Results 181 to 190 of about 10,467 (231)

Integrated radiometric and mineralogical investigation of radioactive mineralization in the El-Erediya Shear Zone, Eastern Desert, Egypt. [PDF]

Sci Rep
Rageh H, Abdel-Hakeem M, El-Tahir M, Zeid EA, Milano M, Abbas MA.   +5 more
europepmc   +1 more source

Radiometric characteristics of some metallic ores and nonmetallic deposits: an example, Wadi Al-Allaqi, South Eastern Desert, Egypt. [PDF]

Sci Rep
Gobashy MM, El-Sadek MA, Mekkawi MM, Araffa SAS, Ezz Eldin MM, Khalil MH.   +5 more
europepmc   +1 more source

Transient non-soluble noble metal transport in hydrothermal ore systems. [PDF]

Nat Commun
Cano N, González-Jiménez JM, Camprubí A, Morales-Casique E, González-Partida E.   +4 more
europepmc   +1 more source

Organic matter accumulation under the Middle-Upper Ordovician tectonic transition on the western margin of the North China platform. [PDF]

Sci Rep
Li F, Zhang D, Huang Z, Chen X, Xie M, Zhang Q, Li F, Wang Q, Wang X, Liu W.   +9 more
europepmc   +1 more source

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A metasedimentary source of gold in Archean orogenic gold deposits

Geology, 2021
AbstractThe sources of metals enriched in Archean orogenic gold deposits have long been debated. Metasedimentary rocks, which are generally accepted as the main metal source in Phanerozoic deposits, are less abundant in Archean greenstone belts and commonly discounted as a viable metal source for Archean deposits.
Iain K. Pitcairn, Nikolaos Leventis, Georges Beaudoin, Stephane Faure, Carl Guilmette, Benoît Dubé   +5 more
openaire   +1 more source

Aseismic Refinement of Orogenic Gold Systems

Economic Geology, 2020
Abstract 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., Willis, D., Tomkins, A.G., Wilson, C.J.L., Micklethwaite, S., Salvemini, F., Bougoure, J., Rickard, William   +7 more
openaire   +2 more sources

Coeval emplacement and orogen-parallel transport of gold in oblique convergent orogens

Tectonophysics, 2016
Abstract 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
openaire   +1 more source

Tectonic-Diffusion Estimate of Orogenic Gold Resources

Economic Geology, 2010
Age-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
openaire   +1 more source

Aseismic Refinement of Orogenic Gold Systems

2018
Orogenic gold deposits contribute the majority of gold recovered globally throughout history. However, the mechanism that concentrates gold to extremely high “bonanza” grades within these deposits remains enigmatic. The volume of fluid experimentally required to provide such endowments of gold in a localised area is not reflected in field observations (
Voisey, Christopher, Willis, David, Wilson, Chris, Micklethwaite, Steven, Tomkins, Andrew, Salvemin, Floriana   +5 more
openaire   +1 more source

Supergene gold mobility in orogenic gold deposits, Otago Schist, New Zealand

New Zealand Journal of Geology and Geophysics, 2015
Gold has been chemically mobilised by groundwater from host sulphide minerals in orogenic gold deposits of Otago. Mobilisation occurred near the Cenozoic Otago Schist erosional surface beneath a sedimentary cover. Initial Au mobilisation, on a scale of micrometres, occurred when solid solution and microparticulate gold in pyrite and arsenopyrite grains
D Craw, D MacKenzie, P Grieve
openaire   +1 more source