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Detailed geological mapping of the Goldenville and Halifax groups in metropolitan Halifax Regional Municipality, Nova Scotia, resulted in two-fold subdivision of both groups. The Goldenville Group was divided into the metasand-stone (feldspathic wacke)-dominated Taylors Head formation and the overlying, metasiltstone-dominated, Mn-rich Beaverbank formation. The Halifax Group was divided into the Cunard formation, dominated by sulphide-rich slate, and the overlying Bluestone formation, consisting of mainly metasiltstone and metasandstone. Lithogeochemical and petrological studies resulted in the characterization of the Beaverbank, Cunard, and Bluestone formations as potential acid-producing units with pyrrhotite as the main iron-sulphide mineral. The presence of acid rock drainage (ARD) is governed by bulk-rock chemical composition and mineral assemblage. To test the predictability of ARD production, a portable XRF instrument was used to obtain relatively inexpensive whole-rock and sulphur data that were used in conjunction with conventional XRF analyses and acid-base accounting tests. Results from the three methods compare favourably. Use of the portable XRF instrument facilitates a timely and cost-eective approach to predicting ARD but does not replace the legally mandated acid-base accounting procedure.  RESUME  Une cartographie geologique detaillee des groupes de Goldenville et de Halifax dans la municipalite regionale de Halifax, en Nouvelle-Ecosse, a donne lieu a deux divisions de ces deux groupes. Pour ce qui est du groupe de Gold-enville, les deux formations suivantes ont ete etablies: la Formation de Taylors Head, composee principalement de metagres (wacke feldspathique) et la Formation de Beaverbank sus‑jacente, composee principalement de metasiltite riche en Mn. En ce qui concerne le groupe de Halifax, les deux formations que voici ont ete identifiees: la Formation de Cunard, composee principalement d’ardoise riche en sulfures, et la Formation de Bluestone sus‑jacente, composee surtout de metasiltite et de metagres. Les etudes lithogeochimiques et petrologiques ont permis d’etablir que les Formations de Beaverbank, de Cunard et de Bluestone etaient susceptibles d’agir comme precurseurs acides, la pyrrhotite etant le principal mineral a sulfure de fer present. La presence d’un drainage rocheux acide (DRA) est regie par la composition chimique de la roche brute et l’association minerale. Pour verifier la possibilite d’un DRA, de concert avec des analyses traditionnelles a fluorescence X et de bilan acide-base, un appareil portatif a fluorescence X a ete utilise pour recueillir de maniere relativement economique des donnees sur la roche brute et les sulfures. Les resultats obtenus par les trois methodes se comparent bien. L’utilisation d’un appareil a fluorescence X portatif permet de predire de maniere economique et rapidement la possibilite du DRA, mais cette technique ne saurait se substituer a l’analyse du bilan acide-base prevue par la reglementation.

atlantic geology

Lithogeochemistry, petrology, and the acid-generating potential of the Goldenville and Halifax groups and associated granitoid rocks in the metropolitan Halifax Regional Municipality, Nova Scotia, Canada