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Ancient organo-mineral geopolymer in South-American Monuments: Organic matter in andesite stone. SEM and petrographic evidence

Abstract : A recent study has shown the presence of artificial construction materials in pre-Columbian monuments at Pumapunku-Tiwanaku, Bolivia. In addition to ancient geopolymer sandstone-concrete megalithic slabs, the Pumapunku site contains puzzling ``H'' structures made of andesitic volcanic stone. The SEM study of this gray andesite shows the presence of organic matter: carbon, nitrogen, and minerals: Na, Mg, Al, Si, P, S, Cl, K, Ca. Organic matter is very unusual, if not impossible in a solid volcanic stone and suggests ceramic-like man-made stone. Our research demonstrates that these architectural components manufactured 1400 years ago (ca. CE 600) were fashioned with a type of organo-mineral precursor.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03633101
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Soumis le : mercredi 6 avril 2022 - 17:19:29
Dernière modification le : mercredi 31 août 2022 - 11:58:24

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Joseph Davidovits, Luis Huaman, Ralph Davidovits. Ancient organo-mineral geopolymer in South-American Monuments: Organic matter in andesite stone. SEM and petrographic evidence. Ceramics International, 2019, 45 (6), pp.7385-7389. ⟨10.1016/j.ceramint.2019.01.024⟩. ⟨hal-03633101⟩

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