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Universität Kiel Die Fakultäten Die Math.-Nat.-Fakultät Einrichtungen Institut für Geowissenschaften Metamorphe und Magmatische Petrologie
Forschungsprofil Mitarbeiter Prof. Dr. V. Schenk Dr. S. Brandt Dr. P. Appel Dr. R. Halama Publikationen Dr. P. Herms Dr. P. Raase Rauno Baese Julia Bial Emmanuel Kazimoto Shreya Karmakar Labore Projekte Lehre Exkursionen Publikationen
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Address:
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Institut für Geowissenschaften, Abteilung Mineralogie - Petrologie
(Institute of Earth Sciences, Mineralogy Dept.)
Universität Kiel
D-24098 Kiel, Germany
Phone: +49 (0)431 880 1911
Fax.: +49 (0)431 880 4457
E-Mail: rh@min.uni-kiel.de
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Lectures / Courses:
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Isotope geochemistry and geochronology (with Prof. K. Hoernle)
Practical on igneous and metamorphic rock identification
Magmatism on Earth (with Dr. T. Hansteen)
Seminar to field excursions: Scotland 2008, Western Alps 2009 (with Prof. V. Schenk)
Field excursion Germany 2011 (with Dr. P. Appel)
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Research interests:
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Geochemistry and petrology of igneous rocks
Volatiles and fluid-rock interaction in subduction-related rocks
Lithium and nitrogen stable isotope geochemistry
Carbonatites
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Work areas:
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Raspas Complex, Ecuador
Coastal Cordillera, Chile
Gardar Province, South Greenland
Oldoinyo Lengai, Tanzania
Tezhsar Complex, Armenia
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Working on:
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1) SFB 574: Volatiles and Fluids in Subduction Zones: Climate
Feedback and Trigger Mechanisms for Natural Disasters (cooperation
with T. John and G. Bebout)
One focus of this project is on the Raspas
complex (Ecuador), which represents an exhumed part of a subducted
slab. The complex comprises serpentinites, eclogites, blueschists and
high-pressure metapelites. A detailed Li isotopic characterization of
the slab material is carried out to improve our ability to track
recycled Li into the mantle. Moreover, light elements, such as Li, may
be used as tracers of fluid release and fluid flow. Further research
will include halogen chemistry to quantify the transfer of these
climate relevant elements into the atmosphere, and Sr-Nd-O isotope
analysis to constrain fluid sources responsible for metasomatic changes.
A second key aspect of this project is the use of nitrogen and N isotopes as
geochemical tracer in subduction zones. N is known to be a sensitive tracer of
sediment-derived material, and it can be used to trace fluid-rock interaction. We are
analyzing high-pressure and ultrahigh-pressure metamorphic rocks in order to
understand the processes that govern N isotope fractionation and N elemental
mobility during subduction, and to evaluate how much N with which isotopic
signature is subducted deep into the mantle.
2) The Li isotopic composition of carbonatites (cooperation with W.F. McDonough,
R. Rudnick, K. Bell, J. Keller, J. Klaudius)
Carbonatites derive
from intraplate mantle sources and provide a means of documenting
isotopic variations of the Earth's mantle through time. To investigate
the secular Li isotopic composition of the mantle, to test whether Li
isotopes document progressive recycling of material processed at or
near the Earth's surface into the mantle, and to constrain Li isotopic
fractionation as a function of igneous differentiation, Archean to
recent carbonatites and associated silicate rocks are analyzed.
3) Metasomatism in the sub-arc mantle (cooperation with
I.P. Savov, W.F. McDonough, R. Rudnick)
Convergent margin
magmas carry slab signatures, but it is not clear whether this
signature is transferred from slab to mantle wedge via an aquesous
fluid, a silicate melt, or a supercritical liquid, as the chemical
characteristics of arc volcanics can be explained by either
melt-mantle interaction or slab fluid additions. Our investigation
focuses on rare sub-arc mantle xenoliths from the Kamchatka arc, where
in situ trace element data as well as Sr and Li isotopic data will be
used to constrain the origin and significance of pyroxenite veins in
the mantle wedge.
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Cooperation Partners:
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- T. John - Universität Münster
- W.F. McDonough, R. Rudnick - University of Maryland, College Park, USA
- G. Bebout - Lehigh University, Bethlehem, USA
- J.S. Maloney, P.I. Nabelek - University of Missouri, Columbia, USA
- I.P. Savov - University of Leeds, UK
- K. Meliksetian - Armenian National Academy of Sciences, Yerevan, Armenia
- J. Keller, J. Klaudius - Universität Freiburg, Germany
- M.A.W. Marks, G. Markl - Universität Tübingen, Germany
- F.-Z. Teng - University of Arkansas, USA
- K. Bell - Carleton University, Ottawa, Canada
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