1. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure Akos Kereszturi, PHD Collegium Budapest Eotvos Lorand University of Sciences Hungarian Astronomical Association e-mail: kru@mcse.hu

2. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Contents Methods to analyze role of water on Mars My research on fluvial systems Proposed system for water-related environment reconstruction: possibility for synthesis between surface morphology and meteoritic studies

3. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Targets to analyze the presence/role of water on Mars: Surface mineralogy (orbital spectroscopy): phyllosilicates sulphates hematite… Surface morphology (orbital images and topographyc data): channels lakes, deltas melted and collapsed terrains gullies Subsurface mineralogy (Maritan meteorites): H 2 O content during magma crystallization later alterations

4. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Research on ancient fluvial systems (channels and valleys) Aims: get information on source of water quantity of water duration of wet period style of erosion implication to the paleoenvironment

5. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Possible errors: manual pointing accuracy different coordinate systems trigonometric computations locations of MOLA tracks errors: linear distances<10% topography<20% aim: statistical analysis Working methods Data: images: VO, MGS, MEX topography: MGS PEDR, MEX DTM mapped databases: MDIM, MEGDR reference: IAU2000 areoid

6. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Results: Correlations were analyzed (and several times found) between: width and depth slope shape and other parameters shape of longitudinal profiles meanders and paleodischarge values eroded and accumulated volume of material locations of sedimentary plains

7. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Results: 5 groups of channels with morphological, morphometrical differences with probably different water sources and duration of activity partly mentioned in literature, but few numerical values before

8. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi These groups may have formed under different environments types. Some preliminary results: source of water: 1. areal, 2.-5. local relative duration of activity: longitudinal profile shape scatter between slope parameters volume of sediments + paleodischarge values

9. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Where is it interesting for scientists working on meteoritics? problems with the reconstruction of water-related changes/weathering on Mars small data mostly for individual targets (few valley data detailed enough, few Martian meteorites in hand) source of data is scattered in space (from different locations) and time (from different periods of the Martian evolution) Possible solution: connect different type of data water related surface morphology + meteorite mineralogy for rough caracterisation of wet environment types (p, T, duration etc.)

10. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi First aims: Eliminate the environment type from numerical parameters Classify the environment types Example: duration temperature of liquid phase

11. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi Aim: Morphology (surface water) + Mineralogy (subsurface water) How can these be fused? Nobody knows yet… Cooperation and ideas are welcomed!

12. Distribution and occurrence of liquid water on Mars from the analysis of valley network structure. NIPR Conference 2007.06.06. Tokyo, Akos Kereszturi