Palagonitization of deep sea dredge sample glasses
Abstract
Two compositionally distinct types of surface layers partially replace glasses dredged from the deep sea: 1) high-Fe, low-Si (FeO 27-33 wt.%, SiO 2 10-23 wt.%); and 2) low-Fe, high-Si (FeO 9-26 wt.%, SiO 2 23-55 wt.%). High-Fe palagonite may have formed by alteration of glass in the vicinity of deep sea metalliferous hydrothermal systems. Some degree of crystallinity in the high-Fe palagonites is revealed by analytical electron microscopy (AEM). Poorly crystalline initial precipitates apparently recrystallize to smectite fibers where the layer has continued exposure to the solution (e.g., along open channels within the rind). AEM and EMPA reveal compostional and microstructural heterogeneity in the altered layers.
Fields of Study & Subjects
Methane Hydrates and Related Phenomena
Publication details
- Journal / source
- Water-Rock Interaction (WRI-6)
- Publisher
- CRC Press
- Volume
- 6
- Pages
- 337–340
- Publication date
- 20 February 2026
- Language
- EN
- Document type
- Book chapter