Origin of bedding-concordant auriferous quartz veins, Meguma Terrane, Nova Scotia
DOI :
https://doi.org/10.4138/1584Résumé
Controversy surrounds the question of origin of bedding-concordant auriferous quartz veins occurring In Meguma Croup rocks of Nova Scotia. Several origins have been proposed, most important among which are I) that the veins formed pretectonically due to precipitation from submarine hydrothermal hot springs, and 2) that the veins are syntectonic and due to precipitation into hydraulic fractures from aqueous solutions. The fundamental differences between these two proposed origins have obvious consequences for studies of quartz and gold genesis and their location In this area. Microstructures of bedding-concordant veins from a number of localities in the Meguma Terrane show conclusive evidence of a syntectonic, multiple-hydraulic fracturing origin for the veins studied, and lend no support to the hot springs hypothesis. RÉSUMÉ On retrouve, dans les roches du groupe Meguma de la Nouvelle-Écosse, des veines de quartz auriferes, parallèles à la stratification, dont l’origine demeure un sujet controversyé. Plusieurs modes déformation ont été proposes dont les principaux sont: 1) un emplacement précfidant L’événement tectonique, par précipitation à partir de sources chaudes hydrothermales sous-marines; et 2) un emplacement syntec-tonique le long de fractures hydrauliques, par précipitation à partir de solutions aqueuses. Les différences fondamentales marquant ces deux modes d'origlne ont des conséquences importantes quant à l'étude de la genèse du quartz et de L’or afnsi qu'à leur présence dans cette région. Plusieurs sites dans le terrain Meguma font voir des veines concordantes à la stratification caractérisées par des microstructures qui indiquent de façon concluante L’origine syntectonique, par fractures hydrauliques multiples, de ces veines. L'hypothèse des sources chaudes est done écartfée. [Traduit par le journal]Téléchargements
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