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- W2091206241 abstract "A zone of high alumina hydrothermal alteration (HAHA) is documented within granitoid rocks of the Big Indian Polyphase Intrusive suite (BIPI suite), which forms part of the Late Devonian-Early Carboniferous South Mountain Batholith (SHB). The alteration, which la confined to a NE-trending shear zone, is characterized by the quartz-deficient mineral assemblage andalusite-sillimanlte-spinel-oiuscovite-cordierite-apatite-pyrite. The HAHA zone represents the first reported occurrence of this alteration type within the South Mountain Batholith. Field observations indicate that the HAHA zone is only one of a series of successive and superimposed metasoraatic-hydrothermal events which, together with U-Cu-Ho + U-Cu mineralization, exhibit a transition in style from early pervasive to late fracture-controlled. This change in style within the BIPI suite is considered to reflect a progressive Increase in fluid pressure. Petrography and mineral chemistry suggest that the HAHA zone formed in response to the interaction of the leuco-monzogranlte host with a Na(+Al)-rich, siliea-undersaturated fluid. Although speculative, alumina may have been a mobile element transported as an alkali-complex via the fluid. High temperature mineral assemblages (gndalusite-aillimanite; andalusite-spinel) Indicate that the initial temperature of the aqueous fluid phase was ≥620oC for 2 kb pressure. It la proposed that the fluid phase represents a residual magmatic-fluid which was accessed by deep-seated fracturing. RÉSUMÉ On documenté une zone d'altération hydrothermale hautement alumlneuse (AHHA) à l'intérieur des granitoides de la suite intrusive Polyphasée de Big Indian (suite IPBI) qui fait partie du Batholite de South Mountain (BSM) d'âge tardidévonien à éocarbonifère. Confinée à une zone de cisaillement A tendance NE, l'altération est caractérisée par un assemblage de minéraux, deficient en quartz, à andalousite-sillimanite-spinelie-museovite-cordierite-apatite-pyrite. La zone AHHA représente la première mention de ce type d'altération à l'intérieur du BSM. D'après les observations sur le terrain, cette zone AHHA n'est qu'un d'une serie d'evenements métasomatiques et hydrothermaux successifs et superposes qui. ainsl qu'une minéralisation en W-Cu-Mo+U-Cu. exbibent un style d'abord pénétrant et enfin filonlen. On consideré que ce changement de style A l'intérieur de la suite IPBI représente un accroissement progressif de la pression des fluides. La pétrographie et le chimisme des minéraux tendent à montrer que la zone AHHA e'est établie en reponse à l'intersction de l'encaissant leucomonzogranitique avec un fluide sous-sature en silice et riche en Na±Al. Bien que cela reste speculatif, l'alumine pourrait avoir été un élément mobile transports par le fluide à l’état de complexe alcalln. D'après les assemblages de minéraux A haute température (andalousite-sillimanite; andalousite-spinelie), la température inltiale de la phase aqueuse fluide était ≥620oC pour une pression de 2 kb. On propose que la phase fluide représente un fluide magmatique residuel extrait par une fracturation en profondeur. [Traduit par le journal]" @default.
- W2091206241 created "2016-06-24" @default.
- W2091206241 creator A5043155543 @default.
- W2091206241 date "1988-04-01" @default.
- W2091206241 modified "2023-10-01" @default.
- W2091206241 title "An occurence of metasomatic aujminosilicates related to high alumina hydrothermal alteration within the South Mountain Batholith, Nova Scotia" @default.
- W2091206241 doi "https://doi.org/10.4138/1642" @default.
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