Download or read book Mineralization and Shear Zones written by and published by . This book was released on 1989 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gold Mineralization in Shear Zones written by Stan White and published by . This book was released on 1987 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural Geology Workshops written by Stan H. White and published by . This book was released on 1987 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proterozoic Orogens of India written by T.R.K. Chetty and published by Elsevier. This book was released on 2017-07-12 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proterozoic Orogens of India: A Critical Window to Gondwana provides a unique opportunity to understand a cross-section of the well-exposed and best-studied part of Earth’s crust and the processes of continental collision. It covers pulses of reworking processes and their impact on magmatism, metamorphism and deformational history of Proterozoic orogens vis-à-vis the supercontinental formation. The details of structural architecture, crustal blocks, shear zone systems, magmatism, metamorphism, geochemical and isotopic signatures, mineralization and tectonic models of all the Proterozoic orogens of India are discussed along with excellent illustrations reflecting the field-based, multi-scale structural and geological data sets.The spatial distribution, geometry, kinematics and transpressional strain of the shear zone systems (mostly suture zones), which are critical to all conceptual models dealing with tectono-metamorphic history of Proterozoic orogens of India, are also covered. The book summarizes and integrates the state-of -the art understanding of the structural architecture, lithological assemblages, petrological, geochemical, geochronological and geophysical aspects of the Proterozoic orogens of India. Includes a much needed state-of-the-art tectonic summary of the voluminous data that has emerged from the Protrozoic orogens of India in the last 2-3 decades Authored by a well-established expert with more than 30 years of experience in the field based, multi-scale structural geological studies of the ancient orogens of India Covers up-to-date reviews and models of Proterozoic orogens developed in the Indian shield over the past 2.5 billion years of Earth history

Download or read book Gold Mineralization Associated with Shear Zones in Mafic Volcanic Rocks North of Snow Lake Manitoba written by Mark G. Steacy and published by . This book was released on 1982 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shear Zones and Mineralization a Joint Meeting of Mineral Deposits Studies Group and Tectonic Studies Group University of Southampton Saturday 31 October 1987 written by and published by . This book was released on 1987* with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relationships Between Shear Zones and Mineralization in the Nubian Shield of Northeast Sudan written by D. C. Almond and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mineralization and Shear Zones Montreal Quebec May 12 14 1989 written by C.Jay Hodgson and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atlas of Deformed and Metamorphosed Rocks from Proterozoic Orogens written by T.R.K. Chetty and published by Elsevier. This book was released on 2021-08-20 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlas of Deformed and Metamorphosed Rocks from Proterozoic Orogens is a richly illustrated reference book featuring over 660 full-color field images of a range of lithologies from some Proterozoic terrains that were subjected to multiple events of magmatism, deformation, metamorphism, and metasomatism. The Atlas focuses on amphibolite to granulite facies lithologies and associated ma?c-ultrama?c rocks from Proterozoic orogens of India, Sri Lanka, Botswana, South Africa, East Antarctica, and Western Australia. Each chapter in the book begins with a brief review of geology, including deformation and metamorphic history, along with a regional geological map to help readers to visualize the ?eld observations in the relevant geological context. Each image is accompanied by a concise description providing location, lithology, structural fabric, possible deformational history, metamorphic features, partial melting, metasomatism, and other important crustal processes. This Atlas is an important source of information for a broad range of earth scientists, graduate and undergraduate students, researchers, academicians, and other professionals. This book will form a great treasure to those geoscientists who never had an opportunity to visit any of the Proterozoic orogenic belts. Features over 660 full-color photographs representing typical lithologies and associated structural, metamorphic features, and other crustal processes from different Proterozoic orogens Highlights the significance of field photographs in advancing new knowledge which may provide pathways for new research Covers many important Proterozoic terranes of East Gondwana Presents regional geologic maps from each Proterozoic orogen

Download or read book The Geology Gold Mineralization and Greenstones of the Whisky Knob Area of Eastern Central Victoria written by Jonathan Christian Kelly and published by . This book was released on 1991 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are two macroscopic shear zones in the Whisky Knob area. One trends northwest-southeast, parallel to the pronounced structural grain of the area, whilst the second trends approximately east-west and truncates the northwest orientated shear zone. The shear zones display brittle-ductile deformation. Disseminated gold mineralization occurs in rhyolitic bodies hosted by the two shear zones and displays characteristics which are consistent with epithermal mineralization at shallow depth in a high sulphidation system. The mineralization is associated with much pyrite and massive silica. At least three generations of quartz veins, minor breccia pipes and vuggy dissolution cavities can be recognised. The genesis of the mineralization is probably related to the operation of a meteoric water convection cell set in motion by a magmatic heat engine. The greenstones of the Whisky Knob region have affinities with high-magnesium, calc-alkaline orogenic andesites. The greenstones are thought to represent an island arc constructed through the subduction of young hot lithosphere.

Download or read book The Study of Um Addabah Area written by Farouk Yahia Bokhari and published by . This book was released on 1979 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mineralization and Sustainable Development in the West African Craton written by T. Aïfa and published by Geological Society of London. This book was released on 2021-07-22 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Publication combines results obtained by interdisciplinary groups from numerous academic institutions working on Paleoproterozoic formations to decipher the origins of the main mineralization resources in the West African Craton (WAC) and their impacts on African economic development. Structural, geophysical, sedimentological, stratigraphical, geochemical, petrophysical and mineralogical analyses have been used to highlight the complexities involved in mineralization emplacement and its origin and evolution within the WAC. Fourteen articles contribute to new knowledge in mineral research. They show that the geodynamic evolution of the WAC is complex from one area to another: it involves subduction, collision and obduction during several deformation phases ranging from Birimian (2.3–2.0 Ga) to Pan-African (650–450 Ma) events. Various modelling techniques, when integrated, help in understanding the mechanisms of mineralization emplacement, some of which are still a matter of debate. The challenge for further studies is mitigation for sustainable development that can be appropriately used to minimize such damage.

Download or read book Hydrothermal Alteration Mass Transfer and Magnetite Mineralization in Dextral Shear Zones Western Hudson Highlands NY written by Michael J. Kalczynski and published by . This book was released on 2012 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Massive magnetite 'veins' formed during hydrothermal mineralization within northeast trending dextral shear zones in the crystalline bedrock of the western Hudson Highlands, New York. The veins formed in right step-over dilational jogs during the late stages of movement, in an open fracture system. Acidic metamorphic fluids derived from metavolcanic country rock and saturated with iron, flushed through fractures, reacted with wall rock, and exchanged chemical species. Buffered by the composition of the local country rock, fluids migrated and mixed along the fault during seismically induced 'pumping' events. The fluids migrated and deposited varying gangue mineral assemblages in favorable conditions in the dilated fractures. These assemblages reflect the changing flux, fluid buffering source, and/or physical conditions. Three distinct zones formed through this process. The wall rock adjacent to the vein was altered to form a 'bleached' zone. The vein contains an outer 'layered' zone of ferromagnesian-rich bands, and a core of 'massive' magnetite ore and gangue minerals. Bleached zones are dominated by amphibole and/or pyroxene, including scapolite, biotite, and apatite, within metavolcanic and quartzofeldspathic gneiss, or phlogopite and calcite within calc-silicate country rock. Calc-silicate layered and massive assemblages contain clinopyroxene, calcite, amphibole, and/or biotite or phlogopite. Quartzofeldspathic and metavolcanic layered and massive assemblages are dominated by amphibole and/or orthopyroxene, with quartz and/or sulfides and calcite locally. Both assemblages contain magnetite, including the massive ore, central to the deposits. Geochemical modeling of the bleached zone shows overall gains in volume (2.5-20.3%) and mass (3.1-18.1g relative to 100g of wall rock). In all instances, iron (2.4-5.3g), magnesium (1.0-2.8g), and calcium (0.6-6.5g), were gained, more so in calc-silicate adjacent deposits. Deposits adjacent to quartzofeldspathic country rock had large gains in silica (4.4-7.4g), whereas deposits in/near mafic metavolcanic rock lost silica (1.4-3.8g). Based on the mobility of silica, fluid fluxes were calculated between 5.3 x 105 to 6.6 x 106 cm3/cm2 for bleached zone alteration, large enough for significant element transport. Elements in abundance in the country rock contributed to the composition of the deposits, dominantly silica, calcium and sulfides.

Download or read book Structural Control of Mineral Deposits written by Alain Chauvet and published by MDPI. This book was released on 2019-04-16 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Structural Control” remains a crucial point that frequently lacks in any scientific and/or economic analysis of ore deposits, whatever their type and class. The case of lode deposits is exemplary, although also other deposits, like breccia pipe, stockwerk, massive sulphides, skarn, etc., can, surprisingly, be concerned. Several concepts like the gold-bearing shear zone have not proven valid during the last few decades in terms of our understanding of gold deposit and have been totally abandoned. Additionally, the relationships between magmatism, regional tectonic context, and mineralization remain uncertain and have been debated in several recent publications. This demonstrates that this issue is still relevant, and its solution may help in the distinction between intrusion-related and orogenic deposits. In this Special Issue, we particularly invite any case study of mineral deposits, in which it has been demonstrated that structural geology may have a significant role in the establishment of the deposit model of formation and/or on exploration and exploitation programs. Examples in which the structural model diverges from those described in the classical literature are particularly welcomed, including studies in which relationships with magmatism can be suspected and/or demonstrated. Indeed, all cases that illustrate concepts that differ from the classic ones and from theoretical models may represent significant contributions to this volume.

Download or read book A Regional Structural Model for Gold Mineralization in the Southern Part of the Archean Superior Province United States written by Paul Kibler Sims and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Canadian segment of the Archean Superior province is a major world source of lode gold. The gold deposits occur in or near regional transcurrent and oblique slip-shear deformation zones that comprise a conjugate set to a northwest- directed compression of the Superior province. These structures provided permeable pathways for the flow of large volumes of auriferous fluid derived from an external source. Historic gold production from the United States segment of the Superior province is modest, but the close similarity in the geologic environment of the United States and Canadian segments suggests that large gold deposits should be present in the U.S.A. An occurrence model largely based on known parameters of gold mineralization in Canada suggests that the greenstone-granite terranes of the Wawa and Wabigoon sub-provinces in the United States are favorable for important gold deposits. The model suggests that gold mineralization took place during or later than the transcurrent faulting and that it took place contemporaneously with emplacement of silica-undersaturated intrusions. The faulting occurred late in the igneous-tectonic history of the Superior province, about 2,690 Ma. Extensive, intense alteration comprising carbonitization, silicification, and sulfidization accompanied the gold mineralization. The relationships between alteration minerals and mineralized veins suggest a close temporal relationship between the alteration and gold mineralization processes. The proposed occurrence model for gold mineralization and the available data suggest that two broad regions of greenstone in the Archean Superior province in north-central United States are particularly favorable for gold deposits: (1) the Upper Peninsula of Michigan, and (2) northeastern Minnesota. The Ishpeming greenstone belt of the Wawa subprovince in Michigan contains the important Ropes deposit and several other known gold occurrences, and the Vermilion district (Wawa subprovince) in northeastern Minnesota contains highly anomalous gold in soils and minor known bedrock occurrences. Transcurrent faults in both areas should be favorable sites for gold mineralization

Download or read book The Geology and Mineralization of the Renco Gold Mine Northern Marginal Zone Southern Zimbabwe written by A. F. M. Kisters and published by . This book was released on 1997 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanochemistry of Materials written by E. M. Gutman and published by Cambridge Int Science Publishing. This book was released on 1998 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerable advances have been made in mechanochemistry in the last couple of decades. Training of experts in this field with a background in materials science, chemical and mechanical engineering, etc. requires study of the fundamentals of mechanochemistry. There is a need for a textbook in the general and compressed form which would cover many aspects and would be used as a basis for understanding the fundamental principles to control mechanochemical phenomena. This textbook is based on lectures given by Prof Gutman in a graduate course in the mechanochemistry of materials at the Ben-Gurion University of the Negev. The book contains examples of experimental results to illustrate the mechanochemical phenomena and technologies Contents What is mechanochemistry of materials? Basic features of the behaviour of solids relevant to mechanochemical processes Irreversible thermodynamics of mechano-chemical reactions Kinetics of mechanochemical reactions under different stress state Main types of heterogeneous mechano-chemical reactions Mechanoelectrical phenomena and mechano-emission Application of mechanochemistry in materials engineering