Cambrian sedimentary basins of northern Gondwana as geodynamic markers of incipient opening of the Rheic Ocean

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10456057" target="_blank" >RIV/00216208:11310/22:10456057 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WfAZcnOVb9" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WfAZcnOVb9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2021.10.004" target="_blank" >10.1016/j.gr.2021.10.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cambrian sedimentary basins of northern Gondwana as geodynamic markers of incipient opening of the Rheic Ocean

Popis výsledku v původním jazyce

Diachronous opening of the Rheic Ocean and separation of Avalonian-Cadomian terranes from Gondwana began with a change from an active to passive margin in the late Ediacaran to early Cambrian. During the Cambrian, extension within these terranes was recorded by magmatism and by the development of sedimentary basins. However, the timing, style, and kinematics of this transformation still remain poorly understood and plate-scale models vary significantly. To address this issue, the Pribram-Jince basin in the Bohemian Massif was chosen as a case study since it preserves an excellent record of Cambrian rifting. Here, after Cadomian subduction ceased at similar to 527 Ma, extension initiated and a thick pile of continental siliciclastics was deposited in the basin between similar to 515 Ma and similar to 499 Ma, interrupted by marine transgression at similar to 506-503 Ma. Our field, paleocurrent, and rock-magnetic data suggest that the source areas were located to the similar to ESE and to the similar to SW of the basin during the deposition of the lower and upper formations, respectively. Sediment sources changed accordingly from distant metamorphic basement (Gondwana?) and Cadomian volcanic arcs and an accretionary wedge underlying the basin. This redirection marked a change in the tectonic evolution of the basin from orthogonal to dextral oblique extension that enlarged the basin into a pull-apart structure. Integrating this depositional and tectonic record into a large-scale picture, we suggest that strike-slip movements along the former Avalonian-Cadomian belt controlled the diachronous opening of the Rheic Ocean. An inherited suture in the Avalonian ribbon terrane facilitated complete rifting and rift-drift transition while the Cadomian terranes remained attached to Gondwana. The kinematics of this event remains controversial. Either it was opposite along the westerly (sinistral) and easterly (dextral) segments of the belt, which may be explained by interaction with an intervening spreading center, or it was the same dextral transtension. (C) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Název v anglickém jazyce

Cambrian sedimentary basins of northern Gondwana as geodynamic markers of incipient opening of the Rheic Ocean

Popis výsledku anglicky

Diachronous opening of the Rheic Ocean and separation of Avalonian-Cadomian terranes from Gondwana began with a change from an active to passive margin in the late Ediacaran to early Cambrian. During the Cambrian, extension within these terranes was recorded by magmatism and by the development of sedimentary basins. However, the timing, style, and kinematics of this transformation still remain poorly understood and plate-scale models vary significantly. To address this issue, the Pribram-Jince basin in the Bohemian Massif was chosen as a case study since it preserves an excellent record of Cambrian rifting. Here, after Cadomian subduction ceased at similar to 527 Ma, extension initiated and a thick pile of continental siliciclastics was deposited in the basin between similar to 515 Ma and similar to 499 Ma, interrupted by marine transgression at similar to 506-503 Ma. Our field, paleocurrent, and rock-magnetic data suggest that the source areas were located to the similar to ESE and to the similar to SW of the basin during the deposition of the lower and upper formations, respectively. Sediment sources changed accordingly from distant metamorphic basement (Gondwana?) and Cadomian volcanic arcs and an accretionary wedge underlying the basin. This redirection marked a change in the tectonic evolution of the basin from orthogonal to dextral oblique extension that enlarged the basin into a pull-apart structure. Integrating this depositional and tectonic record into a large-scale picture, we suggest that strike-slip movements along the former Avalonian-Cadomian belt controlled the diachronous opening of the Rheic Ocean. An inherited suture in the Avalonian ribbon terrane facilitated complete rifting and rift-drift transition while the Cadomian terranes remained attached to Gondwana. The kinematics of this event remains controversial. Either it was opposite along the westerly (sinistral) and easterly (dextral) segments of the belt, which may be explained by interaction with an intervening spreading center, or it was the same dextral transtension. (C) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Gondwana Research

ISSN

1342-937X

e-ISSN

1878-0571

Svazek periodika

105

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

22

Strana od-do

492-513

Kód UT WoS článku

000799291900003

EID výsledku v databázi Scopus

2-s2.0-85119196947