前震旦纪 meaning in English

pre-sinian

It agrees with the fact that the gabbro is intruded by late ordovician granitic pluton . the pre - sinian basement strata exposed in the north kunlun massif are later archean - neoproterozoic milan group , changcheng system kaqiang group , jixian system liushui formation and qingbaikou system sulu formation
被蛇绿岩所分隔的昆北地块上出露的前震旦纪基底地层为：晚太古代-新元古代米兰岩群，长城系卡羌岩群，蓟县系流水岩组和青白口系丝路岩组。
In qinghai province , it reveals that the au deposits are mostly distributed on the sits between different tectonic units ; and in the edge of the exposed and / or concealed metamorphic basement of the early sinian period ; in the area of the exposed and concealed acid - instrusions and / or their contacts ; and in the localities where the circular and linear anomalies of graviation and magnetism cut across
结果表明，该区的金矿大都分布在不同大地构造单元结合部位；处于前震旦纪变质岩系出露及隐伏基底边缘；位于出露和隐伏中酸性岩体及其接触带；位于重磁环线、线线构造交汇处等。