Geosite ID: M06
Name: Terra do Baptista
Thematic category: Stratigraphy and Lithology
Civil parish: Porto da Cruz
Location area: 0.1-10 ha
Location area(1):32°46'03.3'' N 16°50'32.7'' W
Altitude: 225 m
Distance to nearest paved road: 200 m
Conditions of observation: Satisfactory
(1) Coordinates of the geosite and / or the best viewpoint
Porto da Cruz’s granular mafic rocks, that outcrop inside the embedded Voltas and Massapez valleys, are a rare example of plutonic igneous rocks on Madeira Island. They are essentially gabbroic rocks (gabbros, monzogabbros and essexites) that contain as their main characteristic minerals such as feldspathóids, kaersutite and aegirine, suggesting a late residual alkaline emanation phase.
The existence of these lithologies confirms the fractional crystallization of small magmatic pockets in the internal and relatively shallow sectors of Madeira’s volcanic submarine edifice.
These rocks intrude the Porto da Cruz Formation, lower volcanic complex, and it is unknown if they are contemporaneous with it or if they are related with the eruptive phases of the Intermidiate Volvanic Complex.
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