A magmatic lull is a period of declined magmatic activity in volcanically active regions. They may occur as a result of underthrusting of hinterland lithosphere beneath a volcanic arc, changes in subduction parameters such as relative velocity, direction and slab dip (e.g. 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]

A volcanic gap is a magmatic lull that separates two distinct volcanic zones. For example, the Andean Volcanic Belt of South America has three major volcanic gaps: the Peruvian flat-slab segment (3 °S–15 °S), the Pampean flat-slab segment (27 °S–33 °S) and the Patagonian Volcanic Gap (46 °S–49 °S).[3]

References

  1. 1 2 3 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. Geological Society of America. 14 (5): 1990–2008. ISSN 1553-040X.
  2. 1 2 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. pp. 377–398. doi:10.1130/2015.2513(10). ISBN 9780813725130.
  3. ↑ Stern, Charles R. "Active Andean volcanism: its geologic and tectonic setting". Revista Geológica de Chile. National Geology and Mining Service. 31 (2): 161–206. ISSN 0716-0208.


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