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The origin of domes on Europa: The role of thermally induced compositional diapirism
Author(s) -
Pappalardo Robert T.,
Barr Amy C.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl019202
Subject(s) - diapir , geology , dome (geology) , buoyancy , eutectic system , geophysics , petrology , shell (structure) , thermal , tectonics , geomorphology , mechanics , materials science , seismology , thermodynamics , physics , alloy , composite material
The surface of Jupiter's moon Europa is peppered by topographic domes, interpreted as sites of intrusion and extrusion. Diapirism is consistent with dome morphology, but thermal buoyancy alone cannot produce sufficient driving pressures to create the observed dome elevations. Instead, diapirs may initiate by thermal convection that induces compositional segregation. Exclusion of impurities from warm upwellings allows sufficient buoyancy for icy plumes to create the observed surface topography, provided the ice shell has a small effective elastic thickness (∼0.2 to 0.5 km) and contains low‐eutectic‐point impurities at the few percent level. This model suggests that the ice shell may be depleted in impurities over time.