查询词典 Cambrian

Though the fossiliferous explosion known as the Cambrian period is often thought of as the beginning of animal life, animals actually appeared for the first time during a geological twilight called the Ediacaran, 635m-542m years ago, between the end of a great ice age and the arrival of all those well-preserved Cambrian fossils.

有不计其数的化石来自于寒武纪，尽管寒武纪被认为是动物最先出现的时期，但实际上，动物出现的最早证明来自于一个地质学上的突破发现，即存在于6.35亿与5.42亿年之间的埃迪卡拉动物群化石的发现，这个时间正位于大冰川期结束，化石大量被保存的寒武纪开始之前。

A negative abnormal of δ〓C,δ〓O values and positive abnormal of 〓Sr/〓Sr values from the fossiliferous section of the Lowest Cambrian Meishucun Formation implies life depopulation and following explosion of life across the Precambrian\Cambrian boundary.

在前寒武纪-寒武纪界限附近，δ〓C，δ〓O的负异常及〓Sr/〓Sr的正异常暗示了震旦纪到寒武纪之间发生的生物灭绝事件，而随之出现的δ〓C，δ〓O的正异常，则可能指示了寒武纪初的生物大爆发。

A good many mico-landblock of the early Neoproterozoic-Cambrian volcanic rock that distribute in the Tianshan orogenic belt and on its both sides, and the Carboniferous-Permian volcanic rocks that widely distribute in the Tianshan and adjacent regions are selected for subject investigating in this paper. Renewing the ocean-land format and ocean-land conversion process of Tianshan orogenic belt in the Paleozoic is the masterstroke for this paper. On the basis of detailed field investigation, many subjects, such asregional lithology、geochemistry、structural geology、volcanic sedimentology geology、sotope geochronology and synthesis analysis study of geophysics data, are adopted as instrumentality in the paper, this study lays emphasis on the formation, evolution and dynamics of early Neoproterozoic-Cambrian and Carboniferous-Permian volcanic rock in the Tianshan and its adjacent regions to find out Carboniferous-Permian volcanic rock property, eruptive sequence, time and space distribution characteristics, to resume and reconstruct evolution process of Carboniferous-Permian volcanic rock, and to explore connection of magmatism process and lithosphere stretching action of neopaleozoic ocean-land transformation in the Tianshan region.

本文选择分布于天山及其两侧的诸多微陆块上新元古代—早寒武世火山岩和天山地区广泛发育的石炭纪—早二叠世火山岩为研究对象，以恢复重建天山造山带古生代洋陆格局和洋陆转换过程为主线，在详细的野外工作基础上，综合运用区域岩石学、地球化学、构造地质学、火山沉积学、同位素地质年代学、区域地球物理资料综合分析研究等多学科手段，重点研究天山及其邻区新元代—早寒武世和石炭—二迭纪火山岩系的形成演化及其动力学，查明天山石炭纪火山岩系的性质、喷发序列、时空分布特点，恢复重建其形成演化过程，探索天山地区晚古生代洋陆转换过程中火山岩浆作用与岩石圈拉伸作用的关系。

The correlation of hydrocarbon accumulation and major control factors between these two basins indicates that there exist premium source rocks and reservoirs in subsalt carbonate rocks of Cambrian in these basins, and regionally distributing gypsum-salt rock of Middle Cambrian is good cap rock.

通过油气成藏要素及其主控因素的对比研究发现，塔里木盆地和东西伯利亚盆地在寒武系盐下都发育了优质的烃源岩和储集层，而区域性分布的中寒武统膏盐岩是良好的盖层。

The petrographic type of the Early Cambrian granites in the Huzhong area of Heilongjiang Province, is proved to be monzonitic granite, the Early Cambrian granites are divided into four intrusive periods based on the cognate magma evolution theory, and the rock structures show that the granularity evolutive tendency is from fine grain to coarse grain in the texture.

黑龙江省呼中地区早寒武世花岗岩的岩石类型为二长花岗岩，依据同源岩浆演化理论划分为4个侵入期次，岩石结构表现出一期结构演化序列中由细粒向粗粒的演化趋势。

In the Middle and Late Cambrian, similar to the lithofacies palaeogeographic pattern of the Early Cambrian, the land area was gradually reduced, the basin area was enlarged, while the Tarim carbonate platform changed little.

中寒武世和晚寒武世的岩相古地理格局与早寒武世相似，但陆地面积逐渐缩小，盆地面积逐渐扩大，塔里木碳酸盐岩台地变化不大。

Based on the quantitative and qualitative data from the study of stratigraphy and petrology of outcrop and well sections, according to the single factor analysis and multifactor comprehensive mapping method, the single factor maps of the Lower, Middle and Upper Cambrian, and the lithofacies palaeogeography maps of the Early, Middle and Late Cambrian of Tarim area, are compiled.

在39个露头剖面和钻井剖面的各种单因素定量及定性资料的基础上，采用单因素分析多因素综合作图法，编制出了塔里木地区寒武系下、中、上统的各种单因素图及相应的寒武纪早、中、晚世的岩相古地理图。

The metal elements of the volcanic-hosted massive sulfide deposit have two sources, the copper and zinc are derived from rhyolitic magmas whereas the lead are probably related to old sediments overlying the rhyolites.(4) It is suggested here that the volcanic rocks hosting massive sulfide deposit in the north Qilian orogen, which are previously considered as a bimodal suite of Neo-proterozoic to middle Cambrian age in a continental rift, are virtually related to subduction magmatism in Ordovician age, and there might have no continental rift magmatism of Neo-proterozoic to middle Cambrian in the north Qilian.

Th/Ta比高(5.0～11.7)，εNd为较大的负值(-2.6～-8.4)，流纹岩的形成可能是两个端元组分混合的过程、或是上地壳混染的结果，形成在活动陆缘环境；(3)北祁连块状硫化物矿床成矿金属物质具有两种来源，Cu、Zn等来源于流纹岩，而Pb的来源可能与古老沉积物有关；(4)本文认为，前人厘定的北祁连新元古代-中寒武纪赋存块状硫化物矿床的大陆裂谷双峰式火山岩应是与俯冲作用有关的奥陶纪火山岩，说明北祁连可能不存在新元古代-中寒武纪的大陆裂谷活动。

The assessment result shows: the infirm zone of the aquifer basically distributes in the limestone area of low Ordovician -top Cambrian, which the cranny is uncovered and overgrown, the area is also the direct recharge area of spring basin. In addition , in the rivers valley area of Jin xiuchuan and Bei sha river, because the leakage of the river is serious, the contamination can leak easily to the groundwater in the area of surface and near the river, so this area also is the infirm zone. Frail zone distributes in the uncovered area of mid-Cambrian which the canny upgrowth is commonly, parts of the zone distributes the relatively impervious layer such as shale. In the north-west area where is the down-rivers of two rivers, the alluvium is thick, the protection to the limestone is good.

评价结果显示，济南岩溶泉域含水层很脆弱区基本分布在济南泉域的岩溶裂隙非常发育的、裸露的下奥陶～上寒武的石灰岩地区，该地区也是泉域的直接补给区，另外在锦绣川、北沙河等河谷地带，由于河床渗漏严重，地表水及近河地带污染物容易渗入地下，也为很脆弱区；脆弱区一般分布在裸露的中寒武地层区，岩溶裂隙发育一般，部分地带分布有页岩等相对隔水层；西北部两河下游冲积层较厚，对下伏石灰岩保护功能较强，属于脆弱性相对很低区。

The strata inside and outside the cave are argillaceous bedded limestone and wormkalks of late Cambrian, that is, 490—500 million years before present.

洞内外地层为距今4.9亿年—5亿年的晚寒武世泥质条带灰岩和竹叶岩状灰岩，它们都是在浅海中生成的，说明当时鱼谷洞地区曾是一片大海。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。