Effect of small potassium-rich dykes on regional gamma-spectrometry image of a potassium-poor volcanic complex: A case from the Doupovské hory Volcanic Complex, NW Czech Republic

Kód výsledku v IS VaVaI

RIV/00025798:_____/09:00000147 - isvavai.cz

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Effect of small potassium-rich dykes on regional gamma-spectrometry image of a potassium-poor volcanic complex: A case from the Doupovské hory Volcanic Complex, NW Czech Republic

Popis výsledku v původním jazyce

The K-anomaly exceeding 2 atomic wt.% over an area of 2x6 km was defined by airborne gamma-spectrometry above the central part of the DHVC. The detailed field study, supported by field and laboratory gamma-spectrometry and geochemical analyses resulted in discovery of a K-rich trachytic dyke-swarm. The existence of differentiated rocks in the DHVC was unknown till present. These dykes are commonly less than 1 m wide, but their K content varies 4-8 atomic wt.%. Owing to this high-K composition and relative abundance of dykes, the dykes significantly modify the regional pattern of gamma-spectrometry data. The K-anomaly cannot be explained by the presence of Flurbühl intrusion dominated by ijolites and essexites, as all these rocks are poor in K, typically not exceeding 1.5 wt.%. On the other hand, much more extensive trachybasaltic lavas with K content varying within the range 1.8?3 wt.% cause only minor or undetectable anomalies.

Název v anglickém jazyce

Effect of small potassium-rich dykes on regional gamma-spectrometry image of a potassium-poor volcanic complex: A case from the Doupovské hory Volcanic Complex, NW Czech Republic

Popis výsledku anglicky

The K-anomaly exceeding 2 atomic wt.% over an area of 2x6 km was defined by airborne gamma-spectrometry above the central part of the DHVC. The detailed field study, supported by field and laboratory gamma-spectrometry and geochemical analyses resulted in discovery of a K-rich trachytic dyke-swarm. The existence of differentiated rocks in the DHVC was unknown till present. These dykes are commonly less than 1 m wide, but their K content varies 4-8 atomic wt.%. Owing to this high-K composition and relative abundance of dykes, the dykes significantly modify the regional pattern of gamma-spectrometry data. The K-anomaly cannot be explained by the presence of Flurbühl intrusion dominated by ijolites and essexites, as all these rocks are poor in K, typically not exceeding 1.5 wt.%. On the other hand, much more extensive trachybasaltic lavas with K content varying within the range 1.8?3 wt.% cause only minor or undetectable anomalies.

Druh

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

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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Projekt

IAA300460602: Model svrchní kůry oherského riftu a jeho okolí

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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

Název periodika

Journal of Volcanology and Geothermal Research

ISSN

0377-0273

e-ISSN

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Svazek periodika

187

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

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Kód UT WoS článku

000271540400003

EID výsledku v databázi Scopus

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