The end of the sledge (but not the end of the story)…

Geoff Evatt | 08 Jan 2020

Hello from Outer Recovery, where with mixed emotions we bid farewell to our subsurface meteorite detector systems…. yep, today I had the honour of towing the single panel sledge system to the 0.75km2 area searched mark. Shortly after it errored out, a little way from where the 3 panel system finished two days earlier. We’re actually rather proud of the system, after all it did work amazingly well whilst it was working. It was the repairs between operational bouts which was the pain and has taken up our time, effort and energies.  However the undulating ice surface (see pics) took its toll: the accelerometers in the system constantly registering over 10g’s of acceleration!  In all previous testing locations (including last year’s testing on Antarctic blue ice at Sky-Blu) the system experienced always less than 6g’s, and even those were relatively rare occurrences. This constant battering from the ice meant that anything which could fail did, and once repaired as best we could, a weakness in components remained for further exploitation. Yet, the modular system of the detector had the advantage that we could continue in a fashion, and did so for 18 odd days.

Wouter in the expanse of Antarctica. [Credit: Geoff Evatt]

Fittingly, as I drove the sledge back to camp, I noticed a black dot on the ice. Yep, number 65 for the area this year. A lovely single stone, which even the sledge had a good view of. And best of all, this takes us to 101 samples for the Lost Meteorites project! It thus looks like we have almost certainly collected over 100 meteorites for return to the UK, all ready to be examined for their scientific worth and hopefully put on public display.

A small meteorite next to the now ex-sledge detector system. [Credit: Geoff Evatt]

So, did we find the layer of lost meteorites? No, the layer of lost meteorites hasn’t been found by the metal detection system, but we do seem to have found a curious fraction of iron-rich meteorites nonetheless. The immediate consequence being that further laboratory and statistical analysis is required to figure out what this implies. I say this because it raises some interesting questions both about the particular environment of the ice field the team has been searching and how this might effect the processes by which meteorites become exposed upon the ice surface. So not the in-situ grand finale we were hoping for, but equally it is not the end of this particular story…

Geoff and meteorite number 101. [Credit: Katie Joy]

In the meantime there will still be plenty of updates from the field, as we’re planning on collecting some ice samples tomorrow (much easier than collecting meteorite samples) for analysis back in the UK. After that we pack up and move camp back to the runway area, and should fuel allow, we’ll head to another neighbouring blue ice area to see what meteorites reside there. And then we await the planes (around 16th, in theory), and the statistics……

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