A productive few days out and about

Katie Joy | 16 Jan 2020

Although most of the team are now heading north back to the UK, Taff and I are still working hard at our field site and it’s been a productive and busy few days out in the field as we wrap up the season with some surface meteorite searching on two of the ice fields that we visited last year. Revisiting sites is interesting as some of our old tracks are still preserved as imprints in the snow patches like fossilised tracks, indicating past exploration. Both areas are much clearer of fresh snow now than last year (though they still have some thicker patches of older snow), and as there has been less wind it has been pleasant getting out and about and systematically covering the ground to try and find as many samples as possible.

Meteorite sample encased within ice. Just the top portion was poking out and we had to dig the rest of the sample out. [Credit: Katie Joy]

We managed to collect seven samples on the 14th (including a nice big one spotted from about 100 m away), two samples yesterday (rewards for a lot of driving around getting frustrated that we weren’t finding much), and four more today on the 16th (including a nearly completely ice submerged sample), bringing the total number of meteorite stones collected to 82 from this area in total from this year. Several meteorites found over the last few days have been stunning — really nice flight shaped stones preserving evidence of the orientation they travelled through Earth’s atmosphere. A couple others have very fresh fusion crusts suggesting they might be recent falls, and some have hints of pale coloured interiors which look different from the normal chondrite type (primitive asteroid) of samples that we most commonly collect.

We are not sure how many more days we will have in the field as we now await a break in the weather for a plane to travel over from Rothera to collect us — but tea supplies and moral levels are high, and we will keep getting out searching until before our skidoo petrol runs down. Then we will drink some more tea and reflect on a great end to the season.

Cracking ice – as the ice field extends and the ice speeds up it cracks and twists into small faults a few cms wide. We don’t typically find meteorites in areas like this, but sometimes have to drive past and it is like a structural geology lecture in action. [Credit: Katie Joy]
Taff pointing the way to the stunning meteorite (a whole stone) we found today with a rollover lip. [Credit: Katie Joy]

PS Thanks to our Sledge Victor teammates Romain, Geoff and Wouter, and quizmaster K for the amazing sausage roll song rendition over skeds. We didn’t think you would deliver, but you didn’t fail us. Quite magnificent. Who knew there were so many verses to get through. We hope that your travel back to the UK goes well, and see you back Manchester way. 119 is a lot cleaner without you. 🙂

(Still) Chasing Meteorites

Katie Joy | 13 Jan 2020

The remaining team of Taff and Katie are still in the field at Outer Recovery and after two tent days (one because the winds were blowing at 30 knots all day, and yesterday due to bad contrast as it was cloudy) we made it out and about for some more meteorite searching. The high winds of a couple of days ago has blown away all the pretty hoar frost which was covering the area, but also more importantly has shifted the snow off our local ice field meaning that we could get back there to search the final southerly section which had previously been hidden from us under a couple of centimetres of covering.

We headed out in strong cold winds, today was the first day I have had to put on the big yellow down jacket over all the other layers I have been wearing. Pretty much as soon as we started out we were off the mark with a large 15 cm stone, and despite the cold, the day continued to prove fruitful with seven more meteorites collected and bagged*. These included a very nice hand sized complete fusion crusted stone which are pretty uncommon and a tiny pea sized perfect small rounded stone. By the time we headed back to camp the winds had dropped off, making for a pleasant returning home commute.

Katie_Meteorite
A lovely fusion crusted stone sitting on a small crack on the blue ice field. [Credit: Katie Joy].

We are not sure yet of our field retrieval date – but it feels really good to get a few more meteorites collected before we have to return to Rothera.


* Well a small one nearly wasn’t bagged when a gust of wind whipped the meteorite encased in its plastic collection bag away across the ice field — I jumped on the skidoo and whizzed off chasing after it, and upon catching up jumped off the skidoo on a snow patch to make a dive… Well, I missed and fell on my butt (you try running on ice when dressed like the Michelin man), and the bag and stone flew on past me at what I can only assume must be the quickest pace it has experienced since landing on Earth. Back on the skidoo I shot off again, overtook the flying bag again and this time aligned both me and the skidoo to make the interception. Bagged meteorite retrieved and safely stored despite its best attempts to get away. I was feeling pretty cold before this chase episode, but the rapid retrieval and adrenaline shot seemed to have done the trick to warm me up.

And then there were two…

Katie Joy | 10 Jan 2020

It’s been a busy couple of days in the field as we wrap up at the end of the season. As Romain mentioned in his post, two days ago (8th Jan) we started to pack up camp ready for a move back to the skiway input site (about 2 km up the road). We were just settling into a quiet evening when we got a phone call to say that three of the team would be picked up by plane the next day. All hands to stations and we packed up camp that night and relocated so that we could be in place the next day. It was a late one by the time we went to bed, but it was good to know that the main work was out the way. In the morning we got word that the plane (trusty old Victor Bravo Charlie) had left Halley and was winging its way south to us.

The guys in the field before being collected. [Credit: Katie Joy]

Wouter, Geoff, and Romain then headed out with pilot Dave and co-pilot Tom Hulme (who helped out last year as well with our team’s collection from the field — thanks Tom!) towards Rothera, but were diverted on route and ended up last night with our friends at Halley Research Station where they could enjoy a nice warm shower and cooked dinner.

Meanwhile Taff and I have remained in the field ready for the next collection. Taff has been preparing a depot site where we can store the equipment that can’t be uplifted this year. There is a lot of work stacking up of boxes and kit, note taking, rearranging and making sure that everything will not blow away in the Antarctic winter when wind speeds can get up over 60 knots.

This afternoon we took a drive out to visit the southernmost ice field in the area where Julie and I visited last year, finding two meteorites in the process. It was a stunning drive to and from our camp site through flat white terrain, passing by the camp that Wouter, Geoff and Rob had been put into about a month ago. We drove past the remnants of their igloos: they have been dilapidated somewhat in the strong winds and now look like a beautiful ruins. Onwards to the ice field which we discovered was a lot less snow covered than last year, although some parts still had recent snow clinging to the surface. The winds there were much stronger than at camp with a lot of ice blowing along the surface, snaking its way to the west at ~30 knots. Blowy. We searched two of the main parts in a mix of systematic and recon style of search — alas no meteorites were found, but it was an absolute joy to drive around looking.

Remnants of the igloo at the guys original campsite. [Credit: Katie Joy]
Taff driving close to the ice rise at the southern ice field. [Credit: Katie Joy]

The journey back to camp was just as stunning — close to the ice field the wind was blowing hard whipping up and blowing snow, but then as we bridged a hill, it dropped off completely leaving a surface of hoar frost with ice crystals that glinted in the sunlight like a million diamonds. We weaved our way through this glittering landscape, kicking up snow crystals, making it look like the air itself was sparkling.

We await news of our uplift — but for now are enjoying being in this amazing landscape.

An erratic few days

Katie Joy | 05 Jan 2020

A busy few days for us in the field. We covered a bit more ground with the metal detection panel array system on the main local ice field , but then suffered a few setbacks when the system powered up and down again in a run. Geoff and Wouter had a day of taking everything apart, assessing what was working and not working, and in progress we discovered that the blue sledge (we had nicknamed Sledge Evatt Junior*) that was carrying our control box and battery had a rather large whole in the bottom, which had been allowing snow to enter the base of the sledge dislodging some of the equipment. Needless to say Junior has been now been retired, and we need a name for the new blue sledge which has taken its place (number 3 doesn’t really have a ring to it).

An ice pond next to Halliday ridge: several of the local rocks had clearly sunk into the ice leaving interesting bubble trails during their descent. Alas no meteorites. [Credit: Katie Joy]
Looking along the ridge of Halliday Nunatak. [Credit: Katie Joy]

Whilst all the fixing up has been going on, Romain, Taff and I covered quite a lot of ground surface searching the northern most part of the ice field — finding 7 more meteorite stones throughout the day, including one (a stony type) that was almost completely buried within the ice, only about 10% sticking out of this surface. The clouds lifted and the afternoon was warm and glorious to work in.

Last night we had a good 20 knot wind sweep through the area clearing a lot of the snow off the blue ice surface. We all headed out as a group of five to visit the ice field closest to the Recovery Glacier — a trip of about 10 km from where we are camped. We travelled there linked up on skidoos — forming a caravan of skidoos and sledges trundling across the sastrugi snow heading north for about an hour. BAS fieldguide Julie Baum and I visited this icefield last year (it was the site of my epic skidoo breakdown), and it was good to revisit it. We searched the surface for a while, finding one more meteorite sample (adding to the three we found here last year).

Systematic search on ice. [Credit: Geoff Evatt]
Wouter and Taff near Halliday Nunatak. [Credit: Geoff Evatt]
Meteorite collection with tongs. [Credit: Geoff Evatt]
Geological search on Halliday Nunatak. [Credit: Geoff Evatt]

We also scaled the local nunatak — the only rocky outcrop in this area**, to collect some geological samples and to take in the view of the ice fields and how they extend northways abutting the Recovery Glacier itself (the boundary between the two features is impressive, with large ridges, crevasses and ice cliffs). We assume this is a first ascent — so will take this high with pride. The nunatak is formed of a weathered igneous rock (granodiorite), but has lots what we call ‘erratics’ (they are called erratics as they shouldn’t be there geologically speaking) all over the top that have been dropped from the bottom of a glacier which used to run over the rocky peak. Tomorrow we plan to return to the metal detection panel searching and see how sledge number 3 (we really do need a better name) holds up. May his bottom not be broken.

Group ascent of Halliday Nunatak. [Credit: Geoff Evatt]

* You might be wondering what/who is Sledge Evatt (i.e., the senior). Well this bold name was given to the blue sledge that was carrying the control equipment for the first sledge unit we set up. Alas, senior had to be retired a few days ago when he also developed a large hole on his underside, passing the responsibility onto junior…

** Recently we requested to name this site Halliday Nunatak after Dr Ian Halliday (1928-2018) who was a Canadian astronomer with expertise in meteor (asteroid and comet) delivery rates to the Earth. His research is related to our core science project of understanding Antarctic meteorite type, delivery rates and glacial transport processes.

Let it not snow…

Katie Joy | 03 Jan 2020
A layer of snow covers the blue ice field. Helpful for subsurface searching; definitely a hindrance for surface meteorite hunting. [Credit: Katie Joy]

What a difference a bit of weather makes. This whole area was stunning blue ice a couple of days ago. Two days of gentle sustained snowing means that the whole icefield is now buried under 5 cm of snow. This is useful for the metal detector dragging activities (see Geoff’s last post) as it means that we can very easily see where we have driven (in the image above the panel tracks can clearly be seen in the lower half of the image, compared with the unsearched area in the upper part of the photo). On the other hand, these conditions are absolute killers for the surface meteorite searching activities as all the meteorites are now very disappointingly disguised by the snow cover. We need a night or two of 20 knot winds to come in and blow hard to shift all the snow. However, the weather is forecast to remain the same (~ –10ºC, 5 knot easterly wind, patchy sun and clouds) for the next couple of days.

In the meantime the subsurface meteorite hunting activities continue using the metal detector panels – we have now managed to search about 0.6 square km of the ice surface, with Wouter being an absolute legend fixing bits of the system that fail with all the bumping around on the hard ice surface.

Ploughing through the snow… Romain dragging the metal detection setup. The rough surface in the foreground is where the panels have been pulled through the snow creating obvious drag marks. [Credit: Katie Joy]

Getting surface meteorites in the bag

Katie Joy | 27 Dec 2019

Whilst the panel testing is continuing (see Geoff’s last blog post) we have also been making steady progress with searching the ice surface for meteorites that have emerged from the blue ice. As of today the count is at 35 stones from Outer Recovery — one off the total for the whole of the last recon field season.

Katie and a large meteorite “find”. [Credit: Romain Tartese]

Every rock we locate at this particular ice field is a meteorite — there are no terrestrial rocks at all, so it makes identification very easy. What is tricky is actually spotting them in the first place — often the meteorites are hiding at the bottom of suncups (small depressions made as the ice is ablated by the wind and sublimated on warmer days), and for those less than a couple of cm in size you have to be lucky to see them as you drive past on your skidoo and be looking in the right direction (for this reason we swivel our head continually as we drive like watching an end-to-end tennis match). Samples bigger than ~3 cm are easier to spot, but again can sometimes be nestled down between snow patches or in suncups. Whether you are driving into the sun, and the angle of the shadows cast at different times of the day comes into play, so although we are systematically trekking back and forth across the ice surface, not every search session results in a meteorite find: between 2 and 7 meteorites seems to be the rate of daily collection at the moment.

A small but perfectly formed flight orientated stone. [Credit: Katie Joy]

The meteorites themselves vary from a small bean-sized one we found yesterday (a lovely perfectly fusion crusted stone, suggesting that this tiny meteorite is a complete piece), to another complete stone which preserves a fusion crust that is flight shaped (i.e. we can tell which in orientation the meteorite was delivered as it travelled down through Earth’s atmosphere — these type of samples are very aesthetically pleasing, and are really cool to find), to some larger blocky stones (around the 8-20 cm size range) that look like they are pieces of a large meteorite that broke up either in space, or through erosion as it was transported through the ice [NB I am guessing that they are from the same parent meteorite at this stage based only on the colour and texture of their exterior surface, and the very similar colour and texture of their interior — this will all need to be confirmed when we do the formal classification back in the lab]. Several of the samples we found this year are like some of those we found last year, suggesting that again there might be some relationships between the samples we have collected, and others look completely different which is exciting as it means we have good diversity across the sample set collected.

So, all in all, we are progressing steadily, and hopefully will continue to get more meteorites bagged up. Today the weather has turned snowy so will have to see how this effects our search plans over the next few days.

Hope that everyone had a Happy Christmas — we had a tasty meal last night together complete with an amazing Christmas cake provided by chef Olly at Rothera (many thanks — you are a star!), and had a team drive out after testing the panel array to visit a cool ice rise (which is a bit of ice that has been squeezed up to look like a pointy mountain tip) next to the search area.

Geoff driving the detector panel arrays on the ice surface. [Credit: Katie Joy]
The team visiting a nearby ice rise on Christmas Day. [Credit: Katie Joy]

PS Many congratulations to my Aunty Angie and Tommy for getting engaged. Sorry I cant be there to celebrate with you all, but raising a cup of tea to you from the field.

PPS Thanks Isotope Group crew for sending down the birthday card. Very sweet of you all to get so organised in advance. 🙂 Much appreciated. Hope that you are all well and looking forward to the BPSC.

PPPS Dutch, we found some pina-colada flavoured energy bars in the manfood box. Definitely not as exciting as the real thing.