metasomatism: meaning, definition, pronunciation and examples
C2Technical, Academic (Geology, Petrology, Mineralogy)
Quick answer
What does “metasomatism” mean?
The chemical alteration of a rock by the addition or removal of elements through fluids.
Audio
Pronunciation
Definition
Meaning and Definition
The chemical alteration of a rock by the addition or removal of elements through fluids.
A geological process where the chemical composition of a rock or mineral is significantly changed due to interactions with hydrothermal fluids, often resulting in ore deposits or the formation of new minerals. More broadly, it can be used metaphorically to describe a transformative replacement process in any system.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or spelling. Both use the term identically within technical literature.
Connotations
None beyond the strict geological definition.
Frequency
Extremely low frequency in general discourse. Exclusively used in geological and related earth science contexts in both varieties.
Grammar
How to Use “metasomatism” in a Sentence
The [Rock Formation] underwent metasomatism.Metasomatism of the [Mineral Name] resulted in...[Fluid Type] caused metasomatism along the [Geological Feature].Vocabulary
Collocations
Examples
Examples of “metasomatism” in a Sentence
verb
British English
- The granitic body was metasomatised by late-stage fluids.
- These rocks have clearly been metasomatising over a long period.
American English
- The granite was metasomatized by late-stage fluids.
- These rocks have clearly been metasomatizing over a long period.
adverb
British English
- The rock was metasomatically altered.
- The minerals formed metasomatically.
American English
- The rock was metasomatically altered.
- The minerals formed metasomatically.
adjective
British English
- The metasomatic alteration is clearly visible in thin section.
- They identified a distinct metasomatic zone.
American English
- The metasomatic alteration is clearly visible in thin section.
- They identified a distinct metasomatic zone.
Usage
Meaning in Context
Business
Not used.
Academic
Core technical term in geology and petrology for describing rock-fluid interactions.
Everyday
Virtually never used.
Technical
Essential term for describing processes in ore genesis, metamorphic petrology, and geochemistry.
Vocabulary
Synonyms of “metasomatism”
Strong
Neutral
Weak
Vocabulary
Antonyms of “metasomatism”
Watch out
Common Mistakes When Using “metasomatism”
- Misspelling as 'metasomatosis' (though this is a rare synonym).
- Confusing it with 'metamorphism'.
- Using it outside of a geological/chemical replacement context.
FAQ
Frequently Asked Questions
Metamorphism changes a rock's mineralogy and texture primarily through heat and pressure, largely in a closed chemical system. Metasomatism specifically involves significant chemical exchange with an external fluid, adding or removing elements.
It is a common and geologically important process in specific settings, such as around igneous intrusions, in fault zones, and in areas of hydrothermal activity, often responsible for forming economic mineral deposits.
Sometimes. Effects like colour halos, distinct mineral banding, or the complete replacement of one mineral by another (e.g., serpentinisation) can be visible. However, detailed study usually requires a microscope or chemical analysis.
Rarely. It is occasionally borrowed as a metaphor in fields like materials science or biology to describe a process of transformative replacement, but its primary and almost exclusive domain is geology.
The chemical alteration of a rock by the addition or removal of elements through fluids.
Metasomatism is usually technical, academic (geology, petrology, mineralogy) in register.
Metasomatism: in British English it is pronounced /ˌmɛtəˈsəʊmətɪz(ə)m/, and in American English it is pronounced /ˌmɛdəˈsoʊməˌtɪzəm/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of META-SOAP-ism: imagine a rock being deeply cleaned and its minerals swapped out by a powerful, soapy (hydrothermal) fluid.
Conceptual Metaphor
A geological 'chemical recipe swap' where fluids act as a delivery and removal service for elements.
Practice
Quiz
What is the primary driver of metasomatism?