Atlas of Alteration Assemblages, Styles and Zoning in Orogenic Lode-gold Deposits in a Variety of Host Rock and Metamorphic Settings PDF Download
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Author:
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages : 68
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Book Description
Author:
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages : 68
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Book Description
Author: Franco Pirajno
Publisher: Springer Science & Business Media
ISBN: 140208613X
Category : Science
Languages : en
Pages : 1250
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Book Description
Hydrothermal processes on Earth have played an important role in the evolution of our planet. These processes link the lithosphere, hydrosphere and biosphere in continuously evolving dynamic systems. Terrestrial hydrothermal processes have been active since water condensed to form the hydrosphere, most probably from about 4.4 Ga. The circulation of hot aqueous solution (hydrothermal systems) at, and below, the Earth’s surface is ultimately driven by magmatic heat. This book presents an in-depth review of hydrothermal proceses and systems that form beneath the oceans and in intracontinental rifts, continental margins and magmatic arcs. The interaction of hydrothermal fluids with rockwalls, the hydrophere and the biophere, together with changes in their composition through time and space, contribute to the formation of a wide range of mineral deposit types and associated wallrock alteration. On Earth, sites of hydrothermal activity support varied ecosystems based on a range of chemotrophic microorganisms both at surface and in the subsurface. This book also provides an overview of hydrothermal systems associated with meteorite impacts and explores the possibility that hydrothermal processes operate on other terrestrial planets, such as Mars, or satellites of the outer planets such as Titan and Europa. Possible analogues of extraterrestrial putative hydrothermal processes pose the intriguing question of whether primitive life, as we know it, may exist or existed in these planetary bodies. Audience: This volume will be of interest to scientists and researchers in geosciences and life sciences departments, as well as to professionals and scientists involved in mining and mineral exploration.
Author: V. Juhani Ojala
Publisher:
ISBN:
Category : Gold ores
Languages : en
Pages : 276
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Book Description
Author: Steffen Gerd Hagemann
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 584
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Book Description
Author: P.S. Garofalo
Publisher: Geological Society of London
ISBN: 1862396574
Category : Science
Languages : en
Pages : 266
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Book Description
Hydrothermal ore deposits that are exploited for gold include both gold-only deposits, such as orogenic deposits, and gold-bearing examples of the common hydrothermal deposits types that are formed around upper-crustal magmatic centres, in particular porphyry and epithermal deposits. Fluid-inclusion data have shown that ore fluids of gold-only deposits are compositionally distinct compared to fluids of other deposit types. This Special Publication includes an up-to-date summary of thermodynamic parameters of aqueous Au species at high temperatures and pressures; a dataset of fluid inclusion properties and compositions from orogenic deposits of different parts of the world; several comprehensive case studies of different types of gold deposits and their fluids from USA, Brazil, Egypt, Slovakia and Bulgaria; and numerical modelling aimed to define key parameters that affect fluid flow and gold deposition at a range of scales.
Author: Ed DeWitt
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 44
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Book Description
Author: Ted G. Theodore
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 308
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Book Description
Author: Neil Phillips
Publisher: Springer Nature
ISBN: 981163081X
Category : Science
Languages : en
Pages : 294
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Book Description
This book addresses the origin of gold deposits to answer questions of science and curiosity. These answers contribute in turn to the improved exploration and mining of gold. Initially there is a summary of the methods used to address the genesis of gold deposits including some of the essential science and concepts. Five basic observations follow that apply to many gold deposits and need to be considered in any genetic ideas. Magmatic processes enriching gold are discussed followed by the role of aqueous fluids during gold deposit formation at elevated temperatures and pressures. Modifying effects after deposit formation include high-grade metamorphism, retrogression, weathering, and erosion. The main types of gold deposits are then explained within the spectrum of viable genetic ideas, with informal names for these examples that include gold-only, gold-plus, Carlin, slate-belt, epithermal, porphyry, iron oxide copper gold, and Archean greenstone. Case histories are included in which the role of gold geology contributed directly to discoveries—one example is at the province-scale and another at the goldfield-scale. Unlike other books on the subject, this one addresses virtually all gold deposit types rather than focusing on one type in isolation. The primary readership includes industry geologists, senior undergraduates, postgraduates, and those with some knowledge of science and an interest in the gold industry.
Author: Rodney Allen
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 140
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Book Description
Author: A. C. Colvine
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 164
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Book Description
