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- W2578722017 abstract "Opal-A, opal-CT and chalcedony develop in various geological environments mainly through continental weathering and hydrothermal processes. Although some spectroscopic criteria already differentiate the structural varieties of silica, no criterion distinguishes the formation process of opaline silica. The originality of this study is based on a unique collection of 38 hydrous silica samples of different structures formed in various geological contexts and lithologies. This large and diverse sampling of silica emphasizes that several new spectroscopic criteria distinguish opal-A, opal-CT and chalcedony: the apparent maximum of the absorption at 5200 cm −1 , the area of the absorption of silanol groups as well as the area ratio of the 5200 and 4500 cm −1 bands. Moreover, we observed that the shape of the molecular-water band, quantified by a new criterion developed here (concavity-ratio criterion, CRC), differentiates opals formed by weathering (CRC 0.82), regardless of their structure (−A or −CT). This new method quickly assesses the geological conditions of opal formation (on Earth or other terrestrial planets) for which data are unclear or missing." @default.
- W2578722017 created "2017-01-26" @default.
- W2578722017 creator A5005185031 @default.
- W2578722017 creator A5044839502 @default.
- W2578722017 creator A5083870151 @default.
- W2578722017 date "2017-07-12" @default.
- W2578722017 modified "2023-10-18" @default.
- W2578722017 title "Near infrared signature of opal and chalcedony as a proxy for their structure and formation conditions" @default.
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- W2578722017 doi "https://doi.org/10.1127/ejm/2017/0029-2614" @default.
- W2578722017 hasPublicationYear "2017" @default.
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