The Hanna Farm pluton is a complex granite -gabbro pluton which appears to be truncated by the Kirkhill fault zone, probably by predominantly dip-slip motion. A leucogranite has been intruded into the Kirkhill fault zone at the southern end of the Hanna Farm pluton. The main Hanna Farm pluton contains secondary biotite and other evidence of hydrothermal alteration, and is petrographically and geochemically similar to a series of Early Carboniferous (ca. 345 Ma) granites in the western Cobequid Highlands. Secondary biotite within country rock has been radiometrically dated at 303±11 Ma. The leucogranite within the Kirkhill fault zone lacks evidence of hydrothermal alteration. It shows local ductile deformation, but is not noticeably offset by the Kirkhill fault zone.The Kirkhill fault zone is one of the major east-west trending fault zones in the western Cobequid Highlands. It cuts and mylonitises late Hadrynian sedimentary and plutonic rocks, and probable Early Carboniferous plutons. The Hanna Farm pluton appears to post-date the last major phase of strike-slip motion on the Kirkhill fault.Le Pluton de Hanna Farm est un bati complexe de granite et gabbro que semble recouper la zone de failles de Kirkhill, probablement sous l'effet d 'un movement a forte composante selon le rejet-pente. Un leucogranite s'est mis en place au sein de la zone de failles de Kirkhill aux confins meridionaux du Pluton de Hanna Farm. Le pluton principal de Hanna Farm contient une biotite secondaire ainsi que d 'autres preuves d 'une alteration hydrothermale. II ressemble, par sa petrographie et son geochimisme, a une serie de granites eocarbonifcres (environ 345 Ma) de l'ouest des Monts Cobequid. Une datation radiom^triquedelabiotite secondaire querenferm el'encaissant, lasitue a303±l 1 Ma. On ne rencontre aucune trace d 'alteration hydrothermale dans le leucogranite sis au sein de la zone de failles de Kirkhill. Celui-ci presente une deformation ductile locale mais n 'est pas d&ale de fafon notable par la zone de failles de Kirkhill.Cette demiere est 1 'une des principales zones de failles a tendance Est-Ouest dans 1 'ouest des Monts Cobequid. Elle recoupe et mylonitise des roches plutoniques et sedimentaires tardihadryniennes ainsi que des plutons probablement eocarboniferes. Le Pluton de Hanna Farm semble postdater le dernier episode majeur de decrochement sur la faille de Kirkhill.[Traduit par le journal]
The Early C arboniferous Pleasant Hills and Hart Lake -Byers Lake granitoid plutons are the youngest plutons in the eastern Cobequid Highlands. In both plutons, coarse-grained granites predominate, but both also include fine-grained phases, most common at their margins. Modally, these granites fall in the "alkali-feldspar granite" field o f the IUGS classification.
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