The developmental trend of labrum and median eyes of Orsten-type preserved Phosphatocopina (Crustacea)     

LIU Zheng  & DONG XiPing  School of Earth  Space Sciences  Peking University  Beijing  China  State Key Laboratory of Palaeobiology  Stratigraphy  Nanjing Institute of Geology  Palaeontology  Chinese Academy of Sciences  Nanjing 《中国科学:地球科学(英文版)》2010,(1)

The Phosphatocopina (Crustacea,Arthropoda) is an important group of 'Orsten-type' preserved fossils.It is resolved as the sister-group of Eucrustacea.Here we study the labrum,the median eyes,and the inner lamella of Phosphatocopina based on the selected specimens respectively from western Hunan,South China,and Sweden.The labrum characters of different species exhibit interspecific difference.The ratio of labrum length/shield length is significant to the reconstruction of the ontogeny of phosphatocopines.The...  相似文献   

武夷山成矿带桃溪隆起、岩浆侵入和区域铜多金属矿成矿作用   总被引：2，自引：0，他引：2  

陈世忠  马明  陈刚  周延  朱筱婷  邱金亮  毛建仁 《地球科学》2010,35(6):969-984

武夷山成矿带内矿区的最大特征就是分布有老地层和岩浆岩.老地层集中分布区——桃溪隆起区是武夷山隆起的一部分, 表现为变质核杂岩的特征, 其中分布着大中型铜多金属矿床和大量的多金属矿点, 如紫金山铜金矿、岩背锡矿和红山铜矿, 它们是武夷山成矿带乃至中国东部的典型特征.主要矿床的成矿年龄集中于130~90 Ma, 属燕山晚期; 成矿特征表现为斑岩型-岩浆热液型铜多金属矿.成矿斑岩体成岩时代90~140 Ma, 多为燕山期复式杂岩体的中晚期, 桃溪隆起区这种时空一致性是由于中生代晚期岩石圈拆沉的产物.桃溪隆起区在中生代晚期经历了岩石圈加厚期后的拆沉、软流圈物质侵入、岩浆作用及其伴随的成矿作用.这些认识对该区找矿部署具有重要的意义.   相似文献   

Unusually Broadened Spectral Profiles Observed in Solar Prominences     

Eijiro Hiei 《中国天文和天体物理学报》2004,4(4):377-389

After surveying the spectra of 39 prominences observed by the Multichannel Infrared Solar Spectrograph at Purple Mountain Observatory and the 25 cm coronagraph at the Norikura Solar Observatory, we found that about 28% of them show small spatial scale (6"- 8") and short time scale (tens of seconds to a few minutes), unusual large broadening and large shift velocities in spectral lines including Hα, Hβ, Hε, Ca Ⅱ H, Ca Ⅱ K, Ca2Ⅱ 8542 A, He Ⅰ D3 and HeⅠ 10830 A. We present in detail two typical events observed respectively on 2002 May 27 and 1981 August 2. The full-width at half maximum of the widest profile of the 2001 prominence is 1.8 A for Ha and 2.9 A for He I 10830 A, while that of the 1981 prominence is 5.3 A for Hβ, 3.6 A for Ca Ⅱ K, 4.0 A for Ca Ⅱ H and 2.8 A for He Ⅰ D3. Such broadenings generally occur at a level of several-thousand kilometres above the chromosphere. Further, most of these prominences manifest a rotation of (0.4-1.35) ×10-2 rad s-1 pointing to the Sun and large line  相似文献   

ODD AND EVEN SYMMETRY OF ATMOSPHERIC CIRCULATION—THEORETICAL BASIS AND CLIMATIC CHARACTERISTICS          下载免费PDF全文

管兆勇)  徐建军  王盘兴) 《Acta Meteorologica Sinica》1994,(2)

Analysis is done of the distribution of odd and even symmetric components of circulations on a global basis in termsof observations and technique for the odd/even symmetry,indicating that climatic features of the component patternsand their temporal evolution are able to reveal their influence of land-sea discrepancy in the Northern and SouthernHemispheres,the time scale of atmospheric response to radiation heating,circulation waveform structure and seasonaladjustment of global circulation.  相似文献   

国土资源信息系统软件开发方法研究   总被引：2，自引：0，他引：2  

舒飞跃  龚敏霞  曹伟  陈慧玲  吴相燚 《国土资源信息化》2005,(2):21-25

本文通过分析江苏省国土资源信息系统的各种软件的特点,对比各种软件开发方法的优缺点,研究了国土资源信息系统的各种子系统软件的开发方法,提出了一套国土资源信息系统开发方法与模式解决方案。  相似文献   

国土资源电子政务应用软件平台技术要求研究     

舒飞跃  龚敏霞  王滨  丁亮  陈陟 《国土资源信息化》2005,(6):21-25

为提高行业软件系统的重用性,本文通过对MIS应用软件平台与GIS应用软件平台进行比较研究,结合国土资源业务特点,提出了国土资源电子政务应用软件平台的技术要求。  相似文献   

被遗忘的三角洲--论淮河三角洲的形成与演化   总被引：1，自引：0，他引：1  

哈承祐朱锦旗  叶念军黄敬军  龚建师陆华 《地质通报》2005,24(12):1094-1106

导淮自桐柏，会于淮阴，东入海，是追索淮河三角洲形成的由来。公元1128-1885年史称夺准700年，古淮河入海水道为黄河泥沙堵塞，从此淮河改道经长江入海，遂使淮河三角洲不为人们提起。本文从区域地质构造入手，阐述淮河水系的发展、淮河三角洲的形成与区域第四纪海进、海退、成淡水演化过程，为正确认识淮河尾闾的发展演化提供科学依据，为振兴淮河三角洲，走高附加产值的大农业生态经济体系，构建与长江三角洲互补、互助、互利、互赢的可持续发展做出贡献。  相似文献   

福建碧田金银铜矿床冰长石的^40Ar／^39Ar年龄   总被引：10，自引：1，他引：10  

刘晓东  华仁民 《地质论评》2005,51(2):151-155

采用40Ar/39Ar快中子活化年代学方法对采自碧田金银铜矿床的冰长石进行了年龄测定.结果表明,冰长石年龄为91.47土0.39Ma,代表了碧田矿床金-银矿化的形成时代.作为紫金山-碧田地区大规模铜金(银)矿化作用冰长石-绢云母型浅成低温热液贵金属矿床的典型代表,碧田矿床成矿年龄的确定,为本区不同类型铜金(银)矿床时空关系和成因机制的探讨提供了重要的依据.  相似文献   

A Primary Observation on Palynofacies of the Chuangde Section(Late Jurassic-Cretaceous),Gyangz■,Southern Tibet          下载免费PDF全文

LI Jianguo GUO Zhenyu Nanjing Institute of Geology  Paleontology  Chinese Academy of Sciences  Nanjing  Jiangsu 《《地质学报》英文版》2007,(6)

A primary study on palynofacies,which concerns the paleoenvironments from the sight of association of sedimentary organic matter preserved in sedimentary rocks,is conducted for a Late Jurassic-Cretaceous succession at Gyangz(?),southern Tibet.Two palynofacies are recognized,which are formed in different sedimentary environments.The one in the pelagic is infertile in organic productivity and monotonous in component and is dominated by AOMA,while the other,being closely bound up with the slope,is characterized by abundant black phytoclasts that are possibly of algal origin and contains much AOM.The influence of terrestrial input is clear in the latter,for particles generated from terrestrial plants are common.A number of fossil spores and pollen together with some dinocysts are discovered,but they are normally in a bad condition of preservation.Nevertheless,this convinces us that the late Jurassic-Cretaceous succession in the Gyangz(?)area has a potential for palynological stratigraphy.We have also proved that the volume of PM can achieve similar results in presenting the productivity of organic matter as the weight of TOC does.This technique is much easier in the laboratory than that we do with TOC.  相似文献   

中国东南部白垩系综合地层学研究的新进展   总被引：9，自引：0，他引：9  

李耀西  汪迎平等 《地质学报》2001,75(4):451-458

笔者以盆地分析学、构造－沉积学、事件地层学、层序地层学等多学科手段对中国东南部白垩系进行综合研究,对过去有争议的、特别是关键性的地层问题,从成因机制上进行分析判断,并提出了一些新的看法。研究认为,该区盆地的形成与演化、构造－沉积旋回、地层相序与层序、地质事件等,主要受控于相同的慕式构造运动,是同一诱因形成的、表现形式不同的地质记录,因而彼此间有成因联系和对应关系,可以互相验证和补充,从而达到深化研究的目的。通过对上述手段所获信息的综合研究,对“塘上组”的时代归属、“丽水运动”是否存在、永康群与“天台群”以及方岩组、中戴组、“赤城山组”等类磨拉石建造间的层位关系等有争议的问题提出了新的认识。最后,还提出了中国东南部各省白垩纪地层的划分对比方案。  相似文献