Publication detail

(40)A/Ar-39 step-heating dating of phlogopite and kaersutite megacrysts from the Zelezna hurka (Eisenbuhl) Pleistocene scoria cone, Czech Republic

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/"
}