Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p43a1383p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P43A-1383
Mathematics
Logic
5480 Volcanism (6063, 8148, 8450), 8140 Ophiolites (3042), 8450 Planetary Volcanism (5480, 6063, 8148), 8485 Remote Sensing Of Volcanoes
Scientific paper
Hundreds of narrow, linear ridges interpreted as dike segments and dike swarms are found in the transition zone between Elysium Rise and Utopia basin. The dikes are both modifying and constraining Early Amazonian flows suggesting intense dike emplacement in the transition zone between Utopia Basin and Elysium Rise in the Early Amazonian. Morphology of linear ridges Single ridges CTX images reveal that single ridges generally have a sharply defined crest, are up to 30 km long, 200 m- 400 m wide and, according to single MOLA tracks, have a height varying between 5 to 30m. One of the observed single ridges is emplaced en echelon and another single ridge system penetrates a lobate flow unit and continues as a ridge on the other side. One singular sharp-crested ridge is also associated with a rough textured mound with a central ridge, which has been interpreted to be a möberg ridge. Mutiple Ridges Five occurrences of multiple ridge systems were observed within the study area. These usually have a wedge-like shape, are 15-45 km long and 1-7 km wide being broadest in the middle of the transect. In the westernmost part of the study area HiRISE images reveal that some of the multiple ridge systems have a distinct, symmetric fracture indicating that the ridge material is competent. Moreover short stubby flows originate from some of the ridges. Origin of the linear ridges The ridges are most likely to be either dikes or möberg ridges because they are very uniform, linear, crosscutting different units and sometimes being emplaced en echelon . The observed fractures along the crest of the ridges are not observed in hyaloclastite ridges on Earth, which probably indicates that the material is not loose hyaloclastite. This support the conclusion that the observed ridges either are normal dikes or that they are dikes emplaced subglacially as part of an effusive eruption. Geologic relationships and preservation Some ridges clearly crosscut flows that are mapped as Early Amazonian while others have constrained Early Amazonian outflow activity suggesting intense dike emplacement in the Early Amazonian. Some of the observed ridges are also crosscutting a rough textured knobby unit, which displays small elongated ridges, which are interpreted to be yardangs. Moreover different stages of inverted craters are observed within this unit. This indicates that erosion of geologic units has taken place in the area making it plausible that normal dikes have been exposed. Conclusions and implications The observed linear ridges are interpreted to be single dikes and dike swarms,- either emplaced as normal dikes or as subglacially in association with an effusive eruption. The finding of yardangs and different stages of inverted craters indicate that erosion of units has taken place in the area making it feasible that normal dikes have been exposed. However, evidence for möberg ridges has been reported within the area making subglacial intrusions also plausible.
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Head James
Pedersen G. B.
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