f Regional Gravity and Aeromagnetic Investigation of the Takutu Basin, Roraima - Brazil

A regional gravity study has been undertaken over the Takutu Basin, in Roraima-Brazil, sponsored by the ABGP (Anglo Brazilian Gravity Project) with logistical assistance provided by the University of Leeds, Earth Sciences Department, the ON (Observatório Nacional do Rio de Janeiro-Brazil) and the CPRM (Companhia de Pesquisa de Recursos Minerais-Brazil). The gravity survey carried out in this region helps to delineate tectonic provinces and to define the boundaries of the Mesozoic Takutu rift basin. The only existing gravity data available, prior to this work, was part of a country-wide data acquisition project from the city of Manaus along the road to the Venezuelan border, forming a long N-S profile. A new set of 291 gravity measurements, with 3km spacing was established using a Lacoste & Romberg gravity meter.