Age And Fluid Chemistry Of Sediment Hosted Disseminated Gold Deposits In The Great Basin Nevada Gold Deposits Ion Probe Copper Potassium Argon
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Age And Fluid Chemistry Of Sediment Hosted Disseminated Gold Deposits In The Great Basin Nevada Gold Deposits Ion Probe Copper Potassium Argon
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Author : Gregory Bonarr Arehart
language : en
Publisher:
Release Date : 1992
Age And Fluid Chemistry Of Sediment Hosted Disseminated Gold Deposits In The Great Basin Nevada Gold Deposits Ion Probe Copper Potassium Argon written by Gregory Bonarr Arehart and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Geology categories.
from evolved meteoric fluids rather than seawater.
Fluid Chemical Studies Of Gold Systems
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Author : Mitchell James Kerr
language : en
Publisher:
Release Date : 2019
Fluid Chemical Studies Of Gold Systems written by Mitchell James Kerr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Despite several decades of study, the source(s) of gold and mineralizing fluids, and the mechanisms responsible for gold precipitation remain controversial. In particular, there is a need to improve: (i) the identification of secondary gold upgrading processes that lead to very highgrade gold zones; (ii) the understanding of precipitation mechanisms in carbonaceous material (CM)-bearing metasedimentary systems (i.e., slate belts); and (iii) the exploration criteria for the cryptic, finely disseminated gold mineralization in CM-bearing metamudstone lithologies. The combined results of an extensive in situ microanalytical protocol (SEM, confocal Raman microspectroscopy, microthermometry, decrepitate mound analysis, LA-ICP-MS, cathodoluminescence, SIMS) has idenitified evidence of secondary gold enrichment at the Madrid deposit, Hope Bay Greenstone Belt, NU, Canada, resulting from the addition of new gold onto an earlier orogenic quartz-carbonate vein deposit by magmatic-hydrothermal fluids. This conclusion is based on robust textural, mineralogical, and fluid inclusion evidence. The geological setting and mineral-chemical features suggest an intrusion-related (i.e., porphyry), or intermediate-sulfidation epithermal mineralization style for the later event. This work provides another example of the importance of compositionally distinct cumulative hydrothermal events in the development of high-grade gold deposits in orogenic settings. The Dufferin deposit, NS, Canada, is a vein-type system hosted in CM-bearing metasedimentary rocks. A detailed fluid inclusion study strongly suggests that Au mineralization occurred through coupled fluid fO2 reduction (via interaction with CM) and pH increase, leading to efficient Au precipitation from an Au-undersaturated aqueous-carbonic fluid. This study presents one of the few examples of measured Au concentrations in ore fluids in an economic orogenic Au deposit and reports direct evidence for the genetic relationship between Au and CM in metasedimentary lithologies. The results of this study show that, despite mineralizing fluids being Auundersaturated, they may still produce economic deposits through highly efficient precipitation processes. The Moose Rive anticline, NS, Canada, hosts a number of, commonly inconspicuous, metasediment-hosted disseminated Au deposits. An initial study using an on-line, rock-crushing gas chromatographic technique identified bulk fluid differences (CO2 and hydrocarbon abundances) between gold-bearing and gold-barren parcels of metasedimentary rock. This work suggests that bulk fluid characteristics may be a viable exploration vector for disseminated gold systems.
Fluid Chemistry And Hydrothermal Alteration Of The Cresson Disseminated Gold Deposit Cripple Creek Colorado
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Author : William J. Burnett
language : en
Publisher:
Release Date : 1995
Fluid Chemistry And Hydrothermal Alteration Of The Cresson Disseminated Gold Deposit Cripple Creek Colorado written by William J. Burnett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Geology categories.
Gold Metallogeny And Exploration
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Author : R. P. Foster
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Gold Metallogeny And Exploration written by R. P. Foster and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Within the last decade, the high and continuing demand for gold has prompted a global gold rush on a scale never before seen, not even in the heady days of Ballarat, California and the Yukon. Gold is being sought on every continent and, with very few exceptions, in every country around the world. Such interest and fierce competition has demanded considerable innovation and improvement in exploration techniques paralleled by a rapid expansion of the geological database and consequent genetic modelling for the many different types of gold deposits now recognized. This proliferation of data has swamped the literature and left explorationist and academic alike unable to sift more than a small proportion of the accumulating information. This new book represents an attempt to address this major problem by providing succinct syntheses ofall major aspects ofgold metallogeny and exploration, ranging from the chemical distribution of gold in the Earth's crust, and the hydrothermal chemistry of gold, to Archaean and Phanerozoic lode deposits, epithermal environments, chemical sediments, and placer deposits, and culminates in chapters devoted to geochemical and geophysical exploration, and the economics of gold deposits. Each chapter is written by geoscientists who are acknowledged internationally in their respective fields, thus guaranteeing a broad yet up-to-date coverage. In addition, each chapter is accompanied by reference lists which provide readers with access to the most pertinent and useful publications.
Potassic Igneous Rocks And Associated Gold Copper Mineralization
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Author : Daniel Müller
language : en
Publisher: Springer
Release Date : 2013-04-17
Potassic Igneous Rocks And Associated Gold Copper Mineralization written by Daniel Müller and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-17 with Science categories.
In recent years, there has been increasing interest from geoscientists in potassic ig neous rocks. Academic geoscientists have been interested in their petrogenesis and their potential value in defining the tectonic setting of the terranes into which they were intruded, and exploration geoscientists have become increasingly interested in the association of these rocks with major epithermal gold and porphyry gold-copper deposits. Despite this current interest, there is no comprehensive textbook that deals with these aspects of potassic igneous rocks. This book redresses this situation by elucidating the characteristic features of potassic (high-K) igneous rocks, erecting a hierarchical scheme that allows interpre tation of their tectonic setting using whole-rock geochemistry, and investigating their associations with a variety of gold and copper-gold deposits, worldwide. About two thirds of the book is based on a PhD thesis by Dr Daniel Muller which was produced at the Key Centre for Strategic Mineral Deposits within the Department of Geology and Geophysics at The University of Western Australia under the supervision of Professor David Groves, the late Dr Nick Rock, Professor Eugen Stumpf!, Dr Wayne Taylor, and Dr Brendon Griffin. The remainder of the book has been compiled from the literature using the collective experience of the two authors. The book is dedi cated to the memory of Dr Rock who initiated the research project but died before its completion.
Skarns In British Columbia
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Author : Gerald E. Ray
language : en
Publisher:
Release Date : 1997
Skarns In British Columbia written by Gerald E. Ray and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Science categories.
Skarns in British Columbia have historically been important sources of iron, tungsten, copper, and gold. This publication begins with an introduction on skarn terminology and the problems of skarn identification. It then reviews a genetic model of skarn formation and presents descriptive profiles of eight types of skarn deposits; describes the database of at least 735 skarn occurrences in the province, and the number and distribution of skarns in British Columbia according to their associations, class, age, and distribution; and notes the ages of British Columbia skarns and the total production of various metals extracted from British Columbia skarns. Subsequent sections provide information on assays and metal ratios of mineralized skarns, skarn mineralogy, skarn mineral chemistry, chemistry of skarn-related intrusions, and the mapping and evaluation of skarns. The appendix contains a listing of 735 skarn occurrences in British Columbia, giving deposit name, MINFILE number, latitude/longitude, elements and minerals present, and associated rocks and their ages.
Geochemistry
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Author : Lester Hanks
language : en
Publisher:
Release Date : 2016-09-01
Geochemistry written by Lester Hanks and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-01 with categories.
Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans. The realm of geochemistry extends beyond the Earth, encompassing the entire Solar System and has made important contributions to the understanding of a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The Earth is part of a closely related family of heavenly bodies, our Solar System, that formed simultaneously. Hence, the realm of geochemistry extends beyond the Earth to encompass the entire Solar System. The goals of geochemistry are thus no different from those of other fields of earth science; just the approach differs. The contributions of geochemistry to this advance have been simply enormous. Geochemists study the composition, structure, processes, and other physical aspects of the Earth. They examine the distribution of chemical elements in rocks and minerals, as well as the movement of these elements into soil and water systems. There is a wealth of information buried in the liquids, gases, and mineral deposits of rock. Understanding the chemical composition of rocks tells oil companies where to drill for oil; enables scientists to put together broad-based theories about the way the Earth is changing; helps environmental management companies decide how to dispose of a toxic or hazardous substance; and steers mining companies toward use of natural resources with a minimum. Geochemistry - Earth's System Processes brings together the knowledge from a variety of topics within the field of geochemistry. The audience for this book consists of a multitude of scientists such as physicists, geologists, technologists, petroleum engineers, volcanologists, geochemists and government agencies.
Scientific Investigations Report
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Author : Sharon E. Kroening
language : en
Publisher:
Release Date : 2004
Scientific Investigations Report written by Sharon E. Kroening and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Earth sciences categories.
Usgs Research On Mineral Resources 1991
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Author : Elizabeth E. Good
language : en
Publisher:
Release Date : 1990
Usgs Research On Mineral Resources 1991 written by Elizabeth E. Good and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Mines and mineral resources categories.
Principles Of Geochemical Prospecting
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Author : Herbert Edwin Hawkes
language : en
Publisher:
Release Date : 1957
Principles Of Geochemical Prospecting written by Herbert Edwin Hawkes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with Geochemical prospecting categories.