The Grid: A serpentine pseudomorph after carbonate
Cross-polarized light photomicrograph of a thin section of a carbonated ultramafic rock from the Feragen Ultramafic Body (Norway), with grey serpentine surrounded by fine-grained carbonate.
The sample records a long and varied history of fluid-rock interaction: A peridotite reacted with water to serpentinite, which was then brecciated and cemented by calcium carbonate, possibly as part of the stockwork system beneath a hydrothermal field. Later, the calcium carbonate was dolomitised. Finally, dolomite crystals were replaced by serpentine pseudomorphs. A strong coupling of dolomite dissolution and serpentine precipitation allowed for the preservation of the carbonate twin planes.
Image width: 1.5 cm
Categories
Location
- Europe (3778)
- Northern Europe (905)
- Norway (159)
- Exact location (11.7998 E, 62.5741 N)
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Image properties
5093 × 3699 px;
image/jpeg; 22.2 MB
Camera:
Leica DFC320
Taken on 31
January
2018
Submitted on 15 February 2018
Licence
Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0)
Credit
Kristina G Dunkel (distributed via imaggeo.egu.eu)
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