单词	picrite
释义	picrite /ˈpɪkrʌɪt / noun [mass noun] Geology A dark basaltic igneous rock rich in olivine.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). 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. Derivatives picritic /pɪˈkrɪtɪk/ adjective ... 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. 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. The picritic lavas and cumulates drilled in westernmost Victoria are compositionally very similar, with low TiO 2. Origin Early 19th century: from Greek pikros 'bitter' + -ite1.
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