Billion years, Plate tectonics, Geology, Earth science H Workshop 2021 – GPlates updates by Dietmar Muller
Right now. One of the things that john cannon is currently working on is implementing a view tilt and perspective view functionality in g plates. So this is still a little bit experimental, and so this is what a tilted view of a visualized mental volume that could be seismic tomography or the output of a metal convection model would look like this is not yet working for rasters or filled polygons. So the way it works when we drag the mouse to tilt the view and to move from the standard, 3d orthographic view to the perspective view so here’s a um, a perspective view. That is a little different from the previous view. So so this is how the eyes would see um a perspective, so distant objects would appear smaller, and this is also not yet working for rasters or filled polygons now, there’s, quite a few build system improvements and that are um underway now for g plates we’ve been Used we’ve been using the alt c, make for 10 years and now there’s a modern version that is much better at managing dependency, libraries, supporting new compilers, c, plus plus standards, etc and q, be it our graphics, library, qt is now moving towards qt5 and support of Qt5 is especially needed for modern linux platforms, which no longer support qt4, which is what we’ve been using, and so this is all happening behind the scenes to improve g plates um. Similarly, um um apple computers, um in in particular um, require uh.
Now the um, open, graphics, library, opengl, 3 car and unfortunately, there is not backward compatible with the old opengl1 that n2 that has been used in many places in g plates. So we are now being forced to upgrade our entire graphics engine, and the only good news is that opengl 3 will enable us to implement better symbology something that users have called for for a long time. G plates 2.3, which is the next version, and that will also be able to make use of all available resolution um on high resolution displays such as the apple retina displays i’ve briefly mentioned symbology before um. We have had many requests over the years, especially for subduction teeth, and they are now finally coming along with other, more elaborate symbols for points line patterns, fill patterns, etc, and so this would be quite a substantial improvement for g plates in terms of being able to Visualize plate reconstructions and the way we’re used to looking at them on maps with the relevant symbols for plate boundaries and other points. Pi g plates on os is now finally signed with a valid developer certificate and notarized by apple. So this is quite important to reduce hassles, that users have end users have in installing 5g plates on their apple machines, currently we’re, exposing the g plate’s ability to do crustal thinning and adding the ability for to model tectonic substance in pie g plates. So this is all um underway and, of course, particularly important for a base and modeling and linking the output of deforming plate models from g plates to create maps of isostatic topography through a time in regions where either crustal thinning or crustal thickening is taking place.
So when it comes to subsidence of basins, of course, we have syn rift substance due to stretching and then pulse drift subsidence due to cooling um. Both of these processes will now be captured in ng plates as soon as this functionality is fully implemented. I’M sure some of you um know about the g plates forum, um, so it’s, our online vehicle um to engage g plates users to ask questions, get notified of new releases and that form is called discourse.gplates.org and i’ve here added a short, a small snapshot of the G plate discourse usage over the last quarter and you can see there’s quite a lot of activity uh. One of the things that i found curious that we have, in addition to logged in users, anonymous users and crawlers. Now uh, perhaps there’s someone in the audience who can explain to me exactly what differentiates a crawler from an anonymous user. Recently, we’ve also added a globe to our g place portal that’s quite useful for bayesian genesis, hard work purposes, it’s a lithology globe that is based on the geolim 1.0 model and is published by the commission for the geological map of the world. So a digital data set for this map is available and all the anthologies Music listed on the right hand, side are visualized overlaying over a digital elevation model that that can be scaled appropriately by the user. So, for example, if one wanted to set up a badlands model – and that is that is driven by different erodibilities associated with different lithologies, the lithology globe would would be a first go to point to have a look.
What the different lithologies are that are currently exposed in your area of interest and gives you an idea for how to proceed by pure accident. I ran across this wonderful website called the world building pasta where you, where you find a very elaborate tutorial on how to use g plates for beginners. That was created in the middle of last year, and i looked at it and i was quite impressed. This is quite a long list of of explaining how to build a plate model from scratch. Um, starting with the basics um, you know generating rotations generating plate boundaries and ocean crust, uh through isochrones, um and it’s, a fantastic uh example of how the community can be engaged and software. In fact, uh does take on um a life of its own. To some extent, with tutorials being put together that we don’t even know about until we discover them so for all those g place enthusiasts amongst you, i highly recommend subscribing to world building pasta uh. The last um few slides of my update uh relate to the recently um published plate model by andrew meredith and others um then that’s now out in earth science reviews and that’s the first um topological plate reconstruction with moving boundaries through time from a billion years ago. To the present, and so it starts before the assembly of rodinia, where the world looked really pretty different from today. Um and uh moves all the way to the to the present and here’s um.
The paper and earth science reviews um here’s a snapshot 500 million years ago after a rodinia, breakup and and here’s a small set of globes and that illustrates the evolution of earth’s tectonic plates from a billion years ago, taught the assembly of rodinia around 900 million years Ago and then followed by disintegration and later the assembly of pangaea, and so this animation um is on the earth by youtube channel and of course, was uh has gone completely viral on twitter a few days ago. I think it was reposted about two thousand four hundred times and has nearly six thousand six thousand likes or something like that. Yeah and so it’s it’s clearly been quite uh popular and they will form the basis for a future deep time. Um analysis of the connection between tectonic plates and the mantle as well as surface processes.