University of California, Davis
2016-2017 Distinguished Lecturer
Anatomy Of A Long-Lived Oceanic Arc: Synthesis Of Three IODP Expeditions In The Izu-Bonin-Marianas Arc

 (Click on the lecture title to view presentation)

This talk provides an overview of results from three closely related IODP expeditions carried out in se­quence in the Izu-Bonin-Mariana (IBM) arc system in 2014. It focuses on geologic results that are of interest to those working in magmatic arcs on continents as well as those in the sea. Expedition 350 was the first expedition to drill in the Izu rear arc; all previous IODP sites were drilled in or near the Izu-Bonin arc front or fore arc, leading to an incomplete view of Izu arc magmatism. Thus, the main objective of Expedition 350 was to reveal the history of “the missing half” of the subduction factory.

The second expedition (351) focused on IBM arc origins by drill­ing west of the Kyushu-Palau remnant arc ridge, where the foundation, origin, and early evolution of the IBM arc is recorded. The third expedition (352) ex­amined the processes of subduction initiation, by drilling the outer IBM fore arc. My talk will describe the Paleogene to Neogene evolution of the IBM arc system, and compare it with outcrop analogs, with the goal of constructing an Island Arc Crust Virtual Field Model.

Dr. Busby has spent her life as a University of California field geology professor, specializing in outcrop studies of arc and rift terranes. She had never been on an oceanographic expedition before she was offered the exciting position of Co-Chief Scientist on IBM Expedition 350.


03 November 2016 – University of Florida, Gainesville, FL
04 November 2016 – University of South Florida, Tampa, FL
15 November 2016 – San Francisco State University, San Francisco, CA
29 March 2017 – Lock Haven University of Pennsylvania, Lock Haven, PA
31 March 2017 – Ohio University, Athens, OH
04 April 2017 – Southern Illinois University, Carbondale, IL
06 April 2017 – University of Missouri- Kansas City, Kansas City, MO
20 April 2017 – West Virginia University, Morgantown, WV
29-30 April 2017 – Idaho State University, Pocatello, ID
17 May 2017 – Massachusetts Institute of Technology, Cambridge, MA