Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F19%3A00504671" target="_blank" >RIV/67985831:_____/19:00504671 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/19:10394634

Result on the web

<a href="https://pubs.geoscienceworld.org/gsa/gsabulletin/article/131/5-6/997/566860/Emplacement-dynamics-of-syncollapse-ring-dikes-An" target="_blank" >https://pubs.geoscienceworld.org/gsa/gsabulletin/article/131/5-6/997/566860/Emplacement-dynamics-of-syncollapse-ring-dikes-An</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1130/B35019.1" target="_blank" >10.1130/B35019.1</a>

Result language

angličtina

Original language name

Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif

Original language description

The late Carboniferous Altenberg-Teplice caldera in the northwestern Bohemian Massif provides an intriguing example of rhyolite eruptions evolving to a trapdoor collapse and coeval ring dike emplacement. Geochemical data suggest that withdrawal of an underlying stratified magma chamber beneath the caldera took place in two steps. Eruptions of the reversely zoned Teplice rhyolite drained the chamber, followed by a trapdoor collapse of the caldera floor and emplacement of voluminous microgranite ring dike system at 312 Ma. The mechanism proposed here is that the subsiding caldera floor increased vertical load on the magma chamber and triggered remobilization of residual, cumulate-like, and otherwise non-eruptible magma mush. The magnetic fabrics (determined using the anisotropy of magnetic susceptibility [AMS]), carried by paramagnetic ferrosilicates and titanomagnetite, indicate that the ring dike magma first flowed upwards via four main feeder domains from which the magma was then distributed laterally. The asymmetric trapdoor collapse generated domains of dilation and contraction along the caldera limit, evidenced by different shapes of fabric ellipsoids and uneven apparent width of the individual ring dike segments. Based on this case example, we develop a general kinematic model for polyphase caldera collapse and ring dike emplacement, invoking a combination of multiple space-making processes: piston and trapdoor collapses together with downsag and faulting of the caldera floor, regional tectonic extension, reactivation of the preexisting structures, and volume changes in the caldera floor due to thermal stresses.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geological Society of America Bulletin

ISSN

0016-7606

e-ISSN

—

Volume of the periodical

131

Issue of the periodical within the volume

5/6

Country of publishing house

US - UNITED STATES

Number of pages

20

Pages from-to

997-1016

UT code for WoS article

000466511700015

EID of the result in the Scopus database

2-s2.0-85066755974