Field Trips GSA219

Cosponsors: GSA Geochronology Division; GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division; GSA Structural Geology and Tectonics Division.
Leaders: Alan D. Chapman, Macalester College; Nancy Riggs; Mihai N. Ducea.

Trip Description

This one-day outing will showcase Late Oligocene to Quaternary volcanic rocks and entrained lower-crustal and mantle xenoliths of the Transition Zone between the Colorado Plateau and the Basin and Range, as these materials provide key constraints on the tectonic evolution of the region. Important themes to be examined include (1) the growth, tectonic displacement, and foundering of sub-orogenic plateau (i.e., Nevadaplano) root material; and (2) the interplay between deep crust/upper mantle processes, late Cenozoic magmatism, and metamorphic core complex development.

Primary Leader Email Address: chapman@macalester.edu

Key qualifications: I’ve been engaged in NSF-funded study of the xenolith localities to be visited since 2015. I have been leading professional (e.g., a GSA Cordilleran Section Meeting trip in 2016), teaching, and outreach field trips for over a decade. Phoenix, Arizona, is an ideal central location from which to run this trip. All locations to be visited are within 1.5 hours’ drive from Phoenix. Professional preparation and appointments: University of Minnesota, B.S., 2005; California Institute of Technology; Ph.D., 2011, University of Arizona; Postdoctoral Researcher 2011–2013 Stanford University; Postdoctoral Researcher 2013–2014 Missouri S&T; Asst. Prof. of Geology 2013–2015 Macalester College; Asst. Prof. of Geology 2015. Relevant experience: Completed two three-week field camps through the University of Minnesota (2004 and 2005); completed two months of Ph.D. geologic mapping in a mountainous region of southern California (2006–2010); taught several one-day classes on the local geology at the Wind Wolves Preserve, California (summer, 2008–fall, 2009); teaching assistant for four-day field mapping projects at Caltech (2007, 2008, 2009, and 2010), led four one-day field trips for Don Benito Elementary School students and teachers, grades 2–6, on the geology of Eaton Canyon in Altadena, California (summer, 2008–winter, 2010); teaching assistant for three-week field camp through University of Arizona (2012); taught Missouri University of Science & Technology three-week summer field camp (2013 and 2014); led a two-day field institute to the Salinian block (central coastal California) for the GeoPrisms ExTerra Group in fall, 2014; led a two-day GSA Cordilleran section field trip to the southern Sierra Nevada–Mojave Desert (2016); led “Camp Rocks,” a three-day 4H camp in the Black Hills of Yavapai County for 52 4th–7th grade attendees from Yuma, Pima, and Maricopa counties, Arizona (2017); led a one-day geology activity and a hike for 30 students from Capitol Hill elementary school, St. Paul, Minnesota (May 2018).

ABSTRACTS:

Ducea Mihai N. DRIP TECTONICS UNDER MAGMATIC ARCS.  Click to View 

Ducea Mihai N. ZIRCON PETROCHRONOLOGY: GRANITOID MELTING CONDITIONS AND CONTINENTAL EVOLUTION.  Click to View 

Triantafyllou Antoine, Hodel Florent, Berger Julien, Macouin Melina, Baele Jean-Marc, Mattielli Nadine, Monnier Christophe, Ducea Mihai N., Poujol Marc, Langlade Jessica and Trindade Ricardo I.F. THE BOU AZZER AND SIRWA OPHIOLITES (ANTI-ATLAS, MOROCCO): INSIGHT INTO POLYPHASED SUBDUCTION-ACCRETION DYNAMICS DURING NEOPROTEROZOIC TIMES.  Click to View 

Ryan Eden, Kurt Sundell, Barbara Carrapa, Mihai Ducea, Joel Saylor. ZIRCON U-PB–LU-HF PETROCHRONOLOGY OF THE LATE CENOZOIC CENTRAL ANDES OF SOUTHERN PERU.  Click to View 

Chapman Alan D., Rautela Ojashvi, Shields Jessie E., Ducea Mihai N. and Saleeby Jason B. FATE OF THE LOWER LITHOSPHERE DURING SHALLOW-ANGLE SUBDUCTION: THE LARAMIDE EXAMPLE.  Click to View