luminescence Dating ◽  
Middle Pleistocene ◽  
Tectonic Structures ◽  
Shallow Water Table ◽  
Factors Affecting ◽  
Oxygen Isotope Stage ◽  
Plate Convergence ◽  
Infrared Stimulated Luminescence ◽  
Bay Of Brest

AbstractThe Brittany region of France is located in a low seismicity intraplate zone. Most of the instrumented earthquakes are limited to a shallow crustal depth without surface rupture. A paleoseismological analysis was performed on deposits on the Crozon Peninsula and in the Elorn estuary. We highlight hydroplastic deformations induced by liquefaction leading to clay diapirism, which were likely triggered by past earthquakes. This diapirism seems to be frequent in continental nonconsolidated sediments and to develop on the inherited tectonic structures, when a shallow water table and confining layers exist. Timing of deformation is dated using paleoenvironmental data, and electron spin resonance and infrared-stimulated luminescence dating methods. Two seismic periods were identified in western Europe during early Marine Oxygen Isotope Stage (MIS) 10 (~380 ka) and early MIS 8 (~280–265 ka). The lack of similar deformations affecting the Holocene tidal deposits in the Bay of Brest suggests that the magnitude of the triggering paleoearthquakes is probably higher (Mw~6) than the recent events (Mw5.4). These unusual intraplate major paleoearthquakes need specific factors affecting the far-field crustal stress loading to be triggered, such as a brief acceleration of the Africa-Eurasia lithospheric plate convergence, glacio-isostatic stress perturbations associated with the onset of major glaciations in northern Europe, or other processes induced by orbital forcing.

Geochronology of Middle and Upper Pleistocene Loess Sections in Hungary

1997 ◽  
Vol 48 (3) ◽  
pp. 291-312 ◽  
Author(s):  
Manfred Frechen ◽  
Erzsébet Horváth ◽  
Gyula Gábris
Keyword(s):  
Accumulation Rate ◽  
Luminescence Dating ◽  
Glacial Cycle ◽  
Last Interglacial ◽  
High Accumulation ◽  
Oxygen Isotope Stage ◽  
Infrared Stimulated Luminescence ◽  
Derivatives Of ◽  
Very High ◽  
The Last Glacial

The application of both thermoluminescence and infrared stimulated luminescence dating to the extensively studied “classical” Hungarian loess/paleosol sequences from Basaharc, Mende, and Paks provides a reliable chronological framework and climatostratigraphic reconstruction for the last interglacial/glacial cycle. Based on this combined luminescence dating study a new chronology is proposed for the “Young Loess” in Hungary. Luminescence dating suggests that the loess below the MF2 horizon formed during the penultimate glaciation. The MF1 horizon probably formed during an interstade within oxygen isotope stage 3. For the youngest loess, overlying MF1, a very high accumulation rate was determined. Large time gaps occur above MF2 and MF1, indicating that most of the record of the last glaciation is missing in the standard sections at Basaharc, Mende, and Paks. Either large discontinuities or a very low accumulation rate occurred in all three type sections during the soil-forming periods. High-resolution studies of climatic proxies using this combined luminescence dating approach provide a reliable chronological framework for loess and loess derivatives of the last glacial cycle in Hungary, although a precise and complete chronostratigraphic reconstruction cannot be achieved from the incomplete records found at these sites.

scholarly journals Extended range luminescence dating of quartz and alkali-feldspar from aeolian sediments in the eastern Mediterranean

2020 ◽  
Author(s):  
Galina Faershtein ◽  
Naomi Porat ◽  
Ari Matmon
Keyword(s):  
Eastern Mediterranean ◽  
Alkali Feldspar ◽  
Luminescence Dating ◽  
Early Pleistocene ◽  
Middle Pleistocene ◽  
Infrared Stimulated Luminescence ◽  
Aeolian Sediments ◽  
Extended Range ◽  
Recent Developments ◽  
Minimum Age

Abstract. Optically stimulated luminescence (OSL) on quartz is an established technique for dating late Pleistocene to late Holocene sediments. Unfortunately, this method is often limited to up to 100 ka (thousands of years). Recent developments in new extended range luminescence techniques show great potential for dating older sediments of middle and even early Pleistocene age. These methods include thermally transferred OSL (TT-OSL) and violet stimulated luminescence (VSL) for quartz and post infrared-infrared stimulated luminescence (pIRIR) for feldspar. Here we investigate the luminescence behavior of the TT-OSL, VSL and pIRIR signals of quartz and feldspar minerals of aeolian sediments of Nilotic origin from the eastern Mediterranean. We sampled a 15 m thick sequence (Kerem Shalom) comprising sandy calcic paleosols, which is part of a sand sheet that covers an extensive region in south-western Israel. Dose recovery and bleaching experiments under natural conditions indicated that the pIRIR250 signal is the most suitable for dating the Nilotic feldspar. Luminescence intensity profiles revealed natural saturation of the three signals at the same depth of ~6 m, indicating that ages of samples below that depth are minimum ages. Using TT-OSL and pIRIR250, a minimum age of 715 ka, for the base of the section was obtained, suggesting aeolian sand accumulation along the eastern Mediterranean coastal plain already since the early Pleistocene. Our results indicate that both TT-OSL and pIRIR250 can accurately date middle Pleistocene aeolian sediments of Nilotic origin and that minimum ages can be provided for early Pleistocene samples.

scholarly journals Methodological Aspects on Luminescence Dating of Fluvial Sands from the Moselle Basin, Luxembourg

2010 ◽  
Vol 35 (-1) ◽  
pp. 67-74 ◽  
Author(s):  
S. Cordier ◽  
M. Frechen ◽  
S. Tsukamoto
Keyword(s):  
Western Europe ◽  
Luminescence Dating ◽  
Dose Determination ◽  
Infrared Stimulated Luminescence ◽  
Lower Terrace ◽  
Minimum Age ◽  
Age Model ◽  
Methodological Aspects ◽  
Selection Of ◽  
Good Agreement

Methodological Aspects on Luminescence Dating of Fluvial Sands from the Moselle Basin, LuxembourgOptically stimulated luminescence (OSL) dating of quartz and infrared-stimulated luminescence (IRSL) dating of feldspar were applied to fluvial sands from the lower terrace (M1) of the Moselle valley in Luxembourg (western Europe). The dating results indicated that the aggradation period for the sediments from below the M1 alluvial terrace can be correlated to the Weichselian upper Pleniglacial (MIS 2), which is in good agreement with the general chronostratigraphy of the Moselle terrace staircase. The ages were obtained from small aliquots of quartz and feldspars, using the single aliquot regenerative (SAR) protocol. The equivalent dose determination included a series of tests and the selection of the Minimum Age Model as the most appropriate statistical model. This made it possible to provide a reliable methodological background for further luminescence dating of fluvial sediments from the Moselle basin.

Palaeolithic Art in Isolation: The Case of Sicily and Sardinia

2007 ◽  
Author(s):  
Margherita Mussi
Keyword(s):  
Cervus Elaphus ◽  
Western Europe ◽  
Middle Pleistocene ◽  
Upper Palaeolithic ◽  
Oxygen Isotope Stage ◽  
Faunal Assemblages ◽  
Late Upper Palaeolithic ◽  
Intermittent Connection ◽  
The Alps ◽  
Palaeolithic Art

The archaeological record of Italy is long and complex, suggesting continuous peopling since the Middle Pleistocene (Mussi 2001; Mussi et al. in press). The evidence of Palaeolithic art, however, is rather restricted: Early Upper Palaeolithic (EUP) art is close to nil, including just a few notched implements; the Middle Upper Palaeolithic (MUP), admittedly, is much richer, with some twenty Gravettian Wgurines, the largest such sample in Western Europe (Mussi et al. 2000; Mussi 2004); parietal art is also documented at Grotta Paglicci, where painted horses and positive handprints were discovered (Boscato and Palma di Cesnola 2000; Zorzi 1962); when Late Upper Palaeolithic (LUP) lithic industries were produced which belong to the Epigravettian, portable and parietal art is known at a number of sites. In the late 1980s, Zampetti (1987) reviewed twenty-one Epigravettian cave sites, and a single open-air site, all of them with zoomorphic art. Three more have been discovered since: Riparo Dalmeri, Riparo di Villabruna, and Grotta di Settecannelle. I will examine below the artistic record of Sicily and Sardinia, both of them at the periphery of Italy, which, in turn, is secluded from Europe by the Alps. My aim is to contrast the effects of geographic isolation, with the circulation of people and ideas, if any, as documented by portable and cave art. Sicily, currently an island of 25; 700km<sup>2</sup> and the largest in the Mediterranean, lies 140 km from Africa, and a few kilometres off southern Italy. The strait of Messina is 3 to 25 km wide, but is far from easy to cross, because of violent tidal currents, and whirlpool, also known as ‘Charybdis’ by Greeks and Romans. The depth is just 72 m at the Sill of Peloro. Because of intense neotectonic activity, however, any palaeogeographic reconstruction is highly speculative. Analysis of the faunal assemblages, which during oxygen isotope stage (OIS) 2 include a limited number of species, none of which is endemic, suggests that intermittent connection with the mainland possibly existed around the Last Glacial Maximum (Mussi et al. in press). The large mammals, found in varying percentages, are the deer, Cervus elaphus, the aurochs, Bos primigenius, the small steppe horse, Equus hydruntinus, and Sus scrofa, the wild boar.

scholarly journals New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tiziana Sgroi ◽  
Alina Polonia ◽  
Graziella Barberi ◽  
Andrea Billi ◽  
Luca Gasperini
Keyword(s):  
Lateral Displacement ◽  
Tectonic Setting ◽  
Plate Boundary ◽  
Velocity Model ◽  
Tectonic Deformation ◽  
Accretionary Wedge ◽  
Tectonic Structures ◽  
Plate Convergence ◽  
Seismogenic Layer ◽  
Regional Tectonic

AbstractThe Calabrian Arc subduction-rollback system along the convergent Africa/Eurasia plate boundary is among the most active geological structures in the Mediterranean Sea. However, its seismogenic behaviour is largely unknown, mostly due to the lack of seismological observations. We studied low-to-moderate magnitude earthquakes recorded by the seismic network onshore, integrated by data from a seafloor observatory (NEMO-SN1), to compute a lithospheric velocity model for the western Ionian Sea, and relocate seismic events along major tectonic structures. Spatial changes in the depth distribution of earthquakes highlight a major lithospheric boundary constituted by the Ionian Fault, which separates two sectors where thickness of the seismogenic layer varies over 40 km. This regional tectonic boundary represents the eastern limit of a domain characterized by thinner lithosphere, arc-orthogonal extension, and transtensional tectonic deformation. Occurrence of a few thrust-type earthquakes in the accretionary wedge may suggest a locked subduction interface in a complex tectonic setting, which involves the interplay between arc-orthogonal extension and plate convergence. We finally note that distribution of earthquakes and associated extensional deformation in the Messina Straits region could be explained by right-lateral displacement along the Ionian Fault. This observation could shed new light on proposed mechanisms for the 1908 Messina earthquake.

Seasonal and water-depth variations in sediment luminescence and in sedimentation from sediment trap samples at Gerlache Strait, Antarctic Peninsula

2009 ◽  
Vol 21 (5) ◽  
pp. 483-499 ◽  
Author(s):  
Glenn W. Berger ◽  
Sara Ante ◽  
Eugene W. Domack
Keyword(s):  
Sediment Trap ◽  
Trap Depth ◽  
Dry Mass ◽  
Luminescence Dating ◽  
Fine Silt ◽  
Sediment Fluxes ◽  
Depositional Processes ◽  
Infrared Stimulated Luminescence ◽  
Depositional Controls ◽  
Susceptibility Profiles

AbstractSediment trap arrays were deployed in Brialmont Cove and Andvord Bay, eastern Gerlache Strait, from December 2001–March 2003. The recovered sediments (representing instantaneous deposition from the viewpoint of luminescence dating) encompass all the annual and local glaciomarine depositional processes. Magnetic susceptibility profiles were used to infer seasonality in the trap cores, and thus to select subsamples for luminescence measurements. Multi-aliquot infrared stimulated luminescence (IRSL) apparent ages were used to assess the effectiveness of ‘clock zeroing’ (by daylight) of light sensitive luminescence within fine silt polymineral samples from each trap depth. IRSL apparent ages for 24 samples indicate that the largest age-depth differences occur with the autumn season samples at both trap sites, suggesting a previously unrecognized and regional (within the Gerlache Strait) change in depositional controls in the autumn compared to other seasons. The apparent ages also indicate some differences between the fjords, and a more complex oceanographic regime at Andvord Bay than at Brialmont Cove. Dry-mass sediment fluxes varied from 0.4 to 0.7 g cm-2 yr-1, with the largest flux at Brialmont Cove (∼0.7 g cm-2 yr-1) occurring in the bottom trap, whereas at Andvord Bay, the largest flux (∼0.6 g cm-2 yr-1) occurred in the middle trap (∼45 m above seafloor).

Sedimentology, faunal content and pollen record of Middle Pleistocene palustrine and lagoonal sediments from the Peri-Adriatic basin, Abruzzi, eastern central Italy

2016 ◽  
Vol 86 (3) ◽  
pp. 359-372 ◽  
Author(s):  
Pierluigi Pieruccini ◽  
Claudio Di Celma ◽  
Federico Di Rita ◽  
Donatella Magri ◽  
Giorgio Carnevale ◽  
...  
Keyword(s):  
Shallow Water ◽  
Sea Level ◽  
Central Italy ◽  
Freshwater Wetlands ◽  
Middle Pleistocene ◽  
Pollen Record ◽  
Vegetation Development ◽  
Oxygen Isotope Stage ◽  
Open Forest ◽  
Facies Succession

AbstractA 25 m-thick outcrop section exposed at Torre Mucchia, on the sea-cliff north of Ortona, eastern central Italy, comprises a rare Middle Pleistocene succession of shallow-water and paralic sediments along the western Adriatic Sea. An integrated study of the section, including facies and microfacies analyses, and characterization of paleobiological associations (mollusks, fishes, ostracods, foraminifers and pollen), enable a detailed reconstruction of the paleoenvironmental and paleoclimatic conditions during deposition. The shallow-water deposits include a transgressive, deepening- and fining-upward shoreface to offshore-transition facies succession overlain by a regressive shoreface-foreshore sandstone body with an erosive base and a rooted and pedogenically altered horizon at the top that imply deposition during sea-level fall. This forced regressive unit is overlain by paralic strata forming a transgressive succession comprising palustrine carbonates and back-barrier lagoonal mudstones. The palustrine carbonates exhibit some of the typical features encountered in palustrine limestones deposited within seasonal freshwater wetlands (marl prairies). Following the sea-level rising trend, the freshwater marshes were abruptly replaced by a barrier-lagoon system that allowed deposition of the overlying mud-rich unit. Within these deposits, the faunal assemblages are consistent with a low-energy brackish environment characterized by a relatively high degree of confinement. The pollen record documents the development of open forest vegetation dominated by Pinus and accompanied by a number of mesophilous and thermophilous tree taxa, whose composition supports a tentative correlation with Marine Oxygen Isotope Stage 17. The new pollen record from Torre Mucchia improves our understanding of the vegetation development in the Italian Peninsula during the Middle Pleistocene and sheds new light on the role played by the most marked glacial periods in determining the history of tree taxa.

Facies Composition and Stratigraphic Position of the Quaternary Upper Yenisei Sequence in the Tuva and Minusa Depressions

2021 ◽  
Vol 62 (10) ◽  
pp. 1127-1138
Author(s):  
I.D. Zol’nikov ◽  
I.S. Novikov ◽  
E.V. Deev ◽  
A.V. Shpansky ◽  
M.V. Mikharevich
Keyword(s):  
Late Pleistocene ◽  
Lacustrine Sediments ◽  
Alluvial Fan ◽  
Luminescence Dating ◽  
Middle Pleistocene ◽  
Mountainous Area ◽  
Gorny Altai ◽  
Stratigraphic Position ◽  
Geochronological Dating ◽  
Current Ripples

Abstract —The paper concerns the sediment sequence, which is widespread in the Yenisei valley and in the Tuva and Minusa depressions and also present in the valleys of the southern Chulym plain. The sediments of this sequence were previously described as “Neogene mud-shedding”, as well as moraines, alluvial fan deposits, alluvium of Middle Pleistocene high terraces, and lacustrine sediments. The giant ripple marks on the Upper Yenisei terraces was commonly interpreted as ribbed moraines; however, in recent studies, these ridges have been repeatedly referred to as marks of giant current ripples. Besides, some recently published papers provide description of geology of this sequence fragments suggesting its deposition by cataclysmic floods. Geomorphological analysis of the area shows Pleistocene glaciers to have been localized within the medium–high mountainous areas. The glaciers did not reach the Tuva and Minusa depressions and occupied large areas only in the Todzha basin and on the periphery of the Darkhat basin, forming a glacial dam at its outlet, which resulted in glacial-dammed lakes filling the basin completely. These lakes outburst, and the resultant flooding led to the deposition of megaflood sediments, which we refer to here as the Upper Yenisei sediment sequence. A detailed analysis of its facies architecture revealed similarity of these sediments to those of the Sal’dzhar and Inya sequences in Gorny Altai. Most of the Upper Yenisei megaflood sediments are localized in topographic lows of the Tuva and Minusa depressions. Beyond the Altai–Sayan mountainous area, the megaflood sediments of the Upper Yenisei sequence compose high terraces of the Yenisei, Chulym, Chet’, and Kiya rivers in the southern Chulym plain. The formation of Upper Yenisei sequence dates to the first half of the Late Pleistocene, inasmuch as it contains inset alluvial sediments of the second terrace of the Yenisei River. The available data allow suggesting that the Upper Yenisei sequence formed in the first Late Pleistocene regional glaciation. The Sal’dzhar sequence in Gorny Altai and the fourth terrace of the Ob’ River on the Fore-Altai plain are stratigraphic analogs of the Upper Yenisei sequence. The Upper Yenisei and Sal’dzhar sequences can thus be considered future regional markers serving as a link for the local stratigraphic schemes of the Altai–Sayan mountainous area and adjacent West Siberian plains. The results obtained call for verification by geochronological dating, first of all, by modern luminescence dating methods covering a wider chronological interval than radiocarbon dating.

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