The Late Carboniferous Schönfeld–Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F16%3A00000171" target="_blank" >RIV/00025798:_____/16:00000171 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.jgeosci.org" target="_blank" >http://www.jgeosci.org</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.219" target="_blank" >10.3190/jgeosci.219</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Late Carboniferous Schönfeld–Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution

Popis výsledku v původním jazyce

The Altenberg–Teplice Volcanic Complex (ATVC) exposed on both sides of the German–Czech border in the Erzgebirge/Krušné hory Mts. is one of the earliest late Variscan to post-Variscan volcanic centres in Europe. The ATVC features an early volcanosedimentary succession preserved in the Schönfeld–Altenberg Depression Complex (SADC), covered by volcanics of the Teplice Rhyolite. The SADC was subdivided into the Schönfeld-Pre-Eruptive Sediments (SPES), and the volcanosedimentary successions of the Lower Schönfeld Complex (LSC) and the Upper Schönfeld Complex (USC). The SPES is deposited on metamorphic basement and consists of sandstones and conglomerates with variable types of metamorphic clasts; it also contains carbonaceous layers. The LSC sequence starts with widespread, fine-grained ignimbrites of rhyolitic composition. The explosive phase of the LSC was followed by the formation of trachydacitic lavas and subvolcanic bodies. The USC sequence commences with coarse-grained talus deposits, consisting of metamorphic clasts, indicating a major tectonic activity. Lavas and pyroclastic rocks dominate the USC in the southern part, whereas lava dome explosion-related pyroclastic and sedimentary deposits prevail in the Schönfeld area. Charcoal fragments and fine charcoal dust is present in all SADC units as layers, or in the matrix of volcanosedimentary deposits. Presumably, formation of charcoal was related to explosive eruptions and/or wild fires, and redeposition by alluvial processes. The SADC volcanic rocks are classified as dacites, trachy-dacites and rhyolites, having unusually elevated concentrations of Ti and compatible elements like Cr and V. Compared to the LSC, the USC volcanics show a less alkaline affinity. The studied samples are isotopically homogeneous, with Nd325= –2.4 to –3.3 and 87Sr/86Sr325 = 0.70556–0.70626, pointing to a common source of magmas to both the LSC and the USC. The two-stage Nd model ages vary between 1.2 and 1.3 Ga.

Název v anglickém jazyce

The Late Carboniferous Schönfeld–Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution

Popis výsledku anglicky

The Altenberg–Teplice Volcanic Complex (ATVC) exposed on both sides of the German–Czech border in the Erzgebirge/Krušné hory Mts. is one of the earliest late Variscan to post-Variscan volcanic centres in Europe. The ATVC features an early volcanosedimentary succession preserved in the Schönfeld–Altenberg Depression Complex (SADC), covered by volcanics of the Teplice Rhyolite. The SADC was subdivided into the Schönfeld-Pre-Eruptive Sediments (SPES), and the volcanosedimentary successions of the Lower Schönfeld Complex (LSC) and the Upper Schönfeld Complex (USC). The SPES is deposited on metamorphic basement and consists of sandstones and conglomerates with variable types of metamorphic clasts; it also contains carbonaceous layers. The LSC sequence starts with widespread, fine-grained ignimbrites of rhyolitic composition. The explosive phase of the LSC was followed by the formation of trachydacitic lavas and subvolcanic bodies. The USC sequence commences with coarse-grained talus deposits, consisting of metamorphic clasts, indicating a major tectonic activity. Lavas and pyroclastic rocks dominate the USC in the southern part, whereas lava dome explosion-related pyroclastic and sedimentary deposits prevail in the Schönfeld area. Charcoal fragments and fine charcoal dust is present in all SADC units as layers, or in the matrix of volcanosedimentary deposits. Presumably, formation of charcoal was related to explosive eruptions and/or wild fires, and redeposition by alluvial processes. The SADC volcanic rocks are classified as dacites, trachy-dacites and rhyolites, having unusually elevated concentrations of Ti and compatible elements like Cr and V. Compared to the LSC, the USC volcanics show a less alkaline affinity. The studied samples are isotopically homogeneous, with Nd325= –2.4 to –3.3 and 87Sr/86Sr325 = 0.70556–0.70626, pointing to a common source of magmas to both the LSC and the USC. The two-stage Nd model ages vary between 1.2 and 1.3 Ga.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Geosciences

ISSN

1802-6222

e-ISSN

—

Svazek periodika

61

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

16

Strana od-do

371-393

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—