Development of High-Silica Adakitic Intrusions in the Northern Appalachians of New Brunswick (Canada), and Their Correlation with Slab Break-Off: Insights into the Formation of Fertile Cu-Au-Mo Porphyry Systems

• Published in: Geosciences
• Main Authors: Fazilat Yousefi, David R. Lentz, James A. Walker, Kathleen G. Thorne
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2024
• Subjects: high-silica adakite; New Brunswick; northern Appalachians; slab break-off; fertile Cu-Au-Mo porphyry systems; Geology; QE1-996.5; Blue Mountain; Canada; Gulch; North Pole; Sugar Loaf; Tower Hill; Verte
• Online Access: https://doi.org/10.3390/geosciences14090241; https://doaj.org/article/df1b3d5848444d209a1a1424678bba58

High-silica adakites exhibit specific compositions, as follows: SiO 2 ≥ 56 wt.%, Al 2 O 3 ≥ 15 wt.%, Y ≤ 18 ppm, Yb ≤ 1.9 ppm, K 2 O/Na 2 O ≥ 1, MgO < 3 wt.%, high Sr/Y (≥10), and La/Yb (>10). Devonian I-type adakitic granitoids in the northern Appalachians of New Brunswick (NB, Canada) share...