PRELIMINARY IN PHASE AND OUT OF PHASE AMS STUDY AND PALEOMAGNETISM OF ~870 MA MAFIC DIKES IN WEST AFRICA (GHANA)

ANTONIO, PAUL YVES JEAN; BARATOUX, LENKA; TRINDADE, RICARDO IVAN FERREIRA; ROUSSE, SONIA; MACOUIN, MÉLINA; FIRMIN, ANNE-SOPHIE; MARTINEZ DOPICO, CARMEN IRENE; PROIETTI, ARNAUD; AYITE, ANANI; ADU, EMMANUEL WILLIAMS KOBBY; AMPONSAH, PRINCE OFORI

LatinMag Letters

Universidad Nacional Autónoma de México

Año: 2019

2007-9656

Mid-Neoproterozoic is a period of transition between the supercontinent Rodinia and the amalgamation ofGondwana. An incomplete paleomagnetic database does not allow to constrain the precise paleogeographyof this transition. This study concerns the West African craton, which remains the least studied craton inpaleomagnetism. We propose a preliminary AMS study before showing the first paleomagnetic results obtainedon the Manso dike swarms (~867 Ma). For the first time, in-phase and out-of-phase susceptibilitywas used to study the anisotropy fabric of dikes. Few differences were observed between classical AMSand out-of-phase AMS and require further magnetic mineralogy study to understand the implications. It waspossible to isolate a characteristic direction during this pilot study on these dykes in order to obtain a newpaleomagnetic pole of reference for the West African craton.