Accretionary Wedge #9

This month’s collection of geoblogospheric musings, concerning Geological Events of Unusual Significance, is being hosted by Julian over at Harmonic Tremors. Shamefully, I didn’t write anything, but given the quality on offer, I don’t think you’ll miss my witterings too much.

Categories: bloggery, links

Fear and loathing in Johannesburg (but some hope too)

My readers may or may not have heard about the xenophobic attacks that have been taking place in some of the poorer districts of Johannesburg over the past week or so, which have claimed almost 50 lives so far and driven thousands more from their homes. For the little that it’s worth, the sprawl and segregation of Jo’burg mean that I’m personally in very little danger; it is the people who live in the outer townships, home to the poorer segments of society, who are bearing the brunt.
Every time you drive anywhere in South Africa, you are made aware of how poor many people here still are, and the enormity of the task facing any government trying to fix the mess the apartheid system left behind – an infrastructure and economy built to service the needs of a small proportion of the population, with the rest shunted out into the wilderness and used only as a source of cheap labour. However much money is thrown* into building proper houses, and schools, and creating jobs, it’s really just a drop in the ocean; such vast inequalities are not going to be closed in less than a generation, maybe not even two. Such slow progress is obviously a great disappointment to the many poor black people who have now seen a decade-and-a-half of representative government come and go without seeing a vast improvement in their lot. The fact that corruption probably plays a not insignificant supporting role in the slow pace of change can’t help; add in a lot of immigrants (several million Zimbabweans have fled across the border in recent years) to compete for the scraps with as a source of resentments both real and imagined, and it’s easy to see how things can blow up – although resorting to violence of this nature is a tragedy for all.
It’s easy to get gloomy about such things, and what this means for South Africa’s future, so I was immensely cheered this morning when I walked into work through a large-ish group of University of Johannesburg students standing outside the main gate, holding an impromptu demonstration against the violence, and the xenophobia which at least in part is driving it. I’m not sure what put a smile on my face more: the fact that students of all races were willing to make this public statement, or that pretty much every car that drove past them was enthusiastically accepting their invitation to use their horn in support. You can argue over the effectiveness of such gestures, but as a spontaneous outpouring of goodwill from all concerned, it was nice to see.
*The precise balance between spending the vast sums that this development requires, and keeping the economy that generates this wealth healthy, is the cause of much angst within the ANC, which is really two or three different political parties cynically refusing to split up so as to maintain a stranglehold on power.

Categories: bloggery, ranting

The business of research

There was an interesting article in Science last week, which argues that a successful career in research requires much the same skills as running a successful business. The author, Peter Fiske, argues that a number of business strategy ideas can be profitably employed in the academic arena, which may be particularly relevant as the competition for research funding becomes ever more intense:

  • Product differentiation – developing novel ways of approaching scientific problems, or the techniques that you employ to solve them, so that you stand out as a unique individual within your particular subfield.

  • Customer base – specifically, diversifying your sources of funding, so that you are not completely reliant on the fickle attentions of one big ‘customer’ or funding body

It’s an interesting way of thinking about things, and I’d be interested to hear whether people more well-versed in the ins and outs of a successful research “business” see any value in it. However, I was also struck by another interesting point made in this article: that “most businesses are solo ventures led by one person who starts the company and then does all, or almost all, the work.” One thing that we academics like to pride ourselves on is that, for the most part, our job is more than something which puts food on the table, it’s something we believe in, and find rewarding to do, and will often sacrifice our free time to. Perhaps that’s not so different from someone who runs their own little cafe, or t-shirt printing business, or garage. We’re not the only ones who make sacrifices for a career we believe in; something that we would do well to remember from time to time, before we start thinking we’re too special.

Categories: academic life

Ripples aplenty

Last week’s geopuzzle was really just an excuse to show off more photos of the rather nice sedimentary structures preserved in the Archean rocks I visited the other week. All of the photos show preserved ripple marks. I’ve always found it difficult to picture how turbulent river and tidal currents always manage to produce these lovely regular structures; it seems that I’m not the only one, as apparently modelling these things is pretty hard. Nonetheless, you can get a lot of environmental information from these bedforms:

  • Type of current – constant, unidirectional currents tend to form ripples with a steep side facing in the direction of flow, and a shallow side facing away from the direction of flow. In tidal environments, where you get oscillating back and forth currents generated by waves, the ripples tend to be much more symmetrical in form.

  • Current speed – long straight ripple crests tend to indicate slightly slower current speeds than shorter, sinous ones. I assume (but am not certain) that this is something to do with increasing turbulence as the water starts flowing faster.

I thought that the most obvious difference between the first two photos was that the ripple crests in the second photo are much more undulating in form. However, most commentators also picked up on an apparent difference in their symmetry – the first photo appears to have asymmetric ripples formed by a constant current flowing from right to left, whereas the second photo appears to show much more symmetrical ripples consistent with oscillating tidal currents. Looking again, I think y’all might be right.

gp11-1a.jpg

gp11-2a.jpg

The final photo, as I said at the time, was tricky. A couple of people noticed that there appear to be two sets of ripples, indicating different current directions, preserved on the same bedding surface:

gp11-3a.jpg

These interfering sets of ripples are thought to be yet another example of the binding activity of those Archean bacterial mats: the idea is that mat growth stops earlier ripples from being completely reworked by later seasonal currents, which have a different direction. Of course, this implies that these ripples are also formed by the flow of water rather than being aeolian (wind-blown), as a couple of people thought. If this interpretation is correct, then these structures formed in the inter-tidal zone, so we’d expect them to be fairly symmetrical; what do you think?

Categories: geopuzzling

Pangaea Day, geology-style

Over the weekend Chris of Goodschist challenged the geoblogosphere to reappropriate Pangaea Day, by taking advantage of Ron Blakey’s fantastic palaeogeographic maps to show where the rock beneath our current abode was located on the dinosaur-laden Mesozoic supercontinent. Callam and Brian have both responded, and I’m belatedly weighing in:

Pangea.jpg

In the late Triassic (around 220 million years ago), South Africa was actually pretty much where it is now in terms of latitude, but it was located in the centre of a much larger landmass (often referred to as Gondwana) consisting of Africa, South America, India, Antarctica, and Australia, which had amalgamated several hundred million years earlier, and then collided with Laurentia (North America) and the other ancient continents to form Pangaea towards the end of the Permian. Since then, of course, all of these other landmasses have rifted away, forming the modern oceanic basins which now separate them.

Categories: deep time, geology, Mesozoic, past worlds