Geophysical signature of a buried maar diatreme in the Krkonoše-Jizera Granite Massif (Czech Republic)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000077" target="_blank" >RIV/00025798:_____/21:00000077 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Geophysical signature of a buried maar diatreme in the Krkonoše-Jizera Granite Massif (Czech Republic)

Popis výsledku v původním jazyce

We present results and a method to geophysically image the subsurface structure of Pytlácká jáma Pit within the Lusatian Volcanic Field of the Eger Rift. The Pytlácká jáma Pit (Rybí loučky nature reserve) is located in the Jizerské hory Mts. in the northern Czech Republic near the state border with Poland. This dominant geomorphologic depression has been previously described as the only example of a glacial cirque in the Jizerské hory Mts. Our high-resolution geophysical data demonstrate its volcanic origin. It is the first maar diatreme ever identified within the Upper Carboniferous Krkonoše-Jizera Granite Massif. The size, shape, depth and geometry of the Pytlácká jáma maar-diatreme interior is described by a combination of ground magnetic and gravity survey with electrical resistivity tomography (ERT). Its funnel-shaped structure is deeply eroded and buried under alluvial, colluvial and glacial sediments, which form mainly from the local Jizera Granite bedrock. The phreatic eruption and maar-diatreme basaltic formation could be an indirect consequence of similar effusive activity near the Bukovec Volcano. Identification of the Pytlácká jáma Pit as a maar diatreme can explain the origin and evolution of the cirque-shaped hollow, and moreover the presence of the gemstones – sapphires and zircons - in nearby Jizerka rivulet alluvial sediments. Such volcanic structures are the attributed provenance of sapphire and ruby deposits in Australia and Southeast Asia (Sutherland et al. 2015).

Název v anglickém jazyce

Geophysical signature of a buried maar diatreme in the Krkonoše-Jizera Granite Massif (Czech Republic)

Popis výsledku anglicky

We present results and a method to geophysically image the subsurface structure of Pytlácká jáma Pit within the Lusatian Volcanic Field of the Eger Rift. The Pytlácká jáma Pit (Rybí loučky nature reserve) is located in the Jizerské hory Mts. in the northern Czech Republic near the state border with Poland. This dominant geomorphologic depression has been previously described as the only example of a glacial cirque in the Jizerské hory Mts. Our high-resolution geophysical data demonstrate its volcanic origin. It is the first maar diatreme ever identified within the Upper Carboniferous Krkonoše-Jizera Granite Massif. The size, shape, depth and geometry of the Pytlácká jáma maar-diatreme interior is described by a combination of ground magnetic and gravity survey with electrical resistivity tomography (ERT). Its funnel-shaped structure is deeply eroded and buried under alluvial, colluvial and glacial sediments, which form mainly from the local Jizera Granite bedrock. The phreatic eruption and maar-diatreme basaltic formation could be an indirect consequence of similar effusive activity near the Bukovec Volcano. Identification of the Pytlácká jáma Pit as a maar diatreme can explain the origin and evolution of the cirque-shaped hollow, and moreover the presence of the gemstones – sapphires and zircons - in nearby Jizerka rivulet alluvial sediments. Such volcanic structures are the attributed provenance of sapphire and ruby deposits in Australia and Southeast Asia (Sutherland et al. 2015).

Druh

V_souhrn - Souhrnná výzkumná zpráva

CEP obor

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OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Počet stran výsledku

21

Místo vydání

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Název nakladatele resp. objednatele

ČGS

Verze

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