Abstract
The Triunfo batholith, located in the Transverse Zone of Borborema Province in northeastern Brazil, consists of ultrapotassic alkali-feldspar syenite containing comagmatic alkali pyroxenite inclusions, and cut by synplutonic alkali pyroxenite dikes. Field, chemical, mineralogical and isotopic studies on rocks of this batholith have led to the hypothesis that coexisting syenite and pyroxenite melts were produced by large-scale liquid immiscibility from a parent mafic syenitic magma. A model for the spatial distribution of the unmixed syenitic and pyroxenitic melts proposed that volumetrically subordinate but denser pyroxenite underlies the main syenite body. In this study, three gravity traverses along the major and minor axes of the batholith were carried out. The spatial distribution hypothesis was tested using direct and inverse gravity modeling, which suggested that a 200 m thick pyroxenite layer with a total width of 8.5 km forms the base of the batholith whose geometric form is intermediate between that of a laccolith and a lopolith.
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