In:
Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 59, No. 10 ( 2022-10-01), p. 722-743
Abstract:
In orogenic gold systems, the source of the fluids and the processes leading to mobilization, transport, and deposition of gold remain debated. Most studies focus on endowed rather than on gold-poor orogenic systems to unravel the “key” parameters of gold mineralizing processes. Here, we present stable isotope (O, H) data from the Moly-Desgagné–Guercheville fault system (gold-free to low gold endowment) in the Chibougamau area, Abitibi greenstone belt, Canada. The gold-free Moly-Desgagné showing and nearby poorly endowed Hazeur showing and Monster Lake deposit share similar features typical of orogenic systems. The stable isotope compositions of tourmaline and quartz from the Moly-Desgagné–Guercheville fault system also display similar characteristics, such as (1) temperature of vein formation of 345 ± 86 °C (1σ); (2) fluid mixing between an upper crustal reservoir (low T – high δD – low δ 18 O) and a metamorphic water reservoir (high T – low δD – high δ 18 O); and (3) positive δD fluid values consistent with multiple boiling-condensation cycles related to fault-valve processes. These characteristics are similar to those from the gold-endowed Val-d’Or vein field. The difference in gold endowment between the Moly-Desgagné–Guercheville and Val-d’Or vein fields may be related to the nature of the fault system (i.e., terrane-bounding or “intragreenstone belt”) and the volume and (or) composition (i.e., gold, its ligands, CO 2 ) of the fluid source rocks.
Type of Medium:
Online Resource
ISSN:
0008-4077
,
1480-3313
DOI:
10.1139/cjes-2021-0162
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2022
detail.hit.zdb_id:
417294-2
detail.hit.zdb_id:
1491201-6
SSG:
16,13
