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Itapororoca

Brésil

Les modélisations 3D en gravité à l'échelle semi-régionale peuvent mener à de nouvelles découvertes.

	Itapororoca is located in the northeast of Brazil The area is covered by tertiary sediments and alluvium. In 1975 an airborne magnetic survey detected a circular anomaly, suggestive of a volcanic intrusive.
	In order to explore the anomaly a Semi-regional gravity survey was conducted, revealing a negative gravity anomaly. Subtraction of the regional gravitational field revealed the residual field and negative 8mGAL anomaly coincident with a localized aeromagnetic anomaly and with hydrothermally altered outcrop.
	2.5 D modeling of the data along 4 profiles was used to estimate the volume of the deposit.
	The results of 3D modeling indicate that the intrusion extends to a depth of 8.5 km and has a total volume of 23 km³