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Geological mapping and U-Pb (zircon) dating have led to the discovery of distinctive Lower Ordovician volcano-sedimentary rocks in the Annidale area of southern New Brunswick. These rocks are included in a newly defined group, herein termed the Annidale Group, which is divided into three fault bounded(?) units of partially overlapping age. These units are named the East Scotch Settlement Formation, the Lawson Brook Formation and the Canaan Forks sequence, from south to north. The East Scotch Settlement Formation contains a steeply dipping succession of mixed mafic and felsic volcanic rocks and a variety of clastic and volcanogenic sedimentary rocks. The Lawson Brook Formation constitutes a shallowly to moderately north-dipping succession dominated by felsic volcanic rocks. The Canaan Forks sequence, most of which constitutes a shallowly to moderately north-dipping succession, is dominated by clastic sedimentary rocks. Structurally, much of the Annidale Group is characterized by intense shearing produced by numerous vertical northeast- and northwest-trending faults and by southward- and northward-directed thrust faults. In the vicinity of these structural features, the East Scotch Settlement Formation is further characterized by pervasive carbonatization that is commonly accompanied by base-metal- and gold-bearing silicification and high chromium-mica alteration zones.  Zircons from a felsic dome in the East Scotch Settlement Formation and from felsic schists in the Lawson Brook Formation yield U-Pb dates of 493 ± 2 Ma and 497 ±10 Ma, respectively. Based on these dates and constituent lithologies, the Annidale Group is tentatively correlated with parts of the Cookson Group to the southwest.   RESUME  La cartographie geologique et les datations U-Pb sur les zircons ont mene a la decouverte de roches volcaniques et sedimentaires distinctives, de l’Ordovicien interieur, dans la region d 'Annidale du sud du Nouveau-Brunswick. Ces roches sont comprises dans un Groupe nouvellement defini, nomme ici le Group d'Annidale, qui est divise en trois unites possiblement bordees par des failles et dont les âges se recouvrent partiellement. Ces unites sont nommees, du nord au sud: la Formation de East Scotch Settlement, la Formation du Ruisseau Lawson et la sequence de Can nan Forks. La Formation de East Scotch Settlement contient une succession a pendage abrupt de volcanites mafiques et felsiques et un assemblage varie de roches sedimentaires clastiques et volcanogenes. La Formation du Ruisseau Lawson consiste en une succession a pendage faible ou modere vers le nord dominee par les volcanites felsiques. La sequence de Cannan Forks, dont la majeure partie est une succession a pendage faible ou modere vers le nord, est dominee par les roches sedimentaires clastiques. Structuralement, une bonne partie du Groupe d'Annidale est caracterisee par un cisaillcment intense produit par de nombreuses failles verticales nord et nord-est et par des failles de chevauchement vers le sud et le nord. A proximite de ces failles, la Formation de East Scotch Settlement est caracterisee par une carbonatation intense qui est commundment accompagnee par une silicification porteuse de metaux de base et d'or et de zones d'alteration a mica chromifere.  Les zircons d'un dome felsique dans la Formation de East Scotch Settlement et de schistes felsiques dans la Formation du Ruisseau Lawson ont donne des âges U-Pb de 493 ± 2 Ma et 497 ± 10 Ma, respectivement. Sur la base de ces datations et de similarity lithologiques, le Groupe d'Annidale est tentativement corre1e avec des parties du Groupes de Cookson, situe au sud-ouest.  [Traduit par le journal]

atlantic geology

Geology and U-Pb geochronology of the Annidale Group, southern New Brunswick: Lower Ordovician volcanic and sedimentary rocks formed near the southeastern margin of lapetus Ocean