Formation doubly terminated crystals of quartz in Carboniferous limestones from the Brañes site in northwestern Spain
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00094862%3A_____%2F25%3A10004965" target="_blank" >RIV/00094862:_____/25:10004965 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/25:00143625 RIV/00025798:_____/25:10169836
Result on the web
<a href="https://journals.muni.cz/gvms/article/view/41172/34778" target="_blank" >https://journals.muni.cz/gvms/article/view/41172/34778</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5817/GVMS2025-41172" target="_blank" >10.5817/GVMS2025-41172</a>
Alternative languages
Result language
angličtina
Original language name
Formation doubly terminated crystals of quartz in Carboniferous limestones from the Brañes site in northwestern Spain
Original language description
The Carboniferous limestones from the Brañes site in northwestern Spain contain dark, often doubly terminated authigenic quartz crystals. Optical microscopy and fluid inclusion studies of quartz crystals provide insights into the formation and thermal history of the surrounding limestones. The core of quartz crystals has been formed by filling voids created through the dissolution of sulphate. The morphology of the quartz crystals supports this interpretation. The primary and pseudosecondary fluid inclusions within external zones in these quartz crystals are mostly two-phase, consisting of aqueous liquid and a vapor bubble. Cryometric measurements show an initial melting temperature (Tfm) of approximately MINUS SIGN 50 oC, with melting temperatures (Tmice) ranging from - 18.1 oC to - 21.8 oC and - 42.4 oC to - 45.0 oC,orespectively. These melting temperatures indicate high salinity, estimated between 20 wt. % and 29 wt. % CaCl2 equivalent. The homogenization temperatures of the fluid inclusions range from 60 oC to 147 oC, and suggest that the external zones of the quartz crystals were formed during peak temperature conditions of diagenesis in the Early Permian period.
Czech name
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Czech description
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Classification
Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS 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
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geologické výzkumy na Moravě a ve Slezsku
ISSN
1212-6209
e-ISSN
2336-4378
Volume of the periodical
2025
Issue of the periodical within the volume
32
Country of publishing house
CZ - CZECH REPUBLIC
Number of pages
8
Pages from-to
62-69
UT code for WoS article
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EID of the result in the Scopus database
2-s2.0-105028854260