ON THE MAGNESIAN CONTENT OF THE PRE-GAMBRIAN MARBLE IN NORTH CHINA.     

翁文灏  李学清 《地质学报》1926,5(1)

The senior author has, since several years,~1 pointed out the high magnesian content in the upper Wutai formation in which frequently occur  相似文献   

A STONE METEORITE FROM NORTHERN KIANGSU.     

李学清 《地质学报》1925,(Z1)

Ⅰ. GENERAL DESCRIPTION. This meteorite is obtained from the province of Kiangsu. The weight is about 82 grams. The specific gravity is 3. 6. The shape is conical. This conical shape is evidently due to the atmospheric pressure which exerts  相似文献   

THE NATURE AND EXTENT OF A STRATIGRAPHICAL BREAK IN THE CAMBRO-ORDOVICIAN LIMESTONES OF NORTHERN ANHUI,AND ITS BEARING UPON THE SYSTEMATIC CLASSIFICATJON OF THE CAMBRO-ORDOVICIAN STRATA   总被引：1，自引：0，他引：1  

AMADEUS W.GRABAU   《地质学报》1922,1(Z1):44-88

Those who have followed the historical development of the systematicclassification of the old Palaeozoic rocks in Europe would undoubtedly wellremember how the Ordovician became recognized as a well-defined,independ-  相似文献   

A PETROGRAPHICAL STUDY OF THE CHINESE AGALMATOLITES     

H.T.LEE 《地质学报》1928,7(3)

Ⅰ. INTRODUCTION. The most popular Chinese agalmatolites are Shoushanshih (壽山石), Changhuashih (昌化石), Chingtienshih (青田石) and Kwanglushih (廣綠石). They are named after the names of places, as the name Shoushanshih is from  相似文献   

DATA RELATING TO THE STUDY OF THE PROBLEM OF GLACIATION IN THE LOWER YANGTZE VALLEY     

李四光 《地质学报》1934,(1)

In a commemorable evening—I believe it was in the early part of December, 1933—when I happened to discuss the problem of Pleistocene climate in China with the late Dr. Davidson Black, I informed him, without  相似文献   

GEOLOGY OF KENKOU ON THE HUNAN-KWANGTUNG BORDER AND ITS BEARING TO THE OROGENY OF THE NANLING RANGES     

李毓堯  朱森 《地质学报》1934,(1)

INTRODUCTION In the winter of 1932 and the spring of 1933, the Nanling Mountain ranges covering the borders of Hunan, Kwangtung, Kwangsi and Kueichou were studied by the members of the National Research Institute of Geology,  相似文献   

QUATERNARY GLACIATION IN THE YANGTZE VALLEY     

李四光 《地质学报》1934,(0)

Eleven years ago when this society held its Third General Meeting I had the opportunity of calling your attention to certain strange deposits and topographical features that came under my notice in certain parts of North China. I showed you a number of striated boulders that could not be attributed to mere  相似文献   

DISTRIBUTION OF THE DOMINANT TYPES OF THE FUSULINOID FORAMINIFERA IN THE CHINESE SEAS     

李四光 《地质学报》1931,(1)

Since the publication of the Fusulinidae of North China much information has been obtained from the southern seas of this country of the Carboniferous and Permian Periods. We are now in the position to form a birds eye  相似文献   

Coordinated observations of two large Leonid meteor fireballs over northern New Mexico,and computer model comparisons     

J. ZINN  J. WREN  R. WHITAKER  J. SZYMANSKI  D. O. Revelle  W. PRIEDHORSKY  J. HILLS  G. GISLER  S. FLETCHER  D. CASPERSON  J. BLOCH  R. BALSANO  W. T. ARMSTRONG  C. AKERLOF  R. KEHOE  T. McKAY  B. LEE  M. C. KELLEY  R. E. SPALDING  S. MARSHALL 《Meteoritics & planetary science》1999,34(6):1007-1015

Abstract— This paper describes the coordinated results of several sets of measurements of two Leonid meteor fireballs over northern New Mexico at 1:32 and 3:06 MST, respectively, on the night of 1998 November 17. The measurements included visible band photometry on both events, as well as filtered 5890 Å all-sky images of the Na airglow. Also, for the 3:06 a.m. event, we obtained an infrasound measurement of the hydrodynamic yield. For the 1:32 a.m. event, we obtained a set of visible band charge-coupled device (CCD) camera images of the meteor train for times extending to 30 min after the initial impact. The measurement results have been combined to derive an optical efficiency for the intense early-time optical flash, and the total explosion yields and masses for both of the meteors. We have also done a set of numerical radiation, hydrodynamic, and chemistry computations to investigate the nature and distribution of the long-lasting airglow. We attribute the brightest visible airglow to atomic O 5577 Å line emission, with additional contributions from atomic Na emission and NO₂ chemiluminescence. The near-infrared atmospheric bands of molecular O₂ should be very strong as well. All of the band emissions are expected to show a hollow limb-brightened structure.  相似文献   

岩质边坡稳定性的工程地质研究   总被引：14，自引：0，他引：14       下载免费PDF全文

孙玉科  李建国 《地质科学》1965,6(4):330-352

岩质边坡稳定问题是工程地质学的一个重要研究課题,也是工程实践中迫切要求解决的问题。但是,对这个问题的研究,无论是国內国外都在进行探讨,还沒有形成一套完整的理论体系。为了推动这一方面的研究工作和解决生产实践中所提出的问题,本文试图从工程地质观点,并结合力学概念作一初步探讨,不妥和错误之处,希读者批评指正。  相似文献