Formation doubly terminated crystals of quartz in Carboniferous limestones from the Brañes site in northwestern Spain

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216224:14310/25:00143625 RIV/00025798:_____/25:10169836

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Formation doubly terminated crystals of quartz in Carboniferous limestones from the Brañes site in northwestern Spain

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Formation doubly terminated crystals of quartz in Carboniferous limestones from the Brañes site in northwestern Spain

Popis výsledku anglicky

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.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geologické výzkumy na Moravě a ve Slezsku

ISSN

1212-6209

e-ISSN

2336-4378

Svazek periodika

2025

Číslo periodika v rámci svazku

32

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

8

Strana od-do

62-69

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-105028854260