# Magmatic lull

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A **magmatic lull** is a period of declined [magmatic](/source/Magma) activity in volcanically active regions. They may occur as a result of underthrusting of [hinterland](/source/Hinterland) [lithosphere](/source/Lithosphere) beneath a [volcanic arc](/source/Volcanic_arc), changes in [subduction](/source/Subduction) parameters such as relative velocity, direction and [slab](/source/Slab_(geology)) dip (e.g. [flat slab subduction](/source/Flat_slab_subduction)),[1] arc-arc collisions[2] and subduction hinge advance.[1] Individual magmatic lulls may last tens of millions of years between periods of volcanicity.[1][2]

Magmatic lulls can be related to **volcanic gaps**, which are regions lacking volcanic activity that separate two distinct volcanic zones. For example, the [Andean Volcanic Belt](/source/Andean_Volcanic_Belt) of [South America](/source/South_America) has three major volcanic gaps: the Peruvian flat-slab segment (3 °S–15 °S), the [Pampean flat-slab](/source/Pampean_flat-slab) segment (27 °S–33 °S) and the Patagonian Volcanic Gap (46 °S–49 °S).[3]

## References

1. Schleiffarth, W.K.; Darin, M.H.; Reid, M.R.; Umhoefer, P.J. (2018). "Dynamics of episodic Late Cretaceous–Cenozoic magmatism across Central to Eastern Anatolia: New insights from an extensive geochronology compilation". *[Geosphere](/source/Geosphere_(journal))*. **14** (5): 1990–2008. [Geological Society of America](/source/Geological_Society_of_America). [ISSN 1553-040X](https://www.worldcat.org/issn/1553-040X)

1. Johnson, Kenneth H.; Schwartz, J.J.; Žák, Jiří; Verner, Krystof; Barnes, Calvin G.; Walton, Clay; Wooden, Joseph L.; Wright, James E.; Kistler, Ronald W. (2015). "Composite Sunrise Butte pluton: Insights into Jurassic–Cretaceous collisional tectonics and magmatism in the Blue Mountains Province, northeastern Oregon". *Late Jurassic Margin of Laurasia: A Record of Faulting Accommodating Plate Rotation*. Vol. 513. [Geological Society of America](/source/Geological_Society_of_America). pp. 377–398. [doi:10.1130/2015.2513(10)](https://doi.org/10.1130/2015.2513(10)). ISBN 9780813725130.

1. Stern, Charles R. (2004). ["Active Andean volcanism: its geologic and tectonic setting"](https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082004000200001&lng=es&nrm=iso). *[Revista Geológica de Chile](/source/Revista_Geol%C3%B3gica_de_Chile)*. **31** (2): 161–206. [National Geology and Mining Service](/source/National_Geology_and_Mining_Service). [ISSN 0716-0208](https://www.worldcat.org/issn/0716-0208)

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