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- Their source is the Archean Group. 它们皆为S型,其源岩为太古界。
- 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。
- At this period, depositional formations have a distinct style from those in the Archean. 中文摘要 太古宙向元古宙的转变,宣告地球历史进入了一个新的重要阶段。
- Metamorphic and Tectonic Evolution of the Archean Granulite Belt of MT.Daqingshan and Gold Mineralization, Inner Mongolia, Chi II. 内蒙古大青山太古宙麻粒岩带的变质构造演化及金的成矿2。
- Gold mineralization of these two deposits occurs within the Archean metamophic rocks of Sanggan Group and Hercynian alkaline complex , respectively. 小营盘金矿产于太古宇桑干群变质岩中,东坪金矿产于海西期碱性杂岩体中。
- These siliciclastic rocks were derived mainly from the Archean and minor from Paleoproterozoic in the southern margin of the North China craton. 源岩以太古宙地层为主,可能有古元古代地层的加入,经历了中等程度的风化作用,并快速堆积形成的。
- Conglomerate of the Middle Proterozoic Tietonggou Formation is in unconformity relation with the plagioclase schist of the Archean Taihua Group. 中元古界铁铜沟组砾岩,砾石形态多样,与下面的太古界太华群斜长片岩呈角度不整合接触。
- The petrography and lithogeochemical characteristics of the Archean metamorphic plutonic intrusive of the Helong area, Jilin province are discussed in this paper. 本文论述了和龙地区太古宙变质深成侵入体的岩石学、岩石化学、地球化学特征。
- The Archean metamorphic rocks are composed of extrusive rocks and metamorphosed plutonic rocks.The former usually exists as inclusions of various size in the latter. 太古代变质岩系由表壳岩和变质深成岩(岩系)组成,前者往往呈规模不等的包体散布在变质深成岩中。
- The wind whirled the dead leaves about. 风吹得枯叶在四处回旋。
- The wind was whispering in the trees. 一阵风穿过树林沙沙作响。
- The Archean Group sedimentary metamorphic iron ore to the north and north-east of Tangshan lies shallow in the earth, is large in scalc and easy to grind and process. 唐山北部和东北部太古界沉积变质铁矿埋藏浅、规模大、矿石易磨易选。
- There are 26 letters in the English alphabet. 英语字母表中有26个字母。
- Foreign nationals were asked to leave the country. 外国侨民被要求离开该国。
- The Archean Sanukites outside of China have been well documented in the range of 3. 0- 2. 5 Ga with the youngest (2.51- 2. 55Ga) occurring in the Dharwar Craton of India. 国外报道的太古代sanukite出现在3.;0-25Ga之间;最晚的为印度Dharv(?) ar克拉通的sanukites(2
- A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
- A country must have the will to repel any invader. 一个国家得有决心击退任何入侵者。
- Gold mineralization in the study area is hosted in continental volcanic rocks of Middle Proterozoic, Xionger Group overlying the Archean crystalline basement. 本区金矿化产于太古界结晶基底之上的中元古界熊耳群陆相火山岩中。
- Swimming is the best way to tone up your body. 游泳是健体强身的最好方法。
- A fire was burning in the grate. 火在壁炉中燃烧着。