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topographic variations in chaos on europa: implications for diapiric formationDisrupted terrain, or chaos, on Europa, might have formed through melting of a floating ice shell from a subsurface ocean [Cam et al., 1998; Greenberg et al., 19991, or breakup by diapirs rising from the warm lower portion of the ice shell [Head and Pappalardo, 1999; Collins et al., 20001. Each model makes specific and testable predictions for topographic expression within chaos and relative to surrounding terrains on local and regional scales. High-resolution stereo-controlled photoclinometric topography indicates that chaos topography, including the archetypal Conamara Chaos region, is uneven and commonly higher than surrounding plains by up to 250 m. Elevated and undulating topography is more consistent with diapiric uplift of deep material in a relatively thick ice shell, rather than melt-through and refreezing of regionally or globally thin ice by a subsurface ocean. Vertical and horizontal scales of topographic doming in Conamara Chaos are consistent with a total ice shell thickness >15 km. Contact between Europa's ocean and surface may most likely be indirectly via diapirism or convection.
Document ID
20060010996
Document Type
Reprint (Version printed in journal)
Authors
Schenk, Paul M.
(Lunar and Planetary Inst. Houston, TX, United States)
Pappalardo, Robert T.
(Colorado Univ. Boulder, CO, United States)
Date Acquired
August 23, 2013
Publication Date
August 28, 2004
Publication Information
Publication: Geophysical Research Letters
Volume: 31
Issue: 16
ISSN: 0094-8276
Subject Category
Geophysics
Report/Patent Number
Paper2004GL019978
Funding Number(s)
CONTRACT_GRANT: NCC5-679
Distribution Limits
Public
Copyright
Other