Evidence of the latest Paleoproterozoic (~1615 Ma) mafic magmatism the southern Siberia: Extensional environments in Nuna supercontinent
Д. П. ГладкочубТ. V. DonskayaSergei PisarevskyЕ. Б. СальниковаА. М. МазукабзовA. B. KotovZ. L. MotovaA. V. StepanovaВ. П. Ковач
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The physics that controls magmatic ascent and near‐surface lateral intrusion is briefly discussed. It is argued that silicic magmas can intrude subhorizontal horizons within unconsolidated sediments to form sills that are tens of kilometres in length but only tens of metres in thickness.
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fluids result in a wide spectrum of features, including the The International Association of Volcanology and Chemfollowing: istry of the Earth’s Interior (IAVCEI) held its General Assembly at Puerto Vallarta, Mexico, on 19–24 January • textural: rhythmic mineral zonation, magmatic 1997. The IAVCEI Commission on Granites (leaders B. foliation, quenching fabrics, subsolidus reBonin, Orsay, and P. A. Candela, College Park) held on crystallization, brecciation, etc.; this occasion, within the framework of IAVCEI Sym• physical: phase separation, hydraulic fracturing, posium 9 (Granites), a special session dedicated to ‘Highexplosive degassing, etc.; level silicic magmatism and related hydrothermal sys• chemical: unusually trace-element-enriched melt tems’, convened by Reimar Seltmann, Bernd Lehmann, compositions, formation of brines, rare-element Jacob B. Lowenstern and Phil A. Candela. This session mineralization, etc. was jointly organized with the newly approved International Geological Correlation Programme (IGCP) Furthermore, volcano-plutonic systems strongly affect Project 373 on ‘Correlation, anatomy and magmatic– the atmosphere and hydrosphere through their release hydrothermal evolution of ore-bearing felsic igneous sysof a variety of gases. Studies of the mechanics of degassing tems’ (leader R. Seltmann, Potsdam). This publication and magma dynamics provide the means to interpret gas of selected papers from the symposium takes place under compositions and the periodicity of gas release from the auspices of IGCP-373, reflecting the major goals of volcanoes and high-level intrusions. this international collaboration project and presenting its Papers were invited to address the above issues in the first research results. context of field, experimental or theoretical approaches. The papers selected for publication in this special issue Emphasis is on new findings from textural, physical reflect a wide range of current research in the above and chemical studies of high-level silicic magmatism, field. High-level granitic systems and their volcanic associated hydrothermal systems, and their encounterparts are characterized by extreme fractionation vironmental impact. In addition, a few papers of a processes and intensive fluid–rock reactions. Volatile review nature have also been included (Candela, London, components such as H2O, CO2, F, Cl, B, P and Li have Webster). a fundamental influence on melt structure and viscosity, Areas of current research reflected in the 13 papers with implications for magma ascent and intrusion. Their effects on the melt phase and their presence in exsolved selected for publication in this issue include:
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Commingling between contemporaneous mafic and felsic magmas is now widely recognized in a broad range of intrusions and intrusive complexes. These interactions are important features for two main of reasons: (1) the rapidly chilled margins of mafic magma against silicic magma commonly preserve the compositions of mafic liquids, and (2) because the mafic magma solidifies rapidly, the resulting (final) configurations of mafic and felsic magmas can provide insights into physical processes and changing viscosity contrasts and rheologies of magmas and felsic crystal mush during crystallization of the mafic magma.
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