Compton Scattering in Plane Media: Polarization of Radiation and Azimuth Independence. I. Theory

Astrophysics - Compton scattering of polarized radiation by a nondegenerate and unpolarized electron gas is examined. Two polarization bases are introduced for pulses of photons: external,...     

Die stratiforme Sulfidlagerstätte Walchen,Steiermark, Österreich: Geochemie und Genese

Zusammenfassung Die Neubearbeitung derstratiformen Sulfidlagerstätte Walchen bei Öblarn, Steiermark, offen-bart eine eisenbetonte submarin-exhalative Metallkonzentration in einem vulkano-sedimentären Rahmen. Dieser liegt heute in Form metamorpher Gesteine der untersten Grünschieferfazies vor. Mineralchemische Untersuchungen zeigen, daß die ehemalige intensivste metamorphe Überprägung der Lagerstätte im Bereich von 450°–500°C oberhalb 4 kb stattgefunden hat. Metavulkanite, vertreten durch Grünschiefer, lassen alkalibasaltische Affinität erkennen. Die vulkano-tektonische Position der Lagerstätte ist in einem intrakontinentalen Riftsystem zu sehen.

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The stratiform sulphide deposit at walchen, styria, austria: Geochemistry and genesis

Summary The Walchen deposit consists of a 1–2 m thick layer of massive to disseminated pyrite-pyrrhotite-chalcopyrite ore with an average grade of 1% Cu. It has been mined intermittently in the past. The ore horizon occurs within sericitic and quartzitic phyllites which carry intercalations with significant carbonate, garnet and graphite contents. The succession is of lower Paleozoic age and forms part of the Grauwackenzone, a volcano-sedimentary unit which separates the Central Alps from the Northern Calcareous Alps.The precursor rocks of the ore environment have been pelites and sandstones; greenschists occur in the hanging wall of the mineralization. Major and trace element analyses of greenschists reveal them as low-grade metamorphic equivalents of continental alkali basalts. Hydrothermal systems generated by volcanic activity were responsible for deposition of stratiform sulphides. The predominance of clastic sediments and the absence of stringer zones point towards a shallow depositional basin.Microprobe analyses of garnets from the ore environment reveal an increase in spessartine contents from 7 mol% in phyllites to 20 mol% in the vicinity of the ore horizon. Similar data have been reported from other stratabound base metal deposits (Broken Hill, N.S.W.; Kreuzeck Mountains, Austria; Gamsberg, South Africa); the manganese concentrations represent fossil manganese haloes.Pyrite carries minor Ni and Co (up to 0.03, respectively 0.3%), pyrrhotite averages 0.8% Ni and 0.1% Co, Fe-contents of sphalerite vary from 6.41–9.33%; Cd, In and Mn have not been recorded.Garnet-biotite pairs suggest maximum metamorphic temperatures of 450°–500°C: pressures of 4 to 5 kb have been estimated. The Walchen deposit is interpreted as the product of submarine exhalative processes in an incipient rift. It was affected by prograde metamorphism during the Variscan orogeny, and by retrograde affects during a later event. Isochemical metamorphism resulted in the preservation of a primary manganese halo.

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Mit 6 Abbildungen     

On fundamental geology and physical origins

Geology must consider the physical processes involved in the genesis of inorganic matter. These processes are ultimately based on cosmogony and cosmology and the associated physics and mathematics of these origins.The approach to genesis impinges on the unknown where a feeling that something finite, and possibly real, exists. The evidence of the unknown must then be compared with the experimental and observed evidence to create a framework from which certain conclusions can be made.The thoughts on genesis and the geological implications are discussed briefly in two parts. Part one includes the basic philosophy, the mathematical and physical concepts; it outlines the philosophy of time, zero and infinity, mass, space, and the mass environments, based on this a ring hypothesis of planetary origins is developed. Part two discusses basic problems of structural geology, fundamental tectonics, the development of continents and continental drift, climatic changes, seismicity, and paleomagnetics.The conclusions drawn from the discussion are: mass ormatter can exist in five states. Continental buttresses are largely made up of rocks of secondary igneous origin. The core of the earth is made of solar (meteoric) material rather than pure nickel-iron. Continents move under differential density forces which ultimately result in a slow twist or rotation of the earth's outer layers about the core. This rotation causes climatic changes and the many paths observed in tracing polar wandering by paleomagnetics.

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Zusammenfassung Dieser Aufsatz versucht, fundamentale geologische Grenzprobleme in Beziehung zu bringen mit fundamentaien physikalischen und astronomischen Problemen, die ihrerseits z. T. noch einer Lösung harren.Ausgehend von einer Betrachtung der Herkunft von Masse, Universum und Sonnensystem werden Probleme der Kontinentalgenese, Kontinentalwanderung, hydrostatischer Druck auf und in Kontinenten, Orogenese, Klimaänderungen und Paläomagnetik in geologischer Zeit besprochen.Der Aufsatz besteht aus zwei Teilen, einem physikalischen und einem geologischen, die zu einem gewissen Grade unabhängig voneinander gelesen werden können. Für ein fruchtbares Verstehen ist es aber ratsam, beide Teile zu lesen. Mathematik ist auf das notwendigste beschränkt.Am Ausgangspunkt der Betrachtung steht die Idee von einem fundamentalen (letztlichen) Masse-Medium, da dieses die Grenze der Erkenntnis bildet.

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Résumé La géologie doit considérer le processus physique entraîné dans la genèse de matière inorganique. Ce processus est finalement basé sur la cosmogonie et cosmologie, ainsi que la physique associée et mathématiques de ces originesL'approche de la genèse se heurte à l'inconnu où le sentiment de quelque chose de fini et peut-être bien réel existe. L'évidence de l'inconnu doit alors être comparée à l'évidence expérimentale et observée, pour créer une structure de laquelle certaines conclusions peuvent être tirées.Les réflexions sur la genèse et les implications géologiques sont exposées brièvement en deux parties. La première partie comprend la philosophie fondamentale, les idées générales de mathématique et physique; elle esquisse la philosophie du temps, zéro et infini, masse, espace et environnements de la masse; basée là-dessus, une hypothèse en cercle des origines planétaires est développée. La seconde partie expose les problèmes fondamentaux de géologie structurale, tectoniques fondamentales, le développement des continents et le mouvement de ceux-ci, changements de climat, séismicité et paléomagnétiques.Les conclusions tirées de l'exposé sont que masse ou matière peuvent exister dans cinq états. Les contreforts continentaux sont en grande partie formés de roche pyrogène secondaire. Le noyau de la terre est fait de matière solaire (météorique) plutôt que de nickel-fer pur. Les continents se déplacent sous des forces de densité différentielle qui résultent finalement dans une torsion lente ou rotation des couches extérieures de la terre autour du noyau. Cette rotation provoque des changements climatique et les nombreuses voies observées en traçant les écarts polaires par paléomagnétique.

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Reconstruction of the harmonic component of the magnetic field modulus anomalies

An algorithm is proposed for calculating a harmonic function equal to the projection of the anomalous magnetic field vector onto the normal field direction from in situ measurements of the anomalous magnetic field modulus (the scalar magnetic anomaly) ΔT, which is a nonharmonic function and is nonlinearly related to the magnetization of anomaly sources. It is shown that the inferred estimates tend to the desired harmonic function if the iterative algorithm converges. The convergence conditions and stability of the process are studied numerically in a wide range of amplitudes of the anomalous field. The results of the modeling simulation demonstrate the efficiency of the proposed algorithm in solving magnetic field interpretation problems often encountered in practice.     

Contaminant concentrations in sport fish from San Francisco Bay, 1997

In 1997, seven sport fish species were sampled from seven popular fishing areas in San Francisco Bay. Mercury exceeded a human health screening value in 44 of 84 (52%) samples. All collected samples of leopard shark and striped bass exceeded the mercury screening value of 0.23 microg/g wet weight. PCBs exceeded the screening value in 51 of 72 (71%) samples. DDT, chlordane, and dieldrin, had lower numbers of samples above screening values: 16 of 72 (22%) for DDT, 11 of 72 (15%) for chlordanes, and 27 of 72 (37%) for dieldrin. Concentrations of PCBs and other trace organics were highest in white croaker and shiner surfperch, the two species with the highest fat content in their muscle tissue. Fish from one location, Oakland Harbor, had significantly elevated wet weight concentrations of mercury, PCBs, DDTs, and chlordanes compared to other locations. Removal of skin from white croaker fillets reduced lipid concentrations by 27-49% and concentrations of trace organics by 33-40%.     

Wet deposition of excess sulfate at Macquarie Island, 54° S

Annual wet deposition of excess sulfate at Macquarie Island has been estimated from 5 months of rainwater composition data covering the Austral summer of 1985/86. The resulting figure of 2.1±0.6 mmol/m²/yr is at the low end of previous estimates of maritime excess sulfate deposition by precipitation. Within estimated uncertainty limits this figure is consistent with the DMS emission flux which would be predicted for latitude 50°–60° S, based solely on available Northern Hemispheric DMS measurements.Temporarily at the International Meteorological Institute, Stockholm University, S-106 91, Stockholm, Sweden.     

Lithologische Studien und zyklische Sedimentation in der helvetischen Zone der Schweizeralpen

Ohne Zusammenfassung     

Cesstibtantite—a geologic introduction to the inverse pyrochlores

Summary The crystal structure of cesstibtantite has been solved from diffractometer data collected on samples from Leshaia, Russia and the Tanco pegmatite, Manitoba. Cesstibtantite from the Leshaia pegmatite (type locality) hasa 10.515(2) Å, space groupFd3m, composition Cs_0.31(Sb_0.57Na_0.31Pb_0.02Bi_0.01)_O.91(Ta_1.88Nb_0.12)₂(O_5.69[OH, F]_0.31)₆(OH, F)_0.69, Z 8; its structure was refined toR 3.8,wR 4.3% using 96 observed (F > 3[F]) reflections (MoK). Cesstibtantite from the Tanco pegmatite hasa 10.496(1) Å, space groupFd3m, composition (Cs_0.22K_0.01)_0.23(Na_0.45Sb_0.39Pb_0.14· Ca_0.06Bi_0.02)_1.06(Ta_1.95Nb_0.05)₂(O_5.78[OH,F]_0.22)₆(OH,F)_0.55,Z 8; its structure was refined toR 3.9w R 3.7% using 104 observed reflections. Cesstibtantite differs from the normal pyrochlores in that it contains significant amounts of very large cations such as Cs. As these cations are too large (^VIII[r] > 1.60 Å) for the conventional [8]-coordinated A site, they occupy the [18]-coordinated site, which normally contains monovalent anions. Natural cesstibtantite samples are non-ideal in that both Cs and monovalent anions occur at the site; thus cesstibtantite is intermediate to thenormal pyrochlores (with only monovalent anions at the site) and theinverse pyrochlores (with only large cations at the site).

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Cesstibtantit—eine geologische Einfiihrung in die inversen Pyrochlore

Zusammenfassung Die Kristallstruktur von Cesstibtantit wurde auf der Basis von Diffraktometerdaten von Proben von Leshaia, Russland and dem Tanco Pegmatit, Manitoba, gelöst. Cesstibtantit aus dem Leshaia Pegmatit (Typlokalität) hat a 10.515(2) Å, RaumgruppeFd3m, die Zusammensetzung CS_0.31(Sb_0.57Na_0.31Pb_0.02Bi_0.01)_0.91(Ta_1.88Nb_0.12)₂· (O_5.69OH, F_0.31)₆(OH, F)_0.69 Z 8; die Struktur wurde aufR 3.8,wR 4.3% verfeinert unter Benützung von 96 beobachteten Reflexen. Cesstibtantit vom Tanco Pegmatit hat a 10.496(1) Å, RaumgruppeFd3m, die Zusammensetzung (Cs_0.22K_0.01)_0.23(Na_0.45· Sb_0.39Pb_0.14Ca_0.06Bi_0.02)_1.06(Ta_1.95Nb_0.05)₂(O_5.78OH,F_0.22)₆(OH,F)_0.55,Z 8; seine Struktur wurde aufR 3.9wR 3.7% auf der Basis von 104 beobachteten Rettexen verfeinert. Cesstibtantit unterscheidet sich von normalen Pyrochloren insofern, als er signifikante Mengen von sehr großen Kationen, wie z.B. Cs enthält. Da these Kationen zu groß sind (^VIII r 1.60 Å) für eine konventionelle [8]-koordinierteA Stelle, nehmen she die [18]-koordinierten Positionen ein, welche normalerweise monovalente Anionen enthalten. Natürliche Cesstibtantitproben sind nicht ideal insofern als sowohl Cs als auch monovalente Anionen in der Position vorkommen. Somit ist Cesstibtantit intermediär zu den normalen Pyrochloren (mit nur monovalenten Anionen auf der Position) and den inversen Pyrochloren (mit ausschließlichen großen Kationen an der Position).