Mineralogische Untersuchungen an drei Bodenprofilen: auf Zeehsteinletten,Unterem Buntsandstein und Zechsteindolomit     

Dr. Helmut Nordmeyer 《Contributions to Mineralogy and Petrology》1959,7(1):1-44

Zusammenfassung Drei Waldbodenprofile auf Zechsteinletten, Unterem Buntsandstein und Zechsteindolomit am südwestlichen Harzrand wurden mit Hilfe von Korngrößenanalysen, optischen und röntgenographischen Methoden auf ihren qualitativen und quantitativen Mineralbestand untersucht. Außerdem konnte anhand von Bodendünnschliffen ein Einblick in die Mikromorphologie der in ihrer Lagerung nicht gestörten Bodenhorizonte gewonnen werden. Dabei ließen sich mit dem Mikroskop nicht mehr auflösbare Strukturelemente auf röntgenographischem Wege aus dem Dünnschliff heraus identifizieren.  相似文献   

Analyse der sonnenwinddaten von pionier VI     

Helmut Pichler 《Meteorology and Atmospheric Physics》1970,19(2):187-194

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Eine neue Interpretation der vertikal integrierten Bewegungsgleichungen     

Prof. Dr. Helmut Pichler 《Meteorology and Atmospheric Physics》1970,19(3):311-316

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Computer simulation of second order faults     

Helmut Bock 《Rock Mechanics and Rock Engineering》1971,3(4):225-238

SummaryComputer Simulation of Second Order Faults Faults of the second order can be simulated in the computer with an accuracy hitherto unknown, by using Malina's (1969, 1970) program version of the Finite Element Method. The computations show that stress rearrangements occur with shear movements along the principal fault and with propagation of the fault. These stress rearrangements contribute to the development of new secondary faults. The computed second order faults can be classified according to Chinnery (1966) as shear plane typesA, B, E, andF. Moreover, the computation shows two dominant shear planes which cannot be classified according to Chinnery.

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ZusammenfassungSimulation von Störungen zweiter Ordnung im Computer Störungen zweiter Ordnung lassen sich mit einer bisher noch nicht gekannten Genauigkeit mit Hilfe einer von Malina (1969, 1970) entwickelten Programmversion der Finite-Element-Methode im Computer simulieren. Die Rechnungen zeigen, daß mit einer Scherbewegung entlang der Hauptstörung und dem Weiterreißen der Störung Spannungsumlagerungen einhergehen, die mitbewirken, daß neue sekundäre Störungen entstehen. Die ermittelten Störungen zweiter Ordnung lassen sich nach der Klassifikation von Chinnery (1966) als die ScherflächentypenA, B, E undF einordnen. Darüberhinaus liefert die Rechnung zwei sehr häufig auftretende Scherflächen, die sich nach Chinnery nicht klassifizieren lassen.

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RésuméSimulation de failles de deuxième ordre par l'ordinateur Les failles de deuxième ordre peuvent être simulées avec une précision encore jamais atteinte grâce à l'utilisation d'une version d'une programme développé par Malina (1969, 1970) à partir de la méthode des éléments finis. Le calcul montre que, conjointement au cisaillement le long de la faille principale et à la propagation de cette faille, de nouvelles redistributions des contraintes apparaissent. Ces nouvelles redistributions contribuent essentiellement au développement de nouvelles surfaces de failles secondaires. Les failles de deuxième ordre peuvent être classées d'après Chinnery (1966) suivant les catégories de surfaces de cisaillementA, B, E, etF. De plus, le calcul indique fréquemment deux autres types de surfaces de cisaillement n'entrant pas dans la classification de Chinnery.

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With 11 Figures  相似文献   

Ein Beitrag zum Wärme- und Strahlungshaushalt im Himalaya-Gebirge     

Dr. Helmut Kraus 《Meteorology and Atmospheric Physics》1971,20(2):175-182

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On the theory of cyclogenesis in middle latitudesZur theorie der zyklonenbildung in den mittleren breitenSur la théorie de la cyclogénèse dans les latitudes moyennes     

Helmut Pichler 《Geoforum》1973,4(2):7-10

The author gives a short introduction into theories of cyclogenesis which are based on instability. The polarfront and baroclinic instability theories are discussed along with the difference between linear and non-linear instability. The author stresses that one may consider cyclogenesis from the point of view of the production of cyclonic vorticity. The terms responsible for the production of vorticity become increasingly important as soon as the horizontal and vertical wind shear as expressed by the Rossby and Richardson numbers reach a critical combination. This critical combination can be reached more easily if heat of condensation is set free than with purely dry-adiabatic processes. Therefore, cyclogenesis is more easily possible in saturated air than in non-saturated air.  相似文献   

地下闭式循环地热交换发电系统简介     

周刚  李金锋  Helmut WOLFF  汤凤林 《地质科技情报》2006,25(4):105-108

为解决能源问题而提出了地下闭式循环地热交换发电系统.该系统地下部分通过全井下套管形成一个封闭系统,克服了传统地热发电和干热岩发电受地质条件制约、对环境造成危害等缺点,是一种新型的不依赖位置、环境友好的地热发电系统.采用大位移技术进行钻井,应用悬链线技术对井身剖面结构进行了优化,提出了地下连接技术要求,应用分支井和膨胀套管技术固井,设计了水泥配方并进行了相关试验,优化了载热流体,计算了有机工质朗肯循环(ORC)的发电效率.  相似文献   

Eo-alpine metamorphism in the uppermost unit of the Cretan nappe system — Petrology and geochronology     

Eberhard Seidel  Martin Okrusch  Hans Kreuzer  Helmut Raschka  Wilhelm Harre 《Contributions to Mineralogy and Petrology》1981,76(3):351-361

The uppermost unit of the Cretan nappe system consists of ophiolites on the top, and an ophiolitic mélange at the base.Among the various constituents of the mélange, there are slices of low-P/high-T metamorphics. They form a variegated series consisting of tholeiitic ortho-amphibolites, para-amphibolites, andalusite and sillimanite-cordierite-garnet bearing mica schists, calcsilicate rocks, and marbles. The metamorphic sequence is locally intruded by early tectonic magmatites of gabbroic, dioritic and granitic composition. Critical mineral assemblages lead to a maximum temperature of about 700° C reached during metamorphism, at a total pressure of 4–5 kilobars. K — Ar dating on 6 hornblendes, 7 biotites and 1 muscovite yielded cooling ages of 75–66 m.y. and confirmed earlier results according to which the metamorphism and related magmatism took place in Late Cretaceous times.In order to evaluate the age relationships between the hightemperature metamorphics within the ophiolitic mélange and the ophiolites, hornblendes from ultramafic and mafic rocks of the ophiolite complex were dated by the K — Ar method. Hornblende from one schistose hornblendite forming a constituent of the ophiolites proper yielded 156 m.y. and thus provides a middle Jurassic minimum age for the formation of this piece of oceanic lithosphere. Four hornblendes of calc-alkaline gabbrodiorite dikes within the ophiolite complex gave distinctly lower K — Ar dates of about 140 m.y.. The dikes probably intruded after the detachment of the ophiolites in an island-arc or continental-margin environment.As a consequence, the high-temperature metamorphics and related intrusives in the ophiolitic mélange of Crete are genetically unrelated to the overlying ophiolites. The paleogeographic position of the crystalline terrane, slices of which are now incorporated into the ophiolitic mélange is still open to discussion.  相似文献   

Einige Probleme des Variszikums von Neo-Europa     

Prof. Dr. Helmut W. Flügel 《International Journal of Earth Sciences》1975,64(1):1-62

The Periadriatic Lineament and its possible extension, the Balatonline, on the one hand and the Balcan-Dinaric Lineament and its continuation (?) the Zagreb-line, on the other hand, separate an outer-region, characterized by clastic, terrestrical Upper Carboniferous and Permian strata, from a marine Inner-region. This Inner-region includes the Southern Alps, the Dinarides, and the ?Igoler“-trough. The aforementioned lineaments were not evident during the Lower Paleozoic, whereas in the Upper Paleozoic (after the Variscan orogenese) a clear separation of the two areas can be seen. As a consequence of the overlapping of the marine sequence into the regions north of the Periadriatic lineaments during the Triassic, the contrast between outer- and inner-regions are agained wiped out. For a full understanding of these facts, significant details are still missing. Above all it is important to find a solution for several still unanswered questions: how far the outer region is still a part of the paleomagnetic “Stabile Europe”; how far the metamorphic development within the region of the Balcan Peninsula, the Pannonic Basin and the Karpates can be compared with the ideas (supported by isotopic-geological dates) of the metamorphic development on both sides of the Insubric line and also how far the Dinaric Ophiolite zones are remains of a Paleothetys. Only when these questions are answered will it be possible to insert the Variscan area into the discussion of plate-tectonics within the Neo-European region.  相似文献   

¹⁴C age and vertical mixing of deep-sea sediments     

Helmut Erlenkeuser 《Earth and Planetary Science Letters》1980,47(3):319-326

Vertical mixing models applied to the radiocarbon age stratigraphy of sediments have to make allowance for the presumably non-vanishing zero-age of the sedimentary particulates freshly arriving at the sediment surface. The appropriate modifications of the simple box model recently presented by Berger and Johnson are outlined. For seven deep-sea cores, zero-age values are found varying between 0.1 and 1.4 kyr. A high zero-age is likely to be indicative for redistribution processes occurring at the sea floor. The box model has been extended to make allowance for a change of sedimentation rate in the depositional interval under study.  相似文献