Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Accretionary Lapilli

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_7

Accretionary lapilli are pyroclastics. During volcanic eruptions, some of the small volcanic ash and water vaper condense to form spherical or pisolitic accretionary bodies called accretionary lapilli, pisolites or volcanic ash balls. These bodies are common in volcaniclastic rocks. Accretionary lapilli are also found in the base surge tuff in the Beihai Weizhoudao National Geopark, which formed during a phreatomagmatic eruption.

Accretionary lapilli are spherical, bean-shaped features that form by the accretion of minute volcanic ash in the presence of steam or water vapour during volcanic eruptions. They are also called pea stones or volcanic ash spheres. They are common in the pyroclastic rocks in the volcanic regions of eastern China (Fig. 4).
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