| 词汇 | lamprophyres |
| 释义 | BETA Examples of lamprophyreslamprophyres isn’t in the Cambridge Dictionary yet. You can help! The lamprophyres may be classified as spessartites and minettes on the base of their mineralogy. All these suggest that the lamprophyres were produced from differentiation of a parental magma, coupled with contamination by lower crust. The chemical and isotopic data suggest that the lamprophyres were derived from a metasomatized garnet peridotite. To determine the proportions of crustal components in the source, we need to know the isotopic compositions of the magma that is parental to the lamprophyres. The parental magma was derived from melting of a long-term enriched sub-continental lithospheric mantle source as is indicated by the highly enriched isotopic signatures of the lamprophyres. For others, additional chemical, mineralogic, or textural criteria must be used, as for lamprophyres. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. While modern concepts see orangeites, lamproites and kimberlites as separate, a vast majority of lamprophyres have similar origins to these other rock types. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The clear-cut distinction of the microgranites and the lamprophyres from the other facies argues for the existence or the hybridisation of two separate magmas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Kimberlites, lamproites and perhaps even lamprophyres are known to contain diamond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Signatures of the mantle are found in many large deposits, including melts from metasomatised mantle wedge as well as lamprophyres. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Lamprophyres are also known to be spatially and temporally associated with gold mineralisation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In many lamprophyres the pale quartz and felspathic ingredients tend to occur in rounded spots, or ocelli, in which there has been progressive crystallization from the margins towards the center. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Lamprophyres occur throughout all geologic eras. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Basalts, kimberlites, lamproites and lamprophyres, which have their source in the upper mantle, often contain fragments and crystals assumed to be a part of the originating mantle mineralogy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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