The Eo-Variscan domain in the Variscan belt: New data from the Sudetes, southern Poland

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00618716" target="_blank" >RIV/67985831:_____/25:00618716 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0024493725001173" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0024493725001173</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.lithos.2025.108058" target="_blank" >10.1016/j.lithos.2025.108058</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Eo-Variscan domain in the Variscan belt: New data from the Sudetes, southern Poland

Popis výsledku v původním jazyce

The Variscan belt in Europe includes Eo-Variscan domains whose tectono-metamorphic evolution ended before the Carboniferous. In the Bohemian Massif, these are the Teplá-Barrandian terrain and the Góry Sowie Massif – Kłodzko Metamorphic Massif terrain, jointly referred to as the Bohemian Terrane, which is partially concealed beneath the North Bohemian Cretaceous Basin. Terrains on either side of this basin differ in several aspects. Northern Bohemia is accompanied by dismembered ophiolite (c. 400 Ma) and preserves fragments of late Devonian overstep succession – features missing in the Teplá-Barrandian terrain. New zircon U–Pb and O isotope analyses indicate that the Góry Sowie Massif is composed primarily of metasedimentary rocks with a maximum depositional age of 540 Ma, along with minor metaigneous rocks with protolith ages of c. 500–490 Ma. Oxygen isotope study suggests crustal derivation of felsic rocks (δ18OZrn values of 8.14–11.29 ‰) and local pulses of mantle melting for minor basites (δ18OZrn values of 5.10–8.36 ‰). Neither Cadomian basement nor Neoproterozoic magmatic arc, characteristic for the Teplá-Barrandian domain, is in evidence in the Góry Sowie Massif. Detrital zircon age spectra for the Góry Sowie Massif reveal three clusters: 2.8–2.4 Ga, 2.1–1.9 Ga, and 650–540 Ma also known from the adjacent Saxothuringian units. However, the Góry Sowie Massif spectra contain more Neoarchaean and Mesoproterozoic components, and fewer Neoproterozoic components, suggesting different positions for the Góry Sowie Massif and Saxothuringia in the peri-Gondwana realm during the Cambrian. The two Eo-Variscan parts of the Bohemian terrane have probably constituted the composite terrane of Bohemia since the Early/Middle Devonian and further acted as a single microcontinent. In the Góry Sowie Massif, metamorphic zircon grains dated to ca. 390–380 Ma preserve evidence of the mid-Devonian collision between the western margin of the Góry Sowie Massif–Kłodzko Metamorphic Massif block and the Saxothuringiarelated sub-terrane. In the Kłodzko Metamorphic Massif, slightly metamorphosed mudstones (Frasnian depositional age), below the nonconformity, contain detrital zircons of metamorphic origin dated at c. 390–370 Ma, sourced from the Góry Sowie area. The Eo-Variscan domain was finally brought to the surface in the Frasnian/ Famennian as constrained by previous biostratigraphical data from a nonconformably overstepping sedimentary succession on its flanks. The more distant Famennian pelagic deposits in the Bardo Structure acquired c.390–365 Ma euhedral zircons of volcanogenic provenance, prior to the Variscan collision between the Saxothuringian and Bohemian terranes.

Název v anglickém jazyce

The Eo-Variscan domain in the Variscan belt: New data from the Sudetes, southern Poland

Popis výsledku anglicky

The Variscan belt in Europe includes Eo-Variscan domains whose tectono-metamorphic evolution ended before the Carboniferous. In the Bohemian Massif, these are the Teplá-Barrandian terrain and the Góry Sowie Massif – Kłodzko Metamorphic Massif terrain, jointly referred to as the Bohemian Terrane, which is partially concealed beneath the North Bohemian Cretaceous Basin. Terrains on either side of this basin differ in several aspects. Northern Bohemia is accompanied by dismembered ophiolite (c. 400 Ma) and preserves fragments of late Devonian overstep succession – features missing in the Teplá-Barrandian terrain. New zircon U–Pb and O isotope analyses indicate that the Góry Sowie Massif is composed primarily of metasedimentary rocks with a maximum depositional age of 540 Ma, along with minor metaigneous rocks with protolith ages of c. 500–490 Ma. Oxygen isotope study suggests crustal derivation of felsic rocks (δ18OZrn values of 8.14–11.29 ‰) and local pulses of mantle melting for minor basites (δ18OZrn values of 5.10–8.36 ‰). Neither Cadomian basement nor Neoproterozoic magmatic arc, characteristic for the Teplá-Barrandian domain, is in evidence in the Góry Sowie Massif. Detrital zircon age spectra for the Góry Sowie Massif reveal three clusters: 2.8–2.4 Ga, 2.1–1.9 Ga, and 650–540 Ma also known from the adjacent Saxothuringian units. However, the Góry Sowie Massif spectra contain more Neoarchaean and Mesoproterozoic components, and fewer Neoproterozoic components, suggesting different positions for the Góry Sowie Massif and Saxothuringia in the peri-Gondwana realm during the Cambrian. The two Eo-Variscan parts of the Bohemian terrane have probably constituted the composite terrane of Bohemia since the Early/Middle Devonian and further acted as a single microcontinent. In the Góry Sowie Massif, metamorphic zircon grains dated to ca. 390–380 Ma preserve evidence of the mid-Devonian collision between the western margin of the Góry Sowie Massif–Kłodzko Metamorphic Massif block and the Saxothuringiarelated sub-terrane. In the Kłodzko Metamorphic Massif, slightly metamorphosed mudstones (Frasnian depositional age), below the nonconformity, contain detrital zircons of metamorphic origin dated at c. 390–370 Ma, sourced from the Góry Sowie area. The Eo-Variscan domain was finally brought to the surface in the Frasnian/ Famennian as constrained by previous biostratigraphical data from a nonconformably overstepping sedimentary succession on its flanks. The more distant Famennian pelagic deposits in the Bardo Structure acquired c.390–365 Ma euhedral zircons of volcanogenic provenance, prior to the Variscan collision between the Saxothuringian and Bohemian terranes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Lithos

ISSN

0024-4937

e-ISSN

1872-6143

Svazek periodika

504-505

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

108058

Kód UT WoS článku

001456523200001

EID výsledku v databázi Scopus

2-s2.0-105000579484