Mathematics – Logic
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.h33c1403w&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #H33C-1403
Mathematics
Logic
1824 Geomorphology: General (1625), 5415 Erosion And Weathering, 5416 Glaciation, 5470 Surface Materials And Properties
Scientific paper
High-resolution images have revealed a myriad of intriguing landforms banked along the northern edge of Terby Crater (D=164km), a Noachian-aged crater located on the northern rim of Hellas (~28°S, 287°W). Landforms within this crater include north-trending troughs and ridges, a 2km-thick sequence of exposed layers, mantled ramps that extend across and between layered sequences, sinuous channels, collapse pits, fan-like structures and viscous flow features. The suite of diverse landforms attest to a diversity of rock types and geologic processes, making this locality ideal for studying landform-climate relationships on Mars. The 2km-thick layered sequences in Terby are primarily exposed in two ridges that extend from the northern rim to roughly the center of the crater. The entire sequence of layers is inferred to be fine-grained based on their cliff-forming nature and thermal signature. Yardangs are not observed but gentle scalloping of the eroding layers and faults are common. The sequence has three apparent units that are separated by angular or stratigraphic unconformities at the northern edge of the crater. The basal and upper sequences contain sub-horizontal, laterally continuous layers that dip roughly ~20° to the south and are regularly interbedded with somewhat massive, alternating light- and intermediate-toned layers. There are at least two fairly continuous, dark, knobby and relatively resistant layers near the top of the stratigraphic sequence that may be volcanic in origin. The unique, light-toned middle unit is massive or poorly bedded and exhibits possible deformation structures. The transition in the stratigraphic sequence likely represents a change in depositional environments, perhaps as a response to climate or to ancient ice or lake levels in Hellas. The OMEGA visible-near infrared hyperspectral imager has detected hydrated minerals (clay?) within the sequence of layers which were recently interpreted to be dendritic sediments deposited in an alluvial fan or delta prograding towards the south. There is no evidence, however, for a channel system north of Terby and the geometry of the layers do not support this hypothesis. We propose the layers are more indicative of a volcanic and/or aeolian origin. The hydrated mineral signature may be related to ice- or water-rich material that was reworked into the layered deposit from the Hellas interior.
Howard Alan D.
Wilson Andrew S.
No associations
LandOfFree
The Geomorphic and Stratigraphic Analysis of Layered Deposits in Terby Crater on Mars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Geomorphic and Stratigraphic Analysis of Layered Deposits in Terby Crater on Mars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Geomorphic and Stratigraphic Analysis of Layered Deposits in Terby Crater on Mars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-747486