Their source is the Archean Group.

它们皆为S型,其源岩为太古界.

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

长英质片麻岩是太古宙变质杂岩区最主要的岩石类型.

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

100%纯天然,提取自太古代望族植物 公孙 树.

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

红透山式铜 - 锌矿床形成于太古代克拉通裂谷槽盆中海底火山喷发 - 沉积环境.

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

太古宙地层与显生宙地层相比,具有很大的复杂性,研究难度大.

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

重新界定的夹皮沟金矿集中区包括了太古宙花岗 - 绿岩带和高级变质区两个组成部分.

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

如此低的硫酸盐浓度,表示太古代大气中的氧气极为稀薄.

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

在复杂的太古代地体的重要地质事件定年中已采用了多种地质年龄测定方法.

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