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Masayuki Ikeda
University of Tokyo
GeomorphologyGeologyPaleontologyDeep seaSedimentary rock
57Publications
9H-index
331Citations
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Publications 57
Newest
#1Masayuki Ikeda (UTokyo: University of Tokyo)H-Index: 9
#2Ryuji Tada (Chiba Institute of Technology)H-Index: 39
Abstract Astronomical solutions for planetary orbits beyond several tens of million years (Myr) ago have large uncertainties due to the chaotic nature of the Solar System, mainly Myr-scale cycles related with the Earth-Mars secular resonance. Our only accessible archive for unraveling the Earth's orbital variations in the geologic past are sedimentological records, yet their reliability and uncertainties are still debated. Here, we describe Myr-scale orbital signals of early Mesozoic monsoon rec...
Source
#1Ryusei Kuma (Nagoya University)H-Index: 1
#2Hitoshi Hasegawa (Kōchi University)H-Index: 10
Last. Masayuki Ikeda (Shizuoka University)H-Index: 9
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Rhythmically bedded cherts are observed in both pelagic marine and lacustrine deposits, but the formation mechanism in the latter remains highly uncertain. Our study of alternating chert–dolomite beds in the Eocene Green River Formation, Utah, USA reveals dense accumulations of organic-matter spheres (30–50 μm diameter) of probable algal cyst origin in the chert layers, and centennial- to millennial-scale periodicities in chert layer deposition. A positive correlation between the degree of degra...
1 CitationsSource
#1Ryusei KumaH-Index: 1
#2Hitoshi HasegawaH-Index: 10
Last. Jessica H. WhitesideH-Index: 15
view all 7 authors...
Source
#1Ryuji TadaH-Index: 39
#2Tomohisa IrinoH-Index: 19
Last. Masafumi MurayamaH-Index: 23
view all 6 authors...
#1Masayuki Ikeda (Shizuoka University)H-Index: 9
#2Rie S. Hori (Ehime University)H-Index: 16
Last. Kazuyoshi YamadaH-Index: 1
view all 6 authors...
Abstract One of the most profound environmental changes in the Mesozoic occurred during the Pliensbachian-Toarcian (Pl/To) time interval, including massive black shale deposition across Pl/To boundary and early Toarcian Oceanic Anoxic Event (T-OAE). These events are associated with negative carbon isotope excursions (CIEs), but their temporal link with 12C-rich carbon injection, possibly related with Karoo-Ferrar volcanisms and carbon cycle feedbacks, such as terrestrial methanogenesis and metha...
2 CitationsSource
#1Akihisa Kitamura (Shizuoka University)H-Index: 17
#2Mami Ito (Shizuoka University)H-Index: 3
Last. Masayuki Ikeda (Shizuoka University)H-Index: 9
view all 4 authors...
Four ancient tsunami deposits were identified in a trench excavated on Ishigaki Island, Okinawa, Japan. Three of the tsunami deposits (T-I, T-II, and T-IV) consist of calcareous sand beds, whereas the other (T-III, located stratigraphically between T-II and T-IV) consists of boulders. Deposit T-I was caused by a tsunami in 1771. 14C dating, together with the elevations of the landward margins of these sandy tsunami deposits, suggests that tsunamis II and IV were similar in size to the 1771 tsuna...
3 CitationsSource
#1Ryuji Tada (PSI: Planetary Science Institute)H-Index: 39
#2Arisa Seki (PSI: Planetary Science Institute)H-Index: 5
Last. Masayuki IkedaH-Index: 9
view all 5 authors...
#1Ryusei KumaH-Index: 1
#2Hitoshi HasegawaH-Index: 10
Last. Jessica H. WhitesideH-Index: 15
view all 5 authors...
#1Masayuki IkedaH-Index: 9
#2Takahiro NakajimaH-Index: 3
Last. Kozo SatoH-Index: 15
view all 5 authors...
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