October Dinner Meeting – 2017

Speaker: Jahn’s Distinguised Lecturer – Scott Anderson

 




September Dinner Meeting – 2017

Speaker: Aaron Schlessinger

Topic: Pavement Enhancement with High Performance Geogrids




August Dinner Meeting

Speaker: Kelin X. Whipple, Professor, ASU SESE




July Dinner Meeting

Speaker: John Rockhill

John D. Rockhill is an archaeologist with Amec Foster Wheeler in Phoenix, Arizona with 20 years of field and laboratory experience in the southwestern United States, Egypt and Sudan. John was born and raised in Safford, Arizona and received his Bachelor of Science degree in Biology in 1975 from the U.S. Air Force Institute through the University of South Carolina. John has worked on and directed a number of field projects with emphasis on large scale survey, mapping and excavation of prehistoric and historic sites and their features and the laboratory analysis of lithic, glass and metal artifacts.

 




Student Networking Night – ASU

Please join the Phoenix Chapter of the Association of Environmental and Engineering Geologists (AEG), the American Institute of Professional Geologists (AIPG), and the Arizona Hydrological Society (AHS) at the 11th Annual Arizona AEG student night on March 30, 2017. This year at Student Networking Night we will pair students and professionals for mock-interviews for the students and lightning talks by professionals. This is an opportunity for students to learn how diverse the geologic field is and what varying aspects are available as a professional. This is also a night for professionals to meet students and learn what they are studying and what they hope to do once they graduate.

 

The event will begin at 6:00 pm and will be held in the La Paz Room of the Student Memorial Union on the Tempe campus of Arizona State University. For directions, please refer to the accompanying map of the ASU Campus and Student Memorial Union, or visit http://www.asu.edu/map/interactive/.




February Dinner Meeting – 2017

Speaker: Mostafa Khoshmanesh, ASU SESE PhD Student

Topic: Insights into fault behavior and underlying processes from geodesy, seismology, and geology

Geodetic techniques, measuring the ground surface movements at sub-millimeter precision, provide the seismotectonics community with an imperative opportunity to study faulting behavior at unprecedented details. Provided by these observations, we are now aware that part of the tectonic stress is released through aseismic slip or creep. The spatial extent and rate of creep determines the fault earthquake potential. Also, the temporal variation of creep rate, so-called Slow Slip Events (SSE) are capable of triggering major earthquakes. Kinematic models developed to integrate seismic and geodetic observations, allow resolving the spatiotemporal distribution of creep on the fault surface, disregarding the underlying mechanism. Focusing on the Central San Andreas Fault (CSAF) as my primary study area, in this presentation I will explain the methods that I developed to study spatial and temporal evolution of fault creep. My results show that creep rate on CSAF is not steady and episodic SSEs are observed on the entire seismogenic depth in a semi-periodic manner. I will briefly discuss the possible underlying mechanisms to explain the observed SSEs. I conclude that transient elevation of water pressure trapped in intergranular pore spaces, due to compaction of material within the fault zone is a feasible mechanism for initiating SSEs on the CSAF. I will also provide evidence for the link between SSEs on the CSAF and earthquakes on neighboring locked zones, including the 2004 Mw6.0 Parkfield earthquake. Studies of this kind can greatly improve the probabilistic earthquake forecasts models by considering the periodicity of these SSEs over the conventional assumption of constant loading rate.

 

Speaker Bio:

Mostafa Khoshmanesh is a PhD candidate in the School of Earth and Space Exploration at Arizona State University. He received his BA in surveying engineering in 2010 and MS in Geodesy in 2013, both from Iran. Since the beginning of his PhD in geological science in 2014, he has been a research assistant in Remote Sensing and Tectonic Geodesy Laboratory at ASU. His main area of interest is tectonic geodesy, with concentration on studying seismic and aseismic faulting processes. For this purpose he uses advanced Interferometric Synthetic Aperture Radar (InSAR) methods, combined with other geodetic, seismic, and geologic data set. His recent research on the time-dependent model of creep along the Central San Andreas Fault in California, has been published in high ranked Journal of Geophysical Research and is one of the most accessed articles in 2015.

 




June Dinner Meeting

Speaker: Enamul Hoque




May Dinner Meeting

Speaker: Shay Carter




April Dinner Meeting

Please join us on April 20 at McFate Brewing Company.

Our speaker will be Dr. Jan Rasmussen presenting on Wulfenite in Arizona.

Abstract:

‘Wulfenite in Arizona’ by Jan Rasmussen

Arizona is famous for its spectacular wulfenite specimens, such as the butterscotch-colored, bladed crystals from the Glove Mine south of Tucson. A recent bill in the Arizona legislature has designated wulfenite to be the state mineral.

 

Wulfenite (lead molybdate) forms in the oxidized zones of lead-zinc-silver deposits during later periods of alteration. The best large samples of wulfenite are associated with Laramide (~75 Ma), Jurassic (~190 Ma), or mid-Tertiary (~25 Ma) lead deposits where there are permeable fault zones with open space, open channelways, or caves. Microscopic specimens of wulfenite are associated with the later stages of porphyry copper or other types of ore deposits in the lead-zinc zones. Surprisingly, wulfenite does not occur in the presence of molybdenite, but rather occurs in close proximity to cerussite (lead carbonate) that has been altered from galena.

 

Museum quality specimens of wulfenite occur at the Glove Mine in the northwestern Santa Rita Mountains of Laramide age and at the Silver Bill, Defiance, Mystery, and Tom Scott mines in the Turquoise district (Courtland-Gleeson area in Cochise County) of Jurassic age. Mid-Tertiary age wulfenite samples are found at the Red Cloud Mine in La Paz County, Rowley Mine in Maricopa County, Old Yuma Mine in the northern Tucson Mountains, and the Mammoth-St. Anthony Mine at Tiger, AZ north of San Manuel.

 

Biography:

Dr. Jan Rasmussen is a consulting geologist in Tucson, specializing in writing permitting documents, such as Aquifer Protection Permits and Mine Plan of Operations, for consulting companies, such as SRK Consulting and other clients. As a Registered Geologist in Arizona and a Qualified Person with registration from SME, Jan has written Canadian National Instrument 43-101 reports for mining clients. Jan’s work in economic geology has included exploration for metallic and industrial mineral resources and most recently research with MagmaChem Exploration into ultra-deep hydrocarbon resources in the North Sea for a Norwegian oil company.

Jan earned a Ph.D. in economic geology from the University of Arizona in 1993 and then worked for Woodward-Clyde as a geochemist/economic geologist on the Yucca Mountain project in Nevada. Jan’s work there was recently published in the 2015 Geological Society of Nevada symposium volume.

Jan’s most recent full time job was as Curator of the Arizona Mining and Mineral Museum in Phoenix from 2007 through 2010.  Jan received the SME Individual GEM award in 2010 for her work in educating children about the importance of mining in their lives. Her interest in wulfenite started with her early research into molybdenum in Arizona with the Arizona Bureau of Mines (now the Arizona Geological Survey).

Throughout her career, Jan has been committed to educating people about geology and has taught Physical, Historical, and Environmental Geology as adjunct faculty for the University of Arizona, Austin Community College, Cochise College, and Pima Community College.

Jan has coauthored 14 books or open file reports on Arizona geology and numerous articles, most of which are available as pdf files on her website www.janrasmussen.com. Jan has recently started a photographic website, www.MiningMineralMuseum.com  about the Arizona Mining and Mineral Museum as it was in 2010.

 

RSVP HERE!

 

 




January 2017 Dinner Meeting

GROUNDWATER RECHARGE – SITING, DESIGN, OPERATION, AND ENHANCEMENT by Geno Mammini, R.G.

Geno Mammini, R.G. is a senior project hydrogeologist at Clear Creek Associates with over 16 years of experience in hydrogeologic and environmental consulting.  Geno graduated with his Bachelor of Science degree in Geology from California State University – Sonoma in 2000.  Geno is a Registered Geologist in Arizona and Washington, and is the groundwater chair for the Tri-State Seminar, an annual event held in Las Vegas that focuses on educating water professionals.  Geno has managed the design and construction of numerous public supply wells, ASR wells, vadose zone injection wells, and groundwater recharge basins, and has also conducted studies to enhance performance of recharge facilities.

Groundwater recharge remains an important water resources management tool in the southwest.  However, with today’s economic conditions, public and private entities alike must get the greatest return possible for each recharge investment dollar.  That is why it is critical to properly locate, construct, and operate recharge facilities to maximize their capability to efficiently recharge groundwater, both in the short-term and over the long haul.  This presentation will review types of recharge technologies including vadose zone methods and direct injection systems, and will discuss factors that should be considered during each stage of the recharge project from siting through design and ultimately operation.  Case studies will be sited to support hydrogeologic and costing assumptions.

Thank you to our sponsor, Clear Creek Associates and Geo-Logic Associates:

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