Neue ZnS-Polytypen (9R, 12R und 21R) in mesozoischen Sedimenten NW-Deutschlands     

Dozent Dr. Siegfried Haussühl  Dozent Dr. German Müller 《Contributions to Mineralogy and Petrology》1963,9(1):28-39

Summary Argillaceous sediments of jurassic and lower cretaceous age in NW-Germany contain in several localities authigenous ZnS-polytypes. The crystals with a maximum height of 2 mm exhibit hexagonal-pyramidal and trigonal-pyramidal habit.With X-ray rotation and precession technique the following polytypes could be identified: Sphalerite (3 R = 3 C) 211, 411, 6H 9R, 12R, 15R and 21R.The 9 R-, 12 R- and 21 R-polytypes have not until now been described elsewhere.The structures of the new polytypes were determined as 9R=(21), 12R=(13) and 21R=(3112).Oriented intergrowths of R- and H-polytypes were frequently observed. From the intergrowth-phenomena arguments for the environmental conditions of formation can be deducted.[/p]  相似文献   

Structure and petrology of an alpine peridotite on Cypress Island,Washington, U.S.A     

Dr. C. B. Raleigh 《Contributions to Mineralogy and Petrology》1965,11(7):719-741

A study of the structural petrology of a peridotite exposed on Cypress Island in Skagit Co., Washington, U.S.A. has been carried out. The Cypress peridotite is, by virtue of its composition, structure and associations, typical of ultramafics of the alpine type. It contains relict layering and accumulative textures which show it to have originated by crystal settling from a magma of unknown initial composition. Parallelism of lineations and b-axes of folds in the layering with well-developed [100]-maxima in the fabrics of olivine crystals is considered to have arisen through a penetrative deformation of the mass accompanied by plastic flow or recrystallization of the olivine. An indication of the minimum temperature of the deformation is provided by cross-cutting veins of pyroxenite which have not participated in the folding. The most satisfactory interpretation of the overall fabric of the peridotite is that it was deformed, possibly during intrusion, as a crystal mush, and that filter pressing due to compaction of the solid particles by plastic flow or recrystallization removed all but a small percentage of the magmatic fraction which then crystallized following cessation of the movements.  相似文献   

Buchbesprechungen     

F. Steinhauser  W. Mörikofer  K. Cehak  W. Müller 《Theoretical and Applied Climatology》1965,13(4):558-568

Ohne Zusammenfassung  相似文献   

Availability of Aerial Photographs     

C. I. M. O'Brien. 《The Photogrammetric Record》1965,5(25):63-64

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Buchbesprechungen     

F. Steinhauser  W. Mörikofer  J. Drimmel  Peter Steinhauser 《Meteorology and Atmospheric Physics》1965,15(2):251-264

Ohne Zusammenfassung  相似文献   

Note on the propagation of waves from a spherical cavity in an infinite solid     

S. K. Chakraborty  A. B. Roy 《Pure and Applied Geophysics》1965,60(1):23-28

Summary The present note, as its title implies, is concerned with the investigation of disturbances in an infinite elastic medium containing an initial magnetic field in the axial direction. The equations ofMaxwell, those of elasticity have been effectively made use of to solve the problem.  相似文献   

IDENTIFYING AND ASSESSING PROBLEM AREAS IN SOIL EROSION SURVEYS USING AERIAL PHOTOGRAPHS     

R. G. B. Jones  M. A. Keech 《The Photogrammetric Record》1966,5(27):189-197

Gully erosion has for many years been a problem in Rhodesia1s Tribal Trust Lands. This paper describes how Soil Conservation Service staff, with no previous ground knowledge of these areas, used good quality 1/25,000 scale aerial photographs to measure the extent of the gully erosion and to pinpoint erosion “black spots.” This enabled quick and reliable estimates of the cost of reclamation work to be made without the need for time-consuming field survey. The survey method discussed is capable of wide application wherever gully erosion occurs and needs to be brought under control.  相似文献   

LAND USE ACTIVITY CLASSIFICATION AND THE USE OF ECONOMIC CENSUSES     

Maurice B. Ballabon 《The Professional geographer》1966,18(1):44-44

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SOME INTRODUCTORY NOTES ON REGIONAL DIVISION AND SET THEORY     

Reginald G. Golledge  Douglas M. Amadeo 《The Professional geographer》1966,18(1):14-19

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Climatic satellite monitoring of the external heat balance of the oceans and Black Sea     

N. A. Timofeev  A. V. Yurovskii 《Physical Oceanography》2007,17(6)

The long-wave outgoing radiation, effective cloudiness equal to the product of the total cloud amount by their optical density, and the sea-surface temperature determined from the satellites are used to determine the annual course of the components of external heat balance on the sea surface whose climatic anomalies, parallel with the meridional heat and water transfer in the ocean-atmosphere system, specify the intraannual and interannual large-scale variations of weather in different regions of the Earth. The development of these studies is connected with the progress of satellite hydrophysics because the data obtained from the space become sufficiently exact, regular, and global. The increase in the existing data array on the external heat balance of the oceans from ∼15–20 to 100 yr and more would promote the solution of the problem of oscillations of Earth's climate. We present examples of coordinated numerical analysis of the heat balance of the upper (0–100 m ) layer of the Black Sea performed on the basis of the shipborne and satellite data. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 6, pp. 59–75, November–December, 2007.  相似文献