Three-dimensional P-wave velocity image under the Carpathian arc

Oncescu, Mihnea Corneliu; Burlacu, Valentin; Anghel, Marian; Smalbergher, V.

doi:10.1016/0040-1951(84)90182-3

Cited by 76 publications

(35 citation statements)

References 12 publications

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“…However, the Vrancea region at the southern termination of the Outer Eastern Carpathians is the only place in the Carpathian-Pannonian region where subcrustal earthquakes down to 200 km depth and with magnitude up to 7.7 occur. Velocity structure and focal depth distribution depict a slab steeply dipping towards the southwest with an angle of about 60 ° (Oncescu et al, 1984). The slab is probably detached, as suggested by a seismic gap between 40 and 70 km, and sinking under its own weight into the lithosphere.…”

Section: Seismicity and Recent Stress Fieldmentioning

confidence: 93%

Stress-induced late-stage subsidence anomalies in the Pannonian basin

1996

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Subsidence, sedimentation and tectonic quiescence of the Pannonian basin was interrupted a few million years ago by tectonic reactivation. This recent activity has manifested itself in uplift of the western and eastern flanks, and continuing subsidence of the central part of the Pannonian basin. Low-to medium-magnitude earthquakes of the CarpathianPannonian region are generated mostly in the upper crust by reverse and wrench fault mechanisms. There is no evidence for earthquakes of extensional origin.2-D model calculation of the subsidence history shows that a recent increase in magnitude of horizontal compressional intraplate stress can explain fairly well the observed Quaternary uplift and subsidence pattern. We propose that this stress increase is caused by the overall Europe/Africa convergence. In Late Pliocene, consumption of subductible lithosphere at the eastern margin of the Pannonian basin was completed, and the lithosphere underlying the Pannonian basin became locked in a stable continental frame. Consequently extensional basin formation has come to an end, and compressional inversion of the Pannonian basin is in progress.

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Section: Seismicity and Recent Stress Fieldmentioning

confidence: 93%

Stress-induced late-stage subsidence anomalies in the Pannonian basin

1996

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“…Slab break-off is now thought to be in its fi nal stages beneath the southern part of the Eastern Carpathians (Vrancea zone Fig. 2B), where a near-vertical subducted slab causes intermediate depth seismicity (Oncescu et al, 1984;Oncescu and Bonjer, 1997;Sperner et al, 2001). Seismic tomographic and gravity modeling indicate that this slab is still hanging (Fan et al, 1998;Wenzel et al, 1998Wenzel et al, , 2002Sperner et al, 2001Sperner et al, , 2004.…”

Section: Geodynamic Settingmentioning

confidence: 99%

Genesis of the Neogene to Quaternary volcanism in the Carpathian-Pannonian region: Role of subduction, extension, and mantle plume

Harangi

Lenkey

2007

Cenozoic Volcanism in the Mediterranean Area

124

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Neogene to Quaternary volcanism of the Carpathian-Pannonian region is part of the extensive volcanic activity in the Mediterranean and surrounding regions. Using the spatial and temporal distribution of the magmatic rocks, their major-and traceelement features, and Sr-Nd-Pb isotope characteristics, we suggest that lithospheric extension in the Pannonian Basin had a major role in the generation of the magmas. Dehydration of subducting slab should have resulted in thorough metasomatism in the mantle wedge during Cretaceous to early Miocene that would have lowered the melting temperature, therefore playing an indirect role in the generation of magmas later on. Mixing between mantle-derived magmas and lower-crustal melts was an important process at the fi rst stage of the silicic and calc-alkaline magmatism in the Northern Pannonian Basin. However, the crustal component gradually decreased with time, which is consistent with magmatic activity in a continuously thinning continental plate. Calc-alkaline volcanism along the Eastern Carpathians was mostly postcollisional and could have been related to slab break-off processes. However, the fairly young (<1.5 Ma) potassic magmatism at the southeasternmost segment of the Carpathian volcanic arc could be explained by lithospheric delamination under the Vrancea zone. Alkaline basaltic volcanism began at the end of rifting of the Pannonian Basin (11 Ma) and continued until recently. We suggest that a mantle plume beneath the Pannonian Basin is highly unlikely and the mafi c magmas were formed by small degree partial melting in a heterogeneous asthenospheric mantle, which has been close to the solidus temperature due to the lithospheric extension in the Miocene. Magmatism appears to have been in a waning phase for the last 2 m.y., but recent volcanic eruptions (<200 k.y.) indicate that future volcanic activity cannot be unambiguously ruled out.

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“…Post-collisional slab detachment is considered to have occurred gradually from west to east-southeast as a zipper-like process (Tomek & Hall 1993;Mason et al 1998;Wortel & Spakman 2000;Sperner et al 2002). The slab break-off is now in the final stage beneath the southern part of the Eastern Carpathians (Vrancea zone), where the detaching near vertical subducted slab causes intermediate depth seismicity (Oncescu et al 1984;Oncescu & Benjer 1997;Sperner et al 2001). Chalot-Prat & Gîrbacea (2000) suggested partial delamination of the lithospheric mantle beneath this region.…”

Section: Cenozoic Subduction Zones In the Alpine-mediterranean Regionmentioning

confidence: 99%