Magma crack9/22/2023 ![]() ![]() We then test the stability of chambers that grow through dike lensing, by dynamically simulating the thermal evolution of basaltic composition magma chambers in country rock composed of either tonalite or amphibolite, as end member proxies for arc and continental crustal magma chambers. We develop a model for the focusing or 'lensing' of rising dikes by magma chambers, and show that it dominates focusing by volcanic edifices in most cases. ![]() We suggest that this organization occurs via mechanical interactions between the magma chamber, volcanic edifice and dikes, and that the stresses generated by these features may localize crustal magma transport before the first eruption occurs. The development of discrete volcanic centers reflects a focusing of magma ascending from the source region to the surface. ![]()
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