Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 10, Pages 2044-2048Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50493
Keywords
Igneous diapirs; magma ascent; Altiplano-Puna; Uturuncu volcano; gravity inversion
Categories
Funding
- Natural Environmental Research Council [NE/G01843X/1]
- Royal Society University Research Fellowship
- ERC
- Spanish MICINN [AYA2010-17448]
- NERC [NE/G01843X/1] Funding Source: UKRI
- Natural Environment Research Council [NE/G01843X/1] Funding Source: researchfish
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The vertical transport of large volumes of silicic magma, which drives volcanic eruptions and the long-term compositional evolution of the continental crust, is a highly debated problem. In recent years, dyking has been favored as the main ascent mechanism, but the structural connection between a distributed configuration of melt-filled pores in the source region and shallow magma reservoirs remains unsolved. In the Central Andes, inversion of a new high-resolution Bouguer anomaly data over the Altiplano-Puna Magma Body (APMB) reveals similar to 15 km wide, vertically elongated, low-density, 3D structures rooted at the top of the APMB at 20 km depth. We integrate our gravity inversion with the available geophysical, geological, and petrological observations, and in agreement with petrological/mechanical considerations propose that, in this region of the Andes, partially molten granitic bodies ascend diapirically through the hot ductile mid-upper crust.
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