Features of satellite altimetric gravity anomaly and its geology significance in Grenada area

This study area is located southeast of Caribbean Sea, an area of about 79,000 km². This paper, through collection of satellite altimetric gravity data produced by geophysical data corporation of University of Leeds, England, tries to process satellite altimetric gravity data by adopting regularization filter and vertical second derivative methods in this area, analyzes characteristics of the satellite altimetric gravity anomaly, discusses geological implications of gravity field. Combining with the regional geological research results of the predecessors, this paper determines the structural framework, and divides the tectonic units in this area. The results show that the characteristics of the satellite altimetric gravity anomaly are apparent, from the northwest to the southeast, the features of the gravity highs and the gravity lows alternating zonal distribution reflecting the framework of the uplifts and the depressions alternating zonal distribution in this area; the structures are complex in this area, and there developed many faults, and the discordogenic faults on both sides of the Margarita-Grenada arc controlled the regional tectonic evolution and the boundary of the tectonic units in this area; this area can be divided into four tectonic units, including Blanquilla arc, Grenada basin, Margarita-Grenada arc and Tobago basin, faulted contact between these tectonic units. These conclusions provide geophysical basis for renewable energy, such as geothermal research.