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KRMÍČEK, L. TIMMERMAN, M. J. ZIEMANN, M. A. SUDO, M. ULRYCH, J.
Original Title
(40)A/Ar-39 step-heating dating of phlogopite and kaersutite megacrysts from the Zelezna hurka (Eisenbuhl) Pleistocene scoria cone, Czech Republic
Type
journal article in Web of Science
Language
English
Original Abstract
(40)A/Ar-39 step-heating of mica and amphibole megacrysts from hauyne-bearing olivine melilitite scoria/tephra from the Zelezna hurka yielded a 435 +/- 108 ka isotope correlation age for phlogopite and a more imprecise 1.55 Ma total gas age of the kaersutite megacryst. The amphibole megacrysts may constitute the first, and the younger phlogopite megacrysts the later phase of mafic, hydrous melilitic magma crystallization. It cannot be ruled out that the amphibole megacrysts are petrogenetically unrelated to tephra and phlogopite megacrysts and were derived from mantle xenoliths or disaggregated older, deep crustal pegmatites. This is in line both with the rarity of amphibole at Zelezna hurka and with the observed signs of magmatic resorption at the edges of amphibole crystals.
Keywords
Bohemian Massif; Železná hůrka; Eisenbühl; argon dating; mica; amphibole; melilitite
Authors
KRMÍČEK, L.; TIMMERMAN, M. J.; ZIEMANN, M. A.; SUDO, M.; ULRYCH, J.
Released
15. 8. 2020
Publisher
Earth Science Institute, Slovak Academy of Sciences
Location
Bratislava
ISBN
1335-0552
Periodical
GEOLOGICA CARPATHICA
Year of study
71
Number
4
State
Slovak Republic
Pages from
382
Pages to
387
Pages count
8
URL
http://www.geologicacarpathica.com/browse-journal/volumes/71-4/article-954/
Full text in the Digital Library
http://hdl.handle.net/11012/195623
BibTex
@article{BUT165866, author="Lukáš {Krmíček} and Martin J. {Timmerman} and Martin A. {Ziemann} and Masafumi {Sudo} and Jaromír {Ulrych}", title="(40)A/Ar-39 step-heating dating of phlogopite and kaersutite megacrysts from the Zelezna hurka (Eisenbuhl) Pleistocene scoria cone, Czech Republic", journal="GEOLOGICA CARPATHICA", year="2020", volume="71", number="4", pages="382--387", doi="10.31577/GeolCarp.71.4.6", issn="1335-0552", url="http://www.geologicacarpathica.com/browse-journal/volumes/71-4/article-954/" }