Vanadyl ions in ancient marine carbonaceous sediments

Vanadyl ions in ancient shaly-type sedimentary rocks of marine origin from a variety of world sources and geological periods have been investigated using electron spin resonance. These and other results provide evidence that there are two types of vanadyl ions. The first is inorganically bound in the clay/ silicate fraction of these rocks and the second type is associated with vanadyl porphyrin compounds.     

The copper deposits and geotectonic setting of the Thethyan Eurasian Metallogenic Belt

The paper is concerned with the relationships between porphyry copper and massive-sulfide copper deposits, and their geotectonic environments in the Tethyan Eurasian Metallogenic Belt. This belt is located between the Afro-Arabian and Eurasian plates, almost 10,000 km long, linking the Alpine metallogenic system in Europe with Pacific system. A plate tectonic model for the tectonic evolution of this metallogenic belt in space and time is presented with emphasis on specific features of individual sectors.The paper was presented on the 25th International Geological Congress in Sydney, August 1976 (Symp. 104. 1)     

A case analysis of heavy rainfall causing flash floods

Summary The whole area of Mount Medvednica and the surrounding lowland including the Zagreb city area experienced extensive rainfall on 3 to 4 July 1989 causing flash floods. Daily precipitation amounts measured at 0600 UTC on 4 July were in proportion to the mean monthly totals of July for this region. The maximum rainfall amounts for periods of 2 to 12 hours recorded during this storm, had a return period greater than one hundred years in this region. They were produced by intensive development of a mesoscale convective system along the slowly moving frontal zone lying over north-western Croatia. The interaction between mesoscale processes and the synoptic scale development led to the intensive transformation of the initial air masses at the frontal line into those with a much stronger convective potential.With 5 Figures     

La séismicité de la région du Lac de Scutari

Summary The domain of Skutari Lake affords considerable geographical, tectonic and seismological problems. The shrinkage of the Dinar mountain system from NW and almost simultaneus to that of the Pinds from S.E. met and under the mutual resistance declined towards NE and E.On the site of their joincture resulted considerable dislocations and blocks lowering of fractured faults. Therefrom resulted the formation of the Skutari Lake basin and its tectonic domain. On this break are frequent earthquakes of different intensity and rather frequent seismic catastrophes. Though, there aren't many chartered data of previous years. The author used statements of the last hundred years (1837–1940). During that period on Skutari tectonic depression two series of seismic catastrophes at an interval of exactly fifty years. First series of five catastrophes desastered in 1855 (3. VII-14.VIII); second series consisting also of five catastrophes araised very region on the same epicenters in 1905 (1.VI-10.VIII). In both of these series catastrophical shocks followed nearly on the same date.The general opinion prevailed that the causes of these seismic motions are to be found in local tectonic circumstances. However, the author after investigations lasting many years, stated the main source of these motions to be much deeper and more extended. Between the Dinar and Pind mountain blocks on ground and blocks in the floor of the joining Adriatic bottom, exist in a certain degree steady relationship.In the course of time the stability under the influence of permanent motions the earth crust, gradually turns into labil state, and this is connected with the tendency of labil blocks into labil state, and this is connected with the tendency of labil blocks to be set again into a stabil position. The causes of Skutari seismic motions are resulting from the lability of land and submarine Adriatic blocks, and at any rate of local tectonic reasons.The fact, that microseismic waves of Skutari catastrophes were spread over great distances over 6700 km (1.VI.1905) suggests the cause of these catastrophe to be much more profound, and to be found on the isostatic, probably in still bigger depth. Such deep isostatic motions provoke superficial perturbations and demonstrate from time to time considerable seismic catastrophes.     

On the Possible Observations of Intergalactic or Halo Clouds in Optical Emission

The discussion of the problems of observation of tenuous intergalactic and/or halo clouds in recombination emission is presented. We elaborate the possibility that clouds are illuminated only by metagalactic ultraviolet radiation flux, and assume some plausible values for the parameters determining the physical conditions in such objects. A simple, semiqualitative approach may give specific observational predictions for the two major signposts of fluorescent emission: Ly and H lines. We conclude that H detection of Lyman-limit systems at low redshift is within present observational capabilities. Open questions for further research are put in a convenient framework.