JaLCDOI 10.18926/ESR/13902
FullText URL ESR_7_47.pdf
Author Yamagiwa Nobuo| Suzuki, Shigeyuki| Okimura Yuji|
Abstract A new rugose coral species, Lithostrotion (Siphonodendron) hinensis is described in this paper. It was collected from the Carboniferous Hina limestone in Okayama Prefecture, Southwest Japan. Judging from the paleontological data, the age indicates probably Late Viaean, Early Carboniferous.
Keywords Early Carboniferous rugosa Lithostrotion (Siphonodendron) Hina Limestone Okayama
Publication Title Okayama University Earth Science Report
Published Date 2000-09-20
Volume volume7
Issue issue1
Start Page 47
End Page 50
ISSN 1340-7414
language 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310319
JaLCDOI 10.18926/ESR/13844
Title Alternative バングラディシュの更新世台地の地形と地質
FullText URL EAR_13_1_1.pdf
Author Towhida Rashid| Md. hossain Monsur| Suzuki, Shigeyuki|
Abstract With regards to the origin and evolution of the Pleistocene tracts (Lalmai, Madhupur and Barind tracts) of Bangladesh, two trends of thoughts are common. Most of the authors believed that the Madhupur, Barind and Lalmai tracts represent tectonically uplifted surface. Some researchers have different opinion and they believed that the Lalmai hills and the Madhupur locality represent tectonically uplifted blocks but the whole Barind tract and the major portion of the Madhuput tracts are not tectonically uplifted, rather these are originated by erossional-depositional processes. In order to solve the problems associated with origin and evolution of Pleistocene tracts of Bangladesh, further study is needed. Borehole data may be collected and fusion images can be prepared from aerial photographs and setellite images to detect netectonic imprins and geomorphological signatures of the areas. Elaborate laboratory analysis of sediment deposits, radiocarbon dating my indicate a new dimension about the origin and evolution of these tracts.
Keywords Bangladesh Lalmai Hill Barind Tract Madhupur Tract Neotectonices Aerial photographs Satellite Image Fusion Image
Publication Title Okayama University Earth Science Report
Published Date 2006-03-31
Volume volume13
Issue issue1
Start Page 1
End Page 13
ISSN 1340-7414
language 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310445
JaLCDOI 10.18926/ESR/56694
FullText URL esr_025_031_038.pdf
Author Amano, Hideki| Suzuki, Shigeyuki| Sato, Masaru| Yanagida, Makoto|
Abstract The study area is situated in Japan Sea side margin of the Shakotan Peninsula, Hokkaido, Japan, where MIS5e Terrace is preserved along the cost. Numbers of tight drilling have done to establish new method for terrace analysis. Buried wave cut terrace and sea cliff (when the MIS5e Terrace was formed) are reconstructed by distribution of the terrace deposits and these bottom of unconformity planes. The precise site and altitude of former shoreline was also obtained. Altitudes of the former shoreline from the 7 sections are almost the same 22 to 27m in height. Previous data of the height of shoreline are obtained from the topographic MIS5e Terrace surface. The altitudes have variation from 30m to 60m. It suggests that the traditional method for the MIS5e terrace analysis had some errors in the study area.
Keywords MIS5e marine terrace terrace deposits tight drilling shoreline
Publication Title Okayama University Earth Science Report
Published Date 2018-12-27
Volume volume25
Issue issue1
Start Page 31
End Page 38
ISSN 1340-7414
language 英語
Copyright Holders © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
JaLCDOI 10.18926/ESR/13953
FullText URL ESR_1_9.pdf
Author Suzuki, shigeyuki|
Abstract The Iberian Pyrite Belt is an Upper Paleozoic succession which has been divided into the Phyllite-Quartzite Group, the Volcanic-Sliceous Complex and the Culm Group in ascending order from base to the top. The contacts among them are conformable. These Groups are tightly folded and metamorphosed un-der low-grade conditions during Hercynian times. The first stage folds of the Volcanic-Siliceous Complex and the Culm Group are associate with slaty cleavages (S1), while the Phyllite-Quartzite Group is asso-ciate with schistosities (S1). Fold analysis using cleavages and minoe folds has been utilized in the analysis of the stratigraphy. This led to systematic horizontal collection of specimens (pelitic rocks). S1 texture is defined by paralled alignment of secondary platy minerals which tend to grow larger and together, forming zonal domains toward the Phyllite-Quartzite Group. The clay matrices change to recrystallized quartz toward the Phyllite Quartzite Group. Textural modifications are evidenced by gradational changes from slaty cleavages to schistosities. This shows that recrystallization is the important deformation mecha-nism responsible for S1 development. It also reflects that the deformation was contemporaneous with metamorphism.
Keywords Slaty cleavage Schistosity Recrystallization
Publication Title Okayama University Earth Science Report
Published Date 1994-09-20
Volume volume1
Issue issue1
Start Page 9
End Page 18
ISSN 1340-7414
language 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310428
JaLCDOI 10.18926/ESR/13928
FullText URL ESR_3_17.pdf
Author Suzuki, Shigeyuki|
Abstract In eastern Chugoku area, Paleogene deposits have not been recognized until fission-track dating of so called "Mountain Gravels" was carried out (Suzuki et al. 1995). Two sedimentation events in Paleogene time (27Ma and 34-35Ma) are inferred by the F-T dating Major lithology of the Paleogene deposits in the study area is graved which is mainly composed of subrounded to rounded cobbles. The "Mountain Gravels" were previously thought to be lower Quaternary deposits. The "Mountain Gravels" is associsted with coal bearing mud, sand, gravel and breccia deposits. The breccia deposits is distributed sporadically between the "Mountain Gravels" and basement rocks. The deposits are mainly composed of poorly sorted breccia and associated granitic sands. It is inferred that the breccia deposits are talus deposits.
Keywords Paleogene breccia talus deposits fission-track dating
Publication Title Okayama University Earth Science Report
Published Date 1996-09-20
Volume volume3
Issue issue1
Start Page 17
End Page 24
ISSN 1340-7414
language 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310338
JaLCDOI 10.18926/ESR/55322
FullText URL esr_023_1_009_015.pdf
Author Takesue, Norito| Suzuki, Shigeyuki|
Abstract Analyzing of sedimentary facies and structure together with regional field mapping were studied in the mélange unit, upper Cretaceous Shimanto Belt, Wakayama Pref., SW Japan. The field survey was concentrated in the coast of Shiofuki-iwa, Miyama Complex, Hidakagawa Belt where soft deformations penetrate throughout the mélange unit. Brittle to ductile faults associated as later deformations are excluded. The mélange unit is subdivided into the Y-shear zone (YSZ) and P-foliation zone (PFZ). The YSZ is composed of thick lenticular sandstone (trends subparallel to the direction of the mélange), intense shear band (thin layer with concentrated prelithification shear deformation) and mudstone dominant mélange. The PFZ is composed of mudstone dominant mélange (associated with foliations which slightly oblique to the direction of the YSZ) and lenticular sandstone (slightly oblique to the direction of the YSZ). The intense shear band separates the YSZ and PFZ. Preserved radiolarian fossils free from deformation in the intense shear band is the evidence of the prelithification shear deformation in the mélange. A remarkable-fact is that the structures of mélange unit are formed under sinistral sense of shear. The mélange unit in the Shiofuki-iwa is ascribed to be formed by sinistral sense of shear during sediments were prelithified.
Keywords mélange Shimanto Belt Y-shear zone P-foliation zone intense shear band prelithification structures
Publication Title Okayama University Earth Science Report
Published Date 2016-12-27
Volume volume23
Issue issue1
Start Page 9
End Page 15
ISSN 1340-7414
language 英語
Copyright Holders © 2016 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
JaLCDOI 10.18926/ESR/19850
Title Alternative 岡山県に分布する白亜紀前期羽山層砕屑物質の供給源:砕屑粒の鉱物化学組成とモード組成から導かれる制約
FullText URL 016_029_042.pdf
Author Asiedu, Daniel K.| Suzuki, Shigeyuki| Shibata, Tsugio|
Abstract Petrographic and phase chemistry studies of detrital grains were carried out on sandstones from the Lower Cretaceous Hayama Formation, Inner Zone of Southwest Japan, to determine their provenance and the tectonic setting during the early Cretaceous. The results of the modal mineralogy suggest that the Hayama Formation has magmatic arc provenance and that deposition of the sediments took place in the back-arc areas with detritus mostly derived from the magmatic arc and rifted continental margins. The chemical compositions of chromian spinel, chlorite and sphene indicate that significant proportions of the detrital grains were derived from mafic and/or ultramafic sources. The source areas are the mafic and ophiolitic rocks in the Sangun-Renge and Akiyoshi terranes and the felsic volcanic rocks probably from either the Akiyoshi terrane or a source not presently exposed in southwest Japan. However, minor amounts of the detritus were derived from the basement rocks; i.e., carbonates and siliciclastic rocks of the Akiyoshi terrane and the metamorphosed mafic rocks of the Chizu terrane.
Keywords modal analysis sandstone mineral chemistry provenance Hayama Formation
Publication Title Okayama University Earth Science Report
Published Date 2009-12-25
Volume volume16
Issue issue1
Start Page 29
End Page 42
ISSN 1340-7414
language 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002309000
JaLCDOI 10.18926/ESR/13927
FullText URL ESR_3_1.pdf
Author Daniel K. Asiedu| Suzuki, Shigeyuki| Shibata, Tsugio|
Abstract Petrographic and geochemical study of sandstones from the Kenseki Formation have shown that the sandstones are compositionally immature. The immaturity is reflected geochemically by their low SiO2 contents (52-66 wt%) and petrographically by low modal percents of quartz and K-feldspar, and high modal percents of plagioclase and volcanic lithic fragmants. The Kensaki sandstones are, however, poor in Na2O (up to 2.1 wt%). Both petrography and geochemistry suggest a heterogeneous source lithologies of acidic and basic volcanics, sedimentary, and ultramafic rocks. Petrographic evidence is supplied by quartz and plagioclase of volcanic origin, acidic volcanic fragments, basic volcanic fragments, volcanic glass, serpentinite fragments and detrital spinel grains. Geochemical evidence is provided by high FeO* (total iron as FeO), MgO, TiO2, CaO and K2O contents. Petrographic and geochemical study of the Kenseki sandstones indicate calc-alkaline oceanic island are provenance. The sediments were locally derived, with Alpine-type ultramafic rocks exposed in the north and volcanic materials of the Akiyoshi Belt supplying the bulk of the detritus.
Keywords Kenseki Formation modal analyses provenance
Publication Title Okayama University Earth Science Report
Published Date 1996-09-20
Volume volume3
Issue issue1
Start Page 1
End Page 16
ISSN 1340-7414
language 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310277
JaLCDOI 10.18926/ESR/56695
FullText URL esr_025_039_048.pdf
Author Knittel, Ulrich| Walia, Monika| Suzuki, Shigeyuki| Lee, Yuan-Hsi|
Abstract The high-P/low-T Sanbagawa Metamorphic Belt that traverses SW Japan, has been subdivided into two belts thought to have been metamorphosed at ca. 120 Ma and at ca. 65 Ma (‘Sanbagawa Metamorphic Rocks’ and ‘Shimanto Metamorphic Rocks’). The subdivision was based on the assumption that metamorphism occurred at ca. 116 Ma, largely based on an early Rb-Sr isotope study and zircon data obtained for the eclogite unit of the Sanbagawa Belt, whereas in some parts of the belt detrital zircons of late Cretaceous age (90-80 Ma) were discovered. Analysis of detrital zircons sampled from two sites within the area considered to expose the older ‘Sanbagawa Metamorphic Rocks’, including the area investigated by the Rb-Sr study, reveals the presence of zircons younger than 95 Ma in all samples and some grains as young as 80 ± 4 Ma. It is therefore concluded that the Sanbagawa Belt is one single tectonic entity that formed in the Late Cretaceous though it contains older components, including fossiliferous clasts, older basic meta-volcanics and eclogite units that may record earlier metamorphic events.
Keywords U-Pb zircon dating Sanbagawa Metamorphic Belt Late Cretaceous Asemi River
Publication Title Okayama University Earth Science Report
Published Date 2018-12-27
Volume volume25
Issue issue1
Start Page 39
End Page 48
ISSN 1340-7414
language 英語
Copyright Holders © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
JaLCDOI 10.18926/ESR/13916
Title Alternative Landslide occurrence and geology of the Triassic Nariwa Group, Southwest Japan
FullText URL ESR_4_21.pdf
Author Hotani, Shu| Suzuki, Shigeyuki| Tanaka, Hajime| Yamada, Takuya|
Abstract Geological and topographical study of landslides in the Triassic Nariwa Group has been carried out. Nariwa Group is mostly composed of non-marine deposites and is characterized by cycle of fining upward successions. Landslides abundantly occur in the non-marine successions. Slip surface occure in coaly mudstones that have conspicuously less strength than sandstones. Creeps immediately below slip surfaces contribute to the occurrence of landslides in the Nariwa Group.
Keywords Iandslide Nariwa Group coaly mudstone
Publication Title Okayama University Earth Science Report
Published Date 1997-09-20
Volume volume4
Issue issue1
Start Page 21
End Page 32
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310343
JaLCDOI 10.18926/ESR/49211
Title Alternative The oldest fossil forest in Japan discovered from the Upper Triassic Nariwa Group, Okayama Prefecture, SW Japan -Implication for reconstruction of depositional environment and paleovegetation-
FullText URL esr_019_1_025_037.pdf
Author Yukawa, Hirokazu| Terada, Kazuo| Sun, Ge| Suzuki, Shigeyuki|
Abstract Erect fossil stumps were found from the outcrop of the Upper Triassic Hinabata Formation, the uppermost part of the Nariwa Group at Hinabata, Nariwa-cho,Takahashi City, Okayama Prefecture, SW Japan. They are evidence of the oldest fossil forest in Japan. The Upper Triassic Nariwa Group is mostly composed of non-marine deposits except the marine Jito Formation and characterized by the abundance in plant fossils. The marine Jito Formation is characterized by occurrence of Norian Monotis ochotica. On the basis of detailed observation of the occurrence of erect fossil stumps, as well as sedimentary facies of fossil-bearing unit, the fossil forest was interpreted to have grown on the top of the natural-levee units. One of the erect fossil stumps was identified as Xenoxylon sp.
Keywords erect fossil stump fossil forest Nariwa Group Upper Triassic Xenoxylon
Publication Title Okayama University Earth Science Report
Published Date 2012-12-26
Volume volume19
Issue issue1
Start Page 25
End Page 37
ISSN 1340-7414
language 日本語
Copyright Holders © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005232329
JaLCDOI 10.18926/ESR/13880
Title Alternative Pyrite spots formed along slaty cleavage texture of pelitic rocks of the Tamba Belt, Ujitawara Town, Kyoto Prefecture, Southwest Japan.
FullText URL ESR_9_19.pdf
Author Mikami, Teiji| Musashino, Makoto| Suzuki, shigeyuki|
Abstract Pyrite spots were identified in pelitic rocks from the Ujitawara area, southernmost part of Tamba belt. XMA analysis shows that the spots are composed of pyrite. The spots occur along slaty cleavage plane and form spotted shape of diameter of about 5mm.
Keywords The Tamba Group Ujitawata pelitic rocks pyrite spots slaty cleavage
Publication Title Okayama University Earth Science Report
Published Date 2002-09-20
Volume volume9
Issue issue1
Start Page 19
End Page 24
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310485
JaLCDOI 10.18926/ESR/13847
Title Alternative Geology of Holocene deposits in Mizushima Area, Okayama Prefecture, Japan
FullText URL EAR_13_1_15.pdf
Author Suzuki, Shigeyuki|
Abstract The study srea, Mizushima is occupied by polder and reclaimed land. The ground of this area is composed of the Holocene deposits below the surface. The deposits are mostly 10 to 20m in thickness and composed of 2 units, the B Unit and C&D Unit. The B Unit is composed of muddy sand with 2 to 3m in thickness. This unit is thought to be deposited in the mouth of paleoriver. The C&D Unit is composed of marine mud and sand with 10 to 15m in thickness. This unit is especially soft and will expand ground oscillations during an earthquake.
Keywords Holocene deposits Mizushima Area Ground oscillation
Publication Title Okayama University Earth Science Report
Published Date 2006-03-31
Volume volume13
Issue issue1
Start Page 15
End Page 18
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310562
JaLCDOI 10.18926/ESR/54117
Title Alternative Petrography of foundation stones of the Bizen Kokubunji Temple, Okayama Prefecture, Japan ―an attempt to identify their collected site―
FullText URL esr_022_1_025_030.pdf
Author Suzuki, Shigeyuki| Nishimura, Norihide| Ariga, Yuji|
Abstract The Bizen Kokubunji Temple was constructed in the 8th century, in Maya, Akaiwa City, Okayama. Only foundation stones are preserved. Geological characteristics of the foundation stones suggest that they are collected from mountain area of Maya, about 300 to 800m west from the site. The similarity of the foundation stones and the rocks Maya are identified by the following characteristics. 1) Assemblage of rock types (high grade welded tuff breccia, tuff breccia, tuffaceous sandstone and conglomerate) are the same. 2) Lithology of the 3 rock type of the foundation stones and the rocks from Maya are the same. 3) Rheomorphic flow structures are developed in both high grade welded tuff breccia. 4)Mudstone fragments are contained in both high grade welded tuff breccia tuff breccia.
Keywords Bizen Kokubunji Temple foundation stone collected site Okayama
Publication Title Okayama University Earth Science Report
Published Date 2015-12-27
Volume volume22
Issue issue1
Start Page 25
End Page 30
ISSN 1340-7414
language 日本語
Copyright Holders © 2015 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
File Version publisher
NAID 120005728630
Author Fujiwara, Takao| Suzuki, Shigeyuki|
Published Date 2002-09-20
Publication Title Okayama University Earth Science Report
Volume volume9
Issue issue1
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/ESR/13911
Title Alternative (14)C ages of Quaternary deposits in Kojima Lake area, Tamano City, Okayama Prefecture
FullText URL ESR_5_13.pdf
Author Sasaki, Hajime| Suzuki, Shigeyuki|
Abstract Two 14C ages are obtained from drilled core samples in Kojima Lake area. One is 7920±250 y.B.P. from peat which is just below silty clay of bay sediments (-14.30-14.61 m) The other is 24900+3450,-2450 y.B.P. from pale milky gray clay of fluvial sediments (-24.15-24.45 m).
Keywords (14)C age Quaternary Kojima Lake area
Publication Title Okayama University Earth Science Report
Published Date 1998-09-20
Volume volume5
Issue issue1
Start Page 13
End Page 16
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 80011114460
JaLCDOI 10.18926/ESR/13874
Title Alternative Distributions and ages of the Paleogene deposits in the Kibi Plateau Area, and Paleogene paleogeography
FullText URL earth_science_reports_010_1_15.pdf
Author Tanaka, Hajime| Suzuki, Shigeyuki| Hotani, Shu| Yamamoto, Yasuo| Danhara, Tohru|
Abstract The "Kibi Plateau" forms a unique geomorphic province with the gently-sloping and stable continental feature. Gravel deposites called the "Mountain Gravels", are distributed sporadically in the Kibi Plateau, and have been considered Pliocene deposits. However, recent fission-track ages of the tuff beds intercalated in the deposits have indicated that the ago of deposits are Paleogen in the age. So far, fission-track ages (using zircon) of 61 to 65, 55, 37, 34 to 35 and 27 Ma are obtained. Remaining the belt-like distributions of the Paleogene gravelly valley-full deposits suggest that the Kibe Plateau has been keeping as a stable block, and repeated periods of incision followed by sedimentation of valley-fill deposits are occurred in the area during Paleogene period.
Keywords Kibi Plateau gravelly valley-fill deposites fission-track ages Paleogene palaeogeography
Publication Title Okayama University Earth Science Report
Published Date 2003-12-20
Volume volume10
Issue issue1
Start Page 15
End Page 22
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310517
JaLCDOI 10.18926/ESR/13887
Title Alternative Trace of the Median Tectonic Line in Mima area, eastern Shikoku
FullText URL ESR_8_1_13.pdf
Author Mizui, Yoshinobu| Tachibana, Toru| Suzuki, shigeyuki|
Abstract Tracing outcrops of shear zone were used to describe the geometry and structure of the Median Tectonic Line in Mima area, eastrn Shikoku. A distinct new fault outcrop was discovered between the Mino and Ikuchi Faults at the northern slope of the Mt. Boso. These two faults are regarded as a single continuous fault. The analysis of surface fabrics of quartz in fault in fault gauge has been carried out to determine relative fault activity events.
Keywords surface fabrics fault gauge Mino-Ikuchi Fault Median Tectonic Line
Publication Title Okayama University Earth Science Report
Published Date 2001-09-20
Volume volume8
Issue issue1
Start Page 13
End Page 28
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310656
Author 野崎 貴博| 岩崎 志保| 鈴木 茂之| 山本 悦世| 南 健太郎| 田中 克典| 加藤 鎌司|
Published Date 2013-12-27
Publication Title 岡山大学埋蔵文化財調査研究センター紀要
Volume volume2012
Content Type Departmental Bulletin Paper
Title Alternative Bulletin of Archaeological Research Center Okayama University 2016
FullText URL barc_2016.pdf
Author Yamaguchi, Yuji| Yamamoto, Etsuyo| Suzuki, Shigeyuki| Iwasaki, Shiho| 白石 純| Minami, Kentaro| Nozaki, Takahiro| 佐藤 朗| 二宮 和彦|
Publication Title 岡山大学埋蔵文化財調査研究センター紀要
Published Date 2018-03-28
Volume volume2016
language 日本語
File Version publisher
Pages 86