Fingerprints of magma mingling processes within the Miocene Zebin tuff cone feeding system (Jicin Volcanic Field, Czech Republic)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10369661" target="_blank" >RIV/00216208:11310/17:10369661 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/17:00000210

Výsledek na webu

<a href="http://dx.doi.org/10.3190/jgeosci.245" target="_blank" >http://dx.doi.org/10.3190/jgeosci.245</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.245" target="_blank" >10.3190/jgeosci.245</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fingerprints of magma mingling processes within the Miocene Zebin tuff cone feeding system (Jicin Volcanic Field, Czech Republic)

Popis výsledku v původním jazyce

A well-preserved set of partly eroded mid-Miocene scoria cones and tuff cones are exposed in the Jicin Volcanic Field, Czech Republic. Zebin Hill, a formerly quarried tuff cone with an exposed conduit and associated dikes, offers an opportunity to study magmatic processes within the high-level feeding system of a small monogenetic volcano. Two types of dikes and associated &quot;blob-like&quot; intrusions were observed. Pure basanite dikes predominate in the center of the cone, whereas its peripheries were intruded by mingled dikes. The mingled dikes consist of mm-scale basanitic domains enclosed in a network of trachyandesitic dikelets. Locally, hybrid domains with intermediate characteristics were observed. The basanite dikes and basanite enclaves within mingled dikes contain normally-zoned minerals (Fo(90) to Fo(70) olivine, Mg-rich to Mg-poor diopside, labradorite to andesine composition of plagioclase) indicative of basanite magma evolution during ascent. In contrast, the trachyandesite and hybrid enclaves in mingled dikes show reverse zoning of minerals (Mg-poor to Mg-rich diopside, sanidine to oligoclase feldspar composition) indicative of magma hybridization. This study suggests that the Zebin Volcano did not develop from a simple monogenetic system and through a single central axis feeder; rather, Zebin Hill evolved from a complex magma feeding/storage system and through a complex feeder network. We conclude that the simple external structure of a monogenetic volcano may sometimes hide rather complex magmatic plumbing systems encompassing compositionally contrasting rocks/magmas.

Název v anglickém jazyce

Fingerprints of magma mingling processes within the Miocene Zebin tuff cone feeding system (Jicin Volcanic Field, Czech Republic)

Popis výsledku anglicky

A well-preserved set of partly eroded mid-Miocene scoria cones and tuff cones are exposed in the Jicin Volcanic Field, Czech Republic. Zebin Hill, a formerly quarried tuff cone with an exposed conduit and associated dikes, offers an opportunity to study magmatic processes within the high-level feeding system of a small monogenetic volcano. Two types of dikes and associated &quot;blob-like&quot; intrusions were observed. Pure basanite dikes predominate in the center of the cone, whereas its peripheries were intruded by mingled dikes. The mingled dikes consist of mm-scale basanitic domains enclosed in a network of trachyandesitic dikelets. Locally, hybrid domains with intermediate characteristics were observed. The basanite dikes and basanite enclaves within mingled dikes contain normally-zoned minerals (Fo(90) to Fo(70) olivine, Mg-rich to Mg-poor diopside, labradorite to andesine composition of plagioclase) indicative of basanite magma evolution during ascent. In contrast, the trachyandesite and hybrid enclaves in mingled dikes show reverse zoning of minerals (Mg-poor to Mg-rich diopside, sanidine to oligoclase feldspar composition) indicative of magma hybridization. This study suggests that the Zebin Volcano did not develop from a simple monogenetic system and through a single central axis feeder; rather, Zebin Hill evolved from a complex magma feeding/storage system and through a complex feeder network. We conclude that the simple external structure of a monogenetic volcano may sometimes hide rather complex magmatic plumbing systems encompassing compositionally contrasting rocks/magmas.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GAP210%2F12%2F1990" target="_blank" >GAP210/12/1990: Kontinentální litosféra jako zdroj diferencovaných alkalických láv a genetická role bazických magmat vymezení pomocí vulkanismu oherského příkopu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

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

62

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

15

Strana od-do

215-229

Kód UT WoS článku

000423277800001

EID výsledku v databázi Scopus

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