Resume - PhD in geochemistry, experience in trace and major elements, radiogenic Isotopes...

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Resume #86423

CONTACT INFORMATION:
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SPECIALTIES IN:
* Uranium, Thorium and Radium Isotopic disequilibria study on young volcanic rocks.
* Thermal Ionization Mass Spectrometry (TIMS), ICP-MS and XRF analytical machines.
* Chromatography Separation Chemistry, especially for U-Th-Ra-Sr-Rb-Nd-Sm-Pb elements, for isotopic study.
* Application of isotope methods (U-Th-Ra-Sr-Rb-Nd-Sm-Pb-Hf) and Major-trace element in Geochemistry.
* Mineralogy and petrology for silicate Earth materials
* Clean laboratory work, instrumentation and analysis.
* Geological and Geochemical mapping of igneous, sedimentary and metamorphic terrains.
* Technical writing and editing, research presentations, paper writing and teaching.

EDUCATION:

* B.Sc. Geology, Addis Ababa University, Addis Ababa, Ethiopia (1990)
* M.Sc. Geochemistry, University of the Ryukyus, Okinawa, Japan (2004)
* Ph.D. Geology and Geochemistry, Okayama University, Misasa, Japan (2007)
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WORK EXPERIENCE:

2008-present Researcher and Super Technician at the Analytical Planetary Chemistry division, the Pheasant Memorial Laboratory (PML) for geochemistry and Cosmochemistry, Institute for Study of Earth's Interior (ISEI), Okayama University, Japan. http://www.misasa.okayama-u.ac.jp/eng/

2007-2008 Adjunct Researcher at the Analytical Planetary Chemistry division, the Pheasant Memorial Laboratory (PML) for geochemistry and Cosmo chemistry, Institute for Study of Earth's Interior (ISEI), Okayama University, Japan.

2004-2007 Assistant Researcher at the Analytical Planetary Chemistry division, the Pheasant Memorial Laboratory (PML) for geochemistry and Cosmochemistry, Institute for Study of Earth's Interior (ISEI), Okayama University, Japan.

1997-2002 Geological Survey of Ethiopia (GSE). Senior geologist, Regional geological and geochemical mapping of metamorphic, volcanic and sedimentary terrains.

1990-1996 Geological Survey of Ethiopia (GSE). Geologist, working in mineral exploration of mainly Gold and base metals.
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MEMBERSHIP IN PROFESSIONAL SOCIETIES:
2004-present: American Geophysical Union (AGU)
2004-present: Geochemical Society (GC)
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RESEARCH EXPERIENCE

2004- Present: my research has largely concentrated on the application of short-lived, U-series isotopic disequilibria to constrain the time scales of magma formation, transport and differentiation in young volcanic rocks. This research concerns the processes of mantle melting and magma formation within the Earth and a crustal level magma chamber processes. I approach this through the analysis of U-series isotopic disequilibria as well as major and trace elemental concentrations and other radiogenic isotope ratios (Sr-Nd-Pb-Hf) in the volcanic rocks.

In addition to the above stated research project I and my colleagues have developed two new analytical methods:

(i) For precise and accurate 234U/238U and 230Th/232Th isotope measurement by MC-ICP-MS for the application of U-Th disequilibrium systematics, and

(ii) Precise measurement of 228Ra/226Ra for 226Ra determination employing total integration and simultaneous 228Th correction by multi-collector ICP-MS using multiple ion counters, which both are published in Journal of Analytical Atomic Spectrometry.

2002-2004: Geochemistry and geochronology of the Cenozoic mafic lavas from the southeastern Ethiopian rift (the East African Rift System): for the assessment of models on magma sources, plume-lithosphere interaction and plume evolution. For this study I applied major - trace elements, Sr-Nd-Pb isotopes, and K-Ar age dating data.

LIST OF PUBLICATIONS

Papers published

Makishima A., Chekol T. A., Nakamura E. (2008). Precise measurement of 228Ra/226Ra for 226Ra determination employing total integration and simultaneous 228Th correction by multicollector ICP-MS using multiple ion counters. Journal of Analytical Atomic Spectrometry, 2008, V. 23, pages 1102–1107.

Makishima A., Chekol T. A., Nakamura E. (2007). Accurate determination of 234U/238U and 230Th/232Th for U-Th disequilibria studies by MC-ICP-MS with simple bracketing Journal of Analytical Atomic Spectrometry, 2007, V. 22, pages1383-1389.

Paper under revision

Chekol T. A., Shinjo R., Tatsumi Y., and Itaya T. (2009). Geochemistry and geochronology of the mafic lavas from the southeastern Ethiopian rift (the East African Rift System): Assessment of models on magma sources, plume-lithosphere interaction and plume evolution. (Submitted to Journal of Geochemistry, Geophysics, and Geosystems (G3), AGU)

Chekol T. A., Katsura K., Yokoyama T., C. Sakaguchi, Nakamura E. (2009). Geochemical Evolution of shallow magma plumbing system in the last 240 years, and mantle melting processes beneath Hekla volcano, Iceland: Implication from 238U-230Th-226Ra isotopic disequilibrium and comprehensive geochemical study. (Manuscript to be submitted to Journal of Geophysical Research)

Papers in preparation

Chekol T. A., Katsura K., Yokoyama T., Nakamura E. (2008). Mantle melting processes beneath Hekla volcano, Iceland: Implication from 238U-230Th-226Ra isotopic disequilibrium. (Manuscript in preparations)

Abstracts published

1. Chekol T. A., Katsura K., Yokoyama T., C. Sakaguchi, Nakamura E. (2008). Geochemical Evolution of shallow magma plumbing system in the last 240 years beneath Hekla volcano, Iceland: Implication from 238U-230Th-226Ra isotopic disequilibrium and comprehensive geochemical study. Abstract No. DO3 p. 37, Misasa The 3rd COE-21 International Symposium "Origin, Evolution and Dynamics of the Earth", Japan.

2. A. Makishima, Y.-H. Lu, B. Nagender Nath, T. A. Chekol, & E. Nakamura (2008). Analysis of Hf, Os, Re, Pb, Th and U isotope ratios with smaller amounts using MC-ICP-MS, Abstract No. P62 p.168, Misasa The 3rd COE-21 International Symposium "Origin, Evolution and Dynamics of the Earth", Japan.

3. Chekol T. A., Katsura Kobayashi, Eizo Nakamura (2006). Preliminary U, Th and Ra isotopic investigation of Hekla volcano, Iceland. Abstract, No.P02. 2nd Misasa International Symposium 'The Evolution of Early Stage of Earth and Solar System', Japan.

4. Chekol T.A. and Ryuichi Shinjo (2005). Geochemistry and Geochronology of Cenozoic basalts in the southern Ethiopian Rift: Implication for magmatic evolution in the East African Rift System. Abstract, No. C22A, International Symposium MISASA "Origin, Evolution and Dynamics of the Earth", Japan.

5. Chekol T.A. and Ryuichi Shinjo (2004). Geochemistry of Cenozoic basalts in the
Southern Ethiopian Rift: Implication for magmatic evolution in the East African Rift System. Abstract No. J030 P001, Japan Earth and Planetary Science Joint Meeting, Tokyo.

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