Precession-nutation torque in terms of the stokes constants

um nu-mau m nuuau u auumu m nm ma u. m mu u¶rt;uu¶rt;a m ma nuua u uu.     

The planetary system and solar-terrestrial phenomena

Summary The Sun moves at different distances round the barycentre of the Solar System with different velocities depending on the distribution of the planets. The mean period of the Sun's motion round the barycentre of 11.8627 years and its time variability were observed. A relation between the basic period of 178.4 years and other periods p_i in the Sun's motion (p_i=178.4/i; i=1, 2, ...) was found. The consistency of the periods in the Sun's motion round the barycentre with the periods of different solar-terrestrial phenomena was studied. It seems that the planetary system governs these phenomena.

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n¶rt; ¶rt;u nu¶rt; au a ama um (11,8627 m) u auauu. a a¶rt;a nuua ¶rt; m¶rt;u nu¶rt;au ¶rt;uu a (p_i=178,4/i). mu nu¶rt;a u nma nu¶rt; n¶rt; a - u. na¶rt;u nu¶rt; am, m a uma nam mu u.

     

On the calculation of the gravity terrain corrections in Czechoslovakia

Summary A calculation of the gravity terrain corrections by computer is proposed.

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¶rt;aam m¶rt; uuu mnauu nna unau uuum muu.

     

Stress in the lithosphere generated by terrain topography and density inhomogeneities in the earth's crust

Summary The methods are described and results presented of computing the two-dimensional stress field in a particular section of International Geotraverse I. The present effects of loads, caused by terrain topography and density inhomogeneities in the Earth's crust, were considered to be the sources of the stress. The corresponding values of the deviatoric stresses in the area considered are of the order of 5 MPa.

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nuaa m¶rt;ua u mam ama ¶rt; n anu a am ¶rt;a¶rt;maaI. muau anu m m uu a m a mmu u m nmm ¶rt;¶rt;m . mmmu ¶rt;uam anu ¶rt;muam uu n¶rt;a 5 a.

     

Thermostat for the sharpe CG-2 gravimeter

Summary Gravimeters with a quartz system display a considerable temperature dependence. A simple thermostat for the Sharpe CG-2 gravimeter, eliminating this drawback, is described.Dedicated to Academician Alois Zátopek on His 65th Birthday     

The mean density of the earth

Résumé La densité moyenne de la Terre et la densité moyenne de la couche superficielle, jusqu'à1450 m, furent déterminées `a partir des observations du gradient vertical de la pesanteur, dans la mine Anna à Píbram. Les calculs furent effectués selon les formules(6) et(7), déduites sous la supposition que la Terre soit un ellipsoïde de révolution. Les résultats furent comparés aux valeurs déduites pour l'ellipsoïde astronomique et aux valeurs des densités obtenues des prises de roches dans la mine et on a constaté un bon accord.     

Mineral and chemical composition of the Jezersko meteorite—A new chondrite from Slovenia

The Jezersko meteorite is a newly confirmed stony meteorite found in 1992 in the Karavanke mountains, Slovenia. The meteorite is moderately weathered (W2), indicating short terrestrial residence time. Chondrules in partially recrystallized matrix are clearly discernible but often fragmented and have mean diameter of 0.73 mm. The meteorite consists of homogeneous olivine (Fa_19.4) and low‐Ca pyroxenes (Fs_16.7Wo_1.2), of which 34% are monoclinic, and minor plagioclase (Ab₈₃An₁₁Or₆) and Ca‐pyroxene (Fs₆Wo_45.8). Troilite, kamacite, zoned taenite, tetrataenite, chromite, and metallic copper comprise about 16.5 vol% of the meteorite. Phosphates are represented by merrillite and minor chlorapatite. Undulatory extinction in some olivine grains and other shock indicators suggests weak shock metamorphism between stages S2 and S3. The bulk chemical composition generally corresponds to the mean H chondrite composition. Low siderophile element contents indicate the oxidized character of the Jezersko parent body. The temperatures recorded by two‐pyroxene, olivine‐chromite, and olivine‐orthopyroxene geothermometers are 854 °C, 737–787 °C, and 750 °C, respectively. Mg concentration profiles across orthopyroxenes and clinopyroxenes indicate relatively fast cooling at temperatures above 700 °C. A low cooling rate of 10 °C Myr^?1 was obtained from metallographic data. Considering physical, chemical, and mineralogical properties, meteorite Jezersko was classified as an H4 S2(3) ordinary chondrite.     

Reorganization of continent-scale sediment routing based on detrital zircon and rutile multi-proxy analysis

The duration and extent of sediment routing systems are intrinsically linked to crustal- to mantle-scale processes. Therefore, distinct changes in the geodynamic regime may be captured in the detrital record. This study attempts to reconstruct the sediment routing system of the Canning Basin (Western Australia) during the Early Cretaceous to decipher its depositional response to Mesozoic-Cenozoic supercontinent dispersal. Specifically, we reconstruct source-to-sink relationships for the Broome Sandstone (Dampier Peninsula) and proximal modern sediments through multi-proxy analysis of detrital zircon (U–Pb, Lu–Hf and trace elements) and detrital rutile (U–Pb and trace elements). Multi-proxy comparison of detrital signatures and potential sources reveals that the majority of the detrital zircon and rutile grains are ultimately sourced from crystalline basement in central Australia (Musgrave Province and Arunta region) and that proximal sediment supply (i.e., Kimberley region) is negligible. However, a significant proportion of detritus might be derived from intermediate sedimentary sources in central Australia (e.g., Amadeus Basin) rather than directly from erosion of crystalline basement. Broome Sandstone data are consistent with a large-scale drainage system with headwaters in central Australia. Contextualization with other broadly coeval drainage systems suggests that central Australia acted as a major drainage divide during the Early Cretaceous. Importantly, reorganization after supercontinent dispersal is characterized by the continuation of a sediment pathway remnant of an earlier transcontinental routing system originating in Antarctica that provided a template for Early Cretaceous drainage. Review of older Canning Basin strata implies a prolonged denudation history of central Australian lithologies. These observations are consistent with the long-lived intracontinental tectonic activity of central Australia governing punctuated sediment generation and dispersion more broadly across Australia and emphasize the impact of deep Earth processes on sediment routing systems.