ELEMENTS: Arc Magmatic Tempos
April 06, 2015
The April issue of Elements magazine (volume 11, issue 2) went to press March 27 and is scheduled to be mailed April 13. In this issue, the characteristics, potential causes, and implications of episodic magmatism in oceanic and continental arcs are explored. A comparison of U–Pb bedrock and detrital zircon ages in arcs with independent calculations of volumetric magma addition rates (MARs) indicates that 100–1000 times more magmatism is added to arcs during flare-ups than during lulls. Episodic arc magmatism may result from external forcing on arc systems caused by events outside the arc and/or from internal cyclic processes driven by feedback between linked tectonic and magmatic processes within the arc. Changes and asymmetries in magmatic, tectonic, and geochemical histories provide important constraints for evaluating these poorly understood driving mechanisms. [Paterson and Ducea (2015)Elements 11: 91-98].
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