Volcanic evolution and stratigraphy of the Miocene Börzsöny Mountains, Hungary: an integrated study.

Karátson, D ✉ [Karátson, Dávid (vulkanológia, geo...), szerző] Természetföldrajzi Tanszék (ELTE / TTK / Frt_K); Márton, E [Márton Péterné Szalay, Emőke (Geofizika, paleom...), szerző]; Harangi, Sz [Harangi, Szabolcs (Magmás geokémia), szerző] Kőzettan-Geokémiai Tanszék (ELTE / TTK / Ft_K); Józsa, S [Józsa, Sándor (geológia), szerző] Kőzettan-Geokémiai Tanszék (ELTE / TTK / Ft_K); Balogh, K [Balogh, Kadosa (Izotóp geológia), szerző] MTA Atommagkutató Intézet; Pécskay, Z [Pécskay, Zoltán (K-Ar módszeres ko...), szerző] MTA Atommagkutató Intézet; Kovácsvölgyi, S; Szakmány, Gy [Szakmány, György (Geológia), szerző] Kőzettan-Geokémiai Tanszék (ELTE / TTK / Ft_K); Dulai, A [Dulai, Alfréd (Őslénytan, Földtan), szerző]

Angol nyelvű Szakcikk (Folyóiratcikk) Tudományos
Megjelent: GEOLOGICA CARPATHICA 1335-0552 1336-8052 51 (5) pp. 325-343 2000
  • X. Földtudományok Osztálya: A
  • SJR Scopus - Geology: Q2
Azonosítók
Szakterületek:
  • Föld- és kapcsolódó környezettudományok
The Middle Miocene volcanic evolution of the Borzsony Mountains, North Hungary, is presented, correlating new volcanological, petrological, geochemical, geophysical and paleontological data and establishing a detailed stratigraphy on the basis of additional K/Ar radiometric and paleomagnetic measurements. For the earliest volcanic activity, previous biostratigraphy showing an Early Badenian age has been confirmed and precisely defined by paleomagnetic investigations. The first-stage volcanic formations (16.5-16.0 Ma), deposited in a shallow marine environment, include resedimented, syn-eruptive, garnet-bearing dacitic volcaniclastics (originating mostly from small-scale ignimbrite eruptions) and coeval, garnet-bearing dacitic lava domes, sometimes with their volcaniclastic aprons. As the eruptions filled the marine basin, subaerial dacitic-andesitic volcaniclastics, comprising minor ignimbrites and different types of debris-flow deposits were also deposited. A part of the latter may have been related to the formation of two or three medium-sized calderas. The second stage (16.0-14.5 Ma) was characterized by andesitic lava dome activity terminated by a hydrothermal event. During the first half of this stage, a ca. 30 degrees CCW rotation occurred. The third stage produced the most voluminous, moderately explosive, andesitic - basaltic andesitic High Borzsony subaerial lava dome complex erupting up to the Badenian/Sarmatian boundary (ca. 13.7 Ma). Correlation of K/Ar geochronological and volcanological data shows that lava dome activity of the second and third stage may have been coeval with marine sedimentation in the southern Borzsony.
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2025-02-08 03:38