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GeoRef Categories
Era and Period
Book Series
Date
Availability
Samhwanghak Mine
Jurassic mesothermal gold mineralization of the Samhwanghak Mine, Youngdong area, Republic of Korea; constraints on hydrothermal fluid geochemistry Available to Purchase
Epithermal Precious Metal Deposits in South Korea—History and Pursuit Available to Purchase
PLUME-RELATED OCEANIC PLATEAUS AS A POTENTIAL SOURCE OF GOLD MINERALIZATION Available to Purchase
Pb ISOTOPE COMPOSITIONS OF PYRITE FROM THE C QUARTZ-TOURMALINE VEIN OF THE SISCOE GOLD DEPOSIT, VAL D’OR, QUEBEC: CONSTRAINTS ON THE ORIGIN AND AGE OF THE GOLD MINERALIZATION Available to Purchase
Gold-Bearing Mesothermal Veins from the Gubong Mine, Cheongyang Gold District, Republic of Korea: Fluid Inclusion and Stable Isotope Studies Available to Purchase
SEG Discovery 125 (April) Available to Purchase
Phanerozoic Orogenic Lode Gold Deposits Available to Purchase
Abstract Phanerozoic lode gold deposits are invariably associated with convergent plate margins and occur within close proximity to major translithospheric structures or compressional to transpressional-transtensional shear zones. The deposits are almost entirely structurally controlled and the nature of the immediate host rock does not generally play an integral part in ore formation. Nonetheless and unlike the majority of their Archean and Proterozoic analogues, Phanerozoic lode gold deposits are primarily hosted in several kilometer-thick sequences of marine sedimentary rocks which accumulated on pre-collision continental margins and/or in prograding arc-trench complexes. The sedimentary successions are commonly under lain by, and interspersed with, bimodal volcanogenic rocks which formed as a result of magmatic processes related to spreading, arc formation, plate collision, and subduction. The largest Phanerozoic lode gold systems are found in sub- to medium-grade greenschist metamorphosed terranes which have been caught up in the accretion of one or more allochthonous microplates and associated oceanic crust to an active continental margin. Mineralization in these collisional settings closely follows peak meta-morphism of the immediate host rocks and is temporally associated with exhumation of the orogen and addition of heat into the thickened crust via lithospheric delamination processes. Generation of CO 2 -rich aqueous ore-forming fluids involves metamorphic devolatilization of subcreted hydrated crust and the devel op ment of laterally and vertically extensive hydrothermal plumbing systems. Rich Phanerozoic lode gold deposits display a very close spatial and temporal relationship with syn- to post-tectonic felsic intrusive rocks but generally predate the emplacement of the granitoids. The deposits typically consist of quartz gold lodes in fault and shear systems at or above the brittle-ductile transition and form at P-T conditions of 1 to 3kbars and 250° to 400°C: they are characterized by relatively straightforward parageneses and a lack of pronounced vertical mineral or ore zonation. Episodic brittle reactivation in response to short-lived tectonic pulses is common and can result in remobilization of pre-existing mineralization and the formation of secondary lode systems. Alteration halos around Phanerozoic lode gold systems vary from a few centimeters to several tens of meters and reflect variations in the host-rock lithology and reactivity, permeability and porosity, orientation of bedding in metasedimentary rocks relative to auriferous veins, and fluid composition. On the deposit scale, lithogeochemical information obtained from wall-rock alteration assemblages represents by far the most valuable exploration tool. Broad bleached zones characterized by carbonate, sulfide, and sericite altera tion surrounding mineralized zones provide an exploration target of increased magnitude. Geochemical traverses generally indicate depletion of Na 2 O and increased values of CO 2 , H 2 O, K 2 O, S, As, Au, and possibly Sb, within five to several tens of meters from the auriferous lodes.