Loading Events

« All Events

  • This event has passed.

October 25 @ 4:00 pm - 5:00 pm CDT

Current Research in EEPS Seminar: Mathieu Lapotre – Harvard University

Abstract Title:

Paleoenvironmental constraints from quantitative sedimentology and geomorphology: Canyon erosion and sand-ripple formation on Mars

Abstract:

The geologic records of terrestrial planets in our Solar System attest to the volatility of habitability. The history of Mars, in particular, is one of dramatic change that transformed a hospitable environment into the barren land we know today. Deciphering Mars’ geologic past using data from orbiting and landed spacecraft requires using and adapting theory and techniques that were developed for Earth. In return, Mars offers a unique test for Earth-based theory under alien boundary conditions. In this presentation, I will demonstrate how a mechanistic understanding of surface processes sheds light onto Martian paleohydrology and paleoclimate through two examples: the erosion of bedrock canyons by water, and the formation of sand ripples by winds. I will first question the classic assumption that Martian bedrock canyons formed from groundwater-seepage erosion, and show that surface water flows carved those canyons instead. Second, I will present a unifying theory for sand-ripple formation across fluids that can explain the ubiquity of anomalously large eolian ripples on modern Mars and help constrain atmospheric conditions on ancient Mars. Altogether, our results have surprising implications for our understanding of terrestrial landscapes and Mars’ potential as a refugium for early life in the Solar System.

 

 

 

 

 


Details

Date:
October 25
Time:
4:00 pm - 5:00 pm
Event Category:

Details

Date:
October 25
Time:
4:00 pm - 5:00 pm
Event Category:

For outside visitors, the best way to get to our department is to come in on Rice Blvd and turn into entrance 20 (intersection of Rice and Kent St.). At the stop sign, you will see a visitor parking lot.  From there, walk east to the department.  The google map below shows exactly where our building is.