Reconstruction of ancient volcanic complexes using magnetic signature: A case study from Cambrian andesite lava flow, Bohemian Massif

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F22%3A00558657" target="_blank" >RIV/67985831:_____/22:00558657 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/22:00125910

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0377027322001226?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0377027322001226?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jvolgeores.2022.107591" target="_blank" >10.1016/j.jvolgeores.2022.107591</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Reconstruction of ancient volcanic complexes using magnetic signature: A case study from Cambrian andesite lava flow, Bohemian Massif

Popis výsledku v původním jazyce

Reconstruction of the Upper Cambrian Křivoklát-Rokycany Volcanic Complex was made using anisotropy ofmagnetic susceptibility (AMS). The correlation of AMS with visible structures at a few sites showed that the mostimportant and reliable information was the direction of magnetic lineation K1 that determines the direction of a lava flow. The analysis of K1 directions together with radially propagating dikes helped to determine the feeding area along the NW rim of the volcanic complex. One andesite feeder and one rhyodacite feeder were recognized with certainty. In addition, K1 directions pointed to a suspicious area with the presence of another andesite feeder in a caldera-like structure. The evaluation of data strongly suggests that magnetic susceptibility in andesite lavas increases with the distance from the feeder and also with the distance towards the upper part of the andesitic lava flow. We suggest that this might be related to the degree of oxidation of the lava flow before solidification as a reaction with oxygen in the atmosphere. Oxygen can react with FeO in the andesite melt, which consequently results in the formation of magnetite.

Název v anglickém jazyce

Reconstruction of ancient volcanic complexes using magnetic signature: A case study from Cambrian andesite lava flow, Bohemian Massif

Popis výsledku anglicky

Reconstruction of the Upper Cambrian Křivoklát-Rokycany Volcanic Complex was made using anisotropy ofmagnetic susceptibility (AMS). The correlation of AMS with visible structures at a few sites showed that the mostimportant and reliable information was the direction of magnetic lineation K1 that determines the direction of a lava flow. The analysis of K1 directions together with radially propagating dikes helped to determine the feeding area along the NW rim of the volcanic complex. One andesite feeder and one rhyodacite feeder were recognized with certainty. In addition, K1 directions pointed to a suspicious area with the presence of another andesite feeder in a caldera-like structure. The evaluation of data strongly suggests that magnetic susceptibility in andesite lavas increases with the distance from the feeder and also with the distance towards the upper part of the andesitic lava flow. We suggest that this might be related to the degree of oxidation of the lava flow before solidification as a reaction with oxygen in the atmosphere. Oxygen can react with FeO in the andesite melt, which consequently results in the formation of magnetite.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

<a href="/cs/project/GJ19-02177Y" target="_blank" >GJ19-02177Y: Procesy transferu a vmístění magmatu v kolabujících orogenech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

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

1872-6097

Svazek periodika

428

Číslo periodika v rámci svazku

Srpen

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

107591

Kód UT WoS článku

000810117800002

EID výsledku v databázi Scopus

2-s2.0-85131436655