SEDIMENT UND ISOTOPENGEOLOGIE / SEDIMENTÄRE GEOCHEMIE

Mitarbeiter Sediment- und Isotopengeologie & Sedimentäre Geochemie / Staff Sediment and Isotope Geology & Sedimentary Geochemistry

Here we list active members of the Departments and their research focus and list staff members who have moved on. Nachstehend finden Sie eine Liste der derzeitigen und ehemaligen Mitarbeiter und ihrer Forschungsaktivitäten.

Prof. Dr. A. Immenhauser
Prof. Dr. Adrian Immenhauser
Daniel Herwartz
Prof. Dr. Daniel Herwartz

Prof. Dr. Daniel Herwartz

My present research focusses on the oxygen cycle. This includes the water cycle and chemical sediments precipitating from water. Oxyanions such as PO43-, SO43-, CO32- or Si(OH)4 dissolved in water exchange isotopes with H2O and thus conserve an isotopic record over Earth history. In the classic approach the 18O/16O isotope ratio is used to read this record, e .g. to reconstruct paleo-temperatures from carbonate rocks. Additional 17O/16O ratios provide a second dimension to the classic oxygen isotope system. This allows testing if paleotemperatures are accurate. Reconstructions of present and past water cycles are improved and critical parameters such as paleo-relative humidity can be reconstructed. Air O2 comprises particularly low 17O/16O ratios providing a natural tracer for respiration. My goal is to fully understand the underlying processes and oxygen fluxes in order to use the respective chemical sediments as faithful archives for reconstructing Earth’s history. This quantitative approach is useful to trace any oxygen bearing compound in nature and is thus suitable for a broad variety of topics. Previous research topics include fossil bones, dating of high-pressure rocks, early Earth, Snowball Earth events and cosmochemistry.


Kontakt: Lehrstuhl Sedimentäre Geochemie

Ruhr-Universtät Bochum
Fakultät für Geowissenschaften
Institut für Geologie, Mineralogie und Geophysik; Raum: IA E5/179
Universitätsstraße 150
44801 Bochum

Tel.: +49-(0)234-32-22307

E-mail: daniel.herwartz@ruhr-uni-bochum.de


Full publication list on Google Scholar: https://scholar.google.com/citations?user=igT-b0kAAAAJ&hl=en


Selected Publications:

Herwartz D., Pack A., Nagel T.J. (2021): A CO2 greenhouse efficiently warmed the early Earth and decreased seawater 18O/16O before the onset of plate tectonics. Proceedings of the National Academy of Sciences 118 (23), e2023617118. https://www.pnas.org/content/118/23/e2023617118.short

Herwartz D. (2021) Triple oxygen isotopes in igneous, metamorphic and hydrothermally altered rocks. In: Triple oxygen isotopes on Earth, edited by Andreas Pack and Ilya Bindeman, Reviews in Mineralogy and Geochemistry 86, 291-322. https://pubs.geoscienceworld.org/msa/rimg/article/86/1/291/593237

Herwartz D., Surma J., Voigt C., Assonov S., Staubwasser M. (2017) Triple oxygen isotope systematics of structurally bonded water in gypsum. Geochimica et Cosmochimica Acta 209, 254-266. https://www.sciencedirect.com/science/article/abs/pii/S0016703717302491

Herwartz D., Pack A., Krylov D., Xiao Y., Muelenbachs K., Sengupta S., Di Rocco T. (2015) Revealing the climate of snowball Earth from Δ17O systematics of hydrothermal rocks. Proceedings of the National Academy of Sciences 112, 5337-5341. https://www.pnas.org/content/112/17/5337

Herwartz D., Pack A., Friedrichs A., Bischoff A. (2014) Identification of the giant impactor Theia in lunar rocks. Science 344, 1146-1150. https://science.sciencemag.org/content/344/6188/1146

Pack A. and Herwartz D. (2014) The triple oxygen isotope composition of the Earth mantle and understanding variations in terrestrial rocks and minerals. Earth and Planetary Science Letters 390, 138-145. https://www.sciencedirect.com/science/article/abs/pii/S0012821X14000260

Herwartz D., Tütken T., Jochum K.P., Sander P.M. (2013) Rare earth element systematics of fossil bone revealed by LA-ICPMS analysis. Geochimica et Cosmochimica Acta 103, 161-183. https://www.sciencedirect.com/science/article/abs/pii/S0016703712006205

Herwartz D., Münker C., Tütken T., Hoffmann J. E., Wittke A., Barbier B. (2013) Lu-Hf systematics of fossil biogenic apatite and their effects on geochronology. Geochimica et Cosmochimica Acta 101, 328-343. https://www.sciencedirect.com/science/article/abs/pii/S0016703712005613

Herwartz D., Tütken T., Münker C., Jochum K.P., Stoll B., Sander P.M. (2011) Timescales and mechanisms of REE and Hf uptake in fossil bones. Geochimica et Cosmochimica Acta 75, 82-105. https://www.sciencedirect.com/science/article/abs/pii/S001670371000551X

Herwartz D., Nagel T.J., Münker C., Scherer E.E., Froitzheim N. (2011) Tracing two orogenic cycles in one eclogite sample by Lu-Hf garnet chronometry. Nature Geoscience 4, 178-183. https://www.nature.com/articles/ngeo1060

Cornelia Schäfer
Cornelia Schäfer
Dr. Mathias Müller
Dr. Mathias Müller
Dr. Alexander Pohle
Dr. Alexander Pohle
Dr. Kevin Stevens
Dr. Kevin Stevens
Fabian Zahnow
Dr. Fabian Zahnow

Dr. Fabian Zahnow

Fabian.Zahnow@rub.de

Scientist/Wissenschaftlicher Mitarbeiter
IA 5/185

Research interests: My research focuses is on triple oxygen isotope systematics of micrometeorites, cherts and sulfates. Using this tool, I aim at constraining paleohydrospheric and paleoatmospheric parameters. For this research I develop custom made analytical techniques to achieve the required precision.

Forschungsinteressen: In meiner Forschung messe ich Drei-O Isotope an Mikrometeoriten, Cherts und Sulfaten. Mit diesem Werkzeug rekonstruiere ich Paläohydrologische und Paläoatmosphärische parameter. Dafür entwickele ich neue analytische Ansätze um die nötige Genauigkeit zu erreichen. 

Dings Feng
Dr. Dingsu Feng

Dr. Dingsu Feng

Dingsu.Feng@rub.de

Scientist/Wissenschaftliche Mitarbeiterin
IA 5/185

Research interests: My research focuses on triple oxygen isotope systematics of phosphates, mainly fossil bones and teeth. Animals inhale air oxygen with a 17-O anomaly, that is first transferred to body water and then biogenic apatite. Thus, fossil tooth enamel serves as a time capsule for the 17-O anomaly of ancient air O2, which can be used to estimate paleo-pCO2 and/or gross primary productivity. 

Forschungsinteressen: Ich befasse mich in meiner Forschung mit der Drei-O Isotopensystematik von Phosphaten, insbesondere von fossilen Knochen und Zähnen. Tiere atmen Luftsauerstoff mit einer 17-O Anomalie ein, welche zunächst auf das Körperwasser und dann auf den biogenen Apatit übertragen wird. Fossiler Zahnschmelz dient so als Zeitkapsel für die 17-O Anomalie in Paläo-Luft O2, was als proxy für pCO2 und/oder Bioproduktivität genutzt werden kann.  

Dr. Borhan Bagherpour
Dr. Borhan Bagherpour

Dr. Borhan Bagherpour

Scientist/Wissenschaftlicher Mitarbeiter
IA 5/185

Borhan.Bagherpour@rub.de

Research interests: My research focusses on the Permian/Triassic mass extinction. By combining field work, classic Sedimentology, geochronology, geochemistry and stable isotopes, I aim at reconstructing the evolution of paleoenvironments during this critical time interval.

Forschungsinteressen: Ich befasse ich mich wissenschaftlich vornehmlich mit der Perm/Trias Grenze. Anhand der Kombination von Feldarbeit, klassischer Sedimentologie, Geochronologie, Geochemie und stabilen Isotopen zielt meine Forschung darauf ab die Evolution der Paläoumwelt in dieser kritische Zeitspanne zu rekonstruieren.   

Christine Zhong
Christine Zhong
Manfred
Manfred Heinelt
Felix Jagert
Felix Jagert
Vivien Folliot
Vivien Folliot
Max
Max Berndsen
Pascal Hambsch
Pascal Hambsch
Oskar Schramm
Oskar Schramm

Oskar Schramm

PhD/Doktorand (Herwartz/Riechelmann/Immenhauser)
IA 5/185

Oskar.Schramm@rub.de

Research interests: Triple oxygen isotope systematics in cherts and in carbonates, heatflow, kinetic isotope effects in carbonates, that form due to CO2 degassing (e. g. speleothems, cryogenic carbonates, travertine), carbonate mineralogy.

Forschungsinteressen: Drei-O Isotopensystematik in Cherts und Karbonaten, Heatflow, kinetische Isotopeneffekte in Karbonaten die im Zusammenhang mit CO2 Entgasung entstehen (z. B. Tropfsteine, Cryogene Karbonate, Travertin), Mineralogie von Karbonaten.

Jonas Schrodt
Jonas Schrodt

Jonas Schrodt

PhD/Doktorand (Herwartz/Predel)
IA 5/185

Jonas.Schrodt@rub.de

Research interests: Insects are observed in dry Deserts. They are the only animals that can survive under the fierce water limiting conditions of fog-free zones within the hyperarid core of the Atacama Desert. Using a stable isotope approach, I aim to unravel, where these organisms get their water from.

Forschungsinteressen: Insekten leben in trockenen Wüsten. Sie sind die einzigen Tiere die selbst in den nebelfreien Regionen im hyperariden Kern der Atacama in Chile vorkommen. Anhand von stabilen Isotopen möchte ich die Wasserquellen dieser Tiere quantitativ bestimmen.

Dr. Sylvia Riechelmann
Dr. Sylvia Riechelmann
Kathrin Delli Carri
Kathrin Delli Carri
Anastasija-Elaine Drese-Holstein
Anastasija-Elaine Drese-Holstein
Hoffmann-Photo
Dr. René Hoffmann
Sabine Weisel

Sabine Weisel

E-mail: sabine.weisel@rub.de

Operator/Technische Angestellte

IB 02/163
Tel: +49-234-32-24136

Mikroanalytical laboratory, REM CL EMP