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Il fuoco della Terra:dal nucleo alla superficie
Dipartimento di Scienze della Terra
Università degli Studi di Milano
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Agricola, De re metallica, 1556
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Thomas Burnet 1681
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Athanasius Kircher, Mundus Subterraneus, 1665
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Gardner, 1913Halley, XVII secoloSymmes XIX secolo
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Emil Wiechert 1861-1928
il “Samoa-core”
Beno Gutenberg1889-1960
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5150-6370 km
2890-5150 km
40-2890 km
0-40 km
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La pressione nella nostra vita...
100 metri – 10 bar
2 bar
fino a 50 bar
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3.638.500 bar nel nucleo terrestre (1 GPa = 10.000 bar)
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Le rocce fluiscono nel tempo geologico
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Hellenic Kurile Izu-Bonin
Sunda Tonga Central America
Tomografie sismiche: immagini dall’interno della Terra
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il diamante Cullinan: 3106 carati
Hazen 1999
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Il diamante, i vulcani kimberlitici ed il mantello terrestre
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I granati diamantiferi di Bardane (Norvegia)
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Carbonio e carbonio: l’effetto della pressione (10 GPa = 100000 bar – circa 300 km)
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1922
Il frigorifero a gas !!!
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Baltzar von Platen, Erik Lundblad, il progetto QUINTUS ad ASEA (Svezia)
e la grande sfida per la sintesi del diamante
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dal frigorifero a gas …
… all’incudine sferica
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16 Febbraio 1953
50000 bar,“fuoco” di thermite
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“DIAMOND MAKERS” General Electric, 1955
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16 Dicembre 1954
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La multi-incudine “split-sphere”
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29 mm
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prima … … dopo
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La multi-incudine “Walker” a Milano
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Verso il nucleo …la cella a diamante
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IL CICLO DELL’ACQUA E IL CICLO DELLE ROCCE
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M. St. Helens, Cascades, USA, maggio 1980
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GRAZIE !