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South Coast Geological Society


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Meeting Date: Monday, March 2nd
    - Social Hour Begins at 6:00PM

Location (Map Below): CSULB Chartroom

Speaker: Dr. Greg Holk

Topic: Faults as Superhighways of Fluid Flow through Earth’s Crust

Abstract:

Faults as Superhighways of Fluid Flow through Earth’s Crust

Speaker Information:

Dr. Holk is a stable isotope geochemist. He earned his Ph.D. from Caltech, where his dissertation defined the complex fluid regimes active during the tectonic and petrologic development of metamorphic core complexes. His research focuses on the circulation of aqueous fluids through Earth's crust and the profound effects such fluids have on the geologic evolution of our planet. Before joining CSULB in 2000, Dr. Holk worked for two years in the mineral deposits group at the Geological Survey of Canada, where he developed stable isotope and other geochemical methods employed by the mining companies for the exploration of volcanic-hosted massive sulfide deposits that formed by large-scale hydrothermal activity on the seafloor. In addition, Dr. Holk worked at Queen’s University for two years, where he taught geochemistry courses and continued his work developing geochemical methods for mineral exploration that includes the utilization of Pb isotopes in the search for uranium deposits hosted at the unconformities of some of the world's largest sedimentary basins (i.e., McArthur Basin, Australia). At CSULB Dr. Holk teaches Mineralogy, Metamorphic Petrology, Earth Systems and Global Change, and Stable Isotope Geochemistry and serves as graduate advisor. Through numerous NSF grants, Dr. Holk has built the stable isotope laboratory located in the Institute for Integrated Research in Materials, Environments, and Societies. Continuing research includes: (1) an investigation of the role of fluids in deformational processes at the brittle-ductile transition in fault zones, (2) regional-scale isotope studies of one of the largest hydrothermal systems in the geologic record at the Canadian Cordillera, (3) studies that quantify the dehydration process during low-to-mid-grade metamorphism at the Otago Schist, New Zealand and Orocopia Schist, Southern California, and (4) the delineation of magma sources in an extensional continental arc environment, the Coastal Batholith of Peru. Dr. Holk's talk will focus on fluid circulation through fault zones. Major crustal-scale fault zones and crustal heat distribution both play a major role to determine fluid pathways. To demonstrate the importance of fluids on the tectonic evolution of Earth’s crust, Dr. Holk will be presenting several case studies that showcase the interplay between crustal thermal evolution and these permeable zones.

Address: California State University, Long Beach 6049 E. 7th, Long Beach, CA

Meal: Regular or Vegetarian meals Complimentary tea and coffee will also be available

Cost: Members $30; Non-members $35; Students and Professors $15, $5 late fee for reservations made after 5pm the Friday prior to the meeting.


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