As you may know, my Mum and step-dad were here, and as he is (among many other things) a geologist, I organised a two day geology tour to take in the sights of Oman. It turns out that Oman is fairly unique in geology terms, as it's one of the few places on earth where you can see rocks formed on the ocean bed (ophiolites) and the earth's mantle. Yes, the bit under the earth's crust - apparently, the earth is like a peach, with the skin being the crust, the flesh being the mantle, and the stone being the earth's core. The skin / crust can be up to 35km deep, so you can imagine that being somewhere where the crust is under your feet is pretty exciting for geology types.
Anyway, as my long-suffering mother seems to spend a lot of time sitting around while her other half looks at rock faces, I thought it would be good to have someone else to take him to the best spots and talk rocks with him - and it was actually really interesting for me and my mum too, and took us to some great out-of-the-way spots. Oman rocks really do rock!
So, here are a few highlights of our trip;
The Geotimes Pillow Lava Formation - this is lava that has flowed out of a crack in the earth and then solidified under the sea. Of course, the lava flows we saw would have happened many thousands of years ago, but it's still happening today in the oceans around Hawaii and other places where there are undersea volcanoes;
Above the pillow lava, there are layers of sedimentary rocks - muds and other materials that have settled on the bottom of the ocean on the floor and eventually been turned into rock. All sorts of different minerals create a range of colours, and the stripes are always interesting to look at.
Below the pillow lava though, there are other kinds of rocks made by the magma chamber that the lava has come out of - there are dykes that flow upwards, and the magma in the chamber also cools when it reaches the outer edges of the chamber, creating a different kind of layering called layered gabbros -we walked up the beautiful cool stream of Wadi Haylayn to see these examples;
And than below that, the mantle - and here is one of the places where you can see it really clearly, in Wadi Abyad at the bottom of the Hajar mountains in Oman. You can see the darker rock under the mantle - we think this was Dunnite - and the lighter gabbros above it. And as you can see, we even got a quick swim at the end of our dusty rock-hunting! It's not all dry desert here, you know ...