A magmatic lull is a period of declined
magmatic activity in volcanically active regions. They may occur as a result of underthrusting of
hinterlandlithosphere 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]
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 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
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abcSchleiffarth, 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. 14 (5).
Geological Society of America: 1990–2008.
ISSN1553-040X.
^
abJohnson, 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).
ISBN9780813725130.