scholarly journals Paleomagnetism of the Plio-Pleistocene continental sediments from the north -eastern edge of the Fucino basin (Central Italy)

1995 ◽  
Vol 38 (3-4) ◽  
Author(s):  
L. Alfonsi ◽  
L. Sagnotti ◽  
F. Galadini
Keyword(s):  
Rock Magnetism ◽  
Central Italy ◽  
Normal Component ◽  
Natural Remanent Magnetization ◽  
Tectonic Activity ◽  
The North ◽  
North Eastern ◽  
Geodynamic Processes ◽  
Fucino Basin ◽  
Eastern Edge

The paleomagnetism of the Plio-Pleistocene continental sediments cropping out at the north-eastern edge of the Fucino extensionaI basin (Italy, Central Apennines) was investigated. The area is characterized by strong neo-tectonic activity and the original purpose was to investigate possibIe verticaI axis rotations in Plio-Pleisto- cene sediments, in order to improve the understanding of the recent geodynamic processes. Scarcity of suit- able outcrops limited sampling at 8 sites (83 specimens) from the north-eastern edge of the basin, in clay-rich intervals beIonging to two different sedimentary cycIes. The paleomagnetic resuIts pointed out a peculiar mag- netic behaviour common to the whole set of studied samples. The Natural Remanent Magnetization (NRM) is dominated by a vigcous normal component acquired under the influence of the present geomagnetic field, stable only below 200°C. Another (reverse) very weak component, stable at higher temperatures (up to 400°C), is present in most of the samples. This component can be precisely isolated for only 7 specimens from 3 different sites and therefore the information gained is not statistically sufficient for any tectonic reconstruction. Rock magnetism analyses showed a variable magnetic mineralogy j but the NRM carriers are not well represented in the artificial remanences produced in the laboratory. Results suggest that the natural viscous remanence is most likeIy carried by coarse multi-domain magnetite.

scholarly journals The geology of the north-eastern corner of Greenland - photogeological studies and 1993 field work

1994 ◽  
Vol 161 ◽  
pp. 21-33
Author(s):  
H.F Jepsen ◽  
J.C Escher ◽  
J.D Friderichsen ◽  
A.K Higgins
Keyword(s):  
Field Work ◽  
Tectonic Activity ◽  
Mobile Belt ◽  
North East ◽  
The North ◽  
Upper Proterozoic ◽  
North Eastern ◽  
Field Season ◽  
Upper Boundary ◽  
Middle Proterozoic

Late Archaean and Early Proterozoic crust-forming events in North-East and eastern North Greenland were succeeded by Middle Proterozoic sedimentation and volcanic activity; Late Proterozoic through Tertiary sedimentation was interrupted by several periods of tectonic activity, including the Caledonian orogeny in East Greenland and the Mesozoic deformation of the Wandel Hav mobile belt. Photogeological studies helped pinpoint areas of special interest which were investigated during the short 1993 field season. Insights gained during field work include: the nature of the crystalline basement terrain in the Caledonian fold belt, redefinition of the upper boundary of the Upper Proterozoic Rivieradal sandstones, revision of Caledonian nappe terminology, and the northern extension of the Caledonian Storstrømmen shear zone.

Charophytes (Charales, Charophyceae) on the north-eastern edge of Europe: is it something different across Northern Europe in their diversity and biogeography?

2018 ◽  
Vol 147 ◽  
pp. 161-182 ◽  
Author(s):  
Roman E. Romanov ◽  
Elena N. Patova ◽  
Boris Yu. Teteryuk ◽  
Elena V. Chemeris
Keyword(s):  
Northern Europe ◽  
The North ◽  
North Eastern ◽  
Eastern Edge

Inversion tectonics during post-orogenic extensional collapse: a comparison between ancient (North Sea, UK) and recent (Fucino Basin, central Apennines Apennines) intermontane systems

2020 ◽  
Author(s):  
Stefano Patruno ◽  
Vittorio Scisciani
Keyword(s):  
Gravitational Collapse ◽  
Western Europe ◽  
Central Italy ◽  
Middle Pleistocene ◽  
Coupled Analysis ◽  
Inversion Tectonics ◽  
Central Apennines ◽  
The North ◽  
Fucino Basin ◽  
Extensional Collapse

<p>Post-orogenetic extensional/gravitational collapse events constitute a relatively poorly understood tectonic process, which is responsible for the quick and effective dismantling of the thickened crust and topographic bulge of fold-and-thrust belt edifices. These events are also responsible for the accumulation of very thick post-orogenetic successions and, in case of active extension, may trigger moderate to strong earthquakes resulting in obvious seismic hazards (e.g., the 1915 Mg 7.0 Fucino earthquake in Central Italy, which caused 30,000 victims)</p><p>Here, we combine seismic interpretation coupled with well analyses, basin modelling and a thorough literature review, in order to compare an ancient and a modern example of study areas subject to post-orogenetic collapse. The Devonian-age Old Red Sandstones of north-western Europe and ?Plio-Quaternary fill of the Fucino intramontane extensional basin in the central Apennines (Italy) share several stratigraphic, depositional and tectonic characteristics. Both are characterized by remarkably similar seismic-stratigraphic architecture (with syn-depositional half-grabens) and maximum thickness of >1,500 metres. In the Fucino, the border faults associated to the main tectonic depocentres achieved maximum throw rates of 1,000-1,400 mm/kyr.</p><p>Both units comprise thick continental siliciclastic successions, dominated by lacustrine and alluvial to fluvio-deltaic facies. The facies architecture reveals a progressive transition from localized, fault-bounded depocentres to transgressive lacustrine successions in wider basins that are less reliant on the sole fault-driven subsidence. The studied units were deposited due to high and quick tectonic subsidence which took place very shortly after the end (or during?) of crustal shortening processes (respectively Caledonian and Apenninic orogenesis) and in a post-orogenic collapse context.</p><p>In both study areas, the sedimentation of the thick continental units are intimately associated to a polyphase inversion tectonics, with pre-existing inherited deep-seated discontinuities affected, in places, first by a positive and subsequently by a negative reactivation during the extensional collapse. A further element common in the two study areas, is a strike-slip or oblique tectonics occurring during or immediately prior to the extensional collapse achieved by the normal faulting. This has been interpreted as a consequence of the gradual rotation of the stress vectors around their axes, culminating in the relaxation of the horizontal compressive stress and the onset of the post-orogenetic extensional/gravitational collapse process itself. For example, in the Fucino Basin, maximum Plio-Quaternary sediment thicknesses of >1700 m occur in two tectonic depocentres, situated respectively to the north and east of the basin. In contrast, the south-eastern striking dip-slip border faults bounding the eastern edge of the Fucino show maximum slip rates in the Lower-Middle Pleistocene, with evidence (e.g., Gioia dei Marsi) for a very recent activity, possibly linked with the 1915 seismic event.</p><p>The study of post-orogenic extensional collapse by comparison of ancient and recent basins suggest that in these settings poly-phase tectonic inversion commonly occurs and promote multiple reactivation of inherited zones of weakness. The comprehension of the common and dissimilar features, may be fundamental to better understand the mechanism and evolution of post-orogenic chain reworking and for natural resources and geological hazards assessment, including earthquakes. The coupled analysis of an ancient and recent example enables just that.</p>

scholarly journals The Belgian Limburg dialect of Hamont

2007 ◽  
Vol 37 (2) ◽  
pp. 219-225 ◽  
Author(s):  
Jo Verhoeven
Keyword(s):  
The Netherlands ◽  
Small Town ◽  
Lexical Tone ◽  
The West ◽  
Unique Position ◽  
The North ◽  
North Eastern ◽  
National Border ◽  
The Town ◽  
Eastern Edge

Hamont is a small town located on the north-eastern edge of the Belgian province of Limburg, on the national border with the Netherlands. It is situated about 30 km south of Eindhoven and 15 km west of Weert in the Netherlands. The town has about 13,500 inhabitants. According to Belemans, Kruijsen & Van Keymeulen (1998), the dialect of Hamont belongs to the West Limburg dialects (subclassification: Dommellands). Limburg dialects occupy a unique position among the Belgian and Dutch dialects in that their prosodic system has a lexical tone distinction, which is traditionally referred to as SLEEPTOON ‘dragging tone’ and STOOTTOON ‘push tone’. In line with recent conventions, stoottoon is referred to as Accent 1 and transcribed as superscript 1; sleeptoon is referred to as Accent 2 and is transcribed as superscript 2 (cf. Schmidt 1986).

Changes in the Marriage System of the Okrika Ijo

Africa ◽  
1962 ◽  
Vol 32 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Kay Williamson
Keyword(s):  
Niger Delta ◽  
Eastern Region ◽  
Social Changes ◽  
Marriage And Family ◽  
Family Organization ◽  
Eastern Group ◽  
The North ◽  
North Eastern ◽  
Opening Paragraph ◽  
Eastern Edge

Opening ParagraphIn this paper I shall present some data on the marriage and family organization of an Eastern Ijo town, and shall try to analyse changes in this organization against the background of broader social changes affecting the area.Okrika is the chief town of the Okrika section of the Ijo-speaking people of Nigeria. The Okrika dialect, with Kalahari and Bonny, falls into the North-Eastern group of dialects which are partially interintelligible with Brass-Nembe but not with the Central-Western dialects. The Ijo occupy the greater part of the Niger Delta. The Okrika section consists of eight towns and dependent villages on the extreme eastern edge of the Delta, where the saltwater creeks and mangrove swamps give place to the extensive dry ground of the mainland. Administratively, Okrika forms part of the Degema Province of the Eastern Region of Nigeria. With three other communities of the section, Okrika itself is sited on an island about half a mile long and a quarter broad.

scholarly journals Interpretation of geochemical researches of oil and formation water of one particular oil field (Republic of Kazakhstan)

2020 ◽  
Vol 15 (3) ◽  
Author(s):  
E.Sh. Seytkhaziev ◽  
◽  
N.D. Sarsenbekov ◽  
Keyword(s):  
Ionic Composition ◽  
Oil Field ◽  
Formation Water ◽  
High Concentration ◽  
Injection Wells ◽  
The North ◽  
North Eastern ◽  
Water Cut ◽  
Eastern Edge ◽  
North Eastern Part

46 oil samples were collected at the wellheads of different wells of a particular oil field and “oil fingerprinting” was performed by gas chromatographic analysis on LTM-MD-GC in order to understand the fluid connectivity of the reservoir within the field. This field located in the eastern edge of the Caspian Basin. According to the results of cluster analyzes, it was found that the studied samples of the north-eastern part of the oil field differ from those of the south-western part. Since the oil field has a massive reservoir height, all wells operate with minimum water-cut values, except for the production well. In this regard, the ionic composition of the water and the titration method were used to analyze the ionic composition of water, separated from the oil of producing well, two neighboring injection wells and block cluster pumping station of this field, to determine the ionic composition and identify differences and similarities of waters at the molecular level. According to the results of the analyzes, we came to the conclusion that all the studied formation water samples have common origin. The relatively high NaCl value in producing well water may be due to the high concentration of chloride in the oil.

Tephrostratigraphy and tephrochronology of a 430 ka sediment record from the Fucino Basin, central Italy

2020 ◽  
Author(s):  
Niklas Leicher ◽  
Biagio Giaccio ◽  
Bernd Wagner ◽  
Giorgio Mannella ◽  
Lorenzo Monaco ◽  
...  
Keyword(s):  
Environmental History ◽  
Central Italy ◽  
Lacustrine Sediments ◽  
Global Scale ◽  
Early Pleistocene ◽  
Central Mediterranean ◽  
The North ◽  
Tephra Layers ◽  
Spatio Temporal ◽  
Fucino Basin

<p>The Fucino Basin is the largest and probably the only Central Apennine basin hosting a thick, continuous lacustrine sediment succession documenting the environmental history from the Early Pleistocene to recent historical times. The basin is located downwind of the Italian volcanic districts (< 150 km), which makes it the best candidate available in the central Mediterranean to construct a long and continuous tephrostratigraphic and tephrochronological record. Tephrostratigraphic investigations conducted on a first core (F1-F3) revealed 21 tephra layers of different Italian volcaoes. Among them several widespread and well-dated key Mediterranean marker tephra layers (e.g., Neapolitan Yellow Tuff, Y-1, Campanian Ignimbrite, Y-7, X-5, X-6, and Taurano Ignimbrite) were recognized and allowed to date, together with <sup>40</sup>Ar/<sup>39</sup>Ar ages directly obtained from the Fucino tephra layers, the record back to 190 ka.</p><p>Based on these promising results, a new drilling site with a lower sedimentation rate was targeted, bringing forth the ~98 m long F4-F5 record. In addition to the already recognised tephra layers occurring in the section that overlaps with core F1-F3, ~110 additional tephra and cryptotephra horizons were identified in the composite sediment succession of the F4-F5 record, providing new insights into the Italian volcanic history for the poorly explored interval beyond 200 ka.</p><p>Here we present the first tephrostratigraphic and tephrochronological results for this interval, which is dominated by eruptions from the Sabatini, Vulsini, Vico, and Colli Albani volcanoes. Several important known eruptions were identified and dated for the first time in distal settings: e.g., Canino (256.8 ± 1.1 ka), Tufo Giallo di Sacrofano (288.0 ± 2.0 ka), Magliano Romano Plinian Fall (315.0 ± 2.0 ka), Orvieto-Bagnoregio Ignimbrite (335.8 ± 1.4 ka), Villa Senni (367.5 ± 1.6 ka), Pozzolane Nere and its precursor (408.5 ± 1.3 ka, and 407.1 ± 4.2 ka, respectively). Finally, a tephra located at the base of the succession was directly dated by <sup>40</sup>Ar/<sup>39</sup>Ar at 424.3 ± 3.2 ka, thus extending the record back to the MIS 12/11 transition (~430 ka).</p><p>Ongoing geochemical analysis, including trace elements, Sr and Nd isotopes, and <sup>40</sup>Ar/<sup>39</sup>Ar dating of both Fucino tephra layers and potential proximal counterparts will help to reveal their volcanic sources and enable further tephrostratigraphic correlations supported by independent age determinations. These results will contribute towards an improved MIS 11-MIS 7 Mediterranean tephrostratigraphy, which is still poorly characterized and exploited.</p><p>The recognition and dating of the numerous tephra layers from the F4-F5 record can be directly combined to construct a comprehensive age-depth series of biogeochemical proxies and geomagnetic excursions derived from the lacustrine sediments, forming the backbone for an independent, radioisotopically anchored chronology for the F4-F5 multi-proxy record. Through paleoclimatic alignments and geomagnetic excursion synchronizations, the independent Fucino chronology can be propagated to the North Atlantic records, and possibly on a global scale, setting the framework for a better understanding of the spatio-temporal variability, magnitude, and different expressions of Quaternary orbital and millennial-scale paleoclimatic changes.</p>

Dynamics and growth of a bivalve, Abra tenuis, at the northern edge of its distribution

1993 ◽  
Vol 73 (3) ◽  
pp. 497-511 ◽  
Author(s):  
R. Dekker ◽  
J. J. Beukema
Keyword(s):  
Wadden Sea ◽  
Maximum Size ◽  
High Water ◽  
The North ◽  
Level Data ◽  
Water Level Data ◽  
North Eastern ◽  
Northern Edge ◽  
Cold Spring ◽  
Eastern Edge

The small bivalve Abra tennis (Montagu) (Bivalvia: Semelidae) reaches the north-eastern edge of its range in the Wadden Sea near the Dutch/German border. In the Wadden Sea it is restricted to a narrow intertidal zone close to the high-water level. Data are reported from a population at Balgzand, in the south-westernmost part of the Wadden Sea, which has been monitored for two decades. This population showed a strongly fluctuating density and was seemingly absent for more than three years following three severe winters in succession. Over-winter survival in adults was greater during mild than cold winters, and close to zero during all winters that were colder than average. Recruitment was higher in warm than in cold summers. Growth was more rapid in warm than in cold spring-summer periods. In warm years growth rates were higher than in more southern locations, and values for maximum size and life span were relatively high.

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