古生代

A Paleozoic microfossil usually having a toothlike shape and considered to be the remains of an extinct marine organism.

牙形刺一种古生代微化石，一般有牙状形体，被认为是一种已灭绝海生生物体的残骸

OGa. The 1863士44Ma U-Pb age of migmatite and 2071士48 Sm-Nd iso- chron age of amphibolite in Sanzhishu demonstrate that at least part of the "Hexi" Group is of Early Proterozoic rather than Late Paleozoic.

三枝树地区"鹤溪群"中混合岩年龄为1863±44Ma，斜长角闪岩全岩矿物Sm－Nd等时线年龄为2071±48Ma，表明景宁三枝树地区变质岩的时代应为早元古代，并非原来所属"鹤溪群"划归的晚古生代，这套变质岩可能是浙闽变质基底的一部分。

According to the research of the paper, the "migmatite" of the Sizishan Formation, Xingdong Group distributed in northern Xiao Hinggan Mountains should be a suit of gneissic quartz monzonitegranite intrusions. Their whole rockmineral Rb-Sr isochronic dating is (482±19) Ma, indicating that an Caledonian magmatic events existed in the giant granitic belt of the Xiao Hinggan Mountains.

研究表明，分布于小兴安岭北部金林林场的兴东群四子山组"混合岩"为一套片麻状石英二长岩-花岗岩侵入体，岩石全岩-矿物Rb-Sr等时线年龄为(482±19) Ma，这表明小兴安岭巨型花岗岩带中存在早古生代岩浆事件。

Nalati tectonic belt located between the Ili Basin and the South Tianshan of western Tianshan is 25 km wide, and it is composed of earlier Proterozoic schist, gneiss, migmatite, and migmatitic granite.

那拉提构造带位于天山西段伊犁盆地与南天山之间，出露宽度约 2 5 km，由早元古代片岩、片麻岩及混合岩、混合花岗岩组成；深层次韧性剪切带及叠加中-浅层次剪切带发育；那拉提构造带南缘断裂明显，南侧为古生代浅变质黑色岩系；构造带北缘韧/脆性剪切带宽度大，两侧岩石劈理化后易于混淆，故界线不明显。

The second deformational level was Xibet-Fuyun meso-deep level crystalloblast mylonite belt, formed at a condition of higher temperature and pressure.

齐伯度-富蕴变晶糜棱岩带岩石变形温度压力条件高，以右行剪切为特点，具有完全不同的地质演化历史，反映它可能是在古生代期间被强烈改造的具有前震旦纪结晶基底的微大陆的残块。

We summarized the ages of the tectonic events in this area and study the nappe and the strike-slip event of East-TianShan using ~(40)Ar/~(39)Ar method.Therefore,we further understand the Paleozoic tectonic evolution in Tianshan and adjacent areas.

2总结了区内构造事件的年代学成果，并对东天山地区的推覆及走滑事件进行了~(40)Ar/~(39)Ar年代学研究，对天山及邻区古生代构造演化取得了更深入、更全面的认识。

Hongliugou ophiolite therefore is formed in an environment of small oceanic basin in continental margin in early Paleozoic.

依据这些特征分析认为，红柳沟蛇绿岩形成于早古生代初大陆边缘产生的小洋盆构造环境。

In the present paper,the Palaeozoic strata in the Wenduhala region,Xinjiang are chemostratigraphically divided based on the systematic data of spectral semiquantitative analysis obtained from the regional geological survey by means of the optimal partitioning method and the half moving window method for the ordered sample analysis.

本文利用在区调工作中获得的较为系统的岩石光谱半定量全分析数据，采用有序样品最优分割法和对分移动窗口法，对新疆温都哈拉一带的古生代地层进行了化学地层划分，并与野外根据宏观岩性特征划分的岩石地层单位进行了比

And these folds could be produced by the orogeny movement acting in the early Paleozoic.

然而这并不表明我们已经完全准确地认识了该构造带，恰恰相反，在一些问题上还存在着许多争论，如对早古生代该地区的构造变动及样式认识不清，对鄂尔多斯西缘逆冲褶皱带缺乏统一的认识等等，这些都直接影响到对该构造带的正确认识，因此对该构造带的研究还有待于进一步的深入。

My professor studies flora of the Palaeozoic Era .

我的教授研究古生代的植物群。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。