Proc. IODP, 324, Massive basalt flows on the southern flank of Tamu Massif, Shatsky Rise: a reappraisal of ODP Site 1213 basement units

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Chapter contents Abstract Introduction Volcanology and igneous petrology of Site 1213 Physical volcanology Petrography Alteration Interpretation and conclusions Acknowledgments References Figures F1. Stratigraphic column and site locations. F2. Lithologic summary. F3. Stratigraphic unit contacts. F4. Unit contact images. F5. Downhole summary and flow textures. F6. Extrusive-unit margin. F7. Interlocking crystal clumps. F8. Clinopyroxene microphenocrysts. F9. Plagioclase crystals. F10. Skeletal titanomagnetite. F11. Secondary phases and alteration. Table T1. Stratigraphic unit contacts. PDF file		Previous \| Next doi:10.2204/iodp.proc.324.109.2010 Massive basalt flows on the southern flank of Tamu Massif, Shatsky Rise: a reappraisal of ODP Site 1213 basement units¹ A.A.P. Koppers,² T. Sano,³ J.H. Natland,³ M. Widdowson,³ R. Almeev,³ A.R. Greene,³ D.T. Murphy,³ A. Delacour,³ M. Miyoshi,³ K. Shimizu,³ S. Li,³ N. Hirano,³ J. Geldmacher,³ and the Expedition 324 Scientists³ Abstract Drilling during Ocean Drilling Program Leg 198 at Site 1213 recovered three massive basalt units (8–15 m thick) from the southern flank of Tamu Massif at Shatsky Rise. Originally, these igneous units were interpreted to represent three diabase sills. During Integrated Ocean Drilling Program Expedition 324, this core was redescribed leading to the new conclusion that these diabase units represent three submarine massive basalt flows. These massive submarine flows were probably emplaced as inflated compound sheet flows during eruptions similar to those in large oceanic plateaus and continental flood basalts. ¹Koppers, A.A.P., Sano, T., Natland, J.H., Widdowson, M., Almeev, R., Greene, A.R., Murphy, D.T., Delacour, A., Miyoshi, M., Shimizu, K., Li, S., Hirano, N., Geldmacher, J., and the Expedition 324 Scientists, 2010. Massive basalt flows on the southern flank of Tamu Massif, Shatsky Rise: a reappraisal of ODP Site 1213 basement units. In Sager, W.W., Sano, T., Geldmacher, J., and the Expedition 324 Scientists, Proc. IODP, 324: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.324.109.2010 ²College of Oceanic and Atmospheric Sciences, Oregon State University, 104 COAS Administration Building, Corvallis OR 97331-5503, USA. akoppers@coas.oregonstate.edu ³Expedition 324 Scientists' addresses. Publication: 3 November 2010 MS 324-109 Top of page \| Previous \| Next