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Terrain types and local-scale stratigraphy of grooved terrain on ganymedeGrooved terrain is subdivided on the basis of pervasive morphology into: (1) groove lanes - elongate parallel groove bands, (2) grooved polygons - polygonal domains of parallel grooves, (3) reticulate terrain - polygonal domains of orthogonal grooves, and (4) complex grooved terrain - polygons with several complexly cross-cutting groove sets. Detailed geologic mapping of select areas, employing previously established conventions for determining relative age relations, reveals a general three-stage sequence of grooved terrain emplacement: first, dissection of the lithosphere by throughgoing grooves, and pervasive deformation of intervening blocks; second, extensive flooding and continued deformation of the intervening blocks; third, repeated superposition of groove lanes concentrated at sites of initial throughgoing grooves. This sequence is corroborated by crater-density measurements. Dominant orientations of groove sets are parallel to relict zones of weakness that probably were reactivated during grooved terrain formation. Groove lane morphology and development consistent with that predicted for passive rifts suggests a major role of global expansion in grooved terrain formation.
Document ID
19870038394
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Murchie, Scott L.
(Brown Univ. Providence, RI, United States)
Head, James W.
(Brown Univ. Providence, RI, United States)
Helfenstein, Paul
(Brown University Providence, RI, United States)
Plescia, Jeffrey B.
(USGS Flagstaff, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
November 30, 1986
Publication Information
Publication: Journal of Geophysical Research
Volume: 91
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
87A25668
Funding Number(s)
CONTRACT_GRANT: NAGW-137
Distribution Limits
Public
Copyright
Other

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