Pyroclastic breccia
Different forms of volcanic bombs exhibited in Strohn (Vulkaneifel). Top right: Angular-rounded litter slags , today assigned to the pyroclastic breccias
Pyroclastic breccias are a type of pyroclastic flow deposit .
Differentiation of the deposits
The individual pyroclasts within a pyroclastic flow deposit are divided into four categories according to their grain size;
- Ash (diameter of the grain <2 mm)
- Lapilli (2–64 mm)
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Bombs (> 64 mm, rounded shape)
- This category also distinguishes between bombs and breadcrust bombs whose surface has burst.
- Blocks (> 64 mm, unrounded shape)
Based on the amount of species contained in the deposit, pyroclasts, the total deposit can be classified.
definition
A pyroclastic breccia is a deposit that consists of more than 75 percent blocks.
Individual evidence
- ↑ Marc Szeglat: tephra and pyroclastic. Retrieved May 19, 2017 .
- ↑ Mineral Atlas - Fossil Atlas. Retrieved May 19, 2017 .