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Basement dykes in Panafrican crust, Sinai Peninsula

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New paper out - Crustal Structure of the Andean Foreland in Northern Argentina: Results from Data-integrative Three-dimensional Density Modeling

I am co-author on a paper by Christian Meeßen (GFZ) investigating the crustal structure of the Andean foreland in Argentina. The paper is published in J. Geophys. Research, currently in “Early View” - Here's the abstract:

Previous thermomechanical modeling studies indicated that variations in the temperature and strength of the crystalline crust might be responsible for the juxtaposition of domains with thin-skinned and thick-skinned crustal deformation along strike the foreland of the central Andes. However, there is no evidence supporting this hypothesis from data-integrative models. We aim to derive the density structure of the lithosphere by means of integrated 3-D density modeling, in order to provide a new basis for discussions of compositional variations within the crust and for future thermal and rheological modeling studies. Therefore, we utilize available geological and geophysical data to obtain a structural and density model of the uppermost 200 km of the Earth. The derived model is consistent with the observed Bouguer gravity field. Our results indicate that the crystalline crust in northern Argentina can be represented by a lighter upper crust (2,800 kg/m3) and a denser lower crust (3,100 kg/m3). We find new evidence for high bulk crustal densities >3,000 kg/m3 in the northern Pampia terrane. These could originate from subducted Puncoviscana wackes or pelites that ponded to the base of the crystalline crust in the late Proterozoic or indicate increasing bulk content of mafic material. The precise composition of the northern foreland crust, whether mafic or felsic, has significant implications for further thermomechanical models and the rheological behavior of the lithosphere. A detailed sensitivity analysis of the input parameters indicates that the model results are robust with respect to the given uncertainties of the input data.

Citation: Meeßen, C., Sippel, J., Scheck-Wenderoth, M., Heine, C., & Strecker, M. R. (2018). Crustal structure of the Andean foreland in northern Argentina: Results from data-integrative three-dimensional density modeling. Journal of Geophysical Research: Solid Earth, 123. Doi:10.1002/2017JB014296

Drawing a line

A new series of prime examples for software with bad UI - today: Trying to generate an annotated line for strike-slip faults in ArcMap 10.4. It takes a serious number of 5 (repeat F-i-v-e!) windows that need to be opened to change the marker style symbol along a line to generate the symbology for what is going to be a strike slip fault. Oh, and of course one needs to read up quickly on the web on how to do it in the first place if you haven't done this in a while. I mean, seriously ESRI? Yes, Windows was exciting back in 1996, but hey, it's 2017… In QGIS all the symbology is located in one window and the whole interface is pretty intuitive. What's the reason again that corporate IT can not sponsor efficient, open source software?

The joys of working with ArcMap - it needs 5 open windows to change the arrow style along a strike slip fault symbology...

2017/08/29 14:53 · christian · 0 Comments

Updated PostgreSQL-PostGIS install instructions

I have updated my installation instructions for PostgreSQL/PostGIS on macOS - see the PostgreSQL and PostGIS page for details.

2017/06/21 08:25 · christian · 0 Comments

Uncertainty estimates?

Old, but still true…

 XKCD File extensions

Source: XKCD

2017/04/02 20:31 · christian · 3 Comments

Exploration Tectonics 2017

The 2017 version of the Exploration Tectonics course will be taught in Bochum from 07-09.August 2017, during the 2nd or 3rd week of the summer semester break. More info and updates on the course page over the next few weeks.

2017/03/01 23:27 · christian · 0 Comments

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start.txt · Last modified: 2017/11/11 20:45 by christian