Discrete simulations of density-driven volcanic deformation: Applications to Martian caldera complexes | Posted on:2011-12-18 | Degree:M.S | Type:Thesis | University:Rice University | Candidate:Zivney, Lindsay Laurel | Full Text:PDF | GTID:2440390002466091 | Subject:Geology | Abstract/Summary: | | We have carried out 2-D numerical simulations using the discrete element method (DEM) to investigate density-driven deformation in Martian volcanic edifices and how it affects the development of caldera complexes. These simulations demonstrate that the presence of a dense and weak cumulate body within a volcanic edifice strongly influences the volcano morphology and enhances volcanic spreading. The settling of a cumulate body generates distinctive structural and morphological features characteristic of Olympus Mons and Arsia Mons, including low flank slopes and pronounced summit calderas. We show that gravitational spreading of a cumulate body can play a primary role in the long-term development of calderas. We conclude that a cumulate body that is both shallow and wide could generate a single large depression similar to the Arsia-type caldera, while our simulations of a narrow cumulate body are capable of generating summit subsidence that is similar in dimension to the Olympus Mons caldera. | Keywords/Search Tags: | Simulations, Volcanic, Caldera, Cumulate body | | Related items |
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