Professional Experience

since 01/2019

Postdoc in Collaborative Research Center (CRC) 1349 "Fluorine-Specific Interactions" at Free University Berlin, Germany, Institute of Geological Sciences, Mineralogy-Petrology Group

02/2016 - 01/2018

Marie Skłodowska-Curie Fellow (Horizon 2020 Individual Fellow-ship Nr. 655421, HYDIN) at University of Helsinki, Finland,  Department of Geosciences, Geofluids Group

05/2012 - 01/2016

Postdoctoral researcher at Technical University Berlin, Germany, Institute for Applied Geoscinece, Mineralogy and Petrology Group, including teaching, BSc and MSc supervision, management of the sample preparation and chemical laboratory and the hydrothermal apparatus

05/2010 - 01/2011

Visiting graduate student at Economic Geology Group, McGill University, Montréal, Canada. Collaborators: Artaches A. Migdisov, Anthony E. Williams-Jones

02/2008 - 04/2010

Set-up and maintenance of laboratory for pre-concentration of samples for rare-earth element analysis in water at University Tübingen, Germany

11/2007 - 01/2008

Design and construction of ultra clean atmosphere high temperature oxidation oven at University Tübingen, Germany

Education

02/2008 - 05/2012

PhD Candate, University Tübingen, Germany, Faculty Geoscience

Thesis: Element Mobility in Hydrothermal Systems

Degree: Dr. rer. nat. in geoscience 

10/2003 - 01/2008

Student of geology and mineralogy, University Tübingen, Germany

Thesis: Oxidation defektreicher SiC-Einkristalle (Oxidation of defect-rich SiC single crystals)

Degree: Diploma in mineralogy

Professional affiliation

Reviewer for:

• Applied Geochemistry
• Journal of Mineralogy and Geochemistry
• American Mineralogist
• Foundation for Polish Science

Invited Seminar Talks

• WWU Münster, Germany, 2018
• University Potsdam, Germany, 2018

Past

01/2017 - 05/2017

Lecture and practical: Quantitative thermodynamics in metamorphic petrology (incl. microscopy and computational exercises with PerpleX), MSc-level, 4h weekly, University of Helsinki

10/2012 - 01/2016

Lecture: Introduction to igneous and metamorphic petrology, advanced BSc-level, 2h weekly, TU Berlin

10/2012 - 01/2016

Practical course: Petrographic transmitted light microscopy, advanced BSc-level, 2h weekly, TU Berlin

08/2012 - 09/2015

Field classes: Geological mapping, Alps and Münchberger Masse, advanced BSc-level, 1 week each, TU Berlin

06/2012 - 06/2015

Field class: Geology of the Harz mountains, introductory BSc-level, 3 days, TU Berlin

10/2011 - 02/2012

Practical course: Petrography in hand specimen, beginners BSc-level, 2h weekly, University Tübingen

10/2005 - 02/2007

Tutorial: physical chemistry, thermodynamics and electro chemistry, Diplom(MSc)-level, 1h weekly, winter terms only, University Tübingen

Topics of supervised and co-supervised theses (selection):

2018 MSc thesis:

A Reconnaissance Study on the Distribution of Critical Metals in Rock-forming Trioctahedral Micas of Fennoscandian S-, I-, And A-type Granites; University of Helsinki

2017 MSc thesis:

Emplacement conditions and wallrock reactions of pegmatitic granitoid dykes in Kopparnäs, Southwestern Finland; University of Helsinki

2017 MSc thesis:

Trace element budget of mafic minerals in diverse Fennoscandian granitoids; University of Helsinki

2015 MSc thesis:

Thermometry and trace element chemistry of black-wall tourmalines from the western Tauern Window; TU Berlin

2014 BSc thesis:

Reconstruction of mantle sources and magma ascent from trace elements in xenolithic olivine in basanite from the Eger graben; TU Berlin

2014 BSc thesis:

Reconstruction of melt fractionation from auto-metasomatic reaction textures in feldspars in phonolites from the Eger graben; TU Berlin

2014 MSc mapping:

Petrological and structural geological mapping of Furtschaglgrund, south-western Tauern Window; TU Berlin

Current research interests

Element mobilization by aqueous crustal fluids:

Mobilization and transport of elements in the Earth's crust are important processes for the formation of ore deposits and for global element cycles. The primary transport mechanisms involve either melts or fluids as mobile phases. Anions play a major role in controlling the transport of cations in fluids by complexation. Most economically interesting elements, including the so called "High Tech Metals" such as rare-earth elements, are transported mainly as cations comblexed by anions in fluids. Chlorine and fluorine are the two most abundant halogen elements on Earth and two of the most important anions in geological fluids. Understanding the influence that these elements have on cation transport is therefore crucial. Combining observations on natural systems from the large scale of entire ore deposits to the small scale of electron microscopy with numerical computer modeling provides the most detailed insights into such problems. However, the computer models require input data in form of the physical and chemical properties of the elements of interest under the high pressures and temperatures in the Earth's crust. While some such data are available, tackling new and exiting questions often means that we need to obtain the relevant data ourselves by laboratory experiments. Especially the complexation of metals critical for high tech applications with fluorine is not well known today and a current topic of our research.

The critical role of fluoride in aqueous crustal fluids:

The solubility and therefore mobility of cations in aqueous fluids of the Earth's crust varies by many orders of magnitude from element to element and strongly depends on the form in which the cations are dissolved. Large cations with low charges like Na⁺ or K⁺ can be kept in solution by direct hydration with water molecules. Small, highly charged cations, like Y^3+, Zr⁴⁺ or Nb⁵⁺ can only be dissolved in form of complexes with anions. This group of elements is called the High Field Strength Elements (HFSE). The smaller and more highly charged a cation is, the greater its tendency to preferentially form complexes with small anions. Because fluorine forms the smallest naturally occurring ion (fluoride = F^-), it is critical for transport and ore formation of many HFSE. However, because fluoride is analytically challenging and difficult to work with in the lab, there is a severe shortage of important experimental data on fluoride complexation. We are working on filling this gap in order to develop predictive models for hydrothermal HFSE deposits.

Current Grants

Collaborative Research Center (CRC) 1349 "Fluorine-Specific Interactions", project A7 | John "Geochemical Mobilization of Rare-Earth Elements by Poly-Hydrogen-Fluoride Based H···F Bridge Networks", together with Prof. Dr. Timm John and PhD candidate Shilei Qiao

Field Experience

2012 - 2015

Petrological and tectonic mapping at Pfitscher Joch, Tauern Window. Two weeks each Year while teaching a field course.

Publications (peer reviewed)

Zhong, X., Loges, A., Roddatis, V., John, T. (2021) Measurement of crystallographic orientation of quartz crystal using Raman spectroscopy: application to entrapped inclusions. Contrib Mineral Petrol 176, 89. https://doi.org/10.1007/s00410-021-01845-x

Schultze, D., Wirth, R., Wunder, B., Loges, A., Wilke, M., Franz,G. (2021): Corundum-quartz metastability: the influence of a nanometer-sized phase on mineral equilibria in the system Al₂O₃–SiO₂–H₂O. Contributions to Mineralogy and Petrology 176. https://doi.org/10.1007/s00410-021-01786-5

Loges, A., Schultze, D., Klügel, A., Lucassen, F. (2019): Phonolitic melt production by carbonatite Mantle metasomatism: evidence from Eger Graben xenoliths. Contributions to Mineralogy and Petrology 174. https://doi.org/10.1007/s00410-019-1630-2

Grüneberger, A.M., Schmidt, C., Jahn, S., Rhede, D., Loges, A., Wilke, M. (2016): Interpretation of Raman spectra of the zircon–hafnon solid solution. European Journal of Mineralogy 28, 721–733. https://doi.org/10.1127/ejm/2016/0028-2551

Büchner, J., Tietz, O., Suhr, P., Loges, A., Franz, G. (2015): Field trip 3: Cenozoic Lausitz Volcanism and its Basement. GeoBerlin 2015. Exkursionsführer/Excursion guide. – Exkf. u. Veröfftl. DGG 17–34.

Göb, S., Loges, A., Nolde, N., Bau, M., Jacob, D.E., Markl, G. (2013): Major and trace element compositions (including REE) of mineral, thermal, mine and surface waters in SW Germany and implications for water–rock interaction. Applied Geochemistry 33, 127–152. https://doi.org/10.1016/j.apgeochem.2013.02.006

Loges, A., Migdisov, A.A., Wagner, T., Williams-Jones, A.E., Markl, G. (2013): An experimental study of the aqueous solubility and speciation of Y(III) fluoride at temperatures up to 250°C. Geochimica et Cosmochimica Acta 123, 403–415. https://doi.org/10.1016/j.gca.2013.07.031

Loges, A. (2012): Element Mobility in Hydrothermal systems (Dissertation). University Tübingen.

Loges, A., Wagner, T., Barth, M., Bau, M., Göb, S., Markl, G. (2012): Negative Ce anomalies in Mn oxides: The role of Ce4+ mobility during water–mineral interaction. Geochimica et Cosmochimica Acta 86, 296–317. https://doi.org/10.1016/j.gca.2012.03.017

Loges, A., Wagner, T., Kirnbauer, T., Göb, S., Bau, M., Berner, Z., Markl, G. (2012): Source and origin of active and fossil thermal spring systems, northern Upper Rhine Graben, Germany. Applied Geochemistry 27, 1153–1169. https://doi.org/10.1016/j.apgeochem.2012.02.024

Göb, S., Wenzel, T., Bau, M., Jacob, D.E., Loges, A., Markl, G. (2011): The redistribution of rare-earth elements in secondary minerals of hydrothermal veins, schwarzwald, southwestern germany. The Canadian Mineralogist 49, 1305–1333. https://doi.org/10.3749/canmin.49.5.1305

Presser, V., Loges, A., Nickel, K.G. (2011): A Novel Approach for Oxide Scale Growth Characterization: Combining Etching with Atomic Force Microscopy (AFM), in: Scanning Probe Microscopy in Nanoscience and Nanotechnology. Springer, Berlin, pp. 355–383.

Presser, V., Nickel, K.G., Loges, A., Berthold, C. (2010): Reduced thermal conductivity during wear keeps surfaces hot. Scripta Materialia 62, 219–222. https://doi.org/10.1016/j.scriptamat.2009.10.041

Presser, V., Loges, A., Wirth, R., Nickel, K.G. (2009): Microstructural Evolution of Silica on Single Crystal Silicon Carbide. Part II: Influence of Impurities and Defects. Journal of the American Ceramic Society 92, 1796–1805. https://doi.org/10.1111/j.1551-2916.2009.03085.x

Presser, V., Loges, A., Hemberger, Y., Nickel, K.G. (2009): Microstructural Evolution of Silica on Single-Crystal Silicon Carbide. Part I: Devitrification and Oxidation Rates. Journal of the American Ceramic Society 92, 724–731. https://doi.org/10.1111/j.1551-2916.2009.02930.x

Presser, V., Loges, A., Nickel, K.G. (2008): Scanning electron and polarization microscopy study of the variability and character of hollow macro-defects in silicon carbide wafers. Philosophical Magazine 88, 1639–1657. https://doi.org/10.1080/14786430802243865

Loges, A. (2008): Oxidation defektreicher SiC-Einkristalle (Diplom). University Tübingen.