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- W2104965543 abstract "The New Cornwall syenogranite is a 1.7 km2 intrusion at the southern margin of the Whale Lake monzogranitc of the South Mountain Batholilh of southwestern Nova Scotia- It has a mean SiO2 content of 75 8%, and contains accessory amounts of tourmaline, andalusite, and primary muscovitc. Ratios such as A/CNK (~ 1.25). Rb/K (~215), and Nb/Ta (- 3.5) show that the syenogranitc is not highly fractionated. Although binary clement plots for some elements show the same regular trend for both monzogranite and syenogranite, variations in trace elements such as Rb, Ha, Th and LREE show that the syenogranite is not derived from the monzogranite by fractional crystalli7ation, as the syenogranite has lower Eu and HREE compared with the monzogranite. Similarities in LREE, Nd isotope composition (ℇNd ~ -2) and other geochemical indicators between monzogranite and syenogranitc suggest that they were derived by partial melting of a common source Both the Whale Lake monzogranite and the New Cornwall syenogranite then evolved independently by fractional crystallization and late fluids played only a minor role in the further evolution of the syenogranitc. This represents a third mode of development of mineralized leucogranite in the South Mountain Batholith, in addition to the previously recognized associated and independent leucogranitc RÉSUMÉ Le syénogranitc de New Cornwall constituc une intrusion de 1.7 kilomètre carré sur la limite méridionale du granite monzonitique du lac Whale, lequcl fait panic du batholithe du mont South, dans le sud-ouest de la Nouvelle-Écosse. Il a une teneur moyenne en Si02 de 75.8 %, et renferme des quantités accessoires de tourmaline, d'andalousite et de muscovite primaire. Les rapports d'A/CNK (~ 1,25), de Rb/K (~ 215) et de Nb/Ta (~ 3,5) révèlent que le syénogranite n'est pas extrémement fractionné. Même si les représentaions graphiques des éléments binaires de certains éléments révèlent la même tendance régulière dans le cas du granite monzonitique et du syénogranite, les variations des éléments traces comme le Rb, lc Ba, lc Th et les éléments de terres rares légers signalent que le syénogranite ne provient pas du granite monzonitique par cristallisation fractionnairc, car le syénogranite posséde des teneurs moindres en Eu et en éléments de terres rares légerds, la comparativement au granite monzonitique. Les similantés existantes en ce qui conceme les éléments de terres rares légers, la composition en isotopes de Nd (ℇNd ~ -2) et d'autres mdicatcurs gêochimiques entrc le granite monzonitique et le syénogranite permettent de supposer qu'ils proviennent d'une fonte partielle d'une source commune. Le granite monzonitique du lac Whale et le syénogranite de New Cornwall ont ensuite tous deux évolué indépendamment par cristallisation fractionnaire et lcs fluides tardifs ont seulement joué un rôle secondairé dans l'évolution ulténeure du syénogranite. Il s'agit la d'un troisieme mode de développemcnt du leucogranitc minéralisé dans le batholithe du mont South, qui s'ajoute aux leucogranites « assoaés » et « indépendants » dèjà rcconnus Traduit par la rédaction" @default.
- W2104965543 created "2016-06-24" @default.
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- W2104965543 date "2001-10-01" @default.
- W2104965543 modified "2023-10-01" @default.
- W2104965543 title "The New Cornwall syenogranite, Nova Scotia: petrology and geochemistry" @default.
- W2104965543 doi "https://doi.org/10.4138/1975" @default.
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