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Sacramento State Faculty

Dr. Lisa Hammersley

Faculty Portrait

Contact Information

Name: Dr. Lisa Hammersley

Title: Interim Associate Dean, College of Natural Sciences and Mathematics

Office Location: Sequoia 334

Email: hammersley@csus.edu

Office Phone: (916) 278-4655

Mailing Address: Sacramento State University 6000 J Street Sacramento, CA 95819

Office Hours: By appointment

About me

I am a geochemist and igneous petrologist interested in the magmatic processes that occur beneath volcanoes. I have studied volcanic systems in Ecuador, Mexico, and Northern California.

I am deeply committed to broadening participation in STEM and currently serve as the Lead Project Director for CSU-LSAMP, an alliance of all 23 campuses of the CSU system, dedicated to providing support for underrepresented minorities in STEM disciplines. 

Click here for my full curriculum vitae.

Courses that I teach

  • GEOL 05: Geology of Mexico
  • GEOL 07: Natural Disasters
  • GEOL 10: Physical Geology
  • GEOL 10L: Physical Geology Lab
  • GEOL 100: Mineralogy
  • GEOL 125: Metallic Ore Deposits

Research Projects/Interests

I am interested in the evolution of magma as it travels from the source to the surface. In particular I am interested the process of magma mixing. I study the texture and geochemistry of lavas to understand the source of the magma and the magmatic processes invovled in its evolution. I have studied volcanic systems in Ecuador, Mexico, and northern California. 

I am also interested in the application of geological techniques to archeological studies. I have been working on stone griding tools from the Teotihuacan Valley, Mexico to identify the source of the materials and examine production and trade patterns.

Recent Projects:

  • Using diffusion profiles across host-mafic enclave interfaces in lavas from Clear Lake to understand the timescale of magma mixing
  • Field and textural studies of magma mixing processes at Chaos Crags, Lassen Volcanic National Park
  • Determining the cause of a large gap in the volcanic front of the Mexican Volcanic Belt
  • Tracing the fate of arsenic in weathered sulfides from Empire Mine
  • Sourcing of stone grinding tools from Teotihuacan Valley, Mexico
  • Using isotope geochemistry to understand the structure of the magmatic system at the Clear Lake volcanic field

Publications

Plummer, C., Carlson, D., and Hammersley, L., Physical Geology (16th Edition), McGrad-Hill, in production, expected publication date, January 2018.

Plummer, C., Carlson, D., and Hammersley, L., Physical Geology (15th Edition), McGraw-Hill, 2015.

Hammersley, L., Levine, R., Cornwell, K., Kusnick, J., & Hausback, B.P., 2012, The Geology of Mexico: A quantitative evaluation of a course deigned to increase the number of Hispanic students participating in the geosciences at California State University, Sacramento, Journal of Geoscience Education, 60, 189-198.

Plummer, C., Carlson, D., & Hammersley, L., Physical Geology (14th Edition), McGraw-Hill, 2012.

Blatter, D. & Hammersley, L., 2010, Impact of the Orozco Fracture Zone on the central Mexican Volcanic Belt, Journal of Volcanology and Geothermal Research, 197, 65-84

Plummer, C., Carlson, D., & Hammersley, L., Physical Geology (13th Edition), McGraw-Hill, 2009.

Carlson, D., Plummer, C., & Hammersley, L., Physical Geology, Earth Revealed (9th Edition), McGraw-Hill, 2010.

Hammersley, L. & DePaolo, D.J., 2006, Isotopic and geophysical constraints on the structure and evolution of the Clear Lake volcanic system. Journal of Volcanology and Geothermal Research, 153, 331-356

Abstracts

Hammersley, L., The California State University Louis Stokes Alliance for Minority Participation (CSU-LSAMP): A collaborative, comprehensive approach to broadening participation in STEM, American Geophysical Union Annual Fall Meeting, San Francisco, CA, December 2016.

Hammersley, L., & Campos, N., CSU-LSAMP: Strategies for maintaining a cohesive alliance and maximizing successful outcomes, Louis Stokes Midwest Center of Excellence Conference, Lisle, IL, October 2016.

Schmidt, E., Hammersley, L., & Clynne, M.A., Enclave compositions indicate multiple felsic components at Chaos Crags, Lassen Volcanic National Park, California, American Geophysical Union Annual Fall Meeting, San Francisco, December 2014.

Hammersley, L., The effectiveness of courses developed to recruit and retain minority students in the geology major at Sacramento State, American Geophysical Union Annual Fall Meeting, San Francisco, December 2014.

Hammersley, L., Jefferson, M., & Yamazaki, K., 2014, The CSU-LSAMP Bridge to the Doctorate program at Cal State LA: A structures approach to student development and advancement to Ph.D, Roadmap to Action: LSAMP Principles for Broadening Participation in STEM, Chicago, IL,  October  2014.

Campos, N. & Hammersley, L., 2014, CSU-LSAMP: Achieving success through combining collective goals and policies with campus-specific elements, Roadmap to Action: LSAMP Principles for Broadening Participation in STEM conference, Chicago, IL, October 2014.

Goode, C., & Hammersley, L., CSU-LSAMP International Research and Global Awareness Program, Roadmap to Action: LSAMP Principles for Broadening Participation in STEM, Chicago, IL,  October, 2014.

Blatter, D.L. & Hammersley, L., New constraints on the subduction of the Orozco fracture zone, Mexico. Goldschmidt Conference, Sacramento, CA, June  2014.

Alpers, C.N., Mitchell, V.L., Basta, N.T., Casteel, S.W., Foster, A.L., Blum, A.E., Kim, C.S., Myers, P., Burlak, T.L., and Hammersley, L., 2012, Evaluating the bioavailability, bioaccessibility, mineralogy, and speciation of arsenic in mine waste and soils. Empire Mine low-sulfide gold-quartz vein deposit, Nevada County, California,  U.S. Environmental Protection Agency Hardrock Mining Conference, Denver, CO, April  2012. 

Alpers, C.N., Burlak, T., Foster, A., Hammersley, L., and Petersen, E., 2011, Mineralogy and speciation of arsenic in weathered waste rock from the Empire mine low-sulfide gold-quartz vein deposit, California. Annual Meeting of the National Association of Abandoned Mine Land Programs, Squaw Valley, CA, October 2011.

Burlak, T., Alpers, C.N., Foster, A.L., Brown, A., Hammersley, L., & Peterson, E., Tracking the mineralogical fate of arsenic in weathered sulfides from the Empire Mine gold-quartz vein deposit by using microbeam analytical techniques, American Geophysical Union Annual Fall Meeting, San Francisco, CA, December 2010.

Hammersley, L. & Blatter, D.L., Impact of the Orozco Fracture Zone on the central Mexican Volcanic Belt, American Geophysical Union Annual Fall Meeting, San Francisco, CA, December 2009.

Hammersley, L. & Biskowski, M., Source characterization of stone grinding tools from the Teotihuacan Valley, Mexico,  Geological Society of America Joint Annual Meeting, Houston, TX, September 2008.

Hammersley, L., Kusnick, J., Cornwell, K. & Hausback, B., Attracting Hispanic students to the Geosciences through the development of introductory level Geology of Mexico and Mexico Field Trip courses and collaboration with minority-serving groups on campus, Geological Society of America Joint Annual Meeting, Houston, TX, September 2008.

Stout, C.M., Hammersley, L. & Clynne, M.A., Field measurements of mafic enclave population density at Chaos Crags, Lassen Volcanic National Park, CA and implications for magma mixing. Geological Society of America Cordilleran Section, Bellingham, WA, May 2007.

Blatter, D.L. & Hammersley, L., A gap in the central Mexican volcanic belt: A result of shallow subduction of the Orozca fracture zone? Geological Society of America, Backbone of the Americas - Patagonia to Alaska, Mendoza, Argentina, May 2006.

Hammersley, L. & DePaolo, D.J., Isotopic and geophysical constraints on the structure and evolution of the Clear Lake volcanic field, Geological Society of America Joint Annual Meeting, Denver, CO, November 2004.

Hammersley, L. & DePaolo, D.J., Oxygen Isotope Evidence for the Role of Crustal Contamination in the Evolution of the Chalupas Caldera System, Northern Andes, Ecuador, American Geophysical Union  Annual Fall Meeting, San Francisco, CA, December 2002.

Hammersley, L. & DePaolo, D.J., Two-stage AFC-FC model for the evolution of large-volume rhyolitic ignimbrites (LRI’s), American Geophysical Union Annual Fall Meeting, San Francisco, CA, December 2001.

Hammersley, Lisa., Feineman, Maureen D., Bryce, Julia G., and Carmichael, Ian S.E., A wet volcanic front in Mexico: The source of hydrous intermediate lavas, Geological Society of America Joint Annual Meeting, Boston, MA, November 2001.

Feineman M.D., Hammersley L., Bryce J.G. and Carmichael I.S.E.,  Compositional consequences of lawsonite breakdown in regions of warm subduction, Geological Society of America Joint Annual Meeting, Boston, MA, November 2001.

Hammersley, L., DePaolo, D.J. & Beate, B., Development of Large-Volume rhyolitic ignimbrites (LRI’s): Chalupas caldera, Ecuador, III South American Symposium on Isotope Geochemistry, Pucón, Chile, 2001.

Hammersley, L., DePaolo, D.J. & Beate, B., Chalupas Caldera, Ecuador: A study of the development of a large volume rhyolite system in the northern Andes, IAVCEI General Assembly, Bali, Indonesia, July, 2000.

Hammersley, L. & DePaolo, D.J., Magma recharge and crustal assimilation in the evolution of the Clear Lake volcanic field, CA: An isotopic study, Geological Society of America Joint Annual Meeting, Denver, CO, October 1999.

Professional Associations

  • American Geophysical Union
  • Geological Society of America
  • National Association of Geoscience Teachers
  • California Mineral Education Foundation

Eagle Lake

The sun sets over Eagle Lake, northern California

wild horses

Wild horses walk through early morning frost in the Chalupas caldera, Ecuador. Volcan Quilindana sits in the background.

Mexican Volcanic Belt cinder cones

A chain of cinder cones in the Mexican Volcanic Belt

Photomicrograph of a zoned plagioclase crystal from an andesite

Photomicrograph of a zoned plagioclase crystal from an andesite collected from the Chalupas caldera in Ecuador.