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1.
Mirdita Zone ophiolites and associated sediments in Albania reveal Neotethys Ocean origin 总被引:1,自引:1,他引:0
Hans-Jürgen Gawlick Wolfgang Frisch Lirim Hoxha Paulian Dumitrica Leopold Krystyn Richard Lein Sigrid Missoni Felix Schlagintweit 《International Journal of Earth Sciences》2008,97(4):865-881
The Mirdita Ophiolite Zone in Albania is associated with widespread mélanges containing components of up to nappe-size. We
dated matrix and components of the mélange by radiolarians, conodonts, and other taxa. The components consist of radiolarites,
pelagic limestones and shallow-water limestones, all of Triassic age, as well as ophiolites. Triassic radiolarite as a primary
cover of ophiolite material proves Middle Triassic onset of Mirdita ocean-floor formation. The mélange contains a turbiditic
radiolarite-rich matrix (“radiolaritic flysch”), dated as Late Bajocian to Early Oxfordian. It formed as a synorogenic sediment
during west-directed thrusting of ophiolite and sediment-cover nappes representing ocean floor and underplated fragments of
the western continental margin. The tectonic structures formed during these orogenic events (“Younger Kimmeridian or Eohellenic
Orogeny”) are sealed by Late Jurassic platform carbonates. The geological history conforms with that of the Inner Dinarides
and adjoining areas; we therefore correlate the Mirdita-Pindos Ophiolite Zone with the Vardar Zone and explain its present
position by far-distance west-directed thrusting. 相似文献
2.
Filiz Bilgili Hans-Jürgen Götze Roman Pašteka Sabine Schmidt Ron Hackney 《International Journal of Earth Sciences》2009,98(3):571-583
An unsolved problem of regional importance for both the evolution and structure of the Northwest German Basin is the existence
or non-existence of the so-called Bramsche Massif. Explaining the nature of this massif and the cause of a related strong,
positive Bouguer anomaly (Bramsche Anomaly) is critical. In the study described here, we tested an existing “intrusion model”
against a newer “inversion model” in the southern Northwest German Basin. In the intrusion model, the strongly-positive Bouguer
anomaly represents the gravity effect of an intrusion at depths between 6 and 10 km. More recent interpretations invoke tectonic
inversion rather than intrusion to explain increased burial and the low level of hydrocarbon maturity found in boreholes.
We tested these different interpretations by constructing 3D forward density models to 15 km depth. The intrusion model was
updated and adjusted to incorporate recent data and we also modelled pre-Zechstein structures using different scenarios. The
final model has a very good fit between measured and modelled gravity fields. Based on currently available seismic and structural
models, as well as borehole density measurements, we show that the positive Bouguer anomaly cannot be modeled without a high-density,
intrusive-like body at depth. However, further in-sight into the crustal structures of the Bramsche region requires more detailed
investigations.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
3.
Zusammenfassung Es werden Ergebnisse von simultanen Seegangsmessungen an sieben Pl?tzen mit verschiedener Wassertiefe im Küstengebiet der
Deutschen Bucht behandelt. An Hand einiger Gegenüberstellungen wird dargelegt, in welcher Weise die Windsee mit abnehmender
Wassertiefe niedriger und kürzer wird.
Simultaneous measurements of waves by means of non-stabilized recording accelerometers at various places in the German Bight with different water depths
Summary Treated are the results of simultaneous measurements of waves at seven places in the coastal area of the German Bight with different water depths. A comparison demonstrates the way in which the wind sea is getting lower and shorter with decreasing water depth.
Mesures simultanées de l'agitation de la mer avec accéléromètres enregistreurs non stabilisés en points de profondeurs différentes de la Baie Allemande
Résumé On a traité les résultats obtenus de mesures simultanées de l'agitation de la mer en sept endroits de profondeurs différentes dans les eaux c?tières de la Baie Allemande. En utilisant quelques comparaisons on expose de quelle manière la mer due au vent diminue de hauteur et de longueur en même temps que la profondeur.相似文献
4.
Uwe?LangrockEmail author Ruediger?Stein Marcus?Lipinski Hans-Jürgen?Brumsack 《Geo-Marine Letters》2003,23(1):34-42
The late Volgian (early "Boreal" Berriasian) sapropels of the Hekkingen Formation of the central Barents Sea show total organic carbon (TOC) contents from 3 to 36 wt%. The relationship between TOC content and sedimentation rate (SR), and the high Mo/Al ratios indicate deposition under oxygen-free bottom-water conditions, and suggest that preservation under anoxic conditions has largely contributed to the high accumulation of organic carbon. Hydrogen index values obtained from Rock-Eval pyrolysis are exceptionally high, and the organic matter is characterized by well-preserved type II kerogen. However, the occurrence of spores, freshwater algae, coal fragments, and charred land-plant remains strongly suggests proximity to land. Short-term oscillations, probably reflecting Milankovitch-type cyclicity, are superimposed on the long-term trend of constantly changing depositional conditions during most of the late Volgian. Progressively smaller amounts of terrestrial organic matter and larger amounts of marine organic matter upwards in the core section may have been caused by a continuous sea-level rise. 相似文献
5.
6.
Luis O'Dogherty Agustín Martín-Algarra Hans-Jürgen Gursky Roque Aguado 《International Journal of Earth Sciences》2001,90(4):831-846
Middle Jurassic radiolarites and associated pelagic limestones occur in the Rondaide Nieves unit of the Betic Cordillera, southern Spain. The Rondaide Mesozoic includes: (a) a thick succession of Triassic platform carbonates, comparable to the Alpine Hauptdolomit and Kössen facies; (b) Lower Jurassic pelagic limestones comparable to the Alpine Hierlatz and Adnet facies; (c) the Middle Jurassic Parauta Radiolarite Formation, described herein; and (d) a thin Upper Jurassic-Cretaceous condensed limestone succession. The Parauta Radiolarite Formation and associated limestones were studied with respect to stratigraphy, petrography, micropalaeontology (radiolarians, calcareous nanno- and microfossils) and facies. Radiolarite sedimentation occurred in the Middle Bathonian in a restricted and dysoxic deep Nieves basin, perched in the distal zone of a continental margin fringing the Tethyan ocean. This margin was adjacent to a young narrow oceanic basin between the South-Iberian margin and a continental block called Mesomediterranean Terrane. The Nieves basin was part of a marine corridor between the Proto-Atlantic and Piedmont-Ligurian basins of the Alpine Tethys. The regional tectonic position, the stratigraphical evolution since the Triassic, the age and the nature of the Mesozoic facies and the palaeogeographic relations to adjacent domains show striking analogies between the Betic Rondaide margin and coeval units of the Alps. 相似文献
7.
In North-West Europe no evidence has been found for glaciations older than the Elsterian. The Elsterian seems to consist of at least two separate ice advances with a minor interval in between. During the Elsterian in the area south of the Baltic Sea over 400 m deep channels were cut into the underlying substratum by a combination of glacial erosion and meltwater activity. The channels were active until the Late Elsterian and were subsequently filled with meltwater deposits and glaciolacustrine silt and clay. During the Saalian no comparative channels were being formed. Three different ice advances can be distinguished within the Saalian, the stratigraphical correlation of which is to be discussed. No convincing evidence was found for any interglacial within the Saalian sequence. There are good reasons to assume that the ice advances were only separated from each other by minor ice-free intervals. 相似文献
8.
Taniel Danelian Laurence Le Callonnec Jochen Erbacher David C. Mosher Mitchell J. Malone Debora Berti Karen L. Bice Helen Bostock Hans-Jürgen Brumsack Astrid Forster Felix Heidersdorf Jorijntje Henderiks Thomas J. Janecek Christopher Junium Ken MacLeod Philip A. Meyers Jörg H. Mutterlose Hiroshi Nishi Christine Glatz 《Comptes Rendus Geoscience》2005,337(6):609-616
Five sites located on a bathymetric transect of the distal Demerara Rise were studied by ODP Leg 207. Albian sediments of essentially terrigenous nature (clay, siltstone, sandstone) are the oldest drilled stratigraphic levels and form apparently the top of the synrift sequence. They are overlain by Cenomanian to Santonian finely laminated black shales, rich in organic matter of marine origin, which accumulated on a thermally subsiding ramp. Early Campanian hiatuses are thought to be the result of final disjunction of Demerara Rise (South America) from Africa and the onset of deep water communication between the two Atlantic basins (south and central). The overlying Uppermost Cretaceous–Oligocene chalk includes rich and diversified calcareous plankton assemblages, as well as two radiolarian-rich intervals (Late Campanian and Middle Eocene). A complex erosional surface developed during the Late Oligocene–Early Miocene. Sedimentation was impeded since then on the intermediate and deep sites of Demerara Rise, possibly due to the action of deep submarine currents. To cite this article: T. Danelian et al., C. R. Geoscience 337 (2005). 相似文献
9.
Javier Sanchez Hans-Jürgen Götze Michael Schmitz 《International Journal of Earth Sciences》2011,100(7):1697-1712
A 3-D structural model of the Caribbean-South American plate boundary was constructed by gravity modeling. The model was constrained
by four wide-angle seismic refraction sections, Moho depth estimations from receiver functions, and additionally seismological
hypocenters, surface geology, and geodynamic information. Density values were calculated from empirical velocity-density functions,
and mineralogical-chemical composition considering specific P/T conditions. We tested different structural models for Western
and Eastern Venezuela. In the final model, the fit of the measured and modeled gravity fields for a long Caribbean slab in
Western Venezuela was better than the fit obtained for a short one. This interpretation is consistent with the constraining
data. The slab is interpreted to extend further to the south beneath Northern Colombia and culminates in the area of the seismic
cluster of the Bucaramanga nest. The modeling estimates a slab dip angle under Maracaibo and Mérida Andes of 15°, which increases
to 32° below 100 km depth. The dip direction of approx. N150°E ± 5 increases lightly eastward. In Eastern Venezuela, considering
its short wavelength, lineaments analyzed from gravity data (by curvature methods and Euler deconvolution) seem to be related
to shallow structures and density contrast in the Serranía del Interior and not from a deep detached slab beneath the continental
crust. It is deduced from modeling results that this slab configuration has a very small influence on the gravity field. The
slab was modeled according to the subduction-transform propagation model with purely westward subduction and a slab break
off along a vertical dip-slip tear through the lithosphere. 相似文献
10.
Alexander?W.?MiddletonEmail author I.?Tongu??Uysal Suzanne?D.?Golding Hans-Jürgen?F?rster Charlotte?M.?Allen Yeuxing?Feng Dieter?Rhede Vicki?J.?Marshall Jaco?van?Zyl 《Contributions to Mineralogy and Petrology》2014,168(3):1058
The Warburton Basin of central Australia has experienced a complex tectonic and fluid-flow history, resulting in the formation of various authigenic minerals. Geochemical and geochronological analyses were undertaken on vein carbonates from core samples of clastic sediments. Results were then integrated with zircon U–Pb dating and uraninite U–Th–total Pb dating from the underlying granite. Stable and radiogenic isotopes (δ18O, Sr and εNd), as well as trace element data of carbonate veins indicate that >200 °C basinal fluids of evolved meteoric origin circulated through the Warburton Basin. Almost coincidental ages of these carbonates (Sm–Nd; 432 ± 12 Ma) with primary zircon (421 ± 3.8 Ma) and uraninite (407 ± 16 Ma) ages from the granitic intrusion point towards a substantial period of active tectonism and an elevated thermal regime during the mid Silurian. We hypothesise that such a thermal regime may have resulted from extensional tectonism and concomitant magmatic activity following regional orogenesis. This study shows that the combined application of geochemical and geochronological analyses of both primary and secondary species may constrain the timing of tectonomagmatic events and associated fluid flow in intraplate sedimentary basins. Furthermore, this work suggests that the Sm–Nd-isotopic system is surprisingly robust and can record geologically meaningful age data from hydrothermal mineral species. 相似文献