Datowanie apatytów z żył kwarcowo-chlorytowo-apatytowych w fyllitach z Podmąchocic (Góry Świętokrzyskie)

• Autorzy: Salwa Sylwester , Szopa Krzysztof

Identyfikatory

DOI

10.7306/2023.28

Warianty tytułu

EN

Dating of apatites from the quartz-chlorite-apatite veins in phyllites from Podmąchocice (Holy Cross Mountains)

• Języki publikacji: PL

Abstrakty

EN

Metamorphic rocks of greenstone facies (phyllites) have been discovered quite recently in the Łysogóry region of the Holy Cross Mountains. The following minerals predominate in the mineral composition of these rocks: bright mica (sericite), quartz, chlorites, rutile, pyrophyllite, xenotime, pyrite, tourmaline, apatite and monacite, while chalcopyrite, sphalerite and galena are also present in mineral veins. The phyllites from Podmąchocice are intensely tectonically deformed, while their metamorphism displays a syndeformation character. The age of the tectonic-metamorphic processes has been initially estimated based on their relation to the silicification process. The phyllites are cut by numerous hydrothermal mineral veins, including quartz-chlorite-apatite ones. These veins occur as small post-tectonic and syntaxial forms, a few centimetres long and up to 1 cm thick. In the central parts of the veins, apatite forms colourless crystals, up to 1 mm long and up to 0.1mm thick. The age of the apatites was determined by means of the laser ablation system combined with the mass spectrometer. The results of isotopic measurements were reduced using the “Vizual Age” reduction program. The U-Pb age has been estimated to ~389 ± 18 Ma (upper intercept) that points to the maximum Devonian age (Eifelian/Givetian) of formation of the quartz-apatite veins. This is the first dating that point sto hydro thermal activity of th is age in the study area. As the veins cut discordantly the metamorphic rocks, the metamorphism itself may be older than the apatite age.

Słowa kluczowe

PL

apatyt; żyły hydrotermalne; metamorfizm; Góry Świętokrzyskie

EN

apatite; hydrothermal veins; metamorphism; Holy Cross Mountains

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2023
• Tom: Vol. 71, nr 5
• Strony: 298--300
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Salwa Sylwester

• Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy, Oddział Świętokrzyski, ul. Zgoda 21, 25–953 Kielce

• https://orcid.org/0000-0001-6364-2842

autor

Szopa Krzysztof

• Instytut Nauk o Ziemi, Wydział Nauk Przyrodniczych, Uniwersytet Śląski w Katowicach, ul. Będzińska 60, 41–200 Sosnowiec

• https://orcid.org/0000-0002-7588-7836

Bibliografia

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• 2. DADLEZ R., KOWALCZEWSKI Z., ZNOSKO J. 1994 - Some key problems of the pre-Permian tectonics of Poland. Geol. Quart., 38 (2): 169-189.
• 3. KOWALCZEWSKI Z. 1975 - Tektonika i tektogeneza paleozoiku i mezozoiku. Gór Świętokrzyskich. Studium strukturalne Pasma Masłowskiego i Klonowskiego. Arch. PIG-PIB, Kielce.
• 4. KOWALCZEWSKI Z., DADLEZ R. 1996 - Tectonics of the Cambrian in the Wisniówka area (Holy Cross Mts., Central Poland).Geol.Quart.,40(1):23-46.
• 5. MALEC J. 2001 - Sedimentology of deposits from around the Late Caledonian unconformity in the western Holy Cross Mts. Geol. Quart., 45 (4): 397-415.
• 6. SALWA S. 2006 - Wstępna charakterystyka strukturalno-petrograficzna fyllitów z Podmąchocic w regionie łysogórskim Gór Świętokrzyskich. Prz. Geol., 54: 513-520.
• 7. SALWA S. 2015 - Quartz-apatite veins in metamorphic rocks of the Holy Cross Mountains. Mineralogia, Sp. Pap., 44: 99.
• 8. PETRUS J.A, KAMBER B.S. 2012 - VizualAge: A Novel Approach to Laser Ablation ICP-MS U-Pb Geochronology Data Reduction. Geostand. Geoanalyt. Res., 36: 247-270.