Archean

Their source is the Archean Group.

它們皆為S型,其源巖為太古界.

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Felsic gneiss is the most widely distributed rock type in Archean metamorphic complex areas.

長英質片麻巖是太古宙變質雜巖區最主要的巖石類型.

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It's 100 % pure natural and is extracted from an archean plant -- Ginkgo Bibloba Tree.

100%純天然,提取自太古代望族植物 公孫 樹.

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The Hongtoushan copper - zinc deposit was formed in submarine volcanic eruptions - sedimentary environment in Archean intracratonic rift trough.

紅透山式銅 - 鋅礦床形成于太古代克拉通裂谷槽盆中海底火山噴發 - 沉積環境.

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It is much more complex and difficult to study Archean stratigraphy than Phanerozoic stratigra - phy.

太古宙地層與顯生宙地層相比,具有很大的復雜性,研究難度大.

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The redelimited Jiapigou gold - concentrated area is composed of Archean granitoid - greenstone belts and high grade metamorphism areas.

重新界定的夾皮溝金礦集中區包括了太古宙花崗 - 綠巖帶和高級變質區兩個組成部分.

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Such low levels of sulfate indicate that the Archean atmosphere was virtually devoid of oxygen.

如此低的硫酸鹽濃度,表示太古代大氣中的氧氣極為稀薄.

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Various geochronometric methods have been applied to dating of important geologic events in complex Archean terranes.

在復雜的太古代地體的重要地質事件定年中已采用了多種地質年齡測定方法.

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