Reassessment of the Pennsylvanian bio- and chronostratigraphy of the Saar-Lorraine Basin using high-precision U–Pb ages of volcanic ashes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F25%3A00617546" target="_blank" >RIV/67985530:_____/25:00617546 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/25:10498752

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0166516225000412?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0166516225000412?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.coal.2025.104724" target="_blank" >10.1016/j.coal.2025.104724</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Reassessment of the Pennsylvanian bio- and chronostratigraphy of the Saar-Lorraine Basin using high-precision U–Pb ages of volcanic ashes

Popis výsledku v původním jazyce

Chronostratigraphic calibration of the Westphalian and early Stephanian succession in the Saar-Lorraine Basin ofnGermany and France has been improved using high-precision U–Pb zircon dating of intercalated tonsteinsn(volcanic ashes) in coal seams. The clay mineralogy and elemental composition were determined to specify thensource of these volcanic ashes and the post-depositional weathering processes. Samples selected for dating werentonsteins with homogeneous zircons without zoning to avoid the inherited ages from the volcanic chamber. Fournof them provided concordant ages in agreement with their stratigraphic position. New radiometric ages constrainnthe hiatus below the Holz Conglomerate approximately between 307.9 and 306.0 Ma, that corresponds to thenearly and mid-Cantabrian substage as defined in its type area, the NW Spain. The age of T600 tonstein, whichncorresponds in Saar-Lorraine Basin to the Duckmantian/Bolsovian boundary is fully in agreement with ages ofnthat boundary determined in the Ruhr Basin of the Variscan foreland and in continental basins of the BohemiannMassif. T10 tonstein on top of the Westphalian succession confirms its late Asturian age previously determinednfrom macroflora. T00 tonstein in the Ottweiler Group provided a mid-Barruelian age, which allowed to re-definenmacrofloral biozones in the lower part of that group from Alethopteris zeilleri of Saberian substage to Crenulopterisnlamuriana of Barruelian substage. New U–Pb ages further improved correlation of local lithostratigraphic unitsnwith other basins in Europe and also with global marine-based stages. These new ages allow us to comparenradioisotopically constrained Bayesian age model to metronomic age models from Bolsovian to Barruelian andnshow that the high frequency sequences fall in the range of the precession and obliquity. The sources of thenvolcanic ashes were probably volcanoes in the Vosges and Black Forest massifs. Considered could be also volncanic centers at a larger distance, e.g., the Teplice-Altenberg volcanic complex for Westphalian, Gothard and Aarnmassifs in Alps and the Thüringian Forest in Saxony for Stephanian and Autunian tonsteins. The detrital zirconsnextracted from the sandstones of the Bolsovian deposits and Holz Conglomerate (late Cantabrian) show a widenrange of ages from Precambrian to Ordovician that confirms the northward source of these zircons (Rhenonhercynian zone) mixed with a local source from the Mid-German Crystalline High.

Název v anglickém jazyce

Reassessment of the Pennsylvanian bio- and chronostratigraphy of the Saar-Lorraine Basin using high-precision U–Pb ages of volcanic ashes

Popis výsledku anglicky

Chronostratigraphic calibration of the Westphalian and early Stephanian succession in the Saar-Lorraine Basin ofnGermany and France has been improved using high-precision U–Pb zircon dating of intercalated tonsteinsn(volcanic ashes) in coal seams. The clay mineralogy and elemental composition were determined to specify thensource of these volcanic ashes and the post-depositional weathering processes. Samples selected for dating werentonsteins with homogeneous zircons without zoning to avoid the inherited ages from the volcanic chamber. Fournof them provided concordant ages in agreement with their stratigraphic position. New radiometric ages constrainnthe hiatus below the Holz Conglomerate approximately between 307.9 and 306.0 Ma, that corresponds to thenearly and mid-Cantabrian substage as defined in its type area, the NW Spain. The age of T600 tonstein, whichncorresponds in Saar-Lorraine Basin to the Duckmantian/Bolsovian boundary is fully in agreement with ages ofnthat boundary determined in the Ruhr Basin of the Variscan foreland and in continental basins of the BohemiannMassif. T10 tonstein on top of the Westphalian succession confirms its late Asturian age previously determinednfrom macroflora. T00 tonstein in the Ottweiler Group provided a mid-Barruelian age, which allowed to re-definenmacrofloral biozones in the lower part of that group from Alethopteris zeilleri of Saberian substage to Crenulopterisnlamuriana of Barruelian substage. New U–Pb ages further improved correlation of local lithostratigraphic unitsnwith other basins in Europe and also with global marine-based stages. These new ages allow us to comparenradioisotopically constrained Bayesian age model to metronomic age models from Bolsovian to Barruelian andnshow that the high frequency sequences fall in the range of the precession and obliquity. The sources of thenvolcanic ashes were probably volcanoes in the Vosges and Black Forest massifs. Considered could be also volncanic centers at a larger distance, e.g., the Teplice-Altenberg volcanic complex for Westphalian, Gothard and Aarnmassifs in Alps and the Thüringian Forest in Saxony for Stephanian and Autunian tonsteins. The detrital zirconsnextracted from the sandstones of the Bolsovian deposits and Holz Conglomerate (late Cantabrian) show a widenrange of ages from Precambrian to Ordovician that confirms the northward source of these zircons (Rhenonhercynian zone) mixed with a local source from the Mid-German Crystalline High.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GF22-11661K" target="_blank" >GF22-11661K: Integrovaná stratigrafie mladšího paleozoika ve východní části tropické Pangey</a><br>

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

International Journal of Coal Geology

ISSN

0166-5162

e-ISSN

1872-7840

Svazek periodika

302

Číslo periodika v rámci svazku

Apr.

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

31

Strana od-do

104724

Kód UT WoS článku

001433622900001

EID výsledku v databázi Scopus

2-s2.0-85218354453