Download or read book Volcanogenic Massive Sulphide related Hydrothermal Events Within the Paleoproterozoic Snow Lake Arc Assemblage written by A. G. Galley and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Volcanogenic Massive Sulphide related Hydrothermal Alteration Events Within the Paleoproterozoic Snow Lake Arc Assemblage written by A. G. (Alan George) Galley and published by [Saskatoon] : GAC-MAC Saskatoon 2002 Local Organizing Committee. This book was released on 2002 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ore Types of the Auriferous Lalor VMS Deposit Snow Lake Manitoba written by Shamus Duff and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lalor deposit is a newly discovered Paleoproterozoic volcanogenic massive sulphide (VMS) deposit located at the east end of the Flin Flon-Snow Lake belt within the Snow Lake arc assemblage. Lalor is the largest of 11 VMS deposits in the Snow Lake arc assemblage, with combined resources and reserves of 25.3 Mt and average grades of 2.9 g/t Au, 25 g/t Ag, 5 wt% Zn and 0.79 wt% Cu, including 8.8 Mt at 4.6 g/t Au. Lalor and all other deposits in the Snow Lake arc assemblage have been affected by intense polyphase deformation and amphibolite facies metamorphism. As a result, both the original hydrothermal alteration assemblages and the ore mineral assemblages have been completely recrystallized. However, a variety of different ore types have been preserved, allowing the partial reconstruction of the hydrothermal system, including massive Fe-Zn sulphide lenses, discordant Cu-Au stringer zones, and distinctive precious metal-rich Au-Ag-Pb-Cu zones. The different ore types occur in a series of stratigraphically and structurally "stacked" ore lenses that partly overlap but still largely preserve the original architecture of the deposit. The ore is distributed in 12 discrete lenses or zones of mineralization that are interpreted to be the result of several distinct and overlapping hydrothermal events. Type 1 Fe-Zn massive sulphide ore is the most common ore type in six ore lenses and consists of massive coarse-grained pyrite and sphalerite with trace galena in dominantly quartz-muscovite±kyanite-biotite schist (K alteration association). Type 2 Cu-Au mineralization consists of semi-massive and stockwork chalcopyrite and pyrrhotite in garnetiferous quartz-biotite±staurolite-amphibole-cordierite gneisses (footwall Mg-Fe alteration association). Despite extensive recrystallization and local remobilization, these two ore types are interpreted to represent the (metamorphosed) low- and high-temperature ore assemblages, respectively, of a typical volcanogenic massive sulphide deposit. Type 3 Au-Ag-Pb-Cu-rich ore consists of stringer and disseminated sulphides and sulphosalts mainly hosted in chlorite-carbonate-actinolite schist (Mg-Ca and Ca alteration associations). Galena is an important indicator of Au mineralization and occurs in this ore type as fine-grained blebs in a matrix of chlorite, dolomite, calcite, anthophyllite, Ca-plagioclase, and calc-silicates (epidote, grossular, diopside, Ca-amphibole ± scapolite). Where abundant, the galena is associated with chalcopyrite, pyrite, pyrrhotite and minor to trace sphalerite, Ag-Sb-Pb sulphosalts, electrum and native gold. Type 4 low-sulphide ore contains ≤10 vol% disseminated pyrite in quartz-biotite-anthophyllite gneiss, with minor chlorite, staurolite, and coarse almandine garnet, and has variable Au grades. The sulphides and sulphosalts in ore types 3 and 4 are interpreted to be metamorphically remobilized from pre-existing disseminated mineralization. The hydrothermal system developed during two main episodes of seafloor volcanism. Type 1 massive sulphides in the 10 and 11 lenses and in the 20, 30, 31, and 40 lenses were formed at the paleoseafloor. These lenses are underlain by Type 2 Cu-Au stockwork mineralization (27 Lens) and originally conformable zones of Type 3 Au-Ag-Pb mineralization (21, 24, 25, 26, and 28 lenses). The large Cu-Au stockwork zone (27 Lens) may have been the main feeder of the deposit and is partly continuous with disseminated Au-Ag-Pb-Cu galena-sulphosalts mineralization below the 20 base metal Lens. The Au-Ag-Pb-Cu mineralization is thought to have formed in the subseafloor from late-stage, lower-temperature hydrothermal fluids (ca. 300°C). In this model, significant Au was introduced first by high-temperature (300°C) fluids responsible for the Type 2 Cu-Au mineralization and then by lower-temperature (possibly boiling) hydrothermal fluids responsible for Type 3 Ag-Au-Pb-Cu mineralization. Although all the ore types are extensively recrystallized and partly remobilized, their distribution strongly supports primary hydrothermal Au enrichment at Lalor. The lead isotopic compositions of the ore galena show no evidence of post-magmatic disturbance that would be expected if Au had been introduced during deformation and metamorphism (e.g., as in the nearby New Britannia orogenic Au deposit), and the Au-rich assemblages are very similar to those that commonly occur in unmetamorphosed Au-rich volcanogenic massive sulphide deposits.
Download or read book Mineral Deposits of Canada written by Wayne David Goodfellow and published by . This book was released on 2007 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Volcanic associated Massive Sulfide Deposits written by and published by . This book was released on 2010 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin Geological Survey of Canada written by Geological Survey of Canada and published by . This book was released on 1950 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific Investigations Report written by Sharon E. Kroening and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of Activities written by Manitoba. Geological Survey and published by . This book was released on 2014 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physical Volcanology and Hydrothermal Alteration Associated with Late Caldera Volcanic and Volcaniclastic Rocks and Volcanogenic Massive Sulfide Deposits in the Sturgeon Lake Region of Northwestern Ontario Canada written by George J. Hudak and published by . This book was released on 1996 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2009 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EXTECH I written by Graeme Bonham-Carter and published by . This book was released on 1996 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Geology and Metallogeny of the Stewart Mining Camp Northwestern British Columbia written by Dani J. Alldrick and published by Province of British Columbia, Ministry of Energy, Mines and Petroleum Resources. This book was released on 1993 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the geological setting of the mining camp and geologic features of the major mineral deposit types. New ideas about the tectonic setting and metallogenic history of the district are also presented. The area lies near the eastern margin of the Coast Mountains at the head of the Portland Canal, a fiord 115 kilometres long, which marks the southeastern boundary between the Alaska Panhandle and northwestern British Columbia.
Download or read book Plutonism in the Central Part of the Sierra Nevada Batholith California written by Paul C. Bateman and published by . This book was released on 1992 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the structure, composition, and pre-Tertiary history of the Sierra Nevada batholith in the Mariposa 1 by 2 quadrangle.
Download or read book Understanding Mineral Deposits written by Kula Misra and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 857 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mineral deposits have supplied useful or valuable material for human consumption long before they became objects of scientific curiosity or commercial exploitation. In fact, the earliest human interest in rocks was probably because of the easily accessible, useful (e. g. , red pigment in the form of earthy hematite) or valuable (e. g. , native gold and gemstones) materials they contained at places. In modem times, the study of mineral deposits has evolved into an applied science employing detailed field observations, sophisticated laboratory techniques for additional information, and computer modeling to build complex hypotheses. Understanding concepts that would someday help geologists to find new mineral deposits or exploit the known ones more efficiently have always been, and will continue to be, at the core of any course on mineral deposits, but it is a fascinating subject in its own right, even for students who do not intend to be professional economic geologists. I believe that a course on mineral deposits should be designed as a "capstone course" that illustrates a comprehensive application of concepts from many other disciplines in geology (mineralogy, stratigraphy and sedimentation, structure and tectonics, petrology, geochemistry, paleontology, geomorphology, etc. ). This book is intended as a text for such an introductory course in economic geology, primarily for senior undergraduate and graduate students in colleges and universities. It should also serve as a useful information resource for professional economic geologists.
Download or read book Geoscientific Report written by and published by . This book was released on 2004 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Altered Volcanic Rocks written by Cathryn Gifkins and published by CODES-University of Tasmania. This book was released on 2005-01-01 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is about the processes and products of alteration in submarine volcanic successions. Its emphasis is on hydrothermal alteration associated with volcanic hosted massive sulfide deposits.
