| 释义 |
Definition of picrite in English: picritenoun ˈpɪkrʌɪtˈpikrīt mass nounGeology A dark basaltic igneous rock rich in olivine. Example sentencesExamples - The tholeiitic picrite basalts and basalts of the Mailaka sector have higher 87 Sr / 86 Sr and lower cNd 88 than the weakly alkaline basalts.
- Two series of igneous rocks have been found: tholeiitic, ranging from picrite basalt to basaltic andesite (to rhyodacites); mildly alkaline, with a more restricted compositional range (picrite basalts and basalts).
- It was more voluminous and ranged petrologically from basalts to picrites, showing very little evidence of continental contamination.
- The effects of depth and degree of melting are well illustrated by terrestrial basaltic magma types, which can be divided into three broad groups: basalts, komatiites, and picrites.
- Wholerock and chromite geochemistry suggests that these rocks have greatest affinity with picrites found on King Island, which have a latest Neoproterozoic age.
Derivatives adjectivepɪˈkrɪtɪk Geology The picritic lavas and cumulates drilled in westernmost Victoria are compositionally very similar, with low TiO 2. Example sentencesExamples - Farther east, the abundance of rift tholeiites and associated high-temperature picritic lavas suggests proximity to break-up and formation as part of a Neoproterozoic SDRS package.
- Although partial melting of lherzolitic mantle can produce a range of basaltic magmas, it is also the case that basalts may be the end products of fractional crystallisation of primary picritic magmas.
- Cretaceous and lower Palaeocene sediments partly covered by Palaeocene-Eocene picritic and basaltic lavas are exposed in the Nuussuaq Basin on the island of Disko and the peninsulas of Nuussuaq and Svartenhuk.
- The nephelinites are conformably overlain by picrites and picritic basalts of the Letaba Formation, although in the southern Lebombo the picrites directly overlie the Clarens Formation.
Origin Early 19th century: from Greek pikros 'bitter' + -ite1. Definition of picrite in US English: picritenounˈpikrīt Geology A dark basaltic rock rich in olivine. Example sentencesExamples - It was more voluminous and ranged petrologically from basalts to picrites, showing very little evidence of continental contamination.
- Wholerock and chromite geochemistry suggests that these rocks have greatest affinity with picrites found on King Island, which have a latest Neoproterozoic age.
- The tholeiitic picrite basalts and basalts of the Mailaka sector have higher 87 Sr / 86 Sr and lower cNd 88 than the weakly alkaline basalts.
- The effects of depth and degree of melting are well illustrated by terrestrial basaltic magma types, which can be divided into three broad groups: basalts, komatiites, and picrites.
- Two series of igneous rocks have been found: tholeiitic, ranging from picrite basalt to basaltic andesite (to rhyodacites); mildly alkaline, with a more restricted compositional range (picrite basalts and basalts).
Origin Early 19th century: from Greek pikros ‘bitter’ + -ite. |