AG Petrology of the Ocean Crust Room 5300 Department of Geosciences University of Bremen Klagenfurter Straße (GEO) 28359 Bremen Germany Phone: +49 421 218 65406 Fax: +49 421 218 65429 Email: srausch@uni-bremen.de

Research interests

Thesis: Timing and magnitude of CO₂ uptake by ocean crust through seawater interaction and carbonate veining.

Seawater circulation through the ocean crust has profound effects on both the physical and chemical properties of the oceanic crust. Mineral precipitation is also of major importance from a chemical perception: carbonates are forming most abundantly during low-temperature alteration, changing the overall composition of the oceanic lithosphere and making seawater-related alteration of oceanic crust a significant component of the global carbon cycle. Element transfer between seawater and rocks of the oceanic crust has been quantified by different authors using either the rock record or ridge flank fluid compositions. A more integrative approach for estimating chemical exchange budgets is analysing vein minerals from basaltic crust and using their composition to reconstruct element ratios of the seawater-derived fluid from which they precipitated.
We investigated carbonate veins from a large number of IODP cores,

• we logged the carbonate abundance to give an estimation about how exceedingly the ocean crust act as a sink for CO₂,
• on the one hand carbonate veins, which show no interaction with the basement, are good indicators for past seawater composition,
• on the other hand, carbonate veins can be used to understand chemical exchange processes between seawater and the ocean crust.

Expedition 330 Louisville Seamount Chain
Besides the main goal of this cruise was to get more information about hotspot motion and evolution of magmatic systems, we are interested in secondary minerals precipitating during alteration of the seamounts and we want to get information about what they tell us about the processes and magnitudes of chemical exchange between seawater and the basement during seamount evolution. We want to

• determining the extent of carbonate veining,
• estimating formation conditions of vein minerals (carbonates, zeolites, clay minerals) from compositional and isotopic characteristics. In cooperation with Fabien Deschamps, Université de Montpellier, France
• examining the timing, sequence, and chemical effects of both subaerial weathering and submarine alteration. In cooperation with Erdenesaikhan Ganbat, Tohoku University, Japan,
• documenting the extent and type of microbial colonization of the rocks. In cooperation with Louise Anderson University of Leicester.

Curriculum vitae

• 2012 - 2014: Postdoctoral scientist, University of Bremen
• 2007 - 2012: Doctorate Student in Geoscience, "Timing and magnitude of CO₂ uptake by ocean crust through seawater interaction and carbonate veining", University of Bremen
• 2005 – 2007: Diploma in Geoscience, with a major in Geochemistry and subsidiary subjects Mineralogy and Geophysic, Georg-August University of Göttingen
• 2006 – 2007: Diploma thesis in Geoscience, "Geochemical signatures in subduction zone magmatism at Volcán Barú in Panama", Georg-August University of Göttingen
• 2005 – 2006: Diploma mapping project "Lithological and structural geological mapping of the Guacha Corral shearzone in the Sierra de Comechingones, east of Merlo, Province Córdoba, Argentina", Georg-August University of Göttingen
• February 2005: Bachelor of Science in Geoscience, "Viskositäten von CaO-Al₂O₃-SiO₂-Schmelzen" (Viscosity of CaO-Al₂O₃-silicate melts), Georg-August University of Göttingen
• 2001 – 2007: Student of Geoscience, Georg-August University of Göttingen

Publications

• Rausch S, Böhm F, Bach W, Klügel A, Eisenhauer A (2013): Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 Million years. Earth and Planetary Science Letters 362, 215-224.
  | doi:10.1016/j.epsl.2012.12.005 |
• Koppers AAP, Yamazaki T, Geldmacher J, Gee JS, Pressling N, Hoshi H, Anderson L, Beier C, Buchs DM, Chen LH, Cohen BE, Deschamps F, Dorais MJ, Ebuna D, Ehmann S, Fitton JG, Fulton PM, Ganbat E, Hamelin C, Hanyu T, Kalnins L, Kell J, Machida S, Mahoney JJ, Moriya K, Nichols ARL, Rausch S, Sano SI, Sylvan JB, Williams R (2012): Limited latitudinal mantle plume motion for the Louisville hotspot. Nature Geoscience 5, 911-917.
  | doi:10.1038/NGEO1638 |
• Bach W, Rosner M, Jöns N, Rausch S, Robinson LF, Paulick H, Erzinger J (2011): Carbonate veins trace seawater circulation during exhumation and uplift of mantle rock: Results from ODP Leg 209. Earth and Planetary Science Letters 311, 242-252.
  | doi:10.1016/j.epsl.2011.09.021 |
• Webb SL, Banaszak M, Köhler U, Rausch S, Raschke G (2007): The viscosity of Na₂O-CaO-Al₂O₃-SiO₂ melts. European Journal of Mineralogy 19, 681-692.
  | doi:10.1127/0935-1221/2007/0019-1765 |

Conference Abstracts

• Rausch S, Böhm F, Eisenhauer A, Klügel A, Bach W (2011): Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca and Sr/Ca in the past 30 Million years. Goldschmidt Conference, Prague, 15h.
• Böhm F, Eisenhauer A, Fietzke J, Rausch S, Bach W, Klügel A (2011): Calcium isotope fractionation during dolomite formation. Goldschmidt Conference, Prague, 15i.
• Rausch S, Böhm F, Eisenhauer A, Klügel A, Bach W (2011): Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca and Sr/Ca in the past 30 Million years. IODP-ICDP Kolloquium, Westfälische Wilhelms-Universität Münster, 141.
• Rausch S, Deschamps F, Dorais M, Bach W, Klügel A (2011): Veining and alteration in rocks from the Louisville Seamount Chain (IODP Leg 330) – consequences for crust-seawater exchange budgets. IODP-ICDP Kolloquium, Westfälische Wilhelms-Universität Münster, 143.
• Böhm F, Eisenhauer A, Krabbenhöft A, Rausch S, Bach W, Klügel A, Tang J, Dietzel M (2011): Strontium and Calcium isotope fractionation of inorganic calcite. IODP-ICDP Kolloquium, Westfälische Wilhelms-Universität Münster, 32.
• Rausch S, Bach W, Böhm F (2010): Calcium carbonate veins in oceanic crust - recorders of seawater-crust exchange and past seawater composition. DMG Jahrestagung, Westfälische Wilhelms-Universität Münster, 158 (S12-T07).
• Rausch S, Klügel A, Bach W, Böhm F (2010): Carbonate veins as recorder of seawater-crust interaction. IODP-ICDP Kolloquium, Universität Frankfurt, 118.
• Böhm F, Eisenhauer A, Rausch S, Bach W, Klügel A (2010): Calcium and strontium isotopes in low temperature alteration carbonates of the ocean crust. IODP-ICDP Kolloquium, Universität Frankfurt, 34.
• Rausch S, Klügel A, Bach W, Böhm F (2009): Carbonate veins as recorder of seawater-crust interaction. Goldschmidt Conference, Davos, A1075.
• Böhm F, Eisenhauer A, Rausch S, Bach W, Klügel A (2009): Calcium isotope systematics of low temperature alteration carbonates in the ocean crust. Goldschmidt Conference, Davos, A133.
• Rausch S, Böhm F, Klügel A, Bach W (2009): Timing and magnitude of CO₂ uptake by ocean crust through seawater interaction and carbonate veining. IODP-ICDP Kolloquium Universität Potsdam, GFZ Potsdam, 25-27.
• Böhm F, Eisenhauer A, Rausch S, Bach W, Klügel A (2009): Calcium isotope systematics of low temperature alteration carbonates in the ocean crust. IODP-ICDP Kolloquium Universität Potsdam, GFZ Potsdam, 25-27.
• Böhm F, Rausch S, Eisenhauer A, Bach W, Klügel A (2008): Low temperature alteration carbonates in the ocean crust and their importance for the CO₂ uptake and the global Ca cycle. Geochimica et Cosmochimica Acta 72, A93.
• Rausch S, Wörner G (2007): Evolution of adacitic magmas at Volcan Barú (Panama). 20th Colloquium on Latin American Earth Science (LAK), Kiel, 294-295.