MARGINS TEI: Inside the Subduction Factory. Eugene, Oregon, January 2000.

Proposal for MARGINS Theoretical and Experimental Institute: Inside the Subduction Factory

"MARGINS Theoretical and Experimental Institute: Inside the Subduction Factory," written by Marc Hirschmann, Terry Plank, and Brian Taylor.

View the list of participants here.

Lecture Notes (Eugene)

The lecture outlines of the short course "MARGINS Theorectical and Experimental Institute: Inside the Subduction Factory" can be downloaded as a PDF document. The abstracts with figures are also available for most lectures.

Please download the documents, print them out, and be prepared!

TEI Outlines

Abstracts and figures are in alphabetical order by author:

Three Tectono-Magmatic Systems Interact in Central America

Michael Carr

Please download the SubFac abstract from Michael Carr.


Slab Geochemical Tracers

Tim Elliot

Please download the SubFac abstract from Tim Elliot.


Izu-Bonin-Marianas (IBM) focus region

Matthew J. Fouch

Please download the SubFac references from Matthew J. Fouch.


Melt Generation in the Mantle Wedge

Glenn Gaetani

Please download the SubFac abstract from Glenn Gaetani and his list of references.


Basic principles of electromagnetic and seismological investigation of shallow subduction zone structure

George Helffrich

Please download the SubFac abstract from George Helffrich.


The Rheology of the Mantle Wedge

Greg Hirth

Please download the SubFac abstract from Greg Hirth.


Experimental Constraints on Slab Mineralogy and Dehydration

John R. Holloway

Please download the SubFac abstract from John R. Holloway.


Mapping the Water Content in the Mantle from Seismological Measurements

Shun-ichiro Karato

Please download the SubFac abstract from Sun-ichiro Karato.


Crustal Structure of the Mariana Subduction Factory

Simon Klemperer

Please download the SubFac abstract from Simon Klemperer. You can also download his second talk about "Multi-scale Seismic Imaging of the Mariana Subduction Factory" as a pdf document.

Figure 1-3 (Klemperer) Download this figure as a pdf file.

Figure 4 (Klemperer)Download this figure as a pdf file.

Figure proposal Download this figure as a pdf file.


IBM vs. AleutiansComparison IBM versus Aleutian.

Please download the figure from Simon Klemperer as a pdf document.




Thermal Structure and Metamorphic Evolution of Subducting Slabs

Simon M. Peacock

Please download the SubFac abstract from Simon M. Peacock.


The Izu-Bonin-Mariana Subduction Factory

Robert J. Stern

Please download the SubFac abstract from Robert J. Stern. Here are also his 7 figures that are include in the abstract (only in B&W). Each figure is also available in color as a PDF document.


Fig.1 (Stern)Fig. 1: IBM arc system, showing extent of crust generated over the 48 Ma life of the arc (fossil plus active) as well as those components which comprise the presently active IBM Subduction Factory. Also shown is the location of the deepest place on the face of the earth, the Challenger Deep (~11km deep) and the IBM collision zone

Download Fig. 1 in color as PDF document.



Fig. 2 (Stern)Fig. 2: Seafloor feeding into the IBM Subduction Factory, modified after [31]. Arrows are relative velocities of the Pacific Plate with respect to the Philippine Sea Plate, in mm/a, after [1]. DSDP and ODP sites sampling units being subducted beneath IBM are shown as well. Note that the sedimentary section being subducted beneath northern IBM has fewer volcanics and volcaniclastics than that being subducted beneath the southern IBM.

Download Fig. 2 in color as PDF document




Fig. 3 (Stern)Fig. 3: Obliquity of convergence between the Pacific and Philippine Sea plates, as inferred from earthquake slip vectors and modified after [32]. Note that convergence is highly oblique over much of the IBM arc system.

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Fig. 4 (Stern)Fig. 4: Generalized topology of IBM Wadati-Benioff Zone, modified after [33]. Two perspectives are shown, with contours colored at every 100 km depth.

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Fig. 5 (Stern)Fig. 5: Structure of IBM arc crust at 32151N, modified after [15]. Vertical exaggeration is about 10x. Note the crustal thickness of 22km is nearly four times that of oceanic crust but only about half that of normal continental crust.

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Fig. 6 (Stern)Fig. 6: Along-strike profiles of the IBM arc system, from Japan (left) to Guam (right). The thick solid line shows the bathymetry and topography along the volcanic axis of the active arc, with the thin dashed horizontal line marking sea level. The approximate locations of the principal island groups (Izu, Bonin-Volcano, and Mariana) are shown. Submarine volcanoes (and the Sofugan Tectonic Line, STL) are given as italicized abbreviations: Ku, Kurose;Ms, Myojin-sho; Do, Doyo; Kk, Kaikata; Kt, Kaitoku;F, Fukutoku-oka-no-ba; HC, Hiyoshi Volcanic Complex, Nk, Nikko; Fj, Fukujin, Ch, Chamorro, D, Diamante; R, Ruby, E, Esmeralda; T; Tracy. Subaerial volcanoes are given as normal abbreviations: O, Oshima; My, Miyakejima; Mi, Mikurajima; H, Hachijojima; A, Aogashima; Su, Sumisujima, T, Torishima; Sg, Sofugan; Nishinoshima; KIJ, Kita Iwo Jima; IJ, Iwo Jima; MIJ, Minami Iwo Jima; U, Uracas; M, Maug; As, Asuncion; Ag, Agrigan; P, Pagan; Al, Alamagan; G; Guguan; S, Sarigan; An, Anatahan. Dominant compositions of arc segments are also indicated. Locations of important zones of intra-arc and back-arc extension in the north (Bonin Arc Rifted Zone) and south (Mariana Trough Back-Arc Basin) are marked. The thick dashed line shows the maximum depth in the trench along its strike. Frontal arc elements are not shown, but consist of the Bonin or Ogasawara Islands between 26 and 28N and the Mariana frontal arc islands between 13 and 16N. ICZ = IBM collision zone.

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Fig. 7 (Stern)Fig. 7: Spider1 diagram for Mariana arc lavas. Elements are listed in order of increasing compatibility in mantle minerals; data for typical Maraian arc lavas is from [34]. Notice strong enrichments in LIL and depletions in HFSC, including Nb and Ta.

Download Fig. 7 in color as PDF document


Seismological Constraints on Structure and Flow Patterns Within the Mantle Wedge

Douglas Wiens

Please download the SubFac abstract from Douglas Wiens. The abstract includes the color figures below.


Fig. 1 (Wiens)Fig 1. East west vertical cross-section of a P-wave tomographic image of the Tonga Subduction Zone and Lau Backarc Basin from Zhao et al., [1997]. The image was determined by inversion of ~41,000 P-wave arrival times from 926 earthquakes recorded by portable land seismic stations, ocean bottom seismographs, and teleseismic stations. Red and blue colors denote slow and fast velocities, respectively, and the velocity perturbation scale is shown at the bottom.


Fig. 2 (Wiens)Fig 2. Shear wave splitting observations from land seismic stations and ocean bottom seismographs in the Tonga-Fiji region. Each red arrow represents the average fast splitting direction at a particular station, with the length indicating the magnitude of the splitting delay time. Black lines denote spreading center and transform fault orientations.


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