Yu, L;
Wu, K;
Liu, L;
Liu, N;
Ming, X;
Oelkers, EH;
(2020)
Dawsonite and ankerite formation in the LDX-1 structure, Yinggehai basin, South China sea: An analogy for carbon mineralization in subsurface sandstone aquifers.
Applied Geochemistry
, 120
, Article 104663. 10.1016/j.apgeochem.2020.104663.
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Abstract
The geochemistry and petrology of the LDX-1 structure of the Yinggehai basin, a natural analog of a sedimentary carbon storage site, was investigated to understand the consequences of the charging of CO2 gas in this system. The rocks in this structure are dominated by subarkose and sublitharenite sandstones. The authigenic minerals formed after CO2 injection are dawsonite, microcrystalline quartz, kaolinite and ankerite. Dawsonite and ankerite are formed just beneath a CO2 bearing anticlinal structure due to the reactions between silicate minerals (feldspars and clay minerals) and the fluid phase. Carbon and oxygen isotopic analyses indicate that the main carbon source for dawsonite and ankerite formation was mantle magmatic CO2. The aqueous activities of sodium and calcium, the partial pressure of CO2, pH and temperature are the key factors influencing the stability of the dawsonite and ankerite. The presence of the anticlinal structure, maintaining a locally high CO2 partial pressure in the waters beneath this structure, is likely responsible for the observed long-term persistence of dawsonite and ankerite in this system.
| Type: | Article |
|---|---|
| Title: | Dawsonite and ankerite formation in the LDX-1 structure, Yinggehai basin, South China sea: An analogy for carbon mineralization in subsurface sandstone aquifers |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.apgeochem.2020.104663 |
| Publisher version: | https://doi.org/10.1016/j.apgeochem.2020.104663 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Authigenic carbonate minerals, Carbon and oxygen isotopes, Dawsonite stability, Carbon capture and storage (CCS), Yinggehai basin |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10116269 |
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