Tsugio Shibata, Professor E-mail: shibata@cc.okayama-u.ac.jp B.Ed., Hiroshima University, 1969 M.Sc., Hiroshima University, 1971 Ph.D., State University of New York at Albany, 1976 Faculty member at Okayama University since 1976 Area of Expertise: Petrology, Marine Geology

My main research interest is in understanding basaltic magmatism that takes place at various tectonic settings (i.e., mid-oceanic ridges, oceanic hot spots, and island arcs); in particular, I investigate the magmatic processes that lead to creation of oceanic lithosphere by sea-floor spreading at mid-oceanic ridges and back-arc basins. These processes are associated with and play a major role in a massive cycle of lithospheric materials within the Earth as plates are constantly created at mid-oceanic ridges and subducted back into the mantle at trenches. The upper part of the solid earth is by no means something that does not flow, but it is very much active and dynamic on a longer time scale. My research concerns this dynamic aspect of the solid earth from petrologic and geochemical perspectives. Current programs focus on the southern East Pacific Rise, Mariana Trough, Hawaiian Islands, Indian Ridge, and the inner zone of Southwest Japan.
In collaboration with one of our colleagues, I also conduct provenance studies on sedimentary rocks from the inner zone of Southwest Japan. In a sense, the study of sedimentary provenance is now multidisciplinary as it involves several of the major geological disciplines (i.e., sedimentology, stratigraphy, mineralogy, igneous and metamorphic petrology, geochemistry, etc.). We examine petrological and geochemical characteristics of sediments and based on these characteristics we infer their provenance and tectonic environment.

UNDERGRADUATE COURSES
913178 English A
910440 Introduction to Earth Science
055221 Elementary Petrology
055325 Igneous Petrology
055317 Field Methods in Geology

GRADUATE COURSES
Advanced Petrology
Igneous Petrogenesis

D. K. Asiedu, S. Suzuki and T. Shibata (2000) Provenance of sandstones from the Lower Cretaceous Sasayama Group, Inner Zone of Southwest Japan, Sediment. Geol., 131, 9-24.

D. K. Asiedu, S. Suzuki and T. Shibata (2000) Provenance of sandstones from the Wakino Subgroup of the Lower Cretaceous Kanmon Group, northern Kyushu, Japan, The Island Arc, 9, 128-144.

D. K. Asiedu, S. Suzuki and T. Shibata (2000) Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan: Constraints on provenance and tectonic environment, Geochem. Jour., 34, 155-173.

Shipboard Scientific Party (1999) Leg 179 Summary, In Pettigrew, T.L., Casey, J.F., Miller, D.J., et al., Proc. ODP, Init. Repts., 179: College Station, TX (Ocean Drilling Program), 1-26.

Shipboard Scientific Party (1999) Hammer Drill Site (1104 and 1106) and Site 1105, In Pettigrew, T.L., Casey, J.F., Miller, D.J., et al., Proc. ODP, Init. Repts., 179: College Station, TX (Ocean Drilling Program), 1-183 [CD-ROM].

R. W. Embley, J. E. Lupton, G. Massoth, T. Urabe, V. Tunnicliffe, D.A. Butterfield, T. Shibata, O. Okano, M. Kinoshita, and K. Fujioka (1998) Geologic, chemical, and biological evidence for recent volcanism at 17.5ﾟS: East Pacific Rise, Earth Planet. Sci. Lett., 163, 131-147.

D. K. Asiedu, S. Suzuki and T. Shibata (1998) Compositions of detrital spinels from Lower Cretaceous Sasayama Group, Hyogo Prefecture, Japan: Constraints on source lithology and tectonic setting, Jour. Min. Petrol. Econ. Geol., 93, 27-41.

D.K. Asiedu, S. Suzuki and T. Shibata (1997) Composition and provenance of detrital chromian spinels from Lower Cretaceous sediments, Okayama Prefecture, Mem. Geol. Soc. Japan, 48, 92-99.

S. Suzuki, D.K. Asiedu, and T. Shibata (1997) Compositions of sandstones of the Kenseki Formation and paleogeographic reconstruction in the Lower Cretaceous, Inner Side of Southwest Japan, Jour. Geol. Soc. Philippines, 52, 143-159.

D. K. Asiedu, S. Suzuki, and T. Shibata (1996) Provenance of Lower Cretaceous sediments in the Nariwa and Hokubo areas, Okayama Prefecture, deduced from detrital modes and geochemistry of sandstones, Okayama Univ. Earth Sci. Rpts., 3, 1-16.

T. Shibata, K. Nogami, and T. Inada (1996) Petrographic characteristics of stone artifacts from the Onbara 2 prehistoric site, Kamisaibara, Okayama Prefecture, Excavation of Paleolithic and Jomon Cultural Layers in the Chugoku Mountains, Western Japan (ed. T. Inada), p.258-266 (in Japanese with English abstract).

T. Urabe et al. (1995) The effect of magmatic activity on hydrothermal venting along the superfast-spreading East Pacific Rise, Science, 269, 1092-1095

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