Počet záznamů: 1
On the anatomy and structural control of a dyke swarm that fed caldera-forming ignimbrite eruptions
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SYSNO ASEP 0574886 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On the anatomy and structural control of a dyke swarm that fed caldera-forming ignimbrite eruptions Tvůrce(i) Tomek, Filip (GLU-S) RID, ORCID, SAI
Olšanská, I. (CZ)
Trubač, J. (CZ)
Černý, Jan (GLU-S) RID, ORCID, SAI
Rejšek, Jan (GLU-S) SAI
Ackerman, Lukáš (GLU-S) RID, SAI, ORCIDČíslo článku jgs2022-119 Zdroj.dok. Journal of the Geological Society. - : Geological Society Publishing House - ISSN 0016-7649
Roč. 180, č. 5 (2023)Poč.str. 18 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Anisotropy of Magnetic Susceptibility ; Ignimbrite Caldera ; Pyroclastic Density Current ; Volcano Feeder Dyke ; Volcano Tectonics Obor OECD Geology CEP GJ19-02177Y GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora GLU-S - RVO:67985831 UT WOS 001079766600001 DOI 10.1144/jgs2022-119 Anotace The evolution of eruptive vents related to calderas is not fully understood. We focus on a structural, rock-magnetic and geochemical investigation of a 314 Ma rhyolite dyke swarm associated with the late-orogenic Altenberg–Teplice Caldera, Bohemian Massif, eastern Variscan belt. The whole-rock major element, trace element and Nd–Pb isotope geochemistry along with the published U–Pb zircon geochronology link the extra-caldera dyke swarm with intra-caldera ignimbrites. The magnetic fabrics determined using the anisotropy of magnetic susceptibility are interpreted to record a continuum from magma ascent to emplacement and eruption during sinistral shearing. The latter evidences an interplay with regional tectonics associated with the activity of crustal-scale shear zones. The sinistral kinematics and strike of the dyke swarm, the elongation of caldera intrusive units, and the kinematics of major caldera faults are consistent with the dextral Riedel shear system, where the dykes correspond to antithetic R’ or X shears. Such a kinematic configuration implies that the maximum and minimum principal stresses were oriented roughly north–south and east–west, respectively. The relation between the stress field and the caldera elongation and orientation is not typical. We suggest that a pre-existing mutually perpendicular set of cross-cutting structural lineaments largely controlled the magma chamber and caldera formation. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2024 Elektronická adresa https://www.lyellcollection.org/doi/10.1144/jgs2022-119
Počet záznamů: 1