Geological Insights & Event News

The Dec. 3 meeting features Logan Powell of Metallic Minerals on the La Plata alkaline porphyry complex. Mr. Powell discusses how Farallon flat slab subduction relates to Arizona porphyry systems and alkaline magmatism, using new geochemistry from the Allard stock to illuminate this unusual igneous complex. Dr. Gonzales’ “Prez Sez” column examines the Oligocene (32–30 Ma) San Juan Formation volcanism, its thick strato-volcanic deposits, inherited zircons, paleo- valley infill, major unconformities, and evidence challenging a proposed La Plata stratovolcano.

November 2024 newsletter features Vince Matthews challenging Laramide age of Rocky Mountains, arguing for recent extensional formation. President David Gonzales explores Colorado mineral names including coloradoite, durangite, and ourayite. Foundation reports low donation rates seeking nine additional contributors by year end.

October 2024 newsletter features Peter Hennings on injection-induced earthquakes in Texas oil fields. President David Gonzales explores telluride minerals from La Plata Mountains field trip. Foundation emphasizes giving season fundraising. Newsletter includes field trip photos and upcoming dinosaur tracks excursion.

September 2024 newsletter features Dr. Kathy Cashman on Hawaiian lava flow emplacement processes from 1983-2018 observations. President David Gonzales examines Engineer Mountain's 16 million-year granite intrusion and glacial modification. Foundation reports summer field activities and ongoing fundraising initiatives.

FCGS welcomes members back with the Aug. 25 picnic at Junction Creek, featuring food, a raffle, and the Rob Blair Horseshoe Tournament. Fall events include field trips and a strong lineup of talks at FLC, beginning mid September with volcanologist Dr. Kathy Cashman, followed by October and November speakers. News notes highlight elections, dues reminders, and the successful Chama River Trip.

Hydrogeologist Douglas Bartlett will talk on the difficulty of finding an adequate groundwater supply for hard rock mines in the desert southwest. The FCG Foundation welcomes new director Peter Mesard. Chris Heine’s Prez Sez column examines the inherent conflict between definitions of sustainability from the environmental, social and economic viewpoints. The Field Trip Committee is preparing the local Chinle Fm. trip, and the Chama River float trip, while posting photos of the successful Harding pegmatite field trip. Proposed changes to the FCGS Bylaws are posted for your vote this month.