Deciphering the pressure-temperature path in low-grade metamorphic rocks by combining crystal chemistry, thermobarometry and thermodynamic modelling: An example in the Marguareis Massif, Western Ligurian Alps, Italy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169566" target="_blank" >RIV/00025798:_____/25:10169566 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1180/mgm.2024.80" target="_blank" >https://doi.org/10.1180/mgm.2024.80</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2024.80" target="_blank" >10.1180/mgm.2024.80</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Deciphering the pressure-temperature path in low-grade metamorphic rocks by combining crystal chemistry, thermobarometry and thermodynamic modelling: An example in the Marguareis Massif, Western Ligurian Alps, Italy

Popis výsledku v původním jazyce

Unveiling the pressure-temperature path of low-grade metamorphic rocks is challenging because of the occurrence of detrital minerals and high-variance mineral assemblages (i.e. chlorite-white mica-quartz). This paper is an attempt to reconstruct the pressure-temperature history on metapelites from a low-grade metamorphic unit, i.e. the Cabanaira Unit, located in the Marguareis Massif (Western Ligurian Alps, Italy). In order to obtain the most robust result possible, multi-equilibrium thermobarometry, forward modelling and crystallochemical index measurements are used together to reconstruct a pressure-temperature path, with consideration of the strengths and weaknesses of these methods. This multidisciplinary approach allowed us to reconstruct the metamorphic evolution of the unit of interest, characterised by a pressure peak reached under low-temperature conditions (0.85-0.68 GPa and 250-285oC) followed by decompressional warming (low pressure-high temperature, 0.4-0.6 GPa and 300-335oC). This pressure-temperature path is consistent with the tectonic evolution of the investigated area proposed by previous studies, where a geological scenario in which the Cabanaira Unit experienced subduction-related processes was postulated, even if the reasons for warming remain unclear. Multi-equilibrium thermobarometry is considered to be the most suitable method to unravel the metamorphic history of low-grade rocks, whereas forward thermodynamic modelling and the calculation of crystallochemical indexes seem to resolve only some segments of the pressure-temperature path.

Název v anglickém jazyce

Deciphering the pressure-temperature path in low-grade metamorphic rocks by combining crystal chemistry, thermobarometry and thermodynamic modelling: An example in the Marguareis Massif, Western Ligurian Alps, Italy

Popis výsledku anglicky

Unveiling the pressure-temperature path of low-grade metamorphic rocks is challenging because of the occurrence of detrital minerals and high-variance mineral assemblages (i.e. chlorite-white mica-quartz). This paper is an attempt to reconstruct the pressure-temperature history on metapelites from a low-grade metamorphic unit, i.e. the Cabanaira Unit, located in the Marguareis Massif (Western Ligurian Alps, Italy). In order to obtain the most robust result possible, multi-equilibrium thermobarometry, forward modelling and crystallochemical index measurements are used together to reconstruct a pressure-temperature path, with consideration of the strengths and weaknesses of these methods. This multidisciplinary approach allowed us to reconstruct the metamorphic evolution of the unit of interest, characterised by a pressure peak reached under low-temperature conditions (0.85-0.68 GPa and 250-285oC) followed by decompressional warming (low pressure-high temperature, 0.4-0.6 GPa and 300-335oC). This pressure-temperature path is consistent with the tectonic evolution of the investigated area proposed by previous studies, where a geological scenario in which the Cabanaira Unit experienced subduction-related processes was postulated, even if the reasons for warming remain unclear. Multi-equilibrium thermobarometry is considered to be the most suitable method to unravel the metamorphic history of low-grade rocks, whereas forward thermodynamic modelling and the calculation of crystallochemical indexes seem to resolve only some segments of the pressure-temperature path.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

1471-8022

Svazek periodika

89

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

203-224

Kód UT WoS článku

001458991200001

EID výsledku v databázi Scopus

2-s2.0-85209715427