TY - THES A1 - Böhme, Dimo T1 - EU-Russia energy relations: What chance for solutions? : A focus on the natural gas sector T1 - Energiebeziehungen EU-Russland : Welche Lösungen sind möglich? N2 - Public debate about energy relations between the EU and Russia is distorted. These distortions present considerable obstacles to the development of true partnership. At the core of the conflict is a struggle for resource rents between energy producing, energy consuming and transit countries. Supposed secondary aspects, however, are also of great importance. They comprise of geopolitics, market access, economic development and state sovereignty. The European Union, having engaged in energy market liberalisation, faces a widening gap between declining domestic resources and continuously growing energy demand. Diverse interests inside the EU prevent the definition of a coherent and respected energy policy. Russia, for its part, is no longer willing to subsidise its neighbouring economies by cheap energy exports. The Russian government engages in assertive policies pursuing Russian interests. In so far, it opts for a different globalisation approach, refusing the role of mere energy exporter. In view of the intensifying struggle for global resources, Russia, with its large energy potential, appears to be a very favourable option for European energy supplies, if not the best one. However, several outcomes of the strategic game between the two partners can be imagined. Engaging in non-cooperative strategies will in the end leave all stakeholders worse-off. The European Union should therefore concentrate on securing its partnership with Russia instead of damaging it. Stable cooperation would need the acceptance that the partner may pursue his own goals, which might be different from one’s own interests. The question is, how can a sustainable compromise be found? This thesis finds that a mix of continued dialogue, a tit for tat approach bolstered by an international institutional framework and increased integration efforts appears as a preferable solution. N2 - Die öffentliche Debatte über die Energiebeziehungen Russlands und der EU ist verzerrt. Diese Verzerrungen verhindern die Entwicklung einer wirklichen Energiepartnerschaft. Kern des Konflikts ist ein Kampf um Rohstoffrenten zwischen Energie produzierenden, Energie konsumierenden und Transitstaaten. Dabei sind scheinbar nebensächliche Aspekte wie geopolitische Überlegungen, Marktzutrittsbedingungen, wirtschaftliche Entwicklung und staatliche Souveränität, die kaum Beachtung finden, von umso größerer Bedeutung. Die EU, die ihre Energiemärkte liberalisiert, sieht sich einer wachsenden Lücke zwischen abnehmenden eigenen Ressourcen und stetig steigender Energienachfrage gegenüber. Vielfältige Interessen innerhalb der Union verhindern die Definition einer kohärenten und allgemein akzeptierten Energiepolitik. Russland seinerseits ist nicht länger gewillt, die Volkswirtschaften seiner Nachbarstaaten mit billigen Energieexporten zu subventionieren. Die russische Regierung verfolgt russische Interessen, und tut dies durchaus mit Nachdruck. Insofern, als dass sie für Russland selbst mehr als die Rolle eines bloßen Energieexporteurs wünscht, verfolgt sie auch eine eigene Herangehensweise an die Globalisierung. Vor dem Hintergrund des zunehmenden globalen Wettstreits um Ressourcen erscheint Russland mit seinem großen Energiepotential als sehr vorteilhafte, wenn nicht sogar die beste Option für die europäische Energieversorgung. In einem solchen strategischen Spiel der beiden Partner sind grundsätzlich verschiedene Ergebnisse vorstellbar. Wählen beide nichtkooperative Strategien, so verlieren letztlich alle Beteiligten. Die EU sollte sich deshalb darauf konzentrieren, ihre Partnerschaft mit Russland zu intensivieren, anstatt sie zu beschädigen. Eine verlässliche Kooperation setzt dabei die Akzeptanz voraus, dass der Partner seine eigenen Ziele verfolgt, die durchaus verschieden von EU-Interessen sein können. Die Frage ist, wie ein dauerhaft tragfähiger Kompromiss gefunden werden kann. Diese Arbeit argumentiert im Sinne einer Kombination aus fortgeführtem Dialog, einer tit-for-tat Strategie, die von einem internationalen institutionellen Rahmenwerk begleitet wird sowie verstärkten Integrationsbemühungen. KW - EU KW - Russland KW - Energie KW - Gas KW - Kooperation KW - Rohstoffe KW - EU KW - Russia KW - energy KW - gas KW - cooperation KW - resources Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-50210 SN - 978-3-86956-120-2 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - BOOK A1 - Böhme, Dimo T1 - EU-Russia energy relations: What chance for solutions? : A focus on the natural gas sector N2 - Public debate about energy relations between the EU and Russia is distorted. These distortions present considerable obstacles to the development of true partnership. At the core of the conflict is a struggle for resource rents between energy producing, energy consuming and transit countries. Supposed secondary aspects, however, are also of great importance. They comprise of geopolitics, market access, economic development and state sovereignty. The European Union, having engaged in energy market liberalisation, faces a widening gap between declining domestic resources and continuously growing energy demand. Diverse interests inside the EU prevent the definition of a coherent and respected energy policy. Russia, for its part, is no longer willing to subsidise its neighbouring economies by cheap energy exports. The Russian government engages in assertive policies pursuing Russian interests. In so far, it opts for a different globalisation approach, refusing the role of mere energy exporter. In view of the intensifying struggle for global resources, Russia, with its large energy potential, appears to be a very favourable option for European energy supplies, if not the best one. However, several outcomes of the strategic game between the two partners can be imagined. Engaging in non-cooperative strategies will in the end leave all stakeholders worse-off. The European Union should therefore concentrate on securing its partnership with Russia instead of damaging it. Stable cooperation would need the acceptance that the partner may pursue his own goals, which might be different from one’s own interests. The question is, how can a sustainable compromise be found? This thesis finds that a mix of continued dialogue, a tit for tat approach bolstered by an international institutional framework and increased integration efforts appears as a preferable solution. N2 - Die öffentliche Debatte über die Energiebeziehungen Russlands und der EU ist verzerrt. Diese Verzerrungen verhindern die Entwicklung einer wirklichen Energiepartnerschaft. Kern des Konflikts ist ein Kampf um Rohstoffrenten zwischen Energie produzierenden, Energie konsumierenden und Transitstaaten. Dabei sind scheinbar nebensächliche Aspekte wie geopolitische Überlegungen, Marktzutrittsbedingungen, wirtschaftliche Entwicklung und staatliche Souveränität, die kaum Beachtung finden, von umso größerer Bedeutung. Die EU, die ihre Energiemärkte liberalisiert, sieht sich einer wachsenden Lücke zwischen abnehmenden eigenen Ressourcen und stetig steigender Energienachfrage gegenüber. Vielfältige Interessen innerhalb der Union verhindern die Definition einer kohärenten und allgemein akzeptierten Energiepolitik. Russland seinerseits ist nicht länger gewillt, die Volkswirtschaften seiner Nachbarstaaten mit billigen Energieexporten zu subventionieren. Die russische Regierung verfolgt russische Interessen, und tut dies durchaus mit Nachdruck. Insofern, als dass sie für Russland selbst mehr als die Rolle eines bloßen Energieexporteurs wünscht, verfolgt sie auch eine eigene Herangehensweise an die Globalisierung. Vor dem Hintergrund des zunehmenden globalen Wettstreits um Ressourcen erscheint Russland mit seinem großen Energiepotential als sehr vorteilhafte, wenn nicht sogar die beste Option für die europäische Energieversorgung. In einem solchen strategischen Spiel der beiden Partner sind grundsätzlich verschiedene Ergebnisse vorstellbar. Wählen beide nichtkooperative Strategien, so verlieren letztlich alle Beteiligten. Die EU sollte sich deshalb darauf konzentrieren, ihre Partnerschaft mit Russland zu intensivieren, anstatt sie zu beschädigen. Eine verlässliche Kooperation setzt dabei die Akzeptanz voraus, dass der Partner seine eigenen Ziele verfolgt, die durchaus verschieden von EU-Interessen sein können. Die Frage ist, wie ein dauerhaft tragfähiger Kompromiss gefunden werden kann. Diese Arbeit argumentiert im Sinne einer Kombination aus fortgeführtem Dialog, einer tit-for-tat Strategie, die von einem internationalen institutionellen Rahmenwerk begleitet wird sowie verstärkten Integrationsbemühungen. T3 - Potsdam Economic Studies - 3 KW - EU KW - Russland KW - Energie KW - Gas KW - Kooperation KW - Rohstoffe KW - EU KW - Russia KW - energy KW - gas KW - cooperation KW - resources Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-63022 SN - 978-3-86956-278-0 ER - TY - JOUR A1 - Fürstenberg, Nils A1 - Alfes, Kerstin A1 - Kearney, Eric T1 - How and when paradoxical leadership benefits work engagement BT - the role of goal clarity and work autonomy JF - Journal of occupational and organizational psychology / British Psychological Society N2 - Paradoxical leadership behaviour (PLB) represents an emerging leadership construct that can help leaders deal with conflicting demands. In this paper, we report three studies that add to this nascent literature theoretically, methodologically, and empirically. In Study 1, we validate an effective short-form measure of global PLB using three different samples. In Studies 2 and 3, we draw on the job demands-resources model to propose that paradoxical leaders promote followers' work engagement by simultaneously fostering follower goal clarity and work autonomy. The results of survey data from Studies 2 and 3 largely confirm our model. Specifically, our findings show that PLB is positively associated with follower goal clarity and work autonomy, and that PLB exerts an indirect effect on work engagement via these variables. Moreover, our results support a hypothesized interaction effect of goal clarity and work autonomy to predict followers' work engagement, as well as a conditional indirect effect of PLB on work engagement via the interactive effect. We discuss the practical implications for leaders and organizations. Practitioner points To effectively engage followers in their work, leaders should create work environments in which followers know exactly what to do (i.e., have high goal clarity), but at the same time can determine on their own how to do their work (i.e., have high work autonomy) To foster both goal clarity and work autonomy, leaders should combine communal (e.g., other-centred, flexibility-providing) and agentic aspects of leadership (e.g., maintaining decision control and enforcing performance standards). HR departments should design leadership trainings that help leaders to combine seemingly opposing, yet ultimately synergistic behaviours. KW - paradoxical leadership behaviour KW - paradox theory KW - job demands KW - resources KW - model KW - goal clarity KW - work autonomy KW - work engagement Y1 - 2021 U6 - https://doi.org/10.1111/joop.12344 SN - 0963-1798 SN - 2044-8325 VL - 94 IS - 3 SP - 672 EP - 705 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Kuhlicke, Christian A1 - Seebauer, Sebastian A1 - Hudson, Paul A1 - Begg, Chloe A1 - Bubeck, Philip A1 - Dittmer, Cordula A1 - Grothmann, Torsten A1 - Heidenreich, Anna A1 - Kreibich, Heidi A1 - Lorenz, Daniel F. A1 - Masson, Torsten A1 - Reiter, Jessica A1 - Thaler, Thomas A1 - Thieken, Annegret A1 - Bamberg, Sebastian T1 - The behavioral turn in flood risk management, its assumptions and potential implications JF - WIREs Water N2 - Recent policy changes highlight the need for citizens to take adaptive actions to reduce flood-related impacts. Here, we argue that these changes represent a wider behavioral turn in flood risk management (FRM). The behavioral turn is based on three fundamental assumptions: first, that the motivations of citizens to take adaptive actions can be well understood so that these motivations can be targeted in the practice of FRM; second, that private adaptive measures and actions are effective in reducing flood risk; and third, that individuals have the capacities to implement such measures. We assess the extent to which the assumptions can be supported by empirical evidence. We do this by engaging with three intellectual catchments. We turn to research by psychologists and other behavioral scientists which focus on the sociopsychological factors which influence individual motivations (Assumption 1). We engage with economists, engineers, and quantitative risk analysts who explore the extent to which individuals can reduce flood related impacts by quantifying the effectiveness and efficiency of household-level adaptive measures (Assumption 2). We converse with human geographers and sociologists who explore the types of capacities households require to adapt to and cope with threatening events (Assumption 3). We believe that an investigation of the behavioral turn is important because if the outlined assumptions do not hold, there is a risk of creating and strengthening inequalities in FRM. Therefore, we outline the current intellectual and empirical knowledge as well as future research needs. Generally, we argue that more collaboration across intellectual catchments is needed, that future research should be more theoretically grounded and become methodologically more rigorous and at the same time focus more explicitly on the normative underpinnings of the behavioral turn. KW - capacities KW - effectiveness KW - motivation KW - resources KW - risk governance KW - vulnerability Y1 - 2020 U6 - https://doi.org/10.1002/wat2.1418 SN - 2049-1948 VL - 7 IS - 3 SP - 1 EP - 22 PB - Wiley-Blackwell CY - Hoboken ER - TY - GEN A1 - Kuhlicke, Christian A1 - Seebauer, Sebastian A1 - Hudson, Paul A1 - Begg, Chloe A1 - Bubeck, Philip A1 - Dittmer, Cordula A1 - Grothmann, Torsten A1 - Heidenreich, Anna A1 - Kreibich, Heidi A1 - Lorenz, Daniel F. A1 - Masson, Torsten A1 - Reiter, Jessica A1 - Thaler, Thomas A1 - Thieken, Annegret A1 - Bamberg, Sebastian T1 - The behavioral turn in flood risk management, its assumptions and potential implications T2 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - Recent policy changes highlight the need for citizens to take adaptive actions to reduce flood-related impacts. Here, we argue that these changes represent a wider behavioral turn in flood risk management (FRM). The behavioral turn is based on three fundamental assumptions: first, that the motivations of citizens to take adaptive actions can be well understood so that these motivations can be targeted in the practice of FRM; second, that private adaptive measures and actions are effective in reducing flood risk; and third, that individuals have the capacities to implement such measures. We assess the extent to which the assumptions can be supported by empirical evidence. We do this by engaging with three intellectual catchments. We turn to research by psychologists and other behavioral scientists which focus on the sociopsychological factors which influence individual motivations (Assumption 1). We engage with economists, engineers, and quantitative risk analysts who explore the extent to which individuals can reduce flood related impacts by quantifying the effectiveness and efficiency of household-level adaptive measures (Assumption 2). We converse with human geographers and sociologists who explore the types of capacities households require to adapt to and cope with threatening events (Assumption 3). We believe that an investigation of the behavioral turn is important because if the outlined assumptions do not hold, there is a risk of creating and strengthening inequalities in FRM. Therefore, we outline the current intellectual and empirical knowledge as well as future research needs. Generally, we argue that more collaboration across intellectual catchments is needed, that future research should be more theoretically grounded and become methodologically more rigorous and at the same time focus more explicitly on the normative underpinnings of the behavioral turn. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1440 KW - capacities KW - effectiveness KW - motivation KW - resources KW - risk governance KW - vulnerability Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-517696 SN - 1866-8372 IS - 3 ER - TY - JOUR A1 - Przybylla, Mareen A1 - Romeike, Ralf T1 - Empowering learners with tools in CS education BT - physical computing in secondary schools JF - it - Information Technology N2 - In computer science, computer systems are both, objects of investigation and tools that enable creative learning and design. Tools for learning have a long tradition in computer science education. Already in the late 1960s, Papert developed a concept which had an immense impact on the development of informal education in the following years: his theory of constructionism understands learning as a creative process of knowledge construction that is most effective when learners create something purposeful that they can try out, show around, discuss, analyse and receive praise for. By now, there are numerous learning and programming environments that are based on the constructionist ideas. Modern tools offer opportunities for students to learn in motivating ways and gain impressive results in programming games, animations, implementing 3D models or developing interactive objects. This article gives an overview of computer science education research related to tools and media to be used in educational settings. We analyse different types of tools with a special focus on the categorization and development of tools for student adequate physical computing activities in the classroom. Research around the development and evaluation of tools and learning resources in the domain of physical computing is illustrated with the example of "My Interactive Garden", a constructionist learning and programming environment. It is explained how the results from empirical studies are integrated in the continuous development of the learning material. KW - tools KW - media KW - resources KW - computer science education KW - physical computing Y1 - 2018 U6 - https://doi.org/10.1515/itit-2017-0032 SN - 1611-2776 SN - 2196-7032 VL - 60 IS - 2 SP - 91 EP - 101 PB - De Gruyter CY - Berlin ER - TY - JOUR A1 - Schulz, Anika D. A1 - Schöllgen, Ina A1 - Fay, Doris T1 - The role of resources in the stressor–detachment model JF - International journal of stress management N2 - A recent extension of the stressor-detachment model holds that the path running from job stressors via psychological detachment to impairment of well-being is moderated by both personal and job resources (Sonnentag & Fritz, 2015). The aim of the present study was to test this proposition by investigating the moderating role of one personal resource and one job resource (i.e., coworker social support and general self-efficacy, respectively) on the linkage between different job stressors (i.e., workload and role ambiguity), detachment, and well-being. Hypotheses were tested with structural equation modeling using data from a representative survey of the German workforce (N = 3,937 employees, M-age = 46.5 years, 47.5% women). In agreement with previous findings, the results showed that psychological detachment mediated the negative effects of job stressors on well-being. Social support from coworkers buffered the mediation such that the conditional indirect effects of workload and role ambiguity on well-being via detachment were weaker at higher levels of support. General self-efficacy did not moderate the stressor-well-being linkage. These results imply that social support can be considered as a protective factor that helps employees maintain their well-being by alleviating the negative effects of job stressors on their ability to switch off mentally from work. KW - psychological detachment KW - resources KW - social support KW - self-efficacy KW - job stress Y1 - 2019 U6 - https://doi.org/10.1037/str0000100 SN - 1072-5245 SN - 1573-3424 VL - 26 IS - 3 SP - 306 EP - 314 PB - American Psychological Association CY - Washington ER - TY - THES A1 - Wenzek, Eva T1 - Organisationale Fähigkeiten in Museen : eine explorative Fallstudie T1 - Dynamic capabilities in museums : an explorative case study N2 - Das Konzept der dynamischen Fähigkeiten, das der Forschung zur Privatwirtschaft entspringt, stellt die Frage wie Unternehmen um ihre Ressourcen optimal nutzen zu können, Fähigkeiten entwickeln, durch die sie in der Lage sind, sich stetig zu verbessern. Da sich auch im öffentlichen Sektor die Frage nach einer verbesserten Nutzung und Einsetzung der zur Verfügung stehenden Potentiale stellt, ist es Ziel dieser Arbeit das Konzept der dynamischen Fähigkeiten auf den öffentlichen Sektor und hierein den Untersuchungsgegenstand Museum anzuwenden. Somit werden mithilfe der Durchführung einer explorativen Fallstudie dynamische Fähigkeiten und deren Parameter untersucht und identifiziert. Hierzu wird zuerst das der Arbeit zugrundeliegende theoretische Verständnis des Konzepts dargelegt um darauf aufbauend anhand narrativer Interviews mit Mitarbeitern des Jüdischen Museums Berlin im empirischen Teil der Arbeit das Konstrukt auf den Untersuchungsgegenstand anzuwenden. Durch den somit erlangten detaillierten Einblick können dynamische Fähigkeiten und Faktoren, die sich auf diese auswirken, identifiziert werden. N2 - The dynamic capabilities perspective based on private sector research poses the question how firms can develop capabilities to use and apply their resources in an optimal way to improve business steadily. In the public sector the question concerning the resource configuration of a firm is also enquired about the improvement in usage of internal potential. Therefore the aim of this paper is to transfer the concept of dynamic capabilities to the public sector, in that case with museums as the object of investigation. Hence dynamic capabilities and their parameters are analysed and identified by the use of an explorative case study. Due to that the theoretical background is defined in order to analyse interviews with stuff members of the Jewish Museum Berlin. This gains detailed insights and makes an identification of dynamic capabilities and their parameters possible. T3 - Schriftenreihe für Public und Nonprofit Management - 16 KW - dynamische Fähigkeiten KW - Museum KW - öffentlicher Sektor KW - Fallstudie KW - Ressourcen KW - dynamic capabilities KW - museum KW - public sector KW - case study KW - resources Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-63645 ER - TY - THES A1 - Wolf, Mathias Johannes T1 - The role of partial melting on trace element and isotope systematics of granitic melts T1 - Die Bedeutung partieller Schmelzbildung für die Spurenelement- und Isotopensystematik granitischer Schmelzen N2 - Partial melting is a first order process for the chemical differentiation of the crust (Vielzeuf et al., 1990). Redistribution of chemical elements during melt generation crucially influences the composition of the lower and upper crust and provides a mechanism to concentrate and transport chemical elements that may also be of economic interest. Understanding of the diverse processes and their controlling factors is therefore not only of scientific interest but also of high economic importance to cover the demand for rare metals. The redistribution of major and trace elements during partial melting represents a central step for the understanding how granite-bound mineralization develops (Hedenquist and Lowenstern, 1994). The partial melt generation and mobilization of ore elements (e.g. Sn, W, Nb, Ta) into the melt depends on the composition of the sedimentary source and melting conditions. Distinct source rocks have different compositions reflecting their deposition and alteration histories. This specific chemical “memory” results in different mineral assemblages and melting reactions for different protolith compositions during prograde metamorphism (Brown and Fyfe, 1970; Thompson, 1982; Vielzeuf and Holloway, 1988). These factors do not only exert an important influence on the distribution of chemical elements during melt generation, they also influence the volume of melt that is produced, extraction of the melt from its source, and its ascent through the crust (Le Breton and Thompson, 1988). On a larger scale, protolith distribution and chemical alteration (weathering), prograde metamorphism with partial melting, melt extraction, and granite emplacement are ultimately depending on a (plate-)tectonic control (Romer and Kroner, 2016). Comprehension of the individual stages and their interaction is crucial in understanding how granite-related mineralization forms, thereby allowing estimation of the mineralization potential of certain areas. Partial melting also influences the isotope systematics of melt and restite. Radiogenic and stable isotopes of magmatic rocks are commonly used to trace back the source of intrusions or to quantify mixing of magmas from different sources with distinct isotopic signatures (DePaolo and Wasserburg, 1979; Lesher, 1990; Chappell, 1996). These applications are based on the fundamental requirement that the isotopic signature in the melt reflects that of the bulk source from which it is derived. Different minerals in a protolith may have isotopic compositions of radiogenic isotopes that deviate from their whole rock signature (Ayres and Harris, 1997; Knesel and Davidson, 2002). In particular, old minerals with a distinct parent-to-daughter (P/D) ratio are expected to have a specific radiogenic isotope signature. As the partial melting reaction only involves selective phases in a protolith, the isotopic signature of the melt reflects that of the minerals involved in the melting reaction and, therefore, should be different from the bulk source signature. Similar considerations hold true for stable isotopes. N2 - Partielle Schmelzbildung ist ein zentraler Prozess für die geochemische Differentiation der Erdkruste (Vielzeuf et al., 1990). Die Umverteilung chemischer Elemente während der Schmelzbildung beeinflusst die Zusammensetzung der oberen und unteren Erdkruste entscheidend und stellt einen Mechanismus zur Konzentration und zum Transport chemischer Elemente dar. Das Verständnis der diversen Prozesse und der kontrollierenden Faktoren ist deshalb nicht nur von wissenschaftlichem Interesse sondern auch von ökonomischer Bedeutung um die Nachfrage für seltene Metalle zu decken. Die Umverteilung von Haupt- und Spurenelementen während des partiellen Aufschmelzens ist ein entscheidender Schritt für das Verständnis wie sich granitgebundene Lagerstätten bilden (Hedenquist and Lowenstern, 1994). Die Schmelzbildung und die Mobilisierung von Erz-Elementen (z. B. Sn, W, Nb, Ta) in die Schmelze hängt von der Zusammensetzung der sedimentären Ausgangsgesteine und den Schmelzbedingungen ab. Verschiedene Ausgangsgesteine haben aufgrund ihrer Ablagerungs- und Verwitterungsgeschichte unterschiedliche Zusammensetzungen. Dieses spezifische geochemische „Gedächtnis“ resultiert in unterschiedlichen Mineralparagenesen und Schmelzreaktionen in verschiedenen Ausgangsgesteinen während der prograden Metamorphose. (Brown and Fyfe, 1970; Thompson, 1982; Vielzeuf and Holloway, 1988). Diese Faktoren haben nicht nur einen wichtigen Einfluss auf die Verteilung chemischer Elemente während der Schmelzbildung, sie beeinflussen auch das Volumen an Schmelze, die Extraktion der Schmelze aus dem Ausgangsgestein und deren Aufstieg durch die Erdkruste (Le Breton and Thompson, 1988). Auf einer grösseren Skala unterliegen die Verteilung der Ausgangsgesteine und deren chemische Alteration (Verwitterung), die prograde Metamorphose mit partieller Schmelzbildung, Schmelzextraktion und die Platznahme granitischer Intrusionen einer plattentektonischen Kontrolle. Das Verständnis der einzelnen Schritte und deren Wechselwirkungen ist entscheidend um zu verstehen wie granitgebunden Lagerstätten entstehen und erlaubt es, das Mineralisierungspotential bestimmter Gebiete abzuschätzen. Partielles Aufschmelzen beeinflusst auch die Isotopensystematik der Schmelze und des Restites. Die Zusammensetzungen radiogener und stabiler Isotopen von magmatischen Gesteinen werden im Allgemeinen dazu verwendet um deren Ursprungsgesteine zu identifizieren oder um Mischungsprozesses von Magmen unterschiedlichen Ursprunges zu quantifizieren (DePaolo and Wasserburg, 1979; Lesher, 1990; Chappell, 1996). Diese Anwendungen basieren auf der fundamentalen Annahme, dass die Isotopenzusammensetzung der Schmelze derjenigen des Ausgangsgesteines entspricht. Unterschiedliche Minerale in einem Gestein können unterschiedliche, vom Gesamtgestein abweichende, Isotopenzusammensetzungen haben (Ayres and Harris, 1997; Knesel and Davidson, 2002). Insbesondere für alte Minerale, mit einem unterschiedlichen Mutter-Tochter Nuklidverhältnis, ist eine spezifische Isotopenzusammensetzung zu erwarten. Da im partiellen Schmelzprozess nur bestimmte Minerale eines Gesteines involviert sind, entspricht die Isotopenzusammensetzung der Schmelze derjenigen der Minerale welche an der Schmelzreaktion teilnehmen. Daher sollte die Isotopenzusammensetzung der Schmelze von derjenigen des Ursprungsgesteines abweichen. Ähnliche Überlegungen treffen auch für stabile Isotopen zu. KW - geochemistry KW - trace elements KW - radiogenic isotopes KW - stable isotopes KW - resources KW - Sn Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-423702 ER -