查询词典 Cretaceous

The new progresses:(1)the anatomic studies on the leaves, stems and cones of 25 species Late Mesozoic conifers, particularly those very similar to the living genera, such as Athrotaxites, Torreya, Taxus, Cephalotaxopsis, Cunninghamia and the cheirolepidaceous conifers, such as Brachyphyllum and Psudofrenelopsis;(2) the distribution and evolution of the Late Mesozoic conifers, the relationship between the concentration of CO2 of the atmosphere and the stoma index of the gymnosperms during the Middle Jurassic and Early Cretaceous;(3) the characters, compositions and ages of the Jurassic floras of Yabula Basin, and Erlian Basin of Inner Mongolia and the Early Cretaceous floras and Jiuquan basin and Beishan Area of Gansu.

对12属25种中生代松柏类的枝叶、球果及茎干化石进行了解剖研究，特别是对与现生松柏类相似的Athrotaxites， Torreya， Taxus， Cephalotaxopsis， Cunninghamia及可能属于掌鳞杉科的Brachyphyllum， Psudofrenelopsis等的研究较为深入，发现了4个新种；总结了中国晚中生代松柏类的特点及分布，讨论了重点属的起源和演化问题；研究了中侏罗世、早白垩世及现代裸子植物包括松柏类气孔与大气CO2浓度关系，发现气

Distant effect of Jurassic collisions of Qiangtang terrane,Lasa terrane and Paleo\|Pacific land onto the Eurasian land made East Qinling\|Dabie Mountains in a compressional circumstance for a long time,and suppressed its orogenic extension;whereas,Cretaceous late\|collisional extension and appearance of West Pacific trench\|arc\|basin system relieved East Qinling\|Dabie Mountains of external compression,instantly result in violent orogenic lithosphere delamination\|extension and depressurized\|calefactive melting,and consequently,led to the formation of large scale Early Cretaceous granitoids and intermediate\|acidic volcanic rocks.

羌塘地体、拉萨地体和西太平洋古陆在侏罗纪与欧亚大陆拼贴碰撞的远距离效应使东秦岭-大别造山带长期处于挤压环境，伸展作用被抑制；白垩纪的碰撞晚期伸展和西太平洋沟弧盆体系的远距离效应使东秦岭-大别地区的外部挤压消失，导致造山带岩石圈迅速强烈拆沉伸展和减压增温熔融，从而形成大规模早白垩世花岗岩类和中酸性火山岩。

Studies show that regional granitoid of late Triassic, late Jurassic, middle period of early Cretaceous and late period of e arly Cretaceous were formed successively in different stages of interactions of the Yangtze Plate, the North China Craton and the Pacific plate.

研究认为，胶东地区晚三叠世(230～200Ma)、晚侏罗世(160～140Ma)、早白垩世中期(130～125Ma)、早白垩世晚期(120～100Ma)花岗质岩石可以与扬子板块、华北板块、太平洋板块相互作用的不同阶段相对应。

The Tertiary basaltic rocks are discontiously distributed from the west to the northeast of Sudan, in the Sahara Desert, overlying the Cretaceous clastic rocks. The authors of this paper found a kind of columnar jointing in the Cretaceous clastic rocks in the Mellit area, western Sudan.

笔者在苏丹西部Mellit地区白垩系碎屑岩中发现一种罕见的柱状节理，经研究认为是沉积岩层受到中新世喷发的玄武岩熔岩流的烘烤而失水收缩形成的。

The Cretaceous sedimentary rocks were baked by the basaltic lava flow erupted in the Early Miocene, contracting in volume owing to loss of water contained mainly in the clays of the clastic rocks, and thus forming the columnar jointing. According to the occurrences of jointing and the sedimentary strata the authors calculated the two different rotations of the Mellit block: the block tilted toward 338° for 18° from Late Cretaceous to the beginning of Miocene, and tilted toward 138° for 18° since Miocene.

可以合理地假定柱状节理在形成时是垂直于大地基准面的，根据柱状节理和沉积岩层的产状，笔者计算出Mellit地块的两期旋转事件：自晚白垩世初期到中新世初期该地块向338°方向倾斜了18°，而自中新世以来又向138°方向倾斜了18°。

By analysing the molasse sediment, tectonic stress field, thrust fault system and comparing them with volcanic rocks and granites in the region, it is showed that Dabie orogenic belt had a strong intracontinental orogenesis whose deep dynamic processes were controlled by subduction with delamination during late stage of Cretaceous period-late Cretaceous period.

磨拉石沉积、构造应力场、逆冲断层系统和区域火山岩、花岗岩的综合分析表明，大别造山带早白垩世晚期—晚白垩世存在一次强烈的陆内造山作用，其深部动力学过程受控于拆沉中的俯冲作用。

The extinction or appearance of these Ostracoda always occurred in a short time interval, and can be correlated locally and globally, so they are of importance in bioeventstratigraphy. This article listed six such biological events in Qaidam Basin and discussed their causes. The extinction of Cetacella reflected temperature decrease at global scale and changes of palaeoclimate zones during the latest Jurassic and the earliest Cretaceous; The rapid decline of Cypridea in the earliest Cretaceous may be a result of the strikes of small planets; at the latest middle-Eocene Austrocypris became extinct, and at Oligocene Hemicyprinotus disappeared. These events related to the changes of the geological conditions at that time. The explosion of Cyprideis at the middle-Miocene was because the rise of Qinghai-Xizang Plateau which resulted in the dry climate and development of salt lakes.

这些水生生物的绝灭或发生均很迅速，在区域或全球范围内均可对比，具有生物事件地层学意义：Cetacella属的绝灭可能是侏罗、白垩纪之交全球性的古气候降温和气候带变化在柴达木盆地的反映；早白垩世之后Cypridea的迅速衰退是地外因素灾变的结果；中始新世晚期的Austrocypris的绝灭、渐新世Hemicyprinotus的绝灭都与当时地质条件的改变存在著内在的联系；中中新世Cyprideis的爆发推断是青藏高原隆升，导致气候乾燥、湖水咸化的结果；而晚更新世晚期1。

The study on microstructure characteristics of the five pores on the surface of ostracoda at Nenjiang Formation of Songliao Basin in Cretaceous shows that during the depositional period of Nenjiang Formation in Cretaceous,Songliao Basin should be a continental depositional system and palaeolacustrine enviroment and furthermore its water body property should be fresh saltish.

本文对松辽盆地白垩纪嫩江组介形类化石壳体表面毛细管孔的显微构造特征研究表明，白垩纪嫩江组沉积时期，松辽古湖盆应为一陆相沉积体系，其水体性质应为淡水—少盐水的古湖泊环境。

From late Jurassic-early Cretaceous to late Cretaceous, the magmatic activities decrease and the compositions of magmas change from shoshonitic and rhyolitic to alkaline basaltic.

从晚侏罗世—早白垩世早期到晚白垩世，中国东部岩浆作用明显减弱，岩浆成分从钾玄质和流纹质向碱性玄武质转变。

We also analyzed the leg bone proportions of 14 species of Mesozoic birds from the Early Cretaceous of China by using ternary diagrams and comparison with 21 specimens of Cenozoic birds, and concluded that the Early Cretaceous enantiornithines are typical arboreal birds, more basal birds from the Mesozoic are mainly arboreal with some adapted for scansorial life, and the ornithurines are characterized by both arboreal and terrestrial adaptations.

在此基础上，对中国中生代14例鸟类的栖息习性进行了分析，利用三元投影的统计方法，并以国内外新生代21例鸟类标本作为对比参考，得出辽西中生代不同类型鸟类的栖息行为特征：基干鸟类以树栖为主要习性，其中个别鸟类还具有攀援的习性，而反鸟类则是典型的树栖鸟类，今鸟类兼有树、地栖的习性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。