Metallogeny and petrogenesis of lamprophyres in the mid-European Variscides : post-collisional magmatism and its relationship to late-Variscan ore forming processes in the Erzgebirge (Bohemian Massif)

Based on a worldwide database of lamprophyres, N.M.S. Rock (1991) noted that ... Lamprophyres are a missing element in the traditional granites + mineralization maxim which should no longer be ignored ... The Erzgebirge or Ore Mountains province is a key locality in the European Variscides to observe the important relationships between granites, lamprophyres, and a spectacular array of spatially overlapping mineralization types. Lamprophyre dikes and associated magmatic rocks were systematically mapped in the mining fields of the Erzgebirge and surrounding areas. Data are presented that unarguably demonstrate the important role played by lamprophyric rocks in the Erzgebirge ore province. Three intrusive stages of lamprophyres indicate significant mantle-associated magmatic pulses during the Permo-Carboniferous. Sn-W-Mo, Ag-base metal, and U mineralization events show a close spatial association to post-collisional lamprophyric and small granitic-rhyolitic intrusions which post-date widespread late-collisional granites. The metallogenetic importance of volatile-rich lamprophyres in the Erzgebirge is further affirmed by the overlapping temporal relationship between lamprophyres and post-collisional granitic-rhyolitic intrusions, as determined by modern radiometric dating and age data of lithostratigraphic unites of the Sub-Erzgebirge basin. The model presented in this book is important for exploration for Sn, W, Mo, Ag, Cu, Zn, Pb, In, and U mineralization in the Bohemian Massif and comparable ore deposit provinces worldwide.IOS Press is an international science, technical and medical publisher of high-quality books for academics, scientists, and professionals in all fields. Some of the areas we publish in: -Biomedicine -Oncology -Artificial intelligence -Databases and information systems -Maritime engineering -Nanotechnology -Geoengineering -All aspects of physics -E-governance -E-commerce -The knowledge economy -Urban studies -Arms control -Understanding and responding to terrorism -Medical informatics -Computer Sciences Title page......Page 2 Contents......Page 6 Abstract......Page 12 Introduction......Page 14 Geological Setting and Magmatic Events......Page 18 Study Areas and Selection Criteria......Page 20 W-Mo Mineralization......Page 22 Age of mineralization......Page 23 Uranium Vein-Type Mineralization......Page 24 Radiogenic Isotopes......Page 30 K-Ar and 40Ar-39Ar geochronology......Page 31 Zircon dating......Page 32 Petrographic Types and Relatively Ages......Page 36 LD2c-type lamprophyres......Page 37 Early magmatic trioctahedral micas......Page 38 Early magmatic fluor-apatite......Page 39 Whole Rock and Trace Element Characteristics......Page 60 Sr and Nd isotopes......Page 87 Pb isotopes......Page 90 40Ar-39Ar and K-Ar Analyses......Page 100 U-Pb Single Zircon Shrimp, Vapor-Transfer (VTM) and Pb-Pb Single Zircon Evaporation Analyses......Page 101 Indications for the Magmatic-(Mantle-)Related Sources of Late-Variscan Mineralization in the Erzgebirge......Page 106 Sn-W-Mo-Bi-Cu-Li-F Mineralization......Page 107 Pb Isotopes......Page 108 Oxygen and carbon isotopes, and fluid inclusions......Page 109 Structural Relationships to Magmatic Rocks......Page 112 Ag-base metal and U mineralization......Page 113 Discussion......Page 116 Conclusions......Page 128 References......Page 130 Plates I -- VI......Page 156 Tables A1 -- A27......Page 176