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(zhǎng)英質(zhì)片麻巖是太古宙變質(zhì)雜巖區(qū)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(fā) - 沉積環(huán)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(fù)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(qū)包括了太古宙花崗 - 綠巖帶和高級(jí)變質(zhì)區(qū)兩個(gè)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(fù)雜的太古代地體的重要地質(zhì)事件定年中已采用了多種地質(zhì)年齡測(cè)定方法.
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