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Serra de Dentro, Porto Santo, Porto Santo Island, Madeira, Portugali
Regional Level Types
Serra de Dentro- not defined -
Porto SantoMunicipality
Porto Santo IslandIsland
MadeiraAutonomous Region
PortugalCountry

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Latitude & Longitude (WGS84):
33° 4' 51'' North , 16° 18' 33'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Camacha465 (2018)3.2km
Caniçal3,893 (2011)55.3km
Machico12,567 (2017)58.9km
Água de Pena2,434 (2017)60.8km
Santa Cruz6,010 (2018)62.9km
Mindat Locality ID:
265113
Long-form identifier:
mindat:1:2:265113:5
GUID (UUID V4):
0
Name(s) in local language(s):
Serra de Dentro, Porto Santo, Ilha de Porto Santo, Madeira, Portugal


Bentonite occurrence.



Os extensos e possantes depósitos de argilas de tonalidade esverdeada que aqui afloram são designados localmente de salão ou massapez.
Estas argilas esmectíticas resultaram da alteração de materiais vulcaniclásticos submarinos, os hialoclastitos, formados durante a fase de montanha submarina. Por processos de meteorização, a alteração ocorreu, primeiro, sob a influência da água do mar, continuando mais tarde, em condições subaéreas.
Os depósitos encontram-se cortados e atravessados por uma importante rede de rochas filonianas escuras, de natureza basáltica, que servem de suporte e de preservação dos depósitos, relativamente à erosão. É evidente a presença de auréola de metamorfismo na zona de contacto entre os filões e os depósitos de argila.
Estruturas sedimentares como as fendas de dessecação ou fendas de retração, formadas por contração devido à evaporação, indicam a presença de materiais com componentes argilosos ou siltosos.
Este é um local de relevância tanto regional como nacional, dada a génese, natureza e composição química destes depósitos argilosos, únicos em Portugal.
O salão faz parte da arquitetura popular do Porto Santo porque foi utilizado durante décadas na cobertura das típicas “casas de salão”, antes da introdução da telha cerâmica.
Ref.: http://geodiversidade.madeira.gov.pt/index.php/geossitios/porto-santo/44-serra-de-dentro

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African PlateTectonic Plate

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