Autometamorphism
Definition
A geological process of mineralogical transformation and alteration of an igneous rock, caused in the final stages of its consolidation by its own residual gases, water vapor, and hydrothermal solutions released during magma cooling. This phenomenon transforms unstable primary minerals into new secondary assemblages (such as serpentinization or chloritization of basalts) without the input of external tectonic pressures or temperatures.
Bilingual Equivalents
- Autometamorphism
- Deuteric alteration
Grammatical & Source Details
| Inflection Type | Neuter noun, taking regular plural structural forms ending in '-isme'. |
| Formation | Compound structure built from the prefixoid 'auto-' and the noun 'metamorfism' (metamorphism). |
| Spelling / Pronunciation | [a.u.to.me.ta.mor.ˈfism] |
| Source | Encyclopedia of Advanced Igneous Petrology, Hydrothermal Geochemistry, and Volcanic Formations |
Contextual Usage Examples
RO: Acest masiv de olivină prezintă urme clare de autometamorfism, fiind parțial transformat în serpentinit.
EN: This olivine massif shows clear traces of autometamorphism, being partially transformed into serpentinite.
RO: Procesul de autometamorfism se produce la temperaturi ridicate, imediat după solidificarea topiturii de silicați.
EN: The autometamorphism process occurs at elevated temperatures, immediately following the solidification of the silicate melt.
RO: Studiul microscopic a relevat prezența mineralelor hidratate formate prin autometamorfism în miezul rocii granidice.
EN: The microscopic study revealed the presence of hydrated minerals formed via autometamorphism within the core of the granitic rock.
Idioms & Phrases
Autometamorfism izochimic / Isochemical autometamorphism
RO: Transformare mineralogică internă care se produce fără modificarea compoziției chimice globale a rocii magmatice.
EN: An internal mineralogical transformation occurring without altering the bulk chemical composition of the igneous rock.
Fază de autometamorfism / Autometamorphic stage / deuteric phase
RO: Etapă finală din evoluția unui corp intruziv în care fluidele volatile interstițiale reacționează cu cristalele formate anterior.
EN: A final stage in the evolution of an intrusive body where volatile interstitial fluids react with previously formed crystals.
Efect de autometamorfism / Autometamorphic effect / late-magmatic outcome
RO: Schimbare texturală și minerală vizibilă la microscop prin înlocuirea feldspaților cu mice sub acțiunea vaporilor acizi proprii.
EN: A textural and mineral shift visible under the microscope through the replacement of feldspars by micas under the action of own acid vapors.
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