Izu Bonin – Mariana (IBM) forearc system

Fault- and fluid-systems subsequent to subduction initiation in the outer Izu-Bonin-Mariana fore arc and within supra subduction zone ophiolites

Proposal P 27982-N29 funded by the Austrian Science Fund (FWF); project start by Nov. 1st 2015.

Research is based on the Integrated Ocean Drilling Project (IODP) Expedition 352. International Ocean Discovery Program (IODP) Expedition 352 was designed to decode the earliest evolution of arc crust at the Izu-Bonin-Mariana (IBM) arc-trench system. The expedition was based on achieving a full volcanic stratigraphy for the IBM fore arc to provide a basis for determining the petrogenetic evolution of the magmas that immediately postdate subduction initiation. This in turn will allow testing hypotheses for the geodynamics of subduction initiation. A major task was to test the hypothesis that the fore-arc lithosphere created during subduction initiation is the birthplace of supra-subduction zone ophiolites. Drilling and monitoring the fore arc provided critical data for understanding these systems.

Main focus within this project will be the evaluation of fluid/rock interaction, and the geochemical processes (indicated by fluids and precipitations) active within the fore arc, the estimation of the post-magmatic structural and tectonic evolution, and comprehensive field studies within the Troodos ophiolite (Cyprus).

Methods for these studies comprise the petrological characterization of the fore-arc magmatic rocks by microscopic description of thin sections, fluid inclusion (FI) analysis by heating and cooling (microthermometry) and by Raman spectroscopy, analysis of stable isotope, Sr- and fluid mobile element isotope signatures of vein precipitates, investigation of mesoscale fabrics along drill core sections in order to elaborate and document the internal structure, and microstructural studies in order to establish the deformation conditions.

Christeson, G.L.; Morgan, S.; Kodaira, S.; Yamashita, M.; Almeev, R.R.; Michibayashi, K.; Sakuyama, T., Ferré, E.; Kurz, W.: Physical Properties and Seismic Structure of Izu-Bonin-Mariana Fore Arc Crust: Results from IODP Expedition 352 and Comparison with Oceanic Crust, G3: Geochemistry, Geophysics, Geosystems, an electronic journal of the earth sciences, 38, DOI: 10.1002/2016GC006638, 2016.   @Open Access

Reagan, M.K., Pearce, J.A., Petronotis, K., Almeev, R., Avery, A.A., Carvallo, C., Chapman, T., Christeson, G.L., Ferré, E.C., Godard, M., Heaton, D.E., Kirchenbaur, M., Kurz, W., Kutterolf, S., Li, H.Y., Li, Y., Michibayashi, K., Morgan, S., Nelson, W.R., Prytulak, J., Python, M., Robertson, A.H.F., Ryan, J.G., Sager, W.W., Sakuyama, T., Shervais, J.W., Shimizu, K.: Subduction Initiation and Ophiolite Crust: New Insights From IODP Drilling. International Geology Review, 59, 10.1080/00206814.2016.1276482. DOI: 10.1080/00206814.2016.1276482, 2017. @Green Open Access

Ryan, J.G., Shervais, J.W, Reagan, M.K., Li, H.Y., Heaton, D., Godard, M., Kirchenbaur, M., Whattam, S.A., Pearce, J.A., Chapman, T., Nelson, W., Prytulak, J., Simizu, K., Petronotis, K., Almeev, R., Avery, A., Carvallo, C., Christeson, G., Ferre, E., Kurz, W., Kutterolf, S., Michibayashi, K., Morgan, S., Python, M., Robertson, A., Sager, W., Sakuyama, T.: Application of a handheld X-ray fluorescence spectrometer for real-time, high-density quantitative analysis of drilled igneous rocks and sediments during IODP Expedition 352. Chemical Geology, 451, 55-66. DOI: http://dx.doi.org/10.1016/j.chemgeo.2017.01.007, 2017.

QUANDT, D., MICHEUZ, P., KURZ, W. & KRENN, K.: Microtextures and fluid inclusions from vein minerals hosted in the Pillow Lavas of the Troodos supra-subduction zone.- Lithosphere, 10, 566-578, https://doi.org/10.1130/L696.1., 2018. @Open Access

SHERVAIS, J.W., Reagan, M., Haugen, E., Almeev, R., Pearce, J., Prytulak, J., Ryan, J.G., Whattam, S., Godard, M., Chapman, T., Li, H., Kurz, W., Nelson, W.R., Heaton, D., Kirchenbaur, M., Shimizu, K., Sakuyama, T., and Vetter, S.K.: Magmatic Response to Subduction Initiation, Part I: Forearc basalts of the Izu-Bonin Arc from IODP Expedition 352, G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences, DOI: DOI: 10.1029/2018GC00773. 2019. @Open Access

KURZ, W., MICHEUZ, P., CHRISTESON, G., REAGAN, M., SHERVAIS, J.W., KUTTEROLF, S., KRENN, K., MICHIBAYASHI, K., & QUANDT, D.: Post‐magmatic tectonic evolution of the outer Izu‐Bonin forearc revealed by sediment basin structure and vein microstructure analysis: implications for a 15 Ma hiatus between Pacific Plate subduction initiation and forearc extension. G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences. DOI: 10.1029/2019GC008369, 2019. @Open Access

QUANDT, D., MICHEUZ, P., KURZ, W., KLUGE, T., BOCH, R., HIPPLER, D., KRENN, K., HAUZENBERGER, C.A.: Geochemistry of vein calcites hosted in the Troodos Pillow Lavas and their implications for the timing and physicochemical environment of fracturing, fluid circulation, and vein mineral growth. G3: Geochemistry, Geophysics, Geosystems: an electronic journal of the earth sciences. DOI: 10.1029/2019GC008369, 2019. @Open Access

Quandt, D., Micheuz, P., Kurz, W., Bernasconi, S. M., Hippler, D., Krenn, K., & Hauzenberger, C. A.: Geochemistry and microtextures of vein calcites pervading the Izu‐Bonin forearc and rear arc crust: new insights from IODP Expeditions 352 and 351. Geochemistry, Geophysics, Geosystems, 21, e2019GC008745. https://doi.org/10.1029/2019GC008745, 2020. @Open Access

Shervais, J. W., Reagan, M. K., Godard, M., Prytulak, J., Ryan, J. G., Pearce, J. A., et al.: Magmatic response to subduction initiation, Part II: Boninites and related rocks of the Izu- Bonin Arc from IOPD Expedition 352. Geochemistry, Geophysics, Geosystems, 22, e2020GC009093. https://doi.org/10.1029/2020GC009093, 2021. @Green Open Access

Quandt, D., Kurz, W., Micheuz, P.: Post‑magmatic fracturing, fluid flow, and vein mineralization in supra‑subduction zones: a comparative study on vein calcites from the Troodos ophiolite and the Izu–Bonin forearc and rear arc. International Journal of Earth Sciences, doi.org/10.1007/s00531-020-01978-7, 2021. @Open Access

https://iodp.tamu.edu/scienceops/expeditions/izu_bonin_forearc.html