Regional Studies

1st Edition, Volume 5 - January 1, 1976
Author: Bozzano G Luisa
Language: English
eBook ISBN:
9 7 8 - 0 - 4 4 4 - 5 9 8 9 5 - 0

Regional Studies is a collection of papers that deals with strata-bound mineral deposits in the Eastern Alps, in the Canadian Cordillera, in north-central, and southwest England.… Read more

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Regional Studies is a collection of papers that deals with strata-bound mineral deposits in the Eastern Alps, in the Canadian Cordillera, in north-central, and southwest England. Other papers describe southern African stratiform ore deposits and the genesis of Irish base-metal deposits. One paper compares the various types of volcanogenic mineral deposits and their depositional environments characterized by distinct assemblages of volcanic rocks, which formed in the Northern Appalachians during certain episodes of the tectonic evolution. The paper notes that the youngest volcanogenic deposits of economic interest are tungsten—molybdenum—tin—bismuth base metal deposits in highly altered rhyolitic sub-volcanic complexes at Mount Pleasant, New Brunswick. Another paper reviews the mineral occurrences in southern Africa that include stratiform, non-magmatic, ore deposits, The paper considers a subdivision of deposits formed from surficial chemical processes during previous (or current) cycles of weathering and erosion. Many ore bodies have a dual origin: for example, the iron in the high-grade hematite deposits is partly syngenetic and partly epigenetic. The paper also illustrates the time-dependence of some stratiform ore deposits in southern Africa in a schematic diagram. Geologists, researchers, or engineers whose works are related with ore deposits and mining will benefit tremendously from the collection.

Chapter I. The Strata-Bound Ore Deposits in the Eastern Alps Introduction Lead-Zinc (Barite-Fluorite) Deposits Sulfide ("Kies") Deposits with Copper Contents Uranium Deposits and Copper Mineralisations in Sandstones Scheelite Deposits Stibnite Deposits Cinnabar Deposits Magnesite Deposits Siderite Deposits Manganese Deposits Summary and Conclusions ReferencesChapter 2. Stratabound Mineral Deposits of the Canadian Cordillera Introduction Tectonic Framework Stratigraphic Framework of the Columbian Orogen Proterozoic Paleozoic and Early Mesozoic Late Mesozoic and Tertiary Stratigraphic Framework of the Pacific Orogen Crystalline Basement Paleozoic Rocks Mesozoic Rocks Cenozoic Rocks Definitions Stratabound Deposits in the Columbian Orogen: Deposits in Rocks of Proterozoic Age General Geology of the Belt-Purcell Supergroups Copper in the Belt and Purcell Supergroups Copper Mineralization in Other Purcell Rocks Summary Lead and Zinc in the Purcell Supergroup Summary Iron Formation in the Windermere (Hadrynian) System Stratabound Deposits in the Columbian Orogen: Deposits of Early and Middle Paleozoic (and Latest Proterozoic) Age Lead and Zinc Mineralization in Southern Cordillera Lead-Zinc Mineralization in Northern Cordillera General Distribution and Geology of Deposits of Middle Devonian Age Summary Stratabound Deposits in the Pacific Orogen Massive Sulphide Deposits Stratabound and Stratiform Deposits Stratabound Deposits with Dispersed Mineralization Deposits with Copper Sulphide - Native Copper Mineralizations Summary Acknowledgements ReferencesChapter 3. Comparison of Volcanogenic Mineral Deposits in the Northern Appalachians and their Relationship to Tectonic Evolution Introduction General Geology Precambrian Cambrian-Ordovician Silurian-Devonian Carboniferous and Later Volcanogenic Mineral Deposits Deposits in Volcanic Rocks Along Disrupted Continental Margin (or Intracratonic Basin) Deposits in Submarine Mafic ("Oceanic Ridge") Volcanic Rocks Deposits in Submarine Mafic to Felsic ("Island Arc") Volcanic Rocks Terrestrial Sub-Volcanic Deposits Discussion Acknowledgements Postscript ReferencesChapter 4. The Ores of the South Pennines and Mendip Hills, England — A Comparative Study Introduction South Pennines Introduction Stratigraphy Structure Later Geological History Permo-Triassic Mineralization Minerals Present The Ore Bodies Thermal Zoning Fluid Inclusions Isotope Dating Wall-Rock Alteration Genesis of the Ore Deposits The Mendip Hills Introduction Stratigraphy Structure The Mineral Field Mineralogy Thermal, Isotope and Other Studies Ore Genesis Comparisons of South Pennine and Mendip Orefields Conclusions Acknowledgements ReferencesChapter 5. Ores of the Northern Pennines, The Lake District and North Wales Introduction Northern Pennine Orefield - Alston Block The Mineral Deposits The Minerals Zonation of the Orefield Fluid-Inclusion Studies Wall-Rock Alteration Age of Mineralisation Genesis of the Ores Northern Pennine Orefield - Askrigg Block The Mineral Deposits Zonation of the Orefield Lake District Orefield The Mineral Deposits Zonation of the Orefield Fluid-Inclusion Studies Wall-Rock Alteration Age of the Mineralisation Genesis of the Ores Northeast Wales Orefield Stratigraphy Structure Minerals The Ore Bodies Zonation of the Orefield Fluid-Inclusion Studies Wall-Rock Alteration Age of Mineralisation Genesis of the Ore Deposits Conclusions References Northern Pennine Orefield - Alston Block Northern Pennine Orefield - Askrigg Block Lake District Orefield Northeast Wales OrefieldChapter 6. Genesis of Irish Base-Metal Deposits Introduction: The Geological Framework Occurrence, Nature and Genesis of the Mineral Deposits The Caledonian Metamorphic Belt The Variscan Fold Belt Red-Bed Copper Deposits Vein Deposits The Variscan Foreland - The Central Plain of Ireland The Deposits in the Lower Palaeozoic Inliers The Deposits in the Lower Carboniferous ReferencesChapter 7. A Review of Southern African Stratiform Ore Deposits - their Position in Time and Space Introduction The Stratigraphic History of Southern Africa Classification of Stratiform Ore Deposits Mechanical Concentrations Ancient Placer Deposits Recent Submarine, Coastal and Alluvial Placer Deposits Organic Accumulations Coal and Oil Shale in the Karroo Supergroup Petroleum Chemical Precipitates Limestone, Dolomite and Marble Ironstone Iron Formation Manganese The Asbestiform Amphiboles Volcanogenic Ore Deposits Volcanogenic Deposits in Greenstone Belts Volcanogenic Deposits in the Northwest Cape Province Volcanogenic Deposits in the Damara Supergroup, South West Africa Stratiform Epigenetic Deposits Hypo-, meso- and epi-Thermal Ore Deposits Pyrometasomatic Deposits Telethermal Deposits Deposits Related to Surficial Processes High-Grade Iron Deposits Manganese Phosphates Gypsum Calcrete Salt Bauxite Deposits Related to Metamorphism Metamorphic Minerals in Carbonate Rocks Silicates and Oxides of Alumina Southern African Metallogenic Epochs Acknowledgements References