Goverdina A. M. de Leeuw

Education

Research Interests

Noble gas geochemistry - He, Ne and Ar systematics in basaltic glasses, furmaroles and geothermal spring waters released at mid ocean ridges, oceanic islands, and volcanic arcs

Magmatic degassing - changes in the volatile (CO₂ and noble gas) signature of magmas as a result of degassing

Publications

De Leeuw, G.A.M., Hilton, D.R., Fischer, T.P., Walker, J.A., 2007. The He-CO₂ isotope and relative abundance characteristics of geothermal fluids in El Salvador and Honduras: new constraints on volatile mass balance of the Central American Volcanic Arc, Earth and Planetary Science Letters 258, p 132-146

Shaw, A.M., Hilton, D.R., Fischer, T.P., Walker, J.A., De Leeuw, G.A.M., 2006. Helium isotope variations in mineral separates from Costa Rica and Nicaragua: Assessing crustal contributions, time-scale variations and diffusion-related mechanisms, Chemical Geology 230, p 124-139

Crossey, L.J., Fischer, T.P., Patchett, P.J., Karlstrom, K.E., Hilton, D.R., Newell, D.L., Huntoon, P., Reynolds, A.C., De Leeuw, G.A.M., 2005. Dissected hydrologic system at the Grand Canyon: interaction between deeply derived fluids and plateau aquifer waters in modern springs and travertine, Geology 34, p 25-28

Manuscripts in preparation

De Leeuw, G.A.M., Hilton, D.R., Güleç, N., Mutlu, H. He-C relationships in geothermal waters from the North Anatolian Fault Zone (NAFZ), Turkey

De Leeuw, G.A.M., Hilton, D.R., Murton, B.M., Taylor, R.N. The CO₂-He-Ne-Ar systematics of basaltic glasses from the Reykjanes Ridge

Abstracts

De Leeuw, G.A.M., Hilton, D.R., Murton, B.M., Taylor, R.N, 2006. Source mixing, degassing and crustal contamination of basaltic glasses along Reykjanes Ridge. Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract V23A-0599

Hilton, D.R., De Leeuw, G.A.M., Güleç, N., Mutlu, H., Füri, E., Kulongoski, J., Brown, K., Tyron, M., 2005, Recent helium isotope studies in seismically-acitve regions: results from the San Andreas Fault Zone, California and the North Anatolian Fault Zone, Turkey, 8th International Conference on Gas Geochemistry, Palermo and Milazzo, Italy, p 17

De Leeuw, G.A.M., Hilton, D.R., Fischer, T.P., Walker, J.A., 2005. Along and across-arc profiles in He-C systematics: new data from El Salvador and Honduras. Geochimica et Cosmochimica Acta 69 (10) A631-A631

Hilton, D.R., Fischer, T.P., Shaw, A.M., De Leeuw, G.A.M., Walker, J.A., 2005. The CO₂-He isotope and relative abundance systematics of the Central American arc. Geochimica et Cosmochimica Acta 69 (10) A630

Güleç, N., Hilton, D.R., De Leeuw, G.A.M., Mutlu, H., Süer, S., Çifter, C., 2005. Isotope composition of geothermal fluids along the North Anatolian Fault Zone: Spatial and temporal variations in relation to seismic activities. Proceedings of World Geothermal Congress 2005

De Leeuw, G.A.M., Hilton, D.R., Güleç, N., Mutlu, H., 2004. He-C relationships in geothermal waters from the North Anatolian Fault Zone (NAFZ), Turkey. Geochimica et Cosmochimica Acta 68 (11), A263

Hilton, D.R., Fischer, T.P., Shaw, A.M., De Leeuw, G.A.M., Walker, J.A., 2004. The CO₂-He isotope and relative abundance systematics of the Central American arc, Neogene-Quaternary continental margin volcanism - Proceedings of the GSA Penrose Conference at Metepec Puebla, Mexico 2004, p 34

Hilton, D.R., Fischer, T.P., Stimac, J.A., De Leeuw, G.A.M., 2004. The importance of source composition on the carbon output at the Luzon and Bicol arcs, the Philippines, IAVCEI Pucon, Chile

Hilton, D.R., Fischer, T.P., Stimac, J.A., De Leeuw, G.A.M., Villasenor, L.B., Abrigo, F. V., 2004. The influence of subducted sediment composition on the volcanic gas output at arcs: comparing the Luzon and Bicol arcs, the Philippines, AGU, Fall meeting

Burnett, B.J., Fischer, T.P., Sharp, Z.D., Hilton, D.R., De Leeuw, G.A.M., 2003. Volatile light hydrocarbon compositions of the Central American Arc and Yellowstone National Park, EOS Trans. AGU 84 p F1513

De Leeuw, G.A.M., Hilton, D.R., Shaw, A.M., Murton, B.M., Taylor., R.N., 2002. Testing binary mixing models for lavas erupted along the Reykjanes Ridge; insights from C-He relationships. Eos Trans. AGU, 83(47), Fall Meet. Suppl., Abstract V52A-1274

De Leeuw, G.A.M., Beintema, K.A., Wijbrans, J. R., White, S.H., 2001. Chemistry of Archaean gabbros intruding the Tabba Tabba shear zone, Pilbara, WA, 4IAS. AGSO, Record 2001/37, Perth, WA, pp. 143-145

Beintema, K.A., De Leeuw, G.A.M., White, S.H., Hein, K.A.A., 2001. The Tabba Tabba Shear Zone; a crustal scale structure in the Archaean Pilbara Craton, WA, 4IAS. AGSO, Record 2001/37, Perth, WA, pp. 285-287

Beintema, K.A., De Leeuw, G.A.M., White, S.H., Hein, K.A.A., 2001. The Tabba Tabba Shear Zone; a crustal scale shear zone separating the Archaean East and West Pilbara Terranes, Western Australia, VMSG Symposium, Utrecht, The Netherlands

Formal Presentations

Source mixing, degassing and crustal contamination of basaltic glasses along Reykjanes Ridge. Poster presentation at AGU fall meeting, San Francisco, December 2006

Along and across-arc profiles in He-C systematics: new data from El Salvador and Honduras. Oral presentation at the Goldschmidt Conference, Moscow, Idaho, May 2005

He-C relationships in geothermal waters from the North Anatolian Fault Zone (NAFZ), Turkey. Oral and poster presentation at the Goldschmidt Conference, Copenhagen, Denmark, July 2004

Testing binary mixing models for lavas erupted along the Reykjanes Ridge; insights from C-He relationships. Poster presentation at AGU fall meeting, San Francisco, December 2002

Workshop attendance

Myres workshop 'Heat, helium, hotspots, and whole mantle convection', 2004, La Jolla, CA

Socrates course 'Modern trends in fluid-phase petrology', 1998, Siena, Italy

Teaching Experience

Teaching assistant University of California San Diego,
Department of Earth Sciences

• Introduction to Mineralogy (spring 2005)
• The Oceans (fall 2002, 2003 & 2004)
• The Earth (winter 2002 & 2007)

Teaching assistant Vrije Universiteit Amsterdam,
Department of Earth Sciences

• Field excursion in Cyprus (May 2001)
• Field work in Spain (June 2001)

Other teaching experience
Instruction and supervision of new users on gas extraction lines, noble gas and stable isotope mass spectrometers (MAP 215, VG 5400, VG Prism) and electron microprobe (Cameca - MBX) at SIO, as well as instruction in data processing

Analytical Experience

Gas extraction and purification lines, noble gas mass spectrometer (MAP 215, VG 5400), stable isotope mass spectrometer (VG Prism), electron microprobe (Cameca - MBX), heating and cooling stage

Work Experience

• Research assistant in the Fluids and volatiles laboratory, SIO, UCSD (2001-2007)
• Research assistant in the Argon geochronology laboratory, VU, Amsterdam (Jan-Feb 2001)
• Responsible for editing and rewriting field guides for graduate courses in Cyprus and Spain, VU, Amsterdam (March-April 2001)

Awards

• Graduate student fellowship (research and teaching), SIO, 2001-2007
• SIO travel grant to Goldschmidt conference in Copenhagen, 2004, and AGU fall meeting in San Francisco, 2006
• Whole Earth Society grant for electron microprobe work on Central American phenocrysts, as well as re-activation of analytical equipment, SIO, 2003 & 2004
• Molengraaff-Fonds for field projects in the Archaean Pilbara Craton, Western Australia, 1999 & 2000

Membership of Professional Organizations

• Geochemical Society
• American Geophysical Union
• European Association for Geochemistry
• KNGMG (Royal Dutch Society of Geology and Mining)