metasomatism
Concise Oxford English Dictionary © 2008 Oxford University Press:
metasomatism /ˌmɛtəˈsəʊmətɪz(ə)m/
▶noun Geology change in the chemical composition of a rock.
– derivatives
metasomatic adjective,
metasomatize (or metasomatise) verb.
metasomatic adjective,
metasomatize (or metasomatise) verb.
'metasomatism' also found in these Oxford entries:

