Results 171 to 180 of about 1,484 (210)
Metabasalts as sources of metals in orogenic gold deposits
Mineralium Deposita, 2014 Although metabasaltic rocks have been suggested to be important source rocks for orogenic gold deposits, the mobility of Au and related elements (As, Sb, Se, and Hg) from these rocks during alteration and metamorphism is poorly constrained. We investigate the effects of increasing metamorphic grade on the concentrations of Au and related elements in a ...
Pitcairn, Iain K. +2 more
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The giant Jiaodong gold province: The key to a unified model for orogenic gold deposits?
Geoscience Frontiers, 2016 Although the term orogenic gold deposit has been widely accepted for all gold-only lode-gold deposits, with the exception of Carlin-type deposits and rare intrusion-related gold systems, there has been continuing debate on their genesis. Early syngenetic
M Santosh
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Aseismic Refinement of Orogenic Gold Systems
Economic Geology, 2020Abstract Orogenic Au deposits have contributed the majority of Au recovered globally throughout history. However, the mechanism that concentrates Au to extremely high bonanza grades in small domains within these deposits remains enigmatic.
Voisey, C.R. +7 more
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A scale-integrated exploration model for orogenic gold deposits based on a mineral system approach [PDF]
Geoscience Frontiers, 2020 Concept-based orogenic gold exploration requires a scale-integrated approach using a robust mineral system model. Most genetic hypotheses for orogenic gold deposits that involve near-surface or magmatic-hydrothermal fluids are now negated in terms of a ...
M Santosh, Liang Zhang
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Coeval emplacement and orogen-parallel transport of gold in oblique convergent orogens
Tectonophysics, 2016Abstract Varying amounts of gold mineralisation is occurring in all young and active collisional mountain belts. Concurrently, these syn-orogenic hydrothermal deposits are being eroded and transported to form placer deposits. Local extension occurs in convergent orogens, especially oblique orogens, and facilitates emplacement of syn-orogenic gold ...
Phaedra Upton, Dave Craw
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Geology of the Lapa Orogenic Gold Deposit
2017Abstract The Cadillac mining camp is known for its numerous, but relatively small, orogenic gold deposits, which are spatially associated with the Larder Lake-Cadillac fault zone. The Lapa deposit, with a total endowment of 36 t Au (1.15 Moz), represents the largest gold deposit of the Cadillac mining camp.
Patrick Mercier-Langevin +6 more
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Introduction: Macraes Mine as an Orogenic Gold Deposit
2016Orogenic gold deposits are typically dominated by quartz veins in faults. Historic mining at Macraes focused on scattered small quartz veins, with only minor Au production. Modern exploration and mining has developed from these small beginnings into a world class mine operation which has produced >4 million ounces of Au from a total resource exceeding ...
Dave Craw, Doug MacKenzie
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Tectonic-Diffusion Estimate of Orogenic Gold Resources
Economic Geology, 2010Age-frequency data are used to determine amounts of vertical tectonic displacement experienced by the global population of orogenic gold deposits following their emplacement at a crustal depth of 10 ± 1 km. Knowledge of this tectonic dispersion allows for an estimate of the total crustal endowment of gold in orogenic gold deposits.
B. H. Wilkinson, S. E. Kesler
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Structural controls on orogenic gold deposits
Acta Petrologica Sinica, 2023Lin YANG +7 more
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A Biogeochemical Influence on the Secular Distribution of Orogenic Gold
Economic Geology, 2013Orogenic gold deposits are unevenly distributed in geologic time. The richest period of orogenic gold deposit formation was the Phanerozoic, which followed a >1-b.y. period of relatively meager deposit generation during the Proterozoic. This Proterozoic low-gold period developed despite continent-building episodes, which should have been appropriate ...
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