Book reviews     

Konrad Murr  Jaromir Demek  Athanstios P. Kamarianos  Xanthippos N. Karamanlis  Radan Květ  Ludwig Ellenberg  Anton Gosar  Jörg Stadelbauer  Wolf Tietze 《GeoJournal》1994,34(3):332-336

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The constant part of the tidal field in the theory of heights     

Antonín Zeman 《Studia Geophysica et Geodaetica》1991,35(2):75-80

Summary The problem of the constant part of the tidal field is still topical in view of the recommendations of IAG[1, 2] to eliminate the tidal effect of external masses from all geodetic measurements under preservation of the effect of the time-constant tidal deformation of the Earth. The paper discusses the consequences of accepting this recommendation for normal heights, and suggests a solution based on the new definition of the normal gravity field[3].  相似文献   

Magnetostratigraphic Data From Late Quaternary Sediments From the Yermak Plateau, Arctic Ocean: Evidence For Four Geomagnetic Polarity Events Within the Last 170 Ka of the Brunhes Chron   总被引：2，自引：0，他引：2  

Norbert R. Nowaczyk  Thomas W. Frederichs  Anton Eisenhauer  Gunilla Gard 《Geophysical Journal International》1994,117(2):453-471

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Structural impact of international tourism in Yugoslavia     

Anton Gosar 《GeoJournal》1989,19(3):277-283

This paper outlines the structure of international tourism in Yugoslavia and then discusses thevarious impacts its development has had, notably changes in the population structure. The growth of international tourism has enabled a nontraumatic restructuring of the younger generation island and coastal population away from fishing and farming to employment in tourism. Tourism has revived some Yugoslav regions, especially the Adriatic Coast, in a demographic and economic sense and has made possible further development.  相似文献   

Metamorphism of siliceous dolomites at Naxos,Greece     

J. Ben H. Jansen  Anton H. van de Kraats  Henk van der Rijst  Roelof D. Schulung 《Contributions to Mineralogy and Petrology》1978,67(3):279-288

Siliceous dolomitic marbles at Naxos, Greece, are crystallized in a range of metamorphic temperatures, estimated from 350 to 700 °C and a total pressure of about 6 kb. A number of low variant assemblages of this rock-system have been studied. The sequence of these metamorphic assemblages is a function of increasing metamorphism, and this is in agreement with other fielddata and with experimental data for the chemical system CaO-MgO-SiO₂-H₂O-CO₂ (-HF). The composition of the associated fluid inclusions may be considered reasonably correct in the light of experimentally obtained X _CO2 values for the mineral equilibria, extrapolated for a total pressure of about 6 kb at the interpolated temperatures at the sample locations.  相似文献   

Estimate of the effect of changes of atmospheric pressure on the results of levelling     

Antonín Zeman  Reviewer M. Pick 《Studia Geophysica et Geodaetica》1978,22(3):241-247

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Petrography and geochemistry of basaltic rocks from the Conrad fracture zone on the America-Antarctica Ridge     

Anton P. le Roex  Henry J.B. Dick 《Earth and Planetary Science Letters》1981,54(1):117-138

Intrusive and extrusive basaltic rocks have been dredged from the Conrad fracture zone (transecting the slow-spreading America-Antarctica Ridge). The majority of rocks recovered are holocrystalline with the dominant mineral assemblage being plagioclase plus clinopyroxene with or without minor Fe-Ti oxides (olivine occurs in only three samples) and many of the samples show evidence of extensive alteration. Secondary minerals include chlorite, actinolite, K- and Na-feldspar, analcite and epidote. In terms of bulk chemistry the rocks are characterized by their generally evolved and highly variable compositions (e.g.Mg^*=0.65?0.35;TiO₂=0.7?3.6%;Zr=31?374ppm;Nb=<3?21ppm;Y=17?96ppm;Ni=100?9ppm), but with respect to the immobile incompatible element ratios (e.g. Zr/Nb, Y/Nb, La/Sm) are similar to “normal” or depleted mid-oceanic ridge basalts.Quantitative major and trace element modelling indicate that most of the variation observed can be attributed to low-pressure fractional crystallization of plagioclase plus clinopyroxene in approximately equal proportions with or without minor Fe-Ti oxides. The range in composition can be accounted for by up to 76% fractional crystallization. Although ferrobasalts have not frequently been associated with slow spreading ridges, the extreme differentiation observed in the Conrad fracture zone basalts implies some additional constraint other than spreading rate on the formation of ferrobasalt and reaffirms the importance of extensive crustal differentiation during the production of this basalt type.  相似文献   

On the determination of the non-linearity of the gravimeter scale     

Ivanka Jakubcová  Věra Marvanová  Miloš Pick  Antonín Novotný  Reviewer Z. Šimon 《Studia Geophysica et Geodaetica》1982,26(2):193-196

Summary The results of two different methods of the determination of the non-linearity of the gravimeter scale are compared; the economy is discussed as well.  相似文献   

Seismotectonic model of the upper part of the Earth's crust of Czechoslovakia     

Vladimír Schenk  Zdeňka Schenková  Lubomil Pospíšil  Antonín Zeman  Reviewer J. Zahradník 《Studia Geophysica et Geodaetica》1986,30(4):321-330

Summary A correlation of the earthquake occurrence on the territory of Czechoslovakia and in its close neighbourhood with the data on the neotectonic and geomorphological development of the respective area, the recent movements of the Earth's crust, the courses of photolineations and on the geophysical fields enabled the fundamental structural blocks in the upper part of the Earth's crust to be singled out. The contact zones established between the above blocks exhibit increased long-term movement tendencies particularly in the Neoid period. A seismotectonic model of the upper part of the Earth's crust of Czechoslovakia, compiled with the use of the data mentioned above, is described.

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Die Flußspatlagerstätten Asturiens/Nordspanien und deren Genese     

Prof. Dr. Anton Forster 《International Journal of Earth Sciences》1974,63(1):212-263

The fluorspar deposites described are located within the permotriasic basin of Western Asturias/Northern Spain. The block-faulted basin is bordered in the south by the Cantabrian Mountainrange, folded in Hercynian times. The fluorspar deposites overlie the strata of this paleozoic base and the fluorspar-layers dip gently to the North at 10 to 15?. They are related to the angular unconformity between the mostly eroded Paleozoic rocks and the overlying, mainly red, Permotriasic sediments. Volcanic rocks apear only in few places, where they are intercalating more ore less the upper parts of triasic strata, reddish shales of “Keuper” age. The occurrences fluorspar-layers are found mainly in the uneroded areas where the basal Permotriasic is still preserved on the old Permian land surface, underlain preserved on the old Permian land surface, underlain mostly by Devonian and lower Carboniferous limestones, marls and shales. A special rock type, a breccia between the foulded Paleozoic base and the unfolded Permotriasic sediments forms a marker horizon, thought to have originated from the fracturing of the underlaying Paleozoic rocks. The genesis of fluorspar and breccia is thought to be connected with the formation of a peneplain-like land surface and its repetated uplift and depression, i. e. repeated flooding by sea and subsequent emergence. Light-grey to reddisch sand- and siltstones as well as small pebble conglomerates were deposited in erosion channels and karst holes, sometimes extending through the breccia down into the massiv lower Carboniferous and Devonian base. It is in these sediments, that the fluorspar is found to produce dispersed or in massiv form sheet-like and flat-lying bodies as well as channel-like, occurrences. In areas of strong post, Permian tectonic movements the stratabound mineralisation were sometimes mobilized to form dike-like deposites. The morphological and petrological structure, e. g. the complete lack of primary zoning even in dike-like deposites, and the geological situation as a whole contradict the opinion of G.Einecke (1956) that these fluorspar deposites originated from hydrothermal solutions, emanating from plutonic or volcanic rocks. Geochemical investigations of soil samples and drill cores from Paleozoic rocks point to the origin of fluorine from Devonian and Carboniferous, rich in organisms (Coal-strata) and consisting of shales marls and limestones (or even older rocks) which were eroded and redeposited in Permian times.  相似文献