Faculty Profiles - MICHIBAYASHI Katsuyoshi

CiNii Research

Workshop report on hard-rock drilling into mid-Cretaceous Pacific oceanic crust on the Hawaiian North Arch Reviewed

Quantitative analysis of trace elements in olivine with ICP-MS Reviewed

Kozaka Yukiko, Kato Takenori, Michibayashi Katsuyoshi, Kouketsu Yui, Asahara Yoshihiro

Abstracts of Annual Meeting of the Geochemical Society of Japan Vol. 67 ( 0 ) page： 131 2020

オマーンオフィオライト陸上掘削試料を用いたハードロック掘削における空隙率測定法の検討 Reviewed

道林克禎

地質学雑誌 Vol. 126 page： 713 - 717 2020

中部地方渋川地域三波川帯におけるヒスイ輝石の再確認：ダナイト中の細脈構成鉱物としての産出 Reviewed

道林克禎

地質学雑誌 Vol. 127 page： 59 - 65 2020

Morishita T., Umino S., Kimura J.I., Yamashita M., Ono S., Michibayashi K., Tominaga M., Klein F., Garcia M.O.

Scientific Drilling Vol. 26 page： 47 - 58 2019.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Scientific Drilling

The architecture, formation, and modification of oceanic plates are fundamental to our understanding of key geologic processes of the Earth. Geophysical surveys were conducted around a site near the Hawaiian Islands (northeastern Hawaiian North Arch region; Hawaiian North Arch hereafter), which is one of three potential sites for an International Ocean Discovery Program mantle drilling proposal for the Pacific plate that was submitted in 2012. The Hawaiian North Arch site is located in 78-81 Ma Cretaceous crust, which had an estimated full spreading rate of 7-8 cm yr-1. This site fills a major gap in our understanding of oceanic crust. Previously drilling has been skewed to young or older crust (< 15 or > 110 Ma) and slow-spread crust. P-wave velocity structure in the uppermost mantle of the Hawaiian North Arch shows a strong azimuthal anisotropy, whereas Moho reflections below the basement are variable: strong and continuous, weak, diffuse, or unclear. We assume that the strength of the Moho reflection is related to the aging of the oceanic plate. The Hawaiian volcanic chain (200 km to the southwest of the proposed drill site) and the nearby North Arch magmatism on the proposed Hawaiian North Arch sites might also have affected recognition of the Moho via deformation and/or magma intrusion into the lower crust of the uppermost mantle. This workshop report describes scientific targets for 2 km deep-ocean drilling in the Hawaiian North Arch region in order to provide information about the lower crust from unrecovered age and spreading rate gaps from previous ocean drillings. Other scientific objectives to be achieved by drilling cores before reaching the target depth of the project are also described in this report.

DOI： 10.5194/sd-26-47-2019

Elastic wave velocity and electrical conductivity in a brine-saturated rock and microstructure of pores Reviewed

Tohru Watanabe, Miho Makimura, Yohei Kaiwa, Guillaume Desbois, Kenta Yoshida, Katsuyoshi Michibayashi

Earth, Planets and Space Vol. 71 ( 1 ) 2019.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>Abstract</title>Elastic wave velocity and electrical conductivity in a brine-saturated granitic rock were measured under confining pressures of up to 150 MPa and microstructure of pores was examined with SEM on ion-milled surfaces to understand the pores that govern electrical conduction at high pressures. The closure of cracks under pressure causes the increase in velocity and decrease in conductivity. Conductivity decreases steeply below 10 MPa and then gradually at higher pressures. Though cracks are mostly closed at the confining pressure of 150 MPa, brine must be still interconnected to show observed conductivity. SEM observation shows that some cracks have remarkable variation in aperture. The aperture varies from ~ 100 nm to ~ 3 μm along a crack. FIB–SEM observation suggests that wide aperture parts are interconnected in a crack. Both wide and narrow aperture parts work parallel as conduction paths at low pressures. At high pressures, narrow aperture parts are closed but wide aperture parts are still open to maintain conduction paths. The closure of narrow aperture parts leads to a steep decrease in conductivity, since narrow aperture parts dominate cracks. There should be cracks in various sizes in the crust: from grain boundaries to large faults. A crack must have a variation in aperture, and wide aperture parts must govern the conduction paths at depths. A simple tube model was employed to estimate the fluid volume fraction. The fluid volume fraction of 10−4–10−3 is estimated for the conductivity of 10−2 S/m. Conduction paths composed of wide aperture parts are consistent with observed moderate fluctuations (< 10%) in seismic velocity in the crust.

DOI： 10.1186/s40623-019-1112-9

Other Link： http://link.springer.com/article/10.1186/s40623-019-1112-9/fulltext.html

Postmagmatic 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. Reviewed International coauthorship

Kurz W, Micheuz P, Christeson GL, Reagan M, Shervais JW, Kutterolf S, Robertson A, Krenn K, Michibayashi K, Quandt D

Geochemistry, geophysics, geosystems : G(3) Vol. 20 ( 12 ) page： 5867 - 5895 2019.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Geochemistry, Geophysics, Geosystems

International Ocean Discovery Program Expedition 352 recovered sedimentary-volcaniclastic successions and extensional structures (faults and extensional veins) that allow the reconstruction of the Izu-Bonin forearc tectonic evolution using a combination of shipboard core data, seismic reflection images, and calcite vein microstructure analysis. The oldest recorded biostratigraphic ages within fault-bounded sedimentary basins (Late Eocene to Early Oligocene) imply a ~15 Ma hiatus between the formation of the igneous basement (52 to 50 Ma) and the onset of sedimentation. At the upslope sites (U1439 and U1442) extension led to the formation of asymmetric basins reflecting regional stretch of ~16–19% at strain rates of ~1.58 × 10−16 to 4.62 × 10−16 s−1. Downslope Site U1440 (closer to the trench) is characterized by a symmetric graben bounded by conjugate normal faults reflecting regional stretch of ~55% at strain rates of 4.40 × 10−16 to 1.43 × 10−15 s−1. Mean differential stresses are in the range of ~70–90 MPa. We infer that upper plate extension was triggered by incipient Pacific Plate rollback ~15 Ma after subduction initiation. Extension was accommodated by normal faulting with syntectonic sedimentation during Late Eocene to Early Oligocene times. Backarc extension was assisted by magmatism with related Shikoku and Parece-Vela Basin spreading at ~25 Ma, so that parts of the arc and rear arc, and the West Philippine backarc Basin were dismembered from the forearc. This was followed by slow-rift to postrift sedimentation during the transition from forearc to arc rifting to spreading within the Shikoku-Parece-Vela Basin system.

DOI： 10.1029/2019GC008329

PubMed

Melt–fluid infiltration along detachment shear zones in oceanic core complexes: Insights from amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, the Philippine Sea Reviewed International coauthorship

Yumiko Harigane, Atsushi Okamoto, Tomoaki Morishita, Jonathan E. Snow, Akihiro Tamura, Hiroyuki Yamashita, Katsuyoshi Michibayashi, Yasuhiko Ohara, S. Arai

Lithos Vol. 344 page： 217 - 231 2019.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER

© 2019 Elsevier B.V. Multiple generations of amphibole may form in the lower crust due to magmatism and metamorphism during the development of oceanic core complexes. We investigated the occurrence and chemical compositions of amphibole in gabbro mylonites from the medial area of the Godzilla Megamullion along the Parece Vela Rift in the Philippine Sea. The samples contain brown and green amphiboles with a variety of different textures that may have different origins. The brown amphibole occurs mainly as blebs in clinopyroxene porphyroclasts (Bleb amphibole), the rims around clinopyroxene porphyroclasts (Coronitic amphibole), and as porphyroclasts and fine-grained amphibole within the matrix (Matrix amphibole). The trace element and Cl contents of the bleb and green amphiboles indicate magmatic and metamoprhic origins, respectively. The bleb amphibole is interpreted to have crystallized from a hydrous silicate melt derived from an oxide gabbro-forming melt prior to retrograde metamorphism. In contrast, the compositions of the coronitic amphibole and matrix amphibole vary between those of typical magmatic and metamorphic amphiboles, suggesting that the amphibole-forming reactions were continuously retrogressive. Retrograde metamorphism is generally interpreted to have involved seawater-derived fluids, but the trace element contents of the coronitic and matrix amphiboles do not differ significantly from those of the original minerals (i.e., clinopyroxene and plagioclase). One sample of gabbro mylonite (KH07–02-D18–1) contains amphiboles with high concentrations of light rare earth elements, indicating a large influx of externally derived LREE-enriched fluids. These fluids are interpreted to have formed from an interaction between hydrous silicate melt with LREE-enriched composition and seawater-derived fluid. Our results suggest that multiple phases of melt–fluid infiltration occurred during the development of the detachment fault at the Godzilla Megamullion.

DOI： 10.1016/j.lithos.2019.06.019

Deep Ocean Drilling Project and in situ observation of the Mantle

Trace element compositions of amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, Philippine Sea Reviewed International coauthorship

Harigane Y, Okamoto A, Morishita T, Snow JE, Tamura A, Yamashita H, Michibayashi K, Ohara Y, Arai S

Lithos Vol. 344 page： 217 - 231 2019

MICHIBAYASHI Katsuyoshi

Journal of High Pressure Institute of Japan Vol. 57 ( 3 ) page： 148 - 154 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：HIGH PRESSURE INSTITUTE OF JAPN(HPI)

Ocean drilling project has historically been commenced by Project MoHole in 1961drilling into mantle through the Mohorovicic discontinuity at 6km below seafloor at the same timing of the Apollo project sending human to the Moon. It has been more than 50 years since then, and it has been just 50 years since the launch of Deep Sea Drilling Project (DSDP) in 1968 after Project MoHole. A compilation of holes into the ocean crust cored by scientific ocean drilling since the beginning of DSDP to 2018 highlights that only 38 holes deeper than 100m have been cored in oceanic crust and the total recovered ocean crustal material represents <2% of the cores. However, despite this relative paucity of material, scientific ocean drilling has provided essential and hitherto unavailable observations for advancing our understanding of the processes that repave nearly 70% of Earth's surface over short geological time scales (<200 million years) : these include better knowledge of ocean crust architecture and the accretion in processes in the axial zone of mid-ocean ridge spreading centers. It is still our ambition to explore the deep interior of our planet by scientific drilling in ocean, the most successful, long-term international scientific collaboration in any field. The Mohole-to-Mantle (M2M) project will sample for the first time upper mantle peridotites at a fast-spreading mid-ocean ridge. This will be achieved by drilling by D⁄V Chikyu through intact fast-spread oceanic crust, and ∼500m into the mantle lithosphere.

DOI： 10.11181/hpi.57.148

CiNii Research

Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests Reviewed

Toshiaki Masuda, Yasutomo Omori, Ryoko Sakurai, Tomoya Miyake, Mirai Yamanouchi, Yumiko Harigane, Atsushi Okamoto, Katsuyoshi Michibayashi

Journal of Structural Geology Vol. 117 page： 96 - 104 2018.12

Language：English Publishing type：Research paper (scientific journal)

© 2018 Elsevier Ltd Depth-sensing indentation tests were performed to obtain the loop energy (equivalent to the energy consumed to produce the indentation) and the residual depth of the indentation using a triangular pyramidal diamond indenter for the minerals in Mohs hardness scale except for diamond, as well as other minerals (apophyllite, forsterite, and tourmaline), at a maximum load ranging from 30 to 100 mN. A new graphic presentation is proposed that shows the hardness of minerals in log(penetration depth)−log(loop energy) space. The data for each mineral under different loads give a straight regression line with a slope of 2.6–2.9 (except for talc, which yields a slope of 2.2), while the data for different minerals under a given load yield a straight regression line with a slope of 1.1–1.2. A theoretical analysis of ideal materials, in terms of log(penetration depth)−log(loop energy) space, shows the existence of two series of parallel regression lines with slopes of 3 (data for each mineral at different loads) and 1 (data for different minerals under a given load). The results show a slight deviation between the measured and theoretical slopes, probably reflecting a progressive change in the mechanical properties of the minerals during the indentation tests.

DOI： 10.1016/j.jsg.2018.09.004

Poisson's Ratio and Auxetic Properties of Natural Rocks Reviewed

Shaocheng Ji, Le Li, Hem Bahadur Motra, Frank Wuttke, Shengsi Sun, Katsuyoshi Michibayashi, Matthew H. Salisbury

Journal of Geophysical Research: Solid Earth Vol. 123 ( 2 ) page： 1161 - 1185 2018.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Blackwell Publishing Ltd

Here we provide an appraisal of the Poisson's ratios (υ) for natural elements, common oxides, silicate minerals, and rocks with the purpose of searching for naturally auxetic materials. The Poisson's ratios of equivalently isotropic polycrystalline aggregates were calculated from dynamically measured elastic properties. Alpha-cristobalite is currently the only known naturally occurring mineral that has exclusively negative υ values at 20–1,500°C. Quartz and potentially berlinite (AlPO4) display auxetic behavior in the vicinity of their α-β structure transition. None of the crystalline igneous and metamorphic rocks (e.g., amphibolite, gabbro, granite, peridotite, and schist) display auxetic behavior at pressures of &gt
5 MPa and room temperature. Our experimental measurements showed that quartz-rich sedimentary rocks (i.e., sandstone and siltstone) are most likely to be the only rocks with negative Poisson's ratios at low confining pressures (≤200 MPa) because their main constituent mineral, α-quartz, already has extremely low Poisson's ratio (υ = 0.08) and they contain microcracks, micropores, and secondary minerals. This finding may provide a new explanation for formation of dome-and-basin structures in quartz-rich sedimentary rocks in response to a horizontal compressional stress in the upper crust.

DOI： 10.1002/2017JB014606

In situ carbon mineralization in ultramafic rocks: Natural processes and possible engineered methods Reviewed International coauthorship

Kelemen P.B, Aines R, Bennett E, Benson S.M, Carter E, Coggon J.A, Obeso J.C, Evans O, Gadikota G, Dipple G.M, Godard M, Harris M, Higgins J.A, Johnson K.T.M, Kourim F, Michibayashi K, Morishita T, Takazawa E

Energy Procedia Vol. 146 page： 92 - 102 2018

Geodynamic implications of crustal lithologies from the southeast Mariana forearc Reviewed International coauthorship

Mark K. Reagan, Luan Heywood, Kathleen Goff, Katsuyoshi Michibayashi, C. Thomas Foster, Brian Jicha, Thomas Lapen, William C. McClelland, Yasuhiko Ohara, Minako Righter, Sean Scott, Kenneth W.W. Sims

Geosphere Vol. 14 ( 1 ) page： 1 - 22 2017.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Geological Society of America

The deep submergence research vehicle Shinkai 6500, diving on the Challenger segment of the Mariana forearc, encountered a superstructure of nascent arc crust atop a younger mantle with entrained fragments of metamorphosed crust. A plutonic block from this crust collected at 4900 m depth has a crystallization age of 46.1 Ma and mixed boninitic-arc tholeiitic geochemical signatures. A hornblende garnetite and two epidote amphibolites were retrieved from depths between 5938 m and 6277 m in an area dominated by peridotite. The garnetite appears to represent a crystal cumulate after melting of deep arc crust, whereas the amphibolites are compositionally similar to enriched mid-ocean ridge basalt (MORB). The initial isotopic compositions of these crustal fragments are akin to those of Eocene to Cretaceous terranes along the periphery of the Philippine plate. The garnetite achieved pressures of 1.2 GPa or higher and temperatures above 850 °C and thus could represent a fragment of the delaminated root of one of these terranes. This sample has coeval Sm-Nd, Lu-Hf, and 40Ar-39Ar ages indicating rapid ascent and cooling at 25 Ma, perhaps in association with rifting of the Kyushu-Palau arc. Peak P-T conditions were lower for the amphibolites, and their presence on the ocean floor near the garnetite might have resulted from mass wasting or normal faulting. The presence of relatively fusible crustal blocks in the circulating mantle could have contributed to the isotopic similarity of Mariana arc and backarc lavas with Indian Ocean MORB.

DOI： 10.1130/GES01536.1