Short-lived eruptive episodes during the construction of a Na-alkalic basaltic field (Perşani Mountains, SE Transylvania, Romania)

Seghedi, Ioan; Popa, Răzvan‐Gabriel; Panaiotu, Cristian; Szakács, Alexandru; Pécskay, Zoltán

doi:10.1007/s00445-016-1063-y

Cited by 23 publications

(24 citation statements)

References 33 publications

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“…For instance, the 1977 Mw 7.2 destructive Vrancea earthquake resulted in over 1500 victims in a densely populated area. In addition, last volcanic eruptions in the Eastern Carpathians located just at the Carpathian Bend interior took place only ~ 30 ka ago (Seghedi et al 2016;Karátson et al 2016), confirming that the link between active tectonics and magmatism. Furthermore, the post volcanic activity transports significant amounts of CO 2 and other volatiles to the surface.…”

Section: Why This Area?mentioning

confidence: 74%

“…1) and the adjacent part of the Transylvanian Basin make it a key area to understand the rapid changes of continental topography in an important part of the Carpathian-Pannonian system of Central Europe. These relevant active processes are linked with subduction roll-back, break-off and associated basin (de)formation, volcanism, post-volcanic activity (gas emanations, ore mineralization), earthquakes and tectonic movements (e.g., salt diapirism, volcano spreading Szakács and Krézsek 2006;Falus et al 2008;Ismail-Zadeh et al 2012;Horváth et al 2006;Seghedi et al 2016;Kis et al 2017). These processes are active or have ceased their impact during the recent evolution of the Carpathians-Transylvanian system).…”

Section: Why This Area?mentioning

confidence: 99%

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Topo-Transylvania: a multidisciplinary Earth science initiative in Central Europe to tackle local and global challenges

Maţenco

2018

Acta Geod Geophys

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Section: Why This Area?mentioning

confidence: 74%

Section: Why This Area?mentioning

confidence: 99%

Topo-Transylvania: a multidisciplinary Earth science initiative in Central Europe to tackle local and global challenges

Maţenco

2018

Acta Geod Geophys

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“…It contains flows, maars, and cinder cones with Ar‐Ar ages of 1.2–0.68 Ma (Panaiotu et al, 2013). Ages indicate six volcanic events (Seghedi et al, 2016) with the one at 1.06 Ma, dwarfing the other ones by volume. More than 90% of the effusive products were formed at 1.06 Ma, which happens to be the third eruptive moment in the life of PVF.…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…The Quaternary alkali basaltic Persani volcanic field (PVF) (Seghedi et al, 2016, Downes et al, 1995 and some older regional references therein) is located about 75 km west of the Vrancea slab and comprises the only direct mantle‐derived material that can shed some light into the nature of dripping. The presence of numerous mantle xenoliths (Falus et al, 2008; Vaselli et al, 1995) in many of the PVF basalts makes the “archive” of mantle material at PVF even more appealing.…”

Section: Introductionmentioning

confidence: 99%

Temporal‐Geochemical Evolution of the Persani Volcanic Field, Eastern Transylvanian Basin (Romania): Implications for Slab Rollback Beneath the SE Carpathians

et al. 2020

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The Quaternary Persani volcanic field (PVF) consists of alkali basalts formed in an extensional basin at the SE end of the Transylvanian basin, near an important anomaly in the European mantle, the Vrancea slab, a seismically active near-vertical lithospheric fragment of debated origin. The PVF is the only basaltic field regionally, has been studied geochemically in the past, and is also known for the presence of abundant mantle xenoliths. Here, we describe new geochemical data on rocks recently dated by Ar-Ar chronometry and show that while we can reproduce virtually all previous results, there is a clear temporal evolution of the magmatic system. There is an increase of over 80°C in temperatures determined by the Si activity thermometer, from 1,300°C to 1,380°C during the~0.5-Myr duration of volcanic activity, which is accompanied by several coherent trends in geochemistry, among which the decrease of Zn/Fe and 87 Sr/ 86 Sr ratios over time. Earlier, higher Zn/Fe ratios are indicative of a pyroxenite/eclogite-dominated source, which gradually changed to a peridotite-dominated source. These characteristics are typical of a dynamic mantle in which vertical mantle lithosphere tectonics, either due to slab rollback or mantle dripping plays a role and are not consistent with simple decompression melting of asthenosphere. Synchronous adakitic rocks found about 25-30 km east of PVF are presumed to be slab melts and are consistent with the Vrancea slab rollback as the trigger for mantle melting responsible for the PVF.

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“…Another Pleistocene monogenetic basalt volcanic field is approximately 40 km from the Ciomadul, at the southeastern part of the Carpathian-Pannonian Region (Figure 1), at the boundary between the Perşani Mountains and the Transylvanian basin Harangi et al, 2013;Seghedi et al, 2016;Seghedi & Szakács, 1994). Basaltic volcanism occurred here between 1.14 Ma and 683 ka (Panaiotu et al, 2004(Panaiotu et al, , 2013 and formed several volcanic centers accompanied by maars, scoriacones, and lava flows.…”

Section: 1029/2018gc008153mentioning

confidence: 99%

Noble Gas and Carbon Isotope Systematics at the Seemingly Inactive Ciomadul Volcano (Eastern‐Central Europe, Romania): Evidence for Volcanic Degassing

Kis

Caracausi

Palcsu

et al. 2019

Geochem Geophys Geosyst

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Ciomadul is the youngest volcano in the Carpathian‐Pannonian Region, Eastern‐Central Europe, which last erupted 30 ka. This volcano is considered to be inactive, however, combined evidence from petrologic and magnetotelluric data, as well as seismic tomography studies, suggests the existence of a subvolcanic crystal mush with variable melt content. The volcanic area is characterized by high CO2 gas output rate, with a minimum of 8.7 × 103 t/year. We investigated 31 gas emissions at Ciomadul to constrain the origin of the volatiles. The δ13C–CO2 and 3He/4He compositions suggest the outgassing of a significant component of mantle‐derived fluids. The He isotope signature in the outgassing fluids (up to 3.10 Ra) is lower than the values in the peridotite xenoliths of the nearby alkaline basalt volcanic field (R/Ra 5.95 Ra ± 0.01), which are representative of a continental lithospheric mantle and significantly lower than MORB values. Considering the chemical characteristics of the Ciomadul dacite, including trace element and Sr–Nd and O isotope compositions, an upper crustal contamination is less probable, whereas the primary magmas could have been derived from an enriched mantle source. The low He isotopic ratios could indicate a strongly metasomatized mantle lithosphere. This could be due to infiltration of subduction‐related fluids and postmetasomatic ingrowth of radiogenic He. The metasomatic fluids are inferred to have contained subducted carbonate material resulting in a heavier carbon isotope composition (δ13C is in the range of −1.4‰ to −4.6‰) and an increase of CO2/3He ratio. Our study shows the magmatic contribution to the emitted gases.

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Short-lived eruptive episodes during the construction of a Na-alkalic basaltic field (Perşani Mountains, SE Transylvania, Romania)

Cited by 23 publications

References 33 publications

Topo-Transylvania: a multidisciplinary Earth science initiative in Central Europe to tackle local and global challenges

Topo-Transylvania: a multidisciplinary Earth science initiative in Central Europe to tackle local and global challenges

Temporal‐Geochemical Evolution of the Persani Volcanic Field, Eastern Transylvanian Basin (Romania): Implications for Slab Rollback Beneath the SE Carpathians

Noble Gas and Carbon Isotope Systematics at the Seemingly Inactive Ciomadul Volcano (Eastern‐Central Europe, Romania): Evidence for Volcanic Degassing

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