查询词典 Proterozoic

At western segment of Altyn Tagh tectonic belt, The eclogites and khondalite series were recognized in Altyn Group (Early Proterozoic?) Which had been thought prviously that it consists of high greenschist facies and lower amphibolitic facies metamorphic rocks. They crop out at the northern slope and southern slope of Altyn Tagh Mountains respectively.

在阿尔金构造带西段，在原认为主要由高绿片岩相—低角闪岩相的阿尔金群中，发现有榴辉岩及麻粒岩相的孔兹岩系，它们分别分布在阿尔金山的北坡和南坡。

Within the belt ,the mid-late Proterozoic green-schists were ovethrust from south to north onto the late Paleozoic granitic batholith at a low angle.

中晚元古代浅变质的绿片岩系自南向北以低角度辗掩于晚古生代花岗岩基之上。

The giant Bayan Obo REE-Nb-Fe deposit is the world's largest REE deposit,which is hosted mainly by Middle Proterozoic Na-rich rocks,dolomitic rock and K-rich slate.

白云鄂博稀土-铌-铁矿是世界最大的稀土多金属矿床之一，主要产于中元古界富钠岩石、白云岩和富钾板岩中。

The magmatic activity of collision granites provides the information about the tectonic dynamics from the continental margin epicontinental of the south of Erguna block in the Neo-proterozoic to Early Cambrian.

碰撞型花岗岩的岩浆活动提供了该区新元古代－早寒武世额尔古纳地块南部大陆边缘陆缘增生的构造动力学信息。

The Middle Proterozoic Caiziyuan peridotite was formed in the epicontinental basin at the ocean-land boundary or within-continent rift basin. Its mantle source could be metasomatized by the dehydration fluid of subducted plate, and much initial radioactive 〓Nd was added to the source.

中元古代菜子园橄榄岩形成于洋陆交界的陆缘盆地或与大洋相连的陆内裂陷盆地，其源区可能受到俯冲板块脱水流体的交代作用，有大量初始放射性〓Nd加入。

There are two kind of zicons in amphibolite from the Haiyangsuo area,eastern Shandong Province:(1)Xenocrysts,they give 207Pb/208Pb age of 2149Ma,which suggests an early proterozoic basement in this area;(2)Magmatic euhedral zircons,they give an upper intercept age of 1784±11Ma and lower intercept age of 448±13Ma.

中文摘要：胶东海阳所胶南群斜长角闪岩中的锆石有2类：（1）捕掳晶锆石，它给出2149Ma 的207Pb/206Pb 年龄，证明该区存在有早元古基底；（2）岩浆结晶锆石，它的不一致线上下交点年龄分别为1784±11Ma和448±13Ma。

Precambrian time is now divided into three eons: Hadean, from the earth ' s origin to about 3900 Ma; Archaean, 3900-2390Ma; and Proterozoic, 2390-570 Ma (the Cambrian marks the start of the Phanerozoic eon, which extends to the present day).

现在将前寒武纪分为三个时代；冥古代，从地球诞生到约39亿年前；太古代，39亿年前—23.9亿年前，以及原生代，23.9亿年前—5.7亿年前（寒武纪标志显生代的开始，延续至今）。

According to field investigation, the Yingfeng rapakivi granite is formed in mid-Proterozoic and located between shear belts as a lentiform in the structural belt of north margin of Qaidam basin.

野外调查表明，鹰峰环斑花岗岩体形成于中元古代，位于柴北缘构造带，呈透镜状夹持在剪切带间。

Boron deposits of eastern Liaoning occur in a suite of Early Proterozoic metamorphic rocks, with boron orebodies existent in magnesian marble.

辽东硼矿床产于早元古代的一套变质岩内，硼矿体赋存于镁质大理岩中。

All of these charac-teristics are similar to those of continental crust transformation series granite in South China,implying that their parent magma may be derived from the unexposed Proterozoic metasedimentary rocks.

这些特征都相似于华南陆壳改造系列花岗岩，它们的母岩浆可能来源于

The two-acre Dunbar Community Garden in Little Rock has served as a model for several years.

几年来，坐落于小石城，占地两英亩的邓巴社区菜园树立了一个标杆。

Jerry points to the jacket hanging in the bathroom. It's ruined, and unwearable What?

杰瑞指着洗手间里挂着的夹克，毁了，不能穿了）什么？