Early Cretaceous tectonic event in the Adria: Insight from Umbria-Marche pelagic basin (Italy)

2016 ◽  
pp. 35-55 ◽  
Author(s):  
Marco Menichetti
Keyword(s):  
Early Cretaceous ◽  
Tectonic Event

scholarly journals The Tectonic event of the Zaire-Hala’alate thrust belt in Junggar Basin,China

2021 ◽  
Vol 937 (4) ◽  
pp. 042090
Author(s):  
Jinghui Ma ◽  
Lishang Nie ◽  
Changcheng Han
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
Thermal History ◽  
Fission Track ◽  
Junggar Basin ◽  
Tectonic Activity ◽  
Thrust Belt ◽  
Tectonic Event ◽  
Intensity Effect ◽  
Activity Intensity

Abstract The Yanshanian tectonic activity intensity effect of The Zaire- Hala’alate thrust belt, which is located in the northwest margin of Junggar Basin, have been in dispute for a long time. The distribution characteristics of the FT peak age in the narrower time domain is the key to understanding the dynamic mechanism of this important intracontinental deformation. In this study, apatite fission track dating and thermal history simulation analysis were carried out on 6 samples collected from this area. The results show that the fission track ages are mainly distributed in three intervals, corresponding to the geological ages of 130∼128Ma, 92∼89Ma and 72Ma, reflecting the obvious cooling and uplifting events in the three periods. At the same time, the thermal history simulation shows that the region experienced three rapid uplift events in the Early Cretaceous, the Early Late Cretaceous and the Late Cretaceous-Eocene. The comprehensive study shows that the main thrust fold in this area started from the end of Early Cretaceous, and the tectonic movement was the most intense in Late Cretaceous. As a whole, Tectonic activity migrated from south to north, which shows a retro-thrust expansion from the basin to the orogenic belt.

scholarly journals ?Kimmeridgian-Tithonian shallow- water platform clasts from mass flows on top of the Vardar/Axios ophiolites

2016 ◽  
Vol 47 (1) ◽  
pp. 184
Author(s):  
G. Kostaki ◽  
A. Kilias ◽  
H. J. Gawlick ◽  
F. Schlagintweit
Keyword(s):  
Early Cretaceous ◽  
Late Jurassic ◽  
Eastern Alps ◽  
Sediment Supply ◽  
Carbonate Platforms ◽  
Northern Greece ◽  
Tectonic Event ◽  
Mass Flows ◽  
Sedimentary Succession ◽  
Ophiolite Emplacement

The Late Jurassic to Early Cretaceous sedimentary succession of the Neochorouda Unit lies unconformably on top of the Oreokastro ophiolites of the Vardar/Axios “suture zone” in northern Greece. This succession consists of turbidites and mass flows and provides an upper limit for ophiolite emplacement. New biostratigraphic and microfacies analysis from the clasts in the mass flows were carried out for a better understanding of the Late Jurassic to Early Cretaceous geodynamic history. Microfacies and organism content prove the onset of Late Jurassic carbonate platforms on top of a Middle to Late Jurassic nappe stack striking from the Eastern Alps to the Hellenides. Middle to Late Jurassic nappe stacking towards WNW to NW followed late Early to Middle Jurassic intra-oceanic thrusting in the Western Vardar/Axios (= Neotethys) Ocean and subsequent ophiolite obduction onto the Pelagonian Units forming a thin-skinned orogen on the lower plate. After ophiolite emplacement Kimmeridgian- Tithonian carbonate platforms sealed widespread this tectonic event. Tithonian extension due to mountain uplift resulted in partial erosion of these platforms and new extensional basins were formed. Late Tithonian to earliest Cretaceous erosion of the uplifted nappe stack including the obducted ophiolites resulted in sediment supply into the newly formed basins also east of the Pelagonian Units.

scholarly journals Middle Jurassic – Early Cretaceous rifting of the Danish Central Graben

2003 ◽  
Vol 1 ◽  
pp. 247-264 ◽  
Author(s):  
Jens J. Møller ◽  
Erik S. Rasmussen
Keyword(s):  
Early Cretaceous ◽  
Middle Jurassic ◽  
Upper Jurassic ◽  
Sea Level Changes ◽  
Tectonic Event ◽  
Boundary Fault ◽  
The Third ◽  
Structural Framework ◽  
Reservoir Sandstones ◽  
Sandstone Formation

During the Jurassic – Early Cretaceous, the Danish Central Graben developed as a N–S- to NNW– SSE-trending graben bounded by the Ringkøbing–Fyn High towards the east and the Mid North Sea High towards the west. The graben consists of a system of half-grabens and evolved by faultcontrolled subsidence; three main rift pulses have been recognised. The first pulse ranged from the Callovian to the Early Oxfordian, the second pulse was initiated in the latest Late Kimmeridgian and lasted for most of the Early Volgian, and the third and final pulse occurred within the Ryazanian in the Early Cretaceous. The first pulse was characterised by subsidence along N–S-trending faults. The most pronounced fault-controlled subsidence occurred in the east, especially along N–S-striking segments of the boundary fault to the Ringkøbing–Fyn High. During this period, minor salt movements occurred with the development of salt pillows. The activity along the N–S-trending faults ceased during the Oxfordian. During the second pulse, in Early Volgian times, subsidence was concentrated along new NNW–SSE-trending faults and the main depocentre shifted westward, being most marked within the Tail End Graben, the Arne–Elin Graben, and the Feda Graben. This tectonic event was accompanied by the accumulation of a relatively thick sediment load resulting in the development of salt diapirs, especially within the Salt Dome Province. The third tectonic pulse was essentially a reactivation of the NNW–SSE-trending structures and there is clear evidence of subsidence controlled by faulting and salt movements. Despite the overall extensional tectonic regime, local compressional tectonics resulted in thrusting. For instance, the Gert Ridge is interpreted to have formed by readjustment at the boundary fault between two subsiding blocks. The structural framework during graben evolution controlled, to some degree, the distribution of reservoir sandstones. Reservoir sandstones associated with periods of rotational tilt include Middle Jurassic deposits referred to the Bryne and Lulu Formations, and Upper Jurassic sandstones referred informally to the ‘Fife Sandstone Formation’. Sands deposited during tectonic relaxation are represented by the Heno Formation and Upper Jurassic turbidites interbedded in the Farsund Formation. Sea-level changes were probably most important during periods of tectonic relaxation, particularly with respect to the deposition of lowstand sandstones in basinal areas.

Geochronology and structural setting of Latest Devonian – Early Carboniferous magmatic rocks, Cape Kiber, northeast Russia

2015 ◽  
Vol 52 (3) ◽  
pp. 147-160 ◽  
Author(s):  
Larry S. Lane ◽  
Michael P. Cecile ◽  
George E. Gehrels ◽  
Mikhail K. Kos’ko ◽  
Paul W. Layer ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Early Carboniferous ◽  
Major And Trace Elements ◽  
The Arctic ◽  
Late Devonian ◽  
Northeast Russia ◽  
Tectonic Event ◽  
Magmatic Rocks ◽  
Arctic Alaska ◽  
North Asia

Cape Kiber on the Arctic coast of Chukotka, northeast Russia, consists of a granite intruding Devonian (and older?) strata in the core of a large southeast trending anticline. These strata are structurally overlain by Carboniferous and younger strata. A U–Pb age of 351.4 ± 5.6 (2σ) Ma shows that the granite is Early Carboniferous in age. A large granite cobble extracted from a Carboniferous conglomerate produced a Late Devonian or Early Carboniferous U–Pb age of ∼355–361 Ma. Also, a deformed and altered granitic dyke yielded an age of 363.7 ± 5.7 (2σ) Ma. Major and trace elements suggest a syn-collisional (orogenic) setting. The granite’s (biotite) Ar release spectrum is reset. The granitic dyke also shows a disturbed Ar–Ar whole-rock spectrum implying an Early Cretaceous age (∼122–130 Ma) for closure of the Ar system. We interpret this as due to widespread greenschist metamorphism accompanying regional deformation of the Anyuy–Chukotka Fold Belt that accompanied closure of the South Anyuy Ocean. Regionally, this event predates deposition of Aptian and Albian strata and the eruption of Okhotsk–Chukotsk magmatic rocks. An Ar–Ar (biotite) plateau age of 96.4 ± 1.0 (2σ) Ma from a mildly deformed, lamprophyre dyke reflects intrusion in a setting of regional extension. Its deformation reflects a younger tectonic event. The record of Devonian–Carboniferous magmatism and early Carboniferous unroofing is younger and less complex than that of Arctic Alaska. However, evidence for Early Devonian (Caledonian) or Late Devonian (Ellesmerian) deformation could have been masked by intense Mesozoic deformation. Outcrop data and geochronology support and refine regional interpretations of Early Cretaceous deformation and mineral growth accompanying accretion of Chukotka to north Asia, followed by regional extension and subsequent convergent deformation.

Post-depositional processes on a buried Cambrian sequence in southern Israel, north Arabian Massif: evidence from new K–Ar dating of Mn-nodules

1995 ◽  
Vol 132 (4) ◽  
pp. 375-385 ◽  
Author(s):  
A. Segev ◽  
L. Halicz ◽  
G. Steinitz ◽  
B. Lang
Keyword(s):  
Early Cretaceous ◽  
Clay Fraction ◽  
Manganese Nodule ◽  
Dead Sea ◽  
Nodule Formation ◽  
Late Devonian ◽  
Tectonic Event ◽  
Depositional Processes ◽  
Host Rocks

AbstractThe Cambrian sedimentary sequence in Israel and adjacent countries marks the beginning of the Phanerozoic sedimentation on the Arabian–Nubian craton. The maximal burial of this sequence, in the southernmost part of Israel, was approximaly 2.5 km. Manganese nodules hosted by shales of the marine Cambrian Timna Formation, Timna Valley, were subjected to K–Ar analysis in order to date their Mn-mineral formation. In addition, the <2 μm clay fraction in the host rock was dated by K–Ar and Rb–Sr methods. The K–Ar ages (average 365 ± 4 Ma) and Rb–Sr isochron (381 ± 10 Ma) of the illitic clay fraction yielded a Middle/Late Devonian age. The results imply that K–Ar and Rb–Sr systems of <2μm illites in the Cambrian host rocks, as well as those enclosed in the Mn nodule insoluble residues, were completely resetin a Middle/Late Devonian thermo-tectonic event, coeval with the beginning of a stratigraphically recorded epeirogenic uplift. The Mn-nodules which were studied fall into two types: (1) nodules constituted by massive, well-crystallized hollandite and pyrolusite; and (2) younger nodules of poorly crystallized massive hollandite and coronadite solid-solutions. Type-1 nodules yielded a calculated Early Cretaceous age of 112 ± 11 Ma, whereas type-2 nodules yielded calculated apparent dates of 20 and 49 Ma. The first age suggests a first stage of manganese nodule formation within the Timna Formation, in Early Cretaceous time, possibly genetically connected with the shallow basic intrusions and volcanic explosive activity in the area. The much younger K–Ar dates of type-2 Mn nodules may be due to late manganese remobilization and mineralization processes. This activity is interpreted as being related to the nearby Tertiary Dead Sea rifting, which was accompanied by low temperature hydrothermal processes.

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