Formation of magnesium silicate hydrate cement in nature
Tillite lithified by magnesium silicate hydrate (M-S-H) cement has been formed at the surface of the Feragen Ultramafic Body in SE Norway. Serpentinization of olivine-rich rocks led to formation of brucite that dissolves during weathering to form a high pH (>9) Mg-rich fluid. This fluid disso...
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crescholarship:10.31223/osf.io/5aqnz 2024-04-07T07:56:07+00:00 Formation of magnesium silicate hydrate cement in nature de Ruiter, Lisa Austrheim, Håkon 2019 http://dx.doi.org/10.31223/osf.io/5aqnz unknown California Digital Library (CDL) http://opensource.org/licenses/AFL-3.0 posted-content 2019 crescholarship https://doi.org/10.31223/osf.io/5aqnz 2024-03-08T03:58:04Z Tillite lithified by magnesium silicate hydrate (M-S-H) cement has been formed at the surface of the Feragen Ultramafic Body in SE Norway. Serpentinization of olivine-rich rocks led to formation of brucite that dissolves during weathering to form a high pH (>9) Mg-rich fluid. This fluid dissolves quartz deposited by glaciers during the Weichselian glaciation. Subsequent evaporation leads to the precipitation of a nanocrystalline magnesium silicate hydrate phase with the approximate composition Mg8Si8O20(OH)8·6H2O. The resulting cemented rock is characterized by disintegrated and partly dissolved quartz grains that are surrounded by the M-S-H cement. This process occurs at surface conditions in a subarctic climate and is known to take place on the timescale of a few decades, as constrained by mining activities. Magnesium-based cement is currently of high interest as the search for environmentally friendly cement is a pressing task considering that the widely used Portland cement accounts for about 7% of the worldwide anthropogenic CO2 emission. As this study provides new key insights into the formation process of natural CO2-neutral magnesium-based cement on the field- and microscale, it could contribute in the development of a new sustainable construction material. Other/Unknown Material Subarctic eScholarship Repository (University of California) Norway |
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eScholarship Repository (University of California) |
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description |
Tillite lithified by magnesium silicate hydrate (M-S-H) cement has been formed at the surface of the Feragen Ultramafic Body in SE Norway. Serpentinization of olivine-rich rocks led to formation of brucite that dissolves during weathering to form a high pH (>9) Mg-rich fluid. This fluid dissolves quartz deposited by glaciers during the Weichselian glaciation. Subsequent evaporation leads to the precipitation of a nanocrystalline magnesium silicate hydrate phase with the approximate composition Mg8Si8O20(OH)8·6H2O. The resulting cemented rock is characterized by disintegrated and partly dissolved quartz grains that are surrounded by the M-S-H cement. This process occurs at surface conditions in a subarctic climate and is known to take place on the timescale of a few decades, as constrained by mining activities. Magnesium-based cement is currently of high interest as the search for environmentally friendly cement is a pressing task considering that the widely used Portland cement accounts for about 7% of the worldwide anthropogenic CO2 emission. As this study provides new key insights into the formation process of natural CO2-neutral magnesium-based cement on the field- and microscale, it could contribute in the development of a new sustainable construction material. |
format |
Other/Unknown Material |
author |
de Ruiter, Lisa Austrheim, Håkon |
spellingShingle |
de Ruiter, Lisa Austrheim, Håkon Formation of magnesium silicate hydrate cement in nature |
author_facet |
de Ruiter, Lisa Austrheim, Håkon |
author_sort |
de Ruiter, Lisa |
title |
Formation of magnesium silicate hydrate cement in nature |
title_short |
Formation of magnesium silicate hydrate cement in nature |
title_full |
Formation of magnesium silicate hydrate cement in nature |
title_fullStr |
Formation of magnesium silicate hydrate cement in nature |
title_full_unstemmed |
Formation of magnesium silicate hydrate cement in nature |
title_sort |
formation of magnesium silicate hydrate cement in nature |
publisher |
California Digital Library (CDL) |
publishDate |
2019 |
url |
http://dx.doi.org/10.31223/osf.io/5aqnz |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Subarctic |
genre_facet |
Subarctic |
op_rights |
http://opensource.org/licenses/AFL-3.0 |
op_doi |
https://doi.org/10.31223/osf.io/5aqnz |
_version_ |
1795673816000626688 |