Lowenstern, J.B. and Janik, C.J., 2003, The origins of reservoir liquids and vapors from The Geysers geothermal field, California, In: Simmons, S.F. & Graham, I.J. (eds) Volcanic, geothermal and ore-forming fluids: Rulers and witnesses of processes within the Earth. Society of Economic Geologists Special Publication 10, p. 181-195. Click here for a preprint.
USGS Open-File Report 99-304 is a 28 page report (PDF format) with data for 81 steam samples from wells in The Geysers geothermal field. These gas geochemistry analyses represent gases sampled from 1978 through 1991. The file is 3.1 MBytes in size.
Shorter summary of above, entitled: A new compilation of gas and steam analyses from The Geysers geothermal field, California, USA. The article was published in the 1999 Transactions of the New Zealand Geothermal Workshop. This 6-page PDF file is 1.1 MByte in size. The entire reference is:
Lowenstern, Jacob B., Janik, Cathy J., Fahlquist, Lynne S., and Johnson, Linda S., 1999, A new compilation of gas and steam analyses from The Geysers geothermal field, California, USA. Proceedings 21st New Zealand Geothermal Workshop, 55-60.