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Weimin Feng, Ph.D curriculum vitae

Research interests |  Publications | Photos | VSU email
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Address:
          Nevins Hall 2067
          Department of Physics, Astronomy and Geosciences
          Valdosta State University , Valdosta, GA, 31698
          wfeng@valdosta.edu
          214-714-7264 (C)
          229-333-7030 (O)

Appointment:
         
2011-present, Assistent professor, geochemistry, Valdosta State University, Valdosta, GA
          2009-2011, PostDoc, the University of Texas at Austin , Austin, TX

Education
:
          PhD. (2009) Southern Methodist University . in Geochemistry. Advisor: Dr. Crayton. J. Yapp
          MS. (2003) University of Science and Technology of China . Advisor: Dr. Yong-Fei Zheng
          BS. (2001) University of Science and Technology of China . in Geochemistry.

Course taught:
         
GEOG1113, Introduction to Landforms
          GEOG1110, Our Hazardous Environment

Current Memberships
:
          American Geophysical Union
          Geochemical Society
          Geological Society of America

Research Interests       (to top)
 
        Paleoclimate records are foundation for our understanding of the climate system, and ultimate touchstone for regional and global climate models. There have been many paleoclimate records derived from geochemical compositions of marine strata, in contrast, terrestrial paleoclimate records are lacking in both quality and quantity. My research aims to acquire new terrestrial paleoclimate records, develop new paleoclimate proxies, and calibrate existing ones.  I use isotope tools to study materials formed in the low-temperature, near surface environments such as paleosols and speleothems .

Fig. Using stable oxygen and hydrogen isotopes of kaolinite in paleosols to infer mid-Cretaceous temperatures (Feng and Yapp, 2009)

        To improve the quality of the terrestrial paleoclimate records, my research attempts to calibrate the relationship between the proxy data and climate conditions by analyzing naturally occurred and synthetic materials. Current, I’m interested establishing the concentration and isotopic relationship between CO2 in the gibbsite structure and those in the ambient environment, and in delineating the impact of various climate and kinetic factors on the stable isotopic fractionations between speleothems calcite and drip water.

Publications           (to top)

Published Papers
  1. Feng, W., Casteel, R.C., Banner, J., and Ayla Heinze-Fry (2014) Oxygen isotope variations in rainfall, drip-water and speleothem calcite from a well ventilated cave in Texas, USA: Assessing a new speleothem temperature proxy Geochimica, Cosmochimica, Acta. Vol. 127, 233-250 [doi ] [pdf ]

  2. Feng, W., Banner, J., Guilfoyle, A., Musgrove, M., and James, E.W. (2012) Oxygen isotopic fractionation between drip water and speleothem calcite: A 10-year monitoring study, central Texas, USA. Chemical Geology. Vol. 304-305, 53-67 [doi ] [pdf ]

  3. Feng, W., and Yapp, C.J. (2009) 18O/16O and D/H Ratios of Pedogenic Kaolinite in a North American Cenomanian Laterite: Paleoclimatic Implications. Geochimica et Cosmochimica Acta Vol. 73, 6249-6263 [doi ] [pdf ]

  4. Feng, W., and Yapp, C.J. (2009) Paleoenvironmental Implications Of Concentration And 13C/12C Ratios Of Fe(CO3)OH In Goethite From A Mid-Latitude Cenomanian Laterite In Southwestern Minnesota. Geochimica et Cosmochimica Acta Vol. 73, 2559-2580 [doi ] [pdf ]

  5. Feng, W., and Yapp, C.J. (2008) Experimental Tests of the Effects of Al Substitution on the Goethite-Water D/H Fractionation Factor. Geochimica et Cosmochimica Acta Vol. 72, 1295-1311 [doi ] [pdf ]

  6. Feng, W., Zheng, Y-F., Zhou, J. B. (2003) Carbon and oxygen isotope geochemistry of marbles from the Dabie-Sulu orogenic belt. Acta Petrologica Sinica (in Chinese), Vol.19 No.3, 468-478 [pdf ]

Paper In Preparation/review
  1. Feng W., Banner J., Musgrove, M, and James E., (2011) Seasonal 13C/12C Variations of speleothem calcite and implications for paleoclimatic studies from a 10 year monitoring study from central Texas, USA, to be submitted to 
Published Abstracts
  1. Breecker, D O., Meyer, K, Feng, W., Banner, J L., and Carlson, P E. (2013) Vegetation and climate signals in the carbon isotope compositions of speleothem calcite. Geological Society of America Abstracts with Programs,.Vol. 45, No. 7, p. 421

  2. Feng, W., Hardt, B., Banner, J., Meyer, K., Musgrove, M., James, E.W., Edwards, R., Cheng, H. (2012) invited. Changing amounts and sources of moisture to the U.S. southwest in response to global climate change Eos Trans. AGU, 92, Fall Meet. Suppl., . Abstract PP44A-06

  3. Childree, K.P., Feng, W., and Thieme, D. (2012) Concentrations and δ13C values of atmospheric CO2 in a less-urbanized environment: Are they different from large metropolitan areas Eos Trans. AGU, 92, Fall Meet. Suppl.. Abstract A53N-0364

  4. Meyer, K., Feng, W., Breecker, D.O., Banner, J.L., Guilfoyle, A., (2012). New insights into the carbon isotope composition of speleothem calcite from vegetation, soil, and subsurface processes Eos Trans. AGU, 92, Fall Meet. Suppl. Abstract B13A-0460

  5. Banner, J.L., James, E.W., Breecker, D., Casteel, R., Wong, C., Meyer, K., Feng, W., and Cowan, B. (2012) Long-term cave monitoring on the Edwards Plateau of Texas (USA) to advance speleothem paleoclimate proxies. Geophysical Research Abstracts, Vol. 14. EGU 2012-13481-1 [pdf ]

  6. Heinze Fry, A., Feng, W., Banner, J., and Casteel, R. (2011) Oxygen isotope relationships between rainfall, dripwater and speleothem calcite from Westcave, central Texas, USA: Possible implications for paleoclimate study. Eos Trans. AGU, 92, Fall Meet. Suppl., PP31C-1877 [pdf ]

  7. Meyer, K., Feng, W., Banner, J., James, E.W., and Musgrove, M. Southwest U.S. (2011) Paleoclimate Over the Past 30,000 Years: Insights from Speleothem δ18O and Growth Rate Time Series Eos Trans. AGU, 92, Fall Meet. Suppl., PP31C-1872. [pdf ]

  8. Wong, C., Banner, J., Casteel, R., Feng, W., James, E. (2011) Potential and challenges for speleothems as paleoclimate archives. Carbonate Geochemistry: Reactions and processes in aquifers and reservoirs, A conference by the Karst Waters Institute.

  9. Casteel, R., Banner, J., Wong, C., Feng, W., and James, E. (2011) Implications for speleothem paleoclimate records from twelve years of cave monitoring studies in Texas, USA, 6th International Conference: Climate Change - The Karst Record

  10. Feng, W., Banner, J., Musgrove, M. Guilfoyle, A., James, E. (2010)  Mechanisms of oxygen isotopic fractionation between drip water and speleothem calcite: Evidence from a 10 year monitoring study, central Texas, USA Geological Society of America Abstracts with Programs, Vol., p

  11. Feng, W., and Yapp, C.J. (2009) Concentration And δ13C Values of Occluded CO2 in Coexisting Gibbsite and Goethite of a Cenomanian Paleosol Eos Trans. AGU, 90(52), Fall Meet. Suppl., Abstract PP13B-1392 [pdf ]

  12. Feng, W., Banner, J and Musgrove, M. (2009) U-series geochronology of speleothems across the Edwards Plateau and implications for regional paleoclimate during the late Pleistocene-Holocene in Texas. Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 471

  13. Feng, W., and Yapp, C.J. (2008) Paleoenvironmental Implications of Carbon and Hydrogen Isotopes in Minerals from a Mid-Latitude Cenomanian Laterite, Eos Trans. AGU, 89(23), Jt. Assem. Suppl., Abstract PP21A-06

  14. Feng, W., and Yapp, C.J. (2008) Possible Implications of Variations of Carbon Dioxide Concentration and 13C/12C In a Mid-Cretaceous Paleosol as Estimated from the Fe(CO3)OH Component of Goethite. Geological Society of America Abstracts with Programs, Vol. 40

  15. Feng, W., and Yapp, C.J. (2007) Concentration And Carbon Isotope Composition of Fe(CO3)OH in Pedogenic Goethite Of A Mid-Cretaceous Paleosol in Southwestern Minnesota, Geological Society of America Abstracts with Programs, Vol. 39, No. 6, p. 14

  16. Feng, W., and Yapp, C.J. (2006) Experimental Tests of the Effects of Al Substitution on the Goethite-Water D/H Fractionation Factor. Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 532

  17. Zheng, Y-F., Gong, B., Li, L., Feng W., (2002) A Large Scale Of Meteoric-Hydrothermal Alteration At Neoproterozoic In The Yangtze Craton Of China. Geochimica et Cosmochimica Acta Vol. 66, A874

Photos             (to top)

community dog  yellowstone mammath hot spring

field trip to N GA  with students