Heidarian, Hassan; Lentz, David R.; Thorne, Kathleen G.; McFarlane, Christopher R.M. (2025) Mineralogy, geochronology, and stable isotope geochemistry of gold mineralization in the Belleisle Bay and Annidale groups, southwestern New Brunswick, Canada. Ore Geology Reviews, 186. 106899 doi:10.1016/j.oregeorev.2025.106899
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Mineralogy, geochronology, and stable isotope geochemistry of gold mineralization in the Belleisle Bay and Annidale groups, southwestern New Brunswick, Canada | ||
| Journal | Ore Geology Reviews | ||
| Authors | Heidarian, Hassan | Author | |
| Lentz, David R. | Author | ||
| Thorne, Kathleen G. | Author | ||
| McFarlane, Christopher R.M. | Author | ||
| Year | 2025 | Volume | < 186 > |
| Page(s) | 106899 | ||
| URL | |||
| DOI | doi:10.1016/j.oregeorev.2025.106899Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 19026959 | Long-form Identifier | mindat:1:5:19026959:5 |
| GUID | 0 | ||
| Full Reference | Heidarian, Hassan; Lentz, David R.; Thorne, Kathleen G.; McFarlane, Christopher R.M. (2025) Mineralogy, geochronology, and stable isotope geochemistry of gold mineralization in the Belleisle Bay and Annidale groups, southwestern New Brunswick, Canada. Ore Geology Reviews, 186. 106899 doi:10.1016/j.oregeorev.2025.106899 | ||
| Plain Text | Heidarian, Hassan; Lentz, David R.; Thorne, Kathleen G.; McFarlane, Christopher R.M. (2025) Mineralogy, geochronology, and stable isotope geochemistry of gold mineralization in the Belleisle Bay and Annidale groups, southwestern New Brunswick, Canada. Ore Geology Reviews, 186. 106899 doi:10.1016/j.oregeorev.2025.106899 | ||
| In | Link this record to the correct parent record (if possible) | ||
| Abstract/Notes | The New River and Annidale belts host several orogenic-related gold mineralized zones in southern New Brunswick, Canadian Appalachians. Gold mineralized samples were examined from the Devil Pike Brook deposit (New River Belt) and the Sheba Pit, North Fuchsite Zone, South Fuchsite Zone, East Scotch Settlement – BP, Grant Brook West, Henderson Settlement occurrences, and the Bald Hill deposit from the Annidale Belt. Almost all the gold mineralized zones are characterized by a typical alteration halo (chlorite, sericite, and fuchsite) directly related to auriferous quartz-carbonate veins hosted by greenstone belt volcano-sedimentary rocks and associated mafic dykes. The mineralization likely formed under greenschist facies conditions (300–450 °C), similar to other orogenic systems in the Canadian Appalachians. The ages obtained for the North Fuchsite Zone (U-Pb rutile age; 482 ± 16 Ma) and East Scotch Settlement – BP (40Ar–39Ar age; 466.6 ± 4.3 Ma) occurrences indicate an Early to Middle Ordovician age for the mineralization. This time interval coincides with the Penobscot orogeny, followed by the emplacement of the Stewarton Gabbro (479 ± 2 Ma) shortly after the orogeny. This period is considered the primary event for gold mineralization in the Annidale area. The ages related to the auriferous Bald Hill Sb deposit (40Ar–39Ar age; 422.8 ± 5.6 Ma), the Sheba Pit gold occurrence (40Ar–39Ar age; 394 ± 17 Ma), and the Devil Pike Brook gold deposit (U-Pb rutile age; 348 ± 46 Ma) are younger than the North Fuchsite Zone and East Scotch Settlement – BP occurrences. These young ages are considered resetting ages due to several subsequent tectonic events (Salinic, Acadian, and Neoacadian orogenies) after the main mineralization event. However, based on structural relationships, the auriferous Bald Hill Sb deposit is interpreted as a younger system. The O isotopic results for quartz in the auriferous quartz veins from most gold occurrences in the Annidale Belt (δ18O +10.9 to +16.0 ‰) values fall within the typical range associated with metamorphic fluids. Sulphide minerals extracted from most gold occurrences within the Annidale Belt exhibit a δ34S range between 4.4 and 12.0 ‰, which aligns with the typical signature of fluids associated with orogenic gold deposits. In contrast, the δ34S results for the auriferous Bald Hill Sb deposit are close to 0.0 ‰, a characteristic indicative of sulphides originating from the mantle or through leaching of magmatic rocks. The Pb isotope values for this study indicate a heterogeneous lead source involving isotopic mixing between mantle, upper crust, and lower crust sources. These findings considered the Penobscot orogeny as a key gold-forming event in southern New Brunswick. They also suggest the presence of younger, possibly magmatic-hydrothermal systems such as Bald Hill. The results provide critical insights into fluid sources and the timing of mineralization. | ||
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