JaLCDOI 10.18926/ESR/56695
フルテキストURL esr_025_039_048.pdf
著者 Knittel, Ulrich| Walia, Monika| Suzuki, Shigeyuki| Lee, Yuan-Hsi|
抄録 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.
キーワード U-Pb zircon dating Sanbagawa Metamorphic Belt Late Cretaceous Asemi River
出版物タイトル Okayama University Earth Science Report
発行日 2018-12-27
25巻
1号
開始ページ 39
終了ページ 48
ISSN 1340-7414
言語 English
著作権者 © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
JaLCDOI 10.18926/ESR/56694
フルテキストURL esr_025_031_038.pdf
著者 Amano, Hideki| Suzuki, Shigeyuki| Sato, Masaru| Yanagida, Makoto|
抄録 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.
キーワード MIS5e marine terrace terrace deposits tight drilling shoreline
出版物タイトル Okayama University Earth Science Report
発行日 2018-12-27
25巻
1号
開始ページ 31
終了ページ 38
ISSN 1340-7414
言語 English
著作権者 © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
JaLCDOI 10.18926/ESR/56691
タイトル(別表記) Non-calcareous beachrock found in Akagurisaki, Ohi Town, Fukui Prefecture
フルテキストURL esr_025_001_005.pdf
著者 鈴木 茂之| 東 洋一| 出山 康代| 湯川 弘一| 臼井 まゆみ|
抄録 Beachrock which was formed about 0.5 meter higher than high tide is found in Akagurisaki, Ohi Town, Fukui Prefecture. The outcrops always get wet by spring water. The sediments are composed of well sorted rounded gravels and sands but calcareous shell is not found at all. Intergranular space is occupied by white amorphous cement. Magnesium and silicon rich composition of the cement is obtained by EPMA analysis. There is a conjecture that the magnesium rich cement was precipitated in spite of solution of calcareous shell under saturated state by spring water, because calcium has a higher tendency to ionize than magnesium.
キーワード Beachrock Akagurisaki non-calcareous cement ionization tendency
出版物タイトル Okayama University Earth Science Report
発行日 2018-12-27
25巻
1号
開始ページ 1
終了ページ 5
ISSN 1340-7414
言語 Japanese
著作権者 © 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
著者 山本 悦世| 山口 雄治| 鈴木 茂之|
発行日 2018-02
資料タイプ 研究報告書
JaLCDOI 10.18926/ESR/13875
タイトル(別表記) Depositional environments of the Katsuta Group, eastern Tsuyama Basin, Southwest Japan
フルテキストURL earth_science_reports_010_1_23.pdf
著者 山崎 良| 鈴木 茂之|
抄録 The Miocene Katauta Group of the Syohoku-cho area is subdivides into 6 members ; The Uetsuki Conglomerate Member, Nara Sandy Mudstone Member, Tai Gravelly Sandstone Member, Takatori Conglomerate Member, Ayabe Mudstone Member and Maruyama Mutstone Member from bottom to top. The unconformity between Miocene deposits and basement rocks in this area was traced to obtain geometry of the Miocene basin. Contour maps of the bases of the Miocene Yoshino Formation and Takakura Formation indicate paleo-topography. The obtained topography demonstrates a valley, which flowed to north-west, and a few islands and bays. It indicates that these Miocene successuions were deposited in the topography which resemble to the present Seto Inland.
キーワード Katsuta Group Tsuyama Basin Miocene geometry of basin paleoenvironmental chage
出版物タイトル Okayama University Earth Science Report
発行日 2003-12-20
10巻
1号
開始ページ 23
終了ページ 31
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310475
JaLCDOI 10.18926/ESR/13874
タイトル(別表記) Distributions and ages of the Paleogene deposits in the Kibi Plateau Area, and Paleogene paleogeography
フルテキストURL earth_science_reports_010_1_15.pdf
著者 田中 元| 鈴木 茂之| 宝谷 周| 山本 裕雄| 壇原 徹|
抄録 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.
キーワード Kibi Plateau gravelly valley-fill deposites fission-track ages Paleogene palaeogeography
出版物タイトル Okayama University Earth Science Report
発行日 2003-12-20
10巻
1号
開始ページ 15
終了ページ 22
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310517
JaLCDOI 10.18926/ESR/13870
タイトル(別表記) Paleoenvironmental Analyses of the Buried Peat Deposit during the mid-Holocene at the Desaki Coast in Tamano City, Okayama Prefecture, Weatern Japan
フルテキストURL earth_science_reports_011_1_39.pdf
著者 松下 まり子| 佐藤 裕司| 鈴木 茂之| 行基 幸一| 百原 新| 植田 弥生| 加藤 茂弘| 前田 保夫|
抄録 The buried peat deposit was foud in the sand beach on the Desaki coast (Tamano City, Okayama Prefecture), the northeastern coast of Seto Inland Sea. In this study, we performed sulfur and diatom analyses of the deposit. The results were used along with 14C dates and the eruption age (7300 cal BP) of Kikai-Akahoya tephra (K-Ab) to derive sedimentary environments of the deposit. K-Ah was detected just below the peat deposit. At the culmination of the Jomon transgression, the peat deposit had been formed in brackish environments of salt marsh for about 300 years. In order to reconstruct local paleovegetation, we analyzed pollen, wood and plant fossils in the deposit. The results show vegetational transition from a deciduous broadleaved forest mainly of Ouercus subgen. Lepidobalanus to Pinus forest. In spite of the Holocene thermal optimum, the vegetation dominated by Ouercus subgen. Cyclobanopsis was not recognized at the Desaki site, as has been shown in many other regions of regions of western Japan. Ouercus sect. Prinus was replaced by Ouercus sect. Aegilops as the dominant section of Ouercus subgen. Lepidobalanus, suggesting early establishment of traditional rural vegetation of 'Satoyama' in Japan. However, no evidence for human agency has been obtained from the mid-Holocene archaeological sites around the Desaki site. Thus it is more likely that this vegetational transition resulted from the succession caused by natural forces such as ecological disturbance and climatic and/or endemic situations rather than by cultural deforestation.
キーワード Desaki coast diatom remains Jomon transgression Kikai-Akahoya tephra mid-Holocene Paleoenvironment peat deposit plant fossils
出版物タイトル Okayama University Earth Science Report
発行日 2004-12-31
11巻
1号
開始ページ 39
終了ページ 47
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310603
JaLCDOI 10.18926/ESR/13869
タイトル(別表記) Relative sea-level changes of the Okayama Plain Area during the Holocene, Southwest Japan
フルテキストURL earth_science_reports_011_1_33.pdf
著者 鈴木 茂之|
抄録 Postglacial relative sea-level change of the Okayama Plain Area has been analyzed. Former sea-levels were recognized by using peat beds and marine organisms which are also available for 14C dating. Peat beds were rhought to be formed under a stable sea-level condition. 14C ages of the analyzed peat beds were seprated by 4 groups ; 30~18 ka BP, 11~8 ka BP, 6~4 ka BP and 3~2.5 ka BP, indicate 4 stable sea-level periods. 2 transgressive events (18~11 ka BP and 8~6 ka BP) and one regressive event (3.5?~3 ka BP) were also inferred.
キーワード sea-level change peat bed Holocene Okayama Plain
出版物タイトル Okayama University Earth Science Report
発行日 2004-12-31
11巻
1号
開始ページ 33
終了ページ 37
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310268
JaLCDOI 10.18926/ESR/13847
タイトル(別表記) Geology of Holocene deposits in Mizushima Area, Okayama Prefecture, Japan
フルテキストURL EAR_13_1_15.pdf
著者 鈴木 茂之|
抄録 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.
キーワード Holocene deposits Mizushima Area Ground oscillation
出版物タイトル Okayama University Earth Science Report
発行日 2006-03-31
13巻
1号
開始ページ 15
終了ページ 18
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310562
JaLCDOI 10.18926/ESR/13844
タイトル(別表記) バングラディシュの更新世台地の地形と地質
フルテキストURL EAR_13_1_1.pdf
著者 Towhida Rashid| Md. hossain Monsur| 鈴木 茂之|
抄録 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.
キーワード Bangladesh Lalmai Hill Barind Tract Madhupur Tract Neotectonices Aerial photographs Satellite Image Fusion Image
出版物タイトル Okayama University Earth Science Report
発行日 2006-03-31
13巻
1号
開始ページ 1
終了ページ 13
ISSN 1340-7414
言語 English
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310445
JaLCDOI 10.18926/ESR/52165
タイトル(別表記) On Periploma mitsuganoense Araki (Bivalvia: Mollusca) from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, southwest Japan ―with special reference to it’s paleogeographic significance―
フルテキストURL esr_020_1_007_011.pdf
著者 田口 栄次| 岸本 眞五| 鈴木 茂之|
抄録 In this paper, we deal with re-description of Periploma mitsuganoense Araki and it’s morphological variation and significance of the molluscan fauna of it from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, Southwest Japan. Moreover, the paleogeographic significance of this species is analyzed. The obtained results are summarized as follows: 1. The morphological variation of Periploma mitsuganoense Araki has a wide range on the basis of the analysis of the morphological outline. 2. The occurrence of P. mitsuganoense Araki from the Pectinid fauna is the first record in the West Setouchi Geological Province. 3. It is presumable that P. mitsuganoense Araki is an endemic species in the First Setouchi Geological Province from a view point of it’s spatial distribution.
キーワード Periploma mitsuganoense Araki Mollusca Miocene Bihoku Group morphological variation paleogeographic significance
出版物タイトル Okayama University Earth Science Report
発行日 2013-12-27
20巻
1号
開始ページ 7
終了ページ 11
ISSN 1340-7414
言語 Japanese
著作権者 © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005394593
JaLCDOI 10.18926/ESR/52164
タイトル(別表記) Debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture
フルテキストURL esr_020_1_001_006.pdf
著者 木村 裕貴| 鈴木 茂之|
抄録 The debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture caused by the hard rain of Typhoon 12 of September, 2011. Furthermore, 11 small landslides occurred in the study area. In this area, the altitude of mountainous are not so high (150m to 250m) and the amount of precipitation which producted the debris avalanche was not very serious quantity with 230mm. However the debris avalanche occurred. One private house collapsed, and the first floor part of the Kitamura Elementary School was buried due to the debris flow. The purpose of this study is to examine causes of the debris avalanche disaster occurred in Kitamura area using applied geological technique. The length of the debris avalanche scar is about 250m, and alluvial fan is formed as a debris slope. The ground is composed of weathered granite and the bottom of the valley was filled by soils derived from disintegrated granite. There are three small landslides as head scarps with steep slopes at approximately 30°-35°. The debris avalanche was inferred to have started as a shallow soil slip at the head by rainfall. 3 major causes are inferred which originated the debris avalanche in the study area; steep slope, ground composed of weathered granite, existence of sandy soil which occupied at the bottom of valley.
キーワード debris avalanche steep slope weathered granite
出版物タイトル Okayama University Earth Science Report
発行日 2013-12-27
20巻
1号
開始ページ 1
終了ページ 6
ISSN 1340-7414
言語 Japanese
著作権者 © 2013 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005394592
JaLCDOI 10.18926/ESR/49211
タイトル(別表記) 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-
フルテキストURL esr_019_1_025_037.pdf
著者 湯川 弘一| 寺田 和雄| 孫 革| 鈴木 茂之|
抄録 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.
キーワード erect fossil stump fossil forest Nariwa Group Upper Triassic Xenoxylon
出版物タイトル Okayama University Earth Science Report
発行日 2012-12-26
19巻
1号
開始ページ 25
終了ページ 37
ISSN 1340-7414
言語 Japanese
著作権者 © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005232329
JaLCDOI 10.18926/ESR/49208
タイトル(別表記) Folded structure of the Carboniferous Ko-yama Limestone Group, Akiyoshi Belt, SW JAPAN
フルテキストURL esr_019_1_005_011.pdf
著者 稲田 徳之| 鈴木 茂之| 石田 啓祐|
抄録 The fold structure of the Akiyoshi Belt was analyzed in Kawakami-cho, Okayama Prefecture, where the Lower Carboniferous to Middle Permian Ko-yama Limestone Group (Yokoyama et al., 1979), Permian Yoshii Group (Sano et al., 1987) and Triassic Nariwa Group (Teraoka, 1959) are distributed. The Nariwa Group unconformably covers the Paleozoic successions (Otoh, 1985). The Lower Carboniferous to Middle Permian Ko-yama Limestone Group, dated by foraminifers and fusulinids (Yokoyama et al., 1979), is mainly composed of massive limestone with basic volcanics, acidic tuff and chert. The Paleozoic successions of the Akiyoshi Belt were folded during the Middle to Late Permian (Suzuki et al., 1990). Strata of the Ko-yama Limestone Group generally strike E-W and dip to the north. The Hoya section about 300 m thick is composed of limestone, basic tuff, chert and acidic tuff, limestone, basic lava and tuff in ascending order. In this section, Ishida et al. (2012) recognized a nearly complete conodont faunal succession ranging from the upper Visean to the lower Moscovian. The faunal succession indicates younging southward, and the strata are overturned. A folded strucuture of tight overfold with north-dipping axial plane was reconstructed. Similar style of small scale overfolds of banded chert and turbidite were observed in the overlying Yoshii Group.
キーワード folded structure Ko-yama Limestone Group Carboniferous Akiyoshi Belt
出版物タイトル Okayama University Earth Science Report
発行日 2012-12-26
19巻
1号
開始ページ 5
終了ページ 11
ISSN 1340-7414
言語 Japanese
著作権者 © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005232326
JaLCDOI 10.18926/ESR/49207
タイトル(別表記) Holocene environmental and sea-level changes of the Okayama Plain – evidence from peat beds –
フルテキストURL esr_019_1_001_004.pdf
著者 鈴木 茂之|
抄録 Quaternary peat beds from bore-hole samples deliver information to reconstruct paleoenvironment. Altitudes of dated non-marine peat beds and marine beds allow to be created a sea-level curve. 4 peat beds (A to D) are identified from the uppermost Pleistocene to Holocene deposits of the Okayama Plain. They thought to be deposited at stable events during sea-level change.
キーワード Holocene peat beds paleoenvironment sea-level change Okayama Plain
出版物タイトル Okayama University Earth Science Report
発行日 2012-12-26
19巻
1号
開始ページ 1
終了ページ 4
ISSN 1340-7414
言語 Japanese
著作権者 © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120005232325
JaLCDOI 10.18926/ESR/47747
タイトル(別表記) Newly proposed landform division in the Kibi Plateau area: Application for a hazard map of landslides
フルテキストURL esr_018_1_005_010.pdf
著者 鈴木 茂之| 大溝 佑奈| 平田 稔| 西垣 誠|
抄録 The Kibi Plateau is characterized by horizontal skylines and they are considered to be an uplifted peneplain. Landform of the plateaus in central part of Okayama Prefecture is divided into "Kibi plateau landform" and "Recent dissecting landform". The Kibi plateau landform is composed of low relief surface and relict mountain. The altitude of the low relief surface varies from 300 to 450m in Kayo area, and 200 to 350m in Kanayama area. The Recent dissecting landform is characterized by escarpment and cuts the Kibi plateau landform. Knick-point is formed at the boundary between two landforms and steep slope is distributed just below the knick-point. The steep slope of the recent dissecting landform is unstable and a potential of landslide is high.
キーワード Kibi Plateau landslide knick-point Okayama Prefecture
出版物タイトル Okayama University Earth Science Report
発行日 2011-12-26
18巻
1号
開始ページ 5
終了ページ 10
ISSN 1340-7414
言語 Japanese
著作権者 © 2011 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン publisher
NAID 120003796475
JaLCDOI 10.18926/ESR/19850
タイトル(別表記) 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
フルテキストURL 016_029_042.pdf
著者 アシード ダニエル| 鈴木 茂之| 柴田 次夫|
抄録 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.
キーワード modal analysis sandstone mineral chemistry provenance Hayama Formation
出版物タイトル Okayama University Earth Science Report
発行日 2009-12-25
16巻
1号
開始ページ 29
終了ページ 42
ISSN 1340-7414
言語 English
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002309000
JaLCDOI 10.18926/ESR/19848
タイトル(別表記) The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri (1799-1863)
フルテキストURL 016_001_007.pdf
著者 岡田 博有| 鈴木 茂之|
抄録 The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri, a scientific contributor in the Tokugawa regime in the 19th century, who was born in 1799 in Tsuyama in Western Honshu, Japan and had worked for scientific activities of the Tokugawa government from 1839 to 1863. His major works for the first making of the "chishitsu-gaku" for the "geology" have been presented in this paper, also showing his contribution to Japanese sciences.
キーワード Genpo Mitsukuri "chishitsu-gaku" 19th century
出版物タイトル Okayama University Earth Science Report
発行日 2009-12-25
16巻
1号
開始ページ 1
終了ページ 7
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002309076
JaLCDOI 10.18926/ESR/15024
タイトル(別表記) Microscopic observations of the recent soils: a step for understanding the paleosols
フルテキストURL 015_009_032.pdf
著者 福地 亮| 鈴木 茂之|
抄録 The microscopic observations of the recent soil horizons were conducted in Okayama, Japan (moderate climate). The several soil horizons, including two surface (epipedon) and three subsurface horizons, were recognized in the forest, poorly vegetated hill, and riverside around the Okayama University. The umbric epipedon can be segregated from the organic-rich subsurface horizons by the scattered organic materials in thin sections. The ochrich epipedon shows the sandy matrix without any cements and the illuviation of clay minerals. The subsurface horizons identified in the study area are as follows: albic, argillic, and cambic horizons. Each subsurface horizon shows the specific structures in thin sections. The albic horizon is characterized by the absence of the illuviation. The argillic horizon definitely shows the clayey matrix and the illuviation of clay minerals. The primary structures may be retained in the cambic horizon. The microscopic examination of the Miocene paleosols from the Ukan-cho, Okayama, was attempted. By comparing the recent soils, the cambic horizon and spodic horizon, which is characterized by the concentration of sesquioxides, are identified in the paleosols. This attempt suggests that the microscopic observations of the recent soils is a useful guide to understanding the paleosols
キーワード soil paleosol soil horizon soil structure microscopic observation
出版物タイトル Okayama University Earth Science Report
発行日 2009-03-31
15巻
1号
開始ページ 9
終了ページ 32
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002307964
JaLCDOI 10.18926/ESR/15022
タイトル(別表記) Permian and Triassic molluscan fossils from the Maizuru Zone,Okayama City, Southwest Japan
フルテキストURL 015_001_008.pdf
著者 中澤 圭二| Roger Lyman Batten| 鈴木 茂之| 宇和田 英人|
抄録 Permian and Triassic molluscan fossils are found from Mitsu-area, Okayama City, Southwest Japan. Permian bivalve and gastropod fossils are collected from mudstones of the Upper Formation of the Maizuru Group. 4 species of bivalves (Nuculopsis? sp. ind., Leptodesma sp. ind., Streblopteria cf. eichwaldi, Posidonia sp. ind.) and 5 species of gastropods (Worthenia cf. corrugata, Callitomaria n. sp. cf. stanislavi, Apachella n. sp. ind., ??Eunemopsis like trochid, ??Yunnania sp.) are identified. Lower Triassic bivalve fossils are collected from sandstones of the Oono Formation. Neoschizodus cf. laevigatus and Bakevellia (Maizuria) kambei are identified.
キーワード Permian Triassic bivalve and gastropod fossils the Maizuru Zone Mitsu area
出版物タイトル Okayama University Earth Science Report
発行日 2009-03-31
15巻
1号
開始ページ 1
終了ページ 8
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002307247