Hot plutonism in a cold accretionary wedge: What terminated the Cadomian orogeny along the northern periphery of Gondwana?
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10475293" target="_blank" >RIV/00216208:11310/23:10475293 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xxUeNOd-KK" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xxUeNOd-KK</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.precamres.2023.107041" target="_blank" >10.1016/j.precamres.2023.107041</a>
Alternative languages
Result language
angličtina
Original language name
Hot plutonism in a cold accretionary wedge: What terminated the Cadomian orogeny along the northern periphery of Gondwana?
Original language description
The late Ediacaran to Cambrian end of the Cadomian accretionary orogeny was likely a complex cascade of events that culminated in the opening of the Rheic Ocean and formation of a passive margin along the northern Gondwana periphery. However, the geodynamic causes and kinematics of this protracted transition remain elusive. To address this issue, we examine the emplacement and tectonic setting of the ca. 524-523 Ma, shallow-evel Kdyne gabbro to diorite pluton in the southwestern part of the Bohemian Massif as it represents the earliest event following the end of the Cadomian trench-sediment accretion at around 527 Ma. Our structural analysis combined with investigation of the anisotropy of magnetic susceptibility (AMS) suggests that the pluton was emplaced via magma wedging, some minor lateral expansion, and magmatic stoping, when the ascending magma utilized a network of orthogonal extension fractures (~NNE-SSW and ~WNW-ESE). Furthermore, the pluton is interpreted as an apical part of a dome located in an extensional stepover between two dextral transtensional zones, forming a large-scale structure resembling a metamorphic core complex. Nevertheless, our data imply that final pluton emplacement was controlled by magma buoyancy and less so by regional tectonic deformation. We suggest that these structural features together with the remarkably short time span between the end of Cadomian accretion and the earliest plutonism in the overall cold forearc region are compatible with slab break-off as the potential geodynamic cause of the necessary rapid heat input into the base of the host accretionary wedge. Taken together, the high-temperature events following Cadomian accretion, represented by the Kdyn.e pluton and other Cambrian plutons as young as ca. 505 Ma, suggest that magmatism may have been an important geodynamic driver of the Cambro-Ordovician rifting of northern Gondwana and that the rifting mode was active during at least the initial stages before being overridden by the slab pull force of the subducting Iapetus Ocean.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Precambrian Research
ISSN
0301-9268
e-ISSN
1872-7433
Volume of the periodical
390
Issue of the periodical within the volume
June
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
18
Pages from-to
107041
UT code for WoS article
000982308400001
EID of the result in the Scopus database
2-s2.0-85152132209