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Geologia
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ISBN10: 6630300432
ISBN13: 9786630300437
Publisher: Edicoes Nosso Conhecimento
Published: Jul 27 2026
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786630300437
Publisher: Edicoes Nosso Conhecimento
Published: Jul 27 2026
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: Portuguese
O maciço hercÃnico de Terni-Mazgout (Boudoufoud), situado na Meseta Oriental marroquina, é constituÃdo por uma série metassedimentar de xisto e arenito da era Visiana, intrudida por um corpo granitoide zonado (259 11 Ma) e afetada por uma alteração hidrotermal multifásica (sericitização, cloritização, muscovitização, greisenação). A mineralização apresenta-se sob a forma disseminada ou como preenchimento de fraturas, de acordo com três famÃlias distintas de veios: N30-N45 (ou - pirite - calcopirite - estibina em ganga quartzosa), N110-N120 (hematite) e N150-N160 (baritina - carbonatos - quartzo). Todo o socalho paleozoico é recoberto em discordância angular por uma série mesozoica, cujas argilas vermelhas do Triássico com intercalações basálticas dolerÃticas constituem uma fonte potencial de ferro para a camada de oxidação supergênica observada. Estas caracterÃsticas revelam um sistema magmático-hidrotermal multifásico, com sobreposições epitermais e supergénicas, num contexto estrutural de fracturação herdado da orogénese hercÃnica.
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