Weathering and Carbon Sequestration at New York Wollastonite Mines

Kasten, Sadie; Inoa, Mateo; Keller, Dianne; Peck, William H.

doi:10.1130/abs/2022ne-374686

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“…Note that these calculations are for cemented samples only and are not representative of the unconsolidated material constituting the bulk of the two deposits. These rates are comparable to preliminary results from a 19.5 month rooftop weathering experiment using Lewis stockpile materials which yielded calcite production rates from pure wollastonite ranging from 0.33-0.72%/yr for a fine sand fraction, and from 0.03-0.29%/yr in the mediumcoarse sand fraction (Kasten et al, 2022).…”

Section: Evidence From Mineralogy and Texturessupporting

confidence: 85%

“…Here we show that microbially-mediated wollastonite dissolution and formation of opal and calcite from atmospheric CO 2 is well developed in these, and likely other wollastonite mines. For example, we also observe similar cemented mine wastes at the currently-operating Oak Hill mine 2.5 km east of Lewis, and the Valentine wollastonite mine in northwestern New York (Kasten et al, 2022). Our results give new insights on approaches for C sequestration and the value of using isotopes to enhance our understanding mineral weathering processes in natural systems.…”

Section: Introductionsupporting

confidence: 57%

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Passive carbon sequestration associated with wollastonite mining, Adirondack Mountains, New York

2023

msam

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Crushed ore in Adirondack wollastonite mines (New York) shows textural evidence for wollastonite dissolution and cementation by calcite and opal. The reaction CaSiO 3 + CO 2 = CaCO 3 + SiO 2 is a model reaction for silicate weathering and carbonation that has not been characterized in the field until now (outside of controlled experiments). Cemented samples from the Lewis and Fox Knoll mines contain up to 3% and 6% calcite respectively, and contain modern 14 C. Carbon isotope ratios have an organic signature at both mines but more strongly at Lewis (δ 13 C from -9‰ to -29‰ VPDB) which, along with observed filamentous biofilms, supports a microbial role in mineralization.Differences are seen between wollastonite weathering in these mines versus wollastonite weathering in lab experiments and field studies of carbonate formation in other rock types.Grains surrounded by reaction products reach complete dissolution here, indicating that This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Evidence From Mineralogy and Texturessupporting

confidence: 85%

Section: Introductionsupporting

confidence: 57%