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Definition of micrite in English: micritenoun ˈmɪkrʌɪtˈmīˌkrīt mass nounGeology 1Microcrystalline calcite present in some types of limestone. 〔地质〕微晶，泥晶 Example sentencesExamples - The formation of botryoidal aragonite and clotted micrite was followed by silicification of carbonate phases and precipitation of authigenic quartz.
- They can be separated into three distinct groups of authigenic carbonates, including a first stage with botryoidal aragonite, a second stage of clotted micrite, and a third stage of blocky spar.
- Petrographic study reveals clusters of small grapestone particles, including benthic foraminifera, spines and calcite crystals encrusted by micrite.
- The irregular topography of this bedding surface is covered by a thin veneer of micrite with limonite disseminated throughout.
- This suggests that the micrite grew within pre-existing fine sediment or that clay and carbonate were mixed by intense biological activity.
- 1.1 Limestone consisting chiefly of micrite.
微晶灰岩 Example sentencesExamples - The cortex is made of micrite and is vaguely distinctive from the nucleus by a finely concentric lamination.
- The Middle Member is 57.3 m thick and is mainly composed of gravel-bearing calcarenite, bioclastic limestone, bioclastic micrite, and reef limestone.
- These fades grade upwards into ammonite-rich, bioturbated, interbedded nodular micrite, oncolitic limestone and mudstone which are interpreted as condensed zone deposits.
- The body cavity and accessory cavity are filled with a moderate gray micrite.
- This interpretation appears supported by the predominant occurrence of Platystrophia in soft-weathering micrite and calcareous mudstone.
Derivativesadjective Geology Typically the limestones of the Langport Member are pure, micritic and pale grey; where this lithology is preeminent the unit has been referred to as the White Lias (a term used by William Smith in his table of strata dating from 1799). Example sentencesExamples - Haimacystis occurs on the upper surface of an echinoderm and trilobite skeletal grain-supported intraformational conglomerate about 10 cm thick with rounded, tabular, micritic pebbles.
- The fossils were preserved in 98-99% pure micritic limestone, precipitated on a caliche paleosol that surrounded a shallow Pleistocene lake with swampy marginal zones.
- The Southern Biofacies Belt is characterized by micritic carbonates rich in gymnocodiacean and dasycladacean algae, bellerophontid gastropods, productid brachiopods, and bryzoans to the exclusion of ammonoids.
- The Hamrat Duru rocks include radiolarian cherts, micritic limestones, turbiditic sandstones, shales and calcarenite, all complexly folded and thrust faulted in a 30 km wide fold-thrust belt.
Origin1950s: from micr(ocrystalline) + -ite1. Definition of micrite in US English: micritenounˈmīˌkrīt Geology 1Microcrystalline calcite present in some types of limestone. 〔地质〕微晶，泥晶 Example sentencesExamples - This suggests that the micrite grew within pre-existing fine sediment or that clay and carbonate were mixed by intense biological activity.
- The formation of botryoidal aragonite and clotted micrite was followed by silicification of carbonate phases and precipitation of authigenic quartz.
- The irregular topography of this bedding surface is covered by a thin veneer of micrite with limonite disseminated throughout.
- Petrographic study reveals clusters of small grapestone particles, including benthic foraminifera, spines and calcite crystals encrusted by micrite.
- They can be separated into three distinct groups of authigenic carbonates, including a first stage with botryoidal aragonite, a second stage of clotted micrite, and a third stage of blocky spar.
- 1.1 Limestone consisting chiefly of micrite.
微晶灰岩 Example sentencesExamples - The body cavity and accessory cavity are filled with a moderate gray micrite.
- These fades grade upwards into ammonite-rich, bioturbated, interbedded nodular micrite, oncolitic limestone and mudstone which are interpreted as condensed zone deposits.
- The Middle Member is 57.3 m thick and is mainly composed of gravel-bearing calcarenite, bioclastic limestone, bioclastic micrite, and reef limestone.
- The cortex is made of micrite and is vaguely distinctive from the nucleus by a finely concentric lamination.
- This interpretation appears supported by the predominant occurrence of Platystrophia in soft-weathering micrite and calcareous mudstone.
Origin1950s: from micr(ocrystalline) + -ite. |