EMPLACEMENT LEVELS OF DEVONIAN I-TYPE GRANITOIDS OF THE PISCATAQUIS MAGMATIC BELT, CENTRAL AND WESTERN MAINE
This study aims to examine the emplacement level of plutons in the PMB utilizing the Al in hornblende geobarometer. This necessitates that the granites have a metaluminous I-type mineralogy, that is coexisting hornblende + bitoite + sphene. The plutons examined in this study are – the Songo granodiorite, the North Lexington granite, the Chain of Ponds pluton and the metaluminous phases of the Mooselookmeguntic and Rome – Norridgewock plutons. These plutons not only represent a range of pluton ages but are located along traverses, which are both orogen parallel (NE – SW) and perpendicular to this (NW – SE). Although this selection of plutons is restricted compositionally to the metaluminous granites it may be possible to infer information regarding emplacement depths of related peraluminous rocks of the PMB. Therefore, understanding the emplacement levels of the plutons of this suite across central Maine will further elucidate the assembly of the continental crust during the Acadian orogeny.