Zingg Diagram

Zingg diagram is used for the classification of clastic sediment grain shapes (pebbles) based on three orthogonal axes : long (a), intermediate (b), and short (c).

Method :

Grain shape is defined by the ratios –

• b/a (intermediate / long axes)
• c/b (short / intermediate)

Shape Classes

1. Equant (Spheroidal) : nearly equal axes
2. Discoidal (Disc-shaped) : thin but wide
3. Bladed : flat and elongated
4. Rod-shaped : long and narrow

Uses :

• It determines transport and depositional history of clasts (eg. fluvial, glacial, beach environments etc.)
• A zingg diagram plots these ratios on an X-Y plot to visually classify particles.