40Ar/39Ar step-heating dating of phlogopite and kaersutite megacrysts from the Železná hůrka (Eisenbühl) Pleistocene scoria cone, Czech Republic
- (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.
| Author details: | Lukáš KrmíčekORCiDGND, Martin Jan TimmermanORCiD, Martin Andreas ZiemannGND, Masafumi SudoORCiDGND, Jaromir Ulrych |
|---|---|
| DOI: | https://doi.org/10.31577/GeolCarp.71.4.6 |
| ISSN: | 1335-0552 |
| ISSN: | 1336-8052 |
| Title of parent work (English): | Geologica Carpathica |
| Publisher: | Veda |
| Place of publishing: | Bratislava |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2020/08/01 |
| Publication year: | 2020 |
| Release date: | 2023/10/04 |
| Tag: | Bohemian Massif; Eisenbuhl; Zelezna hurka; amphibole; argon dating; melilitite; mica |
| Volume: | 71 |
| Issue: | 4 |
| Number of pages: | 8 |
| First page: | 382 |
| Last Page: | 387 |
| Funding institution: | Institute of Geology of the CAS [RVO 67985831]; BUT project "AdMaS UP; -Advanced Materials, Structures and Technologies" [LO1408]; Ministry of; Education, Youth and Sports under the "National Sustainability Programme; I" |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
| Peer review: | Referiert |
| Publishing method: | Open Access / Gold Open-Access |
| DOAJ gelistet |
