古生代的

The following examples of oil and gas fields in distributary and delta-fringe sand bodies range in age from Late Paleozoic to Middle Cenozoic.

下面所列举的是分布于分流和三角洲前绿砂体的油气田的例子，在地质时代上从晚古生代至中新生代。

The performances of modified asphalt with different contents of Indonesian Buton Rock Asphalt and Esso based dasphalt A-70 are studied with the experiments.

布敦岩沥青是产于印度尼西亚布敦岛的天然岩沥青，由古生代石油渗透到岩层中，经过长期的海底沉积、承受压力和地质变动而形成的沥青岩，其中沥青含量约为20%，其余为石灰岩矿物质。

Furthermore,because the interior and exterior characters of fora-miniferal apertures are becoming more and more important in the classification of foraminifera,we should pay more attention to the free specimen s from Paleozoic foraminiferal stu.

另外由于口孔的内部和外部特征在分类学中的地位越来越重要，所以通过实体化石来研究古生代有孔虫理应受到更多的重视。

The Geochronology results from the magmatic rocks in study area show that the features of the acid magmatism in Paleozoic are that the ages of the rocks became younger from the eastern to the western and from the northern to the southern.

3通过对岩浆岩年代学成果的总结分析，发现研究区古生代与板块俯冲及碰撞相关的酸性岩浆活动的时空规律是：自东向西由老到新，自北向南由老到新。

Massif form the hard base on the lower part of the ground, above which Okcheon geosyncline and Pyeongan basin, Daedong basin, and Gyeongsang basin form the sedimentary basins of the Paleozoic era and the Mesozoic era.

如果将其作为构成土地的单位加以划分，京畿陆块与小白陆块形成了下部的坚实基础，其上形成了沃川地向斜带和平安盆地、大同盆地及庆尚盆地等古生代与中生代的沉积盆地。

Data of major andminor elements in magnetite, cassiterite, galena and sphalerite from oredeposits within this ore belt suggest that these ore deposits are of skarn,hydrothermal, porphyry and greisen types related to Yanshanian magmaticactivity and that iron in ores came from regional Permian marine interme-diate-basic volcanic rocks whereas partial lead and zinc from Permian geo-synclinic sediments.

矿带中各矿床的磁铁矿、锡石、方铅矿、闪锌矿的主元素和微量元素数据表明，这些矿床是属与燕山期岩浆活动有关的矽卡岩型、热液型、斑岩型和云英岩型矿床；其成矿金属组分中的铁来源于区域晚古生代海相中-基性火山岩，部分铅锌来源于区域二叠纪地槽沉积物。

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。

The Tarim basin is developed upon the pre-Nanhua crystalline basement, but both of the Tajikistan basin and the Karakum basin have developed upon the pre-Permian folded basement, which is formed after the close of the southern Tianshan Ocean.

本文系统归纳总结与对比分析了塔里木盆地、北阿富汗-南塔吉克斯坦盆地和卡拉库姆盆地的油气地质特征，并在此基础上探讨了该地区古生代以来地质演化对盆地演化和油气地质特征的控制作用。

The result of MT data processing and inversion integrating geological and petrophysical data shows the existence of Paleozoic formations and is significant for the evaluation of pre-Tertiary oil/gas resources in the southern Huanghai basin.

通过对试验观测资料的处理和反演，并结合地质、物性资料进行综合分析，结果表明在南黄海盆地海底以下深部还存留有古生代地层，这对于南黄海前第三系含油气前景的评价具有重要意义。

, 5. 0±0.4 ‰. They are different obviously from those of fossil brachiopods in other paleozoic periods and modern shells.

因此无论是δ〓O，还是δ〓C都与古生代其它地质时期以及现代腕足生物壳体存在很大差别，表明地质历史时期碳酸盐岩的原始氧、碳同位素组成并不是稳定不变的。

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。