The Lithogeochemical and Mineralogical Setting of Turbidite Hosted Arsenic-gold Deposits in the Lower Palaeozoic of Scotland PDF Download
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Author: Paul R. Duller
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Paul R. Duller
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: P. Stone
Publisher: Stationery Office Books (TSO)
ISBN:
Category : Science
Languages : en
Pages : 140
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The Rhins of Galloway district lies in the south-west of Scotland and marks the termination of the Southern Uplands against the North Channel. This memoir and the accompanying 1:50 000 solid geology map provide detailed subdivision of the Ordovician and Silurian turbidite strata. The conclusions are of significance to the Southern Uplands terrane as a whole and also to its equivalents in Ireland and maritime Canada. Other major sections of the memoir discuss the syn- and post-tectonic intrusive rocks, the development of the late Palaeozoic Stranraer half-graben and the regional structural framework as deduced from geophysical data.
Author: British Library. Document Supply Centre
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 832
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1056
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Theses on any subject submitted by the academic libraries in the UK and Ireland.
Author: Matthew Francis Mann
Publisher:
ISBN: 9781369885842
Category : Geochemistry
Languages : en
Pages : 128
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Book Description
Invisible gold is a type of gold ore that consists of micrometer sized blebs of native gold and structurally bound gold in iron sulfides, most commonly pyrite, arsenian pyrite and arsenopyrite. Invisible gold is found in hydrothermal-type gold deposits, can make up a large percentage of the gold found in that deposit, and has been noted to be related directly to the arsenic concentration of the crystal, with increasing arsenic concentrations correlating with increasing gold concentrations. The relationship between arsenic and gold was evaluated by conducting experiments at 200 °C, 300 °C, 400 °C, 500 °C and 600 °C. Pyrite or arsenopyrite seed crystals were placed into quartz or silica-based glass vessels with a synthetic hydrothermal fluid and metallic gold for a minimum and maximum of 60 and 370 days, respectively. Run products were analyzed by electron microprobe and laser ablation inductively coupled plasma mass spectrometry. Gold concentrations in arsenopyrite and pyrite rims ranged from 0.058 to 0.685 and 0.011 to 0.073 microg/g at 200 °C, respectively. Gold concentrations were 0.194 to 2.641 and 0.076 to 0.324 microg/g at 600 °C in the rims of arsenopyrite and pyrite, respectively. Gold concentrations were higher in the rims of run product crystals and lower in the crystal cores and were found to increase with increasing temperature. This study showed that the presence of arsenic enhanced the concentration of gold in pyrite and arsenopyrite at the conditions of the experiments, but, the concentrations observed were lower than concentrations observed in some natural samples, which can reach up to 10,000 microg/g. This suggests that surficial processes, most likely through chemisorption and/or electrosorption during crystal growth, attract gold ions, atoms, and/or molecules to the surface of the mineral to aid in enhancing gold concentrations in arsenic-bearing minerals.
Author: Simon A. Lomas
Publisher: Geological Society of London
ISBN: 9781862391499
Category : Science
Languages : en
Pages : 340
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This publication reflects a growing appreciation of the extent to which turbidite depositional system development is fundamentally affected by basin-floor topography. In the many turbidite and turbidite hydrocarbon reservoirs, depositional patterns have been moderately to strongly confined by pre-existing slopes. This volume examines aspects of sediment dispersal and accumulation in deep-water systems where sea-floor topography has exerted a decisive control on deposition, and explores the associated controls on hydrocarbon reservoir architecture and heterogeneity.
Author: Mitchell James Kerr
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
Author: Walter L. Pohl
Publisher: John Wiley & Sons
ISBN: 144439486X
Category : Science
Languages : en
Pages : 725
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Book Description
Humanity’s ever-increasing hunger for mineral raw materials, caused by a growing global population and ever increasing standards of living, has resulted in economic geology becoming a subject of urgent importance. This book provides a broad panorama of mineral deposits, covering their origin and geological characteristics, the principles of the search for ores and minerals, and the investigation of newly found deposits. Practical and environmental issues that arise during the life cycle of a mine and after its closure are addressed, with an emphasis on sustainable and "green" mining. The central scientific theme of the book is to place the extraordinary variability of mineral deposits in the frame of fundamental geological processes. The book is written for earth science students and practicing geologists worldwide. Professionals in administration, resource development, mining, mine reclamation, metallurgy, and mineral economics will also find the text valuable. Economic Geology is a fully revised translation of the the fifth edition of the German language text Mineralische und Energie-Rohstoffe. Additional resources for this book can be found at: www.wiley.com/go/pohl/geology. The author's website can be found at: http://www.walter-pohl.com.
Author: R. P. Foster
Publisher: Springer Science & Business Media
ISBN: 1461304970
Category : Science
Languages : en
Pages : 447
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Book Description
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.
Author: A. G. Sleeman
Publisher:
ISBN: 9781899702213
Category : Estuaries
Languages : en
Pages : 77
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