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词汇 metasomatism
释义

Definition of metasomatism in English:

metasomatism

noun ˌmɛtəˈsəʊmətɪz(ə)mˌmedəˈsōməˌtizəm
mass nounGeology
  • Change in the composition of a rock as a result of the introduction or removal of chemical constituents.

    〔地质〕交代作用,交代变质(作用)

    Example sentencesExamples
    • Textural relationships and geological context need to be determined to distinguish these burial-related phases from monazites ascribed to granite metasomatism or low-grade metamorphism.
    • Many experiments suggest that ancient subduction-related metasomatism affected OIB mantle sources long before island magmatism.
    • Much more commonly, however, metasomatism involves chemical exchange with fluids; in the earth's crust these fluids are usually aqueous solutions.
    • In many cases, quartz overgrowths were preferentially corroded and dissolved in the presence of pyrophyllite, most likely during acidic metasomatism.
    • In the cooler middle and upper crust, felsic magmatism and aqueous metasomatism are most important.

Derivatives

  • metasomatic

  • adjective ˌmɛtəsəʊˈmɑtɪk
    Geology
    • Dolerite dykes that cut the peridotite show chilled margins and local metasomatic calcic alteration.
      Example sentencesExamples
      • Specifically, gangue formed by both metasomatic alteration and precipitation during ore formation can yield a wealth of information about the origins and physical conditions of the ore-forming fluids.
      • A metasomatic deposit was formed at the contact of volcanic intrusive rocks and the limestones.
      • Aplite and pegmatite sills and dykes are also common demonstrating that a metasomatic volatile-rich phase played an important role in leucogranite migration.
      • Jadeite dykes are intruded within serpentinites and are the metasomatic products of crystallization from hydrous fluids reacting with the serpentinites.
  • metasomatize

  • verb ˌmɛtəˈsəʊmətʌɪzˌmɛdəˈsoʊməˌtaɪz
    [with object]Geology
    • Change the composition of (a rock) by the introduction or removal of chemical constituents.

      〔地质〕交代作用,交代变质(作用)

      hot fluids from the magma chamber metasomatized the volcanic lavas
      Example sentencesExamples
      • When metamorphism is accompanied by a change in the chemistry of a rock, the rock is said to have been metasomatized.
      • Most recent studies of potassic magma generation ascribe such characteristics to metasomatized portions of the subcontinental lithosphere.
      • These fluids altered and metasomatized the previously emplaced volcanic products (lavas, pyroclasts).

Origin

Late 19th century: from meta- (expressing change) + Greek sōma, somat- 'body' + -ism.

Definition of metasomatism in US English:

metasomatism

nounˌmedəˈsōməˌtizəm
Geology
  • Change in the composition of a rock as a result of the introduction or removal of chemical constituents.

    〔地质〕交代作用,交代变质(作用)

    Example sentencesExamples
    • In the cooler middle and upper crust, felsic magmatism and aqueous metasomatism are most important.
    • Much more commonly, however, metasomatism involves chemical exchange with fluids; in the earth's crust these fluids are usually aqueous solutions.
    • In many cases, quartz overgrowths were preferentially corroded and dissolved in the presence of pyrophyllite, most likely during acidic metasomatism.
    • Textural relationships and geological context need to be determined to distinguish these burial-related phases from monazites ascribed to granite metasomatism or low-grade metamorphism.
    • Many experiments suggest that ancient subduction-related metasomatism affected OIB mantle sources long before island magmatism.

Origin

Late 19th century: from meta- (expressing change) + Greek sōma, somat- ‘body’ + -ism.

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