Metamorphic Origin of Ore-Forming Fluids for Orogenic Gold-Bearing Quartz Vein Systems in the North American Cordillera: Constraints from a Reconnaissance Study of  15N,  D, and  18O

Electron microprobe analyses of ore minerals and H–O, S isotope geochemistry of the Yuerya gold deposit, eastern Hebei, China: Implications for ore genesis and mineralization

“…O water values that are typical of magmatic fluids (5.5‰-9.5‰; Ohmoto, 1986;Sheppard, 1986) and similar to other Mesozoic granitoid-related gold deposits within the NCC (e.g., 4.5‰-5.7‰ for the Anjiayingzi gold deposit in Inner Mongolia, Li et al, 2004a;5.0‰-7.5‰ for the Qiyugou gold deposit in Henan Province, Fan et al, 2011), but distinctly lower than the values expected for orogenic gold deposits (e.g., 8‰-16‰ for gold deposits within the North American Cordillera, Jia et al, 2003;6.7‰-14.7‰ for the Sawayaerdun gold deposit within the Tianshan orogenic belt, Chen et al, 2012;6.9‰-11.2‰ for the Jinshan gold deposit in southern China, Zhao et al, 2013;7.8‰-12.2‰ for the Awanda gold deposit, Ding et al, 2014). These data indicate that the fluids that formed the Yuerya gold deposit are dominated by a magmatic component, as exemplified by the fact that the majority of the data for the deposit either overlap or plot close to the field for primary magmatic fluids (Fig.…”

“…Other data are from Kong et al (2013 fluids contain a proportion of mantle-derived and/or magmatic fluids. In addition, the δD values of ore-forming fluids associated with the Yuerya gold deposit are different from those associated with orogenic gold deposits associated with fluids that are presumed to have a metamorphic origin (e.g., −65‰ to −10‰ for gold deposits of the North American Cordillera, Jia et al, 2003; −71‰ to −46‰ for the Jinshan gold deposit within southern China, Zhao et al, 2013;−116.3‰ to −87.6‰ for the Awanda gold deposit within the Tarim Block of NW China, Ding et al, 2014), but are similar to numerous other Mesozoic granitoidrelated gold deposits within the NCC (e.g., −63.8‰ to −80.6‰ for the Sanshandao gold deposit within the Jiaodong gold province, Fan et al, 2003; −60.1‰ to −83.6‰ for the Qiyugou gold deposit in Henan Province, Fan et al, 2011). The δ…”

“…O values for quartz also differ from the compositions of quartz from numerous Archean to Cenozoic orogenic gold deposits (e.g., 14.6‰-22.2‰ for gold-bearing veins quartz within the North American Cordillera, Jia et al, 2003;16.2‰-17.6‰ for the Jinshan gold deposit, Zhao et al, 2013;15.9‰-20.3‰ for the Awanda gold deposit, Ding et al, 2014), but again are similar to numerous other Mesozoic granitoid-related gold deposits within the NCC (e.g., 10.2‰-13.7‰ for the Sanshandao gold deposit, Fan et al, 2003;10.3‰-11.9‰ for the Qiyugou gold deposit, Fan et al, 2011). The calculated δ…”

Fluid inclusion and stable isotope study of the Shagou Ag–Pb–Zn deposit, Luoning, Henan province, China: Implications for the genesis of an orogenic lode Ag–Pb–Zn system

“…Since the term of "orogenic gold deposit" was first used by Bohlke (1982) and comprehensively introduced by Groves et al (1998), this type of ore deposits has drawn great attention from scientists and explorers due to their scientific and economic significance (Chen, 2006;Fu et al, 2012;Goldfarb et al, 2001;Groves et al, 2003;Jia et al, 2003;Kerrich et al, 2000). Up to now, it has been widely accepted that orogenic gold deposits are one distinctive class of deposits that is usually hosted in metamorphic terranes and structurally controlled.…”

Controls on mineralisation in the Sierra Foothills gold province, central California, USA: a GIS-based reconnaissance prospectivity analysis

“…More recent studies in the Mother Lode, and comparisons with orogenic-gold provinces elsewhere, suggest a metamorphic origin of the vein-forming fluids, with the gold probably derived from suitable source rocks such as ultramafic and mafic rocks of the accreted oceanic and arc terranes (Albers 1981;Bö hlke & Kistler 1986;Bierlein et al 1998Bierlein et al , 2006aBö hlke 1999;Goldfarb et al 2001). Stable-isotope (H, N, O) data from hydrothermal micas and auriferous vein material in several major deposits in the Mother Lode Gold Belt also support a metamorphic origin of the ore-bearing fluids (Jia et al 2003).…”