Talc metasomatism of a magnesite body in response to a granite intrusion: Application of Sm–Nd dating of metasomatic dolomite
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F24%3A00582405" target="_blank" >RIV/67985831:_____/24:00582405 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0024493724000331?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0024493724000331?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.lithos.2024.107521" target="_blank" >10.1016/j.lithos.2024.107521</a>
Alternative languages
Result language
angličtina
Original language name
Talc metasomatism of a magnesite body in response to a granite intrusion: Application of Sm–Nd dating of metasomatic dolomite
Original language description
The deposit Gemerská Poloma is located in the Gemeric Superunit of the Western Carpathians and it is currently mined for talc. Talc formed by metasomatic replacement of magnesite, together with dolomite, quartz, pyrite, and accessory minerals. Leachates of dolomite samples in 2.5 M acetic acid yield a Smsingle bondNd isochron age of 271 ± 7 Ma. This age coincides with the previously published ages of the underlying, evolved granitic rocks (from 265 ± 17 to 257 ± 5 Ma, U–Th–Pb on monazite) and the Usingle bondPb age of uraninite (264 ± 1 Ma) interpreted to form from fluids expelled during granite crystallization. The relationship of metasomatism and the granites is further supported by: (i) increased Li and F concentrations in the leachates from dolomite (when compared to the primary magnesite), (ii) increased total REE concentrations in dolomite (compared to magnesite) and even presence of individual REE minerals (bastnäsite) in the ore body, (iii) chondritic Y/Ho ratios, compatible with a magmatic source, (iv) the presence of skarn bodies directly above the magnesite-talc ore deposit, and (v) previously inferred low pressure of talc metasomatism, typical for contact metamorphism in shallow crustal levels. The positive europium anomalies argue for the metasomatism by the action of high-temperature (> 250 °C) hydrothermal fluids that progressively cooled below 250 °C. Thus, the observed talc metasomatism was triggered by the intrusion of the Permian granitic rocks. The Alpine processes tectonically modified the ore body, caused recrystallization and folding of the pre-existing talc and formation of new talc, and obliterated much of the evidence of the earlier processes.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Lithos
ISSN
0024-4937
e-ISSN
1872-6143
Volume of the periodical
470-471
Issue of the periodical within the volume
April
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
12
Pages from-to
107521
UT code for WoS article
001177704800001
EID of the result in the Scopus database
2-s2.0-85183985425