Conodont Evidence for the Age of the Panxian Fauna,Guizhou, China   总被引：1，自引：0，他引：1  

SUN Zuoyu SUN Yuanlin HAO Weicheng JIANG Dayong 《《地质学报》英文版》2006,80(5):621-630

  相似文献   

一种基于真实身份的BBS系统实名保障技术   总被引：1，自引：0，他引：1  

张扬  陈萍  吕洁  陈茂科  杨道全 《中国海洋大学学报(自然科学版)》2008,(Z1)

用户身份的真实性一直是BBS系统管理的重要方面之一。采用SAML协议,将跨域单点登录中的认证技术引入到BBS系统中,从而实现了用户采用真实身份登录BBS系统,保证了BBS用户的实名。并以多个高校的BBS系统作为样例,建立起基于真实身份的示范BBS系统。  相似文献   

“干化蒸发”与“回灌重溶”——对鄂尔多斯盆地东部奥陶系蒸发岩成因的新认识   总被引：3，自引：0，他引：3       下载免费PDF全文

包洪平  杨承运  黄建松 《古地理学报》2004,6(3):279-288

鄂尔多斯盆地东部奥陶系发育巨厚的蒸发岩地层,已有不少学者对其成因提出了不同的假设。本文通过对该区蒸发岩微相分布规律、剖面结构及地球化学等特征的分析,提出该区蒸发岩形成于成盐盆地与外海周期性隔绝的“干化蒸发”条件下的新认识。首次提出用“回灌重溶”机制来解释厚层石盐岩中的泥质薄夹层的成因、各种石盐岩颜色的成因及蒸发岩剖面中缺乏干化蒸发晚期阶段的钾镁盐层的原因,并由此提出 “溶积层”的概念。微相分析表明,在形成蒸发岩的盐坳盆地东部的水下古地形隆起上,发育有堤坝状的礁或生物丘等生物建隆,其在地形上的隆起构成了盐坳盆地与外海的障壁,在海平面下降期间可使盐坳与外海完全隔绝而进入干化蒸发阶段,从而形成了石盐沉积;由海平面上升所造成的突发性海水回灌事件又使先成的石盐层部分溶解（回灌重溶）,并由于不溶残余物的富集成层（溶积层）而阻止了下伏石盐层的进一步溶解。这是该区蒸发岩地层中缺少典型干化证据的主要原因。本区奥陶系马家沟组碳酸盐岩与蒸发岩间互分布的地层层序结构特征,主要受控于区域海平面变化旋回,碳酸盐岩主要形成于海侵期和高水位期,蒸发岩则主要形成于低水位期。  相似文献   

NOTES ON THE FOSSILS SHELLS OF THE SANMEN SERIES.     

金叔初 《地质学报》1926,5(2):157-159

In Dr. N. H. Odhner's Monograph on the Sanmen Fauna of Yuan Chu in the Palaeontologia Sinica (Series B. Vol. Ⅶ fasc. Ⅰ) he figured three forms of Lamprotula from Yuan Chu as follows:-  相似文献   

On Shantungendoceras, Gen.nov.,the Oldest Known Holochoanite from China     

Y.C.SUN National University of Peking 《地质学报》1937,(Z1)

The present examples were obtained from the top of the Peng-shanian (late Upper Cambrian) at Nanshan, Chaumitien, Tsinan district,Shantung by the writer and the Class of 1923 of the National Universityof Peking in 1923 and by the writer and the Class of 1937 in 1935.  相似文献   

NOTE ON THE GEOMORPHOLOGY OF THE NORTH SHENSI BASIN     

謝家榮 《地质学报》1933,(1)

The geology of the north Shensi basin has been studied to some detail bythe American geologists Fuller,Clapp and others~1 in an oil exploration partysent out in 1914 under the joint auspices of the Chinese National Oil Administra-  相似文献   

ON LOPINITE,A NEW TYPE OF COAL IN CHINA     

C.Y.HSIEH 《地质学报》1933,(1)

To the east of Nanchang,the capital of Kiangsi Province,there cropsout a continuous belt of Permian coal series~1 trending approximately in thedirection from N.E.to S.W.Broadly speaking,this coal belt forms a synclinal  相似文献   

ALEXANDRITE AND ITS POPULARITY AS A GEM-STONE IN NORTH CHINA     

何杰 《地质学报》1924,3(2)

INTRODUCTION. The reason for having this short paper made public is not so much as to unfold the results of any scientific investigation on the subject matter, but rather as a direct outcome of the response to the repeated inquiries, set  相似文献   

南海南部普林虫与“中更新世革命”   总被引：6，自引：2，他引：4  

徐建汪品先  黄宝琦翦知湣 《地球科学》2004,29(1):7-14

对南海南部ODP 1143站2.1 Ma以来沉积物中的浮游有孔虫群进行研究, 发现在冲绳海槽及南海北部普遍被认为是黑潮标志种的Pulleniatina obliquiloculata在中更新世革命(MPR)前后对冰期旋回的响应截然相反; 且在MPR之后的变化与南海北部和冲绳海槽相反, 即冰期时含量高而间冰期时低.交叉频谱分析和相位分析的结果也证实了ODP 1143站P.obliquiloculata与全球冰量变化之间的上述关系.该种在MPR前后冰期旋回的转变, 可能是由于MPR之后南海南部在冰期时切断了与印度洋之间的海水交换, 或者是冰期时海水盐度增加等因素引起的上部水体结构的重大改观所致.   相似文献   

The optical/ultraviolet excess of isolated neutron stars in the resonant cyclotron scattering model     

Hao Tong  Ren-Xin Xu  Li-Ming Song Institute of High Energy Physics  Chinese Academy of Sciences  Beijing  China  School of Physics  State Key Laboratory of Nuclear Physics  Technology  Peking University  Beijing 《中国天文和天体物理学报》2011,(12)

X-ray dim isolated neutron stars are peculiar pulsar-like objects,characterized by their Planck-like spectrum.In studying their spectral energy distributions,optical/ultraviolet(UV) excess is a long standing problem.Recently Kaplan et al.measured the optical/UV excess for all seven sources,which is understandable in the resonant cyclotron scattering(RCS) model previously addressed.The RCS model calculations show that the RCS process can account for the observed optical/UV excess for most sources.The ?at spe...  相似文献