On the tectonic evolution of the Ligurian accretionary complex in southern Italy

2011 ◽  
Vol 124 (3-4) ◽  
pp. 463-483 ◽  
Author(s):  
S. Ciarcia ◽  
S. Mazzoli ◽  
S. Vitale ◽  
M. Zattin
Keyword(s):  
Tectonic Evolution ◽  
Southern Italy ◽  
Accretionary Complex

Vorticity analysis of the Palmi shear zone mylonites: new insights for the Alpine tectonic evolution of the Calabria-Peloritani terrane (southern Italy)

2015 ◽  
Vol 51 (4) ◽  
pp. 670-681 ◽  
Author(s):  
Vincenzo Festa ◽  
Giacomo Prosser ◽  
Alfredo Caggianelli ◽  
Antonietta Grande ◽  
Antonio Langone ◽  
...  
Keyword(s):  
Shear Zone ◽  
Tectonic Evolution ◽  
Southern Italy ◽  
Vorticity Analysis

Structure and tectonic evolution of the Late Jurassic–Early Cretaceous Wandashan accretionary complex, NE China

2018 ◽  
Vol 61 (1) ◽  
pp. 17-38 ◽  
Author(s):  
Han Zheng ◽  
Xiaomeng Sun ◽  
Kuo Wan ◽  
Pujun Wang ◽  
Song He ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Tectonic Evolution ◽  
Late Jurassic ◽  
Accretionary Complex ◽  
Ne China

scholarly journals U-Pb ZIRCON DATING OF MIDDLE EOCENE CLASTIC ROCKS FROM THE GERCUS MOLASSE, NE IRAQ: NEW CONSTRAINTS ON THEIR PROVENANCE, AND TECTONIC EVOLUTION

2021 ◽  
Vol 54 (1C) ◽  
pp. 1-15
Author(s):  
Nabaz Aziz
Keyword(s):  
Tectonic Evolution ◽  
Middle Eocene ◽  
Early Stage ◽  
Foreland Basin ◽  
Detrital Zircons ◽  
Passive Margin ◽  
Accretionary Complex ◽  
Depositional Sequence ◽  
Clastic Rocks ◽  
The North

The provenance of Middle Eocene clastic rock from the Gercus Molasse, NE Iraq was determined by detrital zircon (DZ) U-Pb geochronology. The Gercus Molasse in the Iraqi segment of the north-eastern Zagros Thrust Zone provides an ideal example of foreland system evolution with respect to the transition from passive margin to the accretionary complex terrene-flexural foreland basins. The DZ U-Pb age spectra from the Gercus Molasse suggest that the foreland sediments either influx from multiple provenances or are the result of recycling from the accretionary complex terrane. During pre-accretion, however, the radiolarite basin (Qulqula Radiolarite, 221 Ma) located along Arabian passive margin likely acted as an intermediate sediment repository for most or all of the DZ. Representative DZ U-Pb measurements revealed that the Gercus clastic rocks fall into several separable age population ranges of 92-102 (Albian-Cenomanian), 221 (Upper Triassic), 395-511 (Cambrian), 570- 645 (Neoproterozoic), 1111 (Mesoproterozoic), and lesser numbers of Paleoproterozoic (1622-1991 Ma) ages. The source of Proterozoic detrital Zircons is enigmatic; the age peaks at 1.1, 1.5, 1.6, and 1.9 Ga (Proterozoic) does not correspond to any known outcrops of Precambrian rocks in Iraq, and it may be useful to continue to search for such basement. The detrital zircons with age populations at 0.63–0.86 Ga probably originated from the Arabian-Nubian Shield. The age peak at 0.55 Ga correlates with Cadomian Magmatism reported from north Gondwana. The age peaks at ~0.4 Ga is interpreted to represent Gondwana rifting and the opening of Paleotethys. The youngest ages populations at 93 Ma indicate that fraction of DZ were transported directly from the contemporaneously active magmatic arc (Zagros Ophiolite segments). The paleogeography and tectonic evolution of the Neogene Zagros foreland basin were reconstructed and divided into two tectonic stages. The early stage is defined by the Campanian accreted terranes (i.e. orogenic wedge) form loads sufficient to produce flexural basin with a deepest part is situated next to the tip of the loads. This flexural basin is filled by the flysch clastics of the Maastrichtian– Early Eocene (i.e. referred to by the Tanjero-Kolosh flysch sequence). The late stage is marked by a synchronized modification of the clastics fill of the basin and changes in dip directions to compensate for the reduction of the load by both erosion and extension and the basin, therefore, was sealed by a shallowing upwards depositional sequence ending with the terrestrial Gercus Formation.

scholarly journals GEOLÓGIA A TEKTONIKA STYČNEJ OBLASTI CENTRÁLNYCH A EXTERNÝCH KARPÁT NA ZÁPADNOM SLOVENSKU – PREHĽAD NOVÝCH VÝSLEDKOV A KONCEPCIÍ

2016 ◽  
Vol 22 (1-2) ◽  
Author(s):  
Dušan Plašienka
Keyword(s):  
Tectonic Evolution ◽  
Lower Plate ◽  
Accretionary Wedge ◽  
Accretionary Complex ◽  
The South ◽  
Sedimentary Record ◽  
Clastic Sediments ◽  
Orogenic Wedge ◽  
Pieniny Klippen Belt

New data gathered in the Pieniny Klippen Belt (PKB) and adjacent zones along the Central–External Carpathians boundary in western Slovakia allow for a formulation of an updated model of its structure and tectonic evolution. In general, these zones evolved as an accretionary complex in front of the prograding Central Western Carpathian orogenic wedge during the latest Cretaceous to Paleogene. Step-by-step forward accretion of Oravic units of the PKB (Šariš, Subpieniny, Pieniny) with piggyback frontal elements of the Fatric units (Drietoma, Manín, Klape) was followed by incorporation of the External Carpathian Biele Karpaty and Magura units and brought about transfer of the Oravic elements from the wedge tip to its rear. The wedge growth was accompanied by steepening of the PKB structures up to final overturning and backthrusting to the south in places. By this process, the PKB were ultimately placed in the centre or southern limb of an asymmetric fan-wise accretionary wedge, i.e. in a backstop position between the wedge and rigid Central Carpathian block. Consequently, the original fold-and-thrust structures of the PKB were modifi ed or largely obliterated by superimposed out-of-sequence thrusting, transpressional and transtensional deformation. In addition to a rather poor brittle structural record that is mostly related to younger post-thrusting deformation, these processes are nicely registered by synorogenic clastic sediments in both the trench-foredeep basins in the lower plate of the convergent system (Oravic units) and in the piggyback, wedge-top basins above the deformed wedge (Gosau-type basins). Sedimentary record in the wedge-top area is diff erentiated into several transgression/regression cycles that are interpreted in terms of the critical wedge theory.

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