Ultrahigh-temperature granites and a curious thermal eye in the post-collisional South Bohemian batholith of the Variscan orogenic belt (Europe)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10456218" target="_blank" >RIV/00216208:11310/22:10456218 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XnkGi4BmI0" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XnkGi4BmI0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1130/G49645.1" target="_blank" >10.1130/G49645.1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ultrahigh-temperature granites and a curious thermal eye in the post-collisional South Bohemian batholith of the Variscan orogenic belt (Europe)

Popis výsledku v původním jazyce

Comprehensive zircon thermometry that takes into account zircon saturation tempera-tures, Ti-in-zircon measurements, and zircon morphologies and microstructures can provide key information on the thermal evolution of a granite batholith. The Variscan South Bohe-mian batholith (Germany, Austria, and Czech Republic) comprises a series of granitoid units that intruded between ca. 330 and ca. 300 Ma. We categorize the granitic rocks according to their emplacement temperature into very low temperature (T) (VLT; 750 °C), low T (LT; 750-800 °C), medium T (MT; 800-850 °C), high T (HT; 850-900 °C), and ultrahigh T (UHT; 900 °C). The first stage of batholith formation (ca. 330-325 Ma) is characterized by LT to MT melting of mainly metasedimentary sources driven by their isothermal exhuma-tion. In turn, ca. 322 Ma HT and UHT granites in the southern half of the batholith reveal an ephemeral thermal anomaly in the subbatholithic crust, which is presumably linked to a hidden mafic intrusion. The HT and UHT granites are weakly peraluminous, high-K, I-type rocks. Although sharing some features with A-type granites such as high Zr and rare earth element contents, they differ from classical A-type granites in being magnesian, not enriched in Ga over Al, and having high Ba and Sr contents. A ring structure of ca. 317 Ma MT and/ or LT plutons is observed around the HT and/or UHT granite complex and interpreted as an aftermath of the hotspot event. This study is an example of how deep-crustal hotspots, presumably caused by mantle magmatism, can significantly enhance the effects of decom-pressional crustal melting in a post-collisional setting.

Název v anglickém jazyce

Ultrahigh-temperature granites and a curious thermal eye in the post-collisional South Bohemian batholith of the Variscan orogenic belt (Europe)

Popis výsledku anglicky

Comprehensive zircon thermometry that takes into account zircon saturation tempera-tures, Ti-in-zircon measurements, and zircon morphologies and microstructures can provide key information on the thermal evolution of a granite batholith. The Variscan South Bohe-mian batholith (Germany, Austria, and Czech Republic) comprises a series of granitoid units that intruded between ca. 330 and ca. 300 Ma. We categorize the granitic rocks according to their emplacement temperature into very low temperature (T) (VLT; 750 °C), low T (LT; 750-800 °C), medium T (MT; 800-850 °C), high T (HT; 850-900 °C), and ultrahigh T (UHT; 900 °C). The first stage of batholith formation (ca. 330-325 Ma) is characterized by LT to MT melting of mainly metasedimentary sources driven by their isothermal exhuma-tion. In turn, ca. 322 Ma HT and UHT granites in the southern half of the batholith reveal an ephemeral thermal anomaly in the subbatholithic crust, which is presumably linked to a hidden mafic intrusion. The HT and UHT granites are weakly peraluminous, high-K, I-type rocks. Although sharing some features with A-type granites such as high Zr and rare earth element contents, they differ from classical A-type granites in being magnesian, not enriched in Ga over Al, and having high Ba and Sr contents. A ring structure of ca. 317 Ma MT and/ or LT plutons is observed around the HT and/or UHT granite complex and interpreted as an aftermath of the hotspot event. This study is an example of how deep-crustal hotspots, presumably caused by mantle magmatism, can significantly enhance the effects of decom-pressional crustal melting in a post-collisional setting.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/8J20AT004" target="_blank" >8J20AT004: Geologická korelace intra-alpských krustálních jednotek s Českým masivem</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>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

Geology

ISSN

0091-7613

e-ISSN

1943-2682

Svazek periodika

50

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

542-546

Kód UT WoS článku

000754842500001

EID výsledku v databázi Scopus

2-s2.0-85129809946