Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.
在前寒武紀(jì)的最后1億年中，兩個(gè)主要的冰川時(shí)期對(duì)兩個(gè)地區(qū)都產(chǎn)生了影響。
柯林斯例句
Gneiss, a metamorphic rock, can be commonly found in Precambrian areas.
片麻巖, 變質(zhì)巖, 可以發(fā)現(xiàn),在常見的前寒武紀(jì)地區(qū).
互聯(lián)網(wǎng)
Precambrian time for as much as eighty - five percent of all geological time.
從前寒 武 世紀(jì)以來地球地面大部分被冰川所覆蓋的任何地質(zhì)年代.
互聯(lián)網(wǎng)
Early - Precambrian rocks are widely exposed in Dunhuang - Beishan area, GansuProvince.
甘肅敦煌 - 北山地區(qū)廣泛出露早前寒武紀(jì)巖石.
互聯(lián)網(wǎng)
Rapakivi is a special rock in Precambrian.
環(huán)斑花崗巖是發(fā)育于前寒武紀(jì)的一種特殊巖石.
互聯(lián)網(wǎng)
Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton.
華北克拉通中部廣泛發(fā)育晚前寒武紀(jì)鎂鐵質(zhì)巖墻群.
互聯(lián)網(wǎng)
Of , belonging to, or designating the earlier of two divisions of the Precambrian era.
(地質(zhì)學(xué))在前寒武紀(jì)后半部分形成的.
互聯(lián)網(wǎng)
Precambrian time accounts for as much as eighty - five percent of all geological time.
前寒武紀(jì)占據(jù)了整個(gè)地質(zhì)年代的百分之85.
互聯(lián)網(wǎng)
They are in fact metamorphosed rocks , predominantly schist , amphibolites, granites and sand stones and Muruwa Precambrian.
事實(shí)上,它們主要由地片巖、閃巖 、 花崗巖和細(xì)沙,小石頭變質(zhì)而來.
互聯(lián)網(wǎng)
Among them the Precambrian and Cenozoic eras are the main metallogenic epoches in the world.
就全球而言,前寒武紀(jì)和新生代是金礦的重要成礦期.
互聯(lián)網(wǎng)
They are controlled by shear fracture belt of epimetamorphic rock series of Precambrian Period.
主要賦存于前寒武紀(jì)淺變質(zhì)巖系中,受剪切斷裂帶控制.
互聯(lián)網(wǎng)
The oldest rocks in the concession area belong to the Guyana and are of Precambrian age.
最古老的巖石層在圭亞那雨林,它們的年齡可以追述到前寒武紀(jì).
互聯(lián)網(wǎng)
In the world a lot of gold deposits occur in the early Precambrian greenstone belts.
早前寒武紀(jì)花崗巖—綠巖地體中賦存著豐富的金礦床.我國綠巖帶主要分布在華北陸臺(tái),也是重要的含金巖系.
互聯(lián)網(wǎng)