Journal of the Sedimentological Society of Japan

Fluorescent characteristics of macerals by fluorescent visual kerogen method

Akiko Omura, Daisuke Ikedzu, Koichi Hoyanagi

2000 Volume 52 Issue 52 Pages 1-4
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.1

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Submarine topography of Kaihara, a shallow marine sandridge, off Nogutsuna Island, Ehime Prefecture, Japan

observations using narrow multibeam echo sounder SEABAT (a preliminary report)

Masakazu Nara, Yoshio Inouchi

2000 Volume 52 Issue 52 Pages 5-12
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.5

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High-resolution, three-dimensional submarine topographic mapping of Kaihara, a shallow marine sandridge, off Nogutsuna Island in the Seto Inland Sea, Japan was carried out using a narrow multibeam echo sounder SEABAT 8101. Through the mapping, two kinds of topographic features suggesting directions of sediment transport, such as subaqueous dunes and obstacle marks, were recognized. The dunes are seen on the southern part of Kaihara and show asymmetrical forms with steeper west-northwestern and northwestern slopes suggesting that the directions of sediment transport are west-northwestward and northwestward. In the northeastern part, three obstacle marks having E-W and WSW-ENE trends are seen to the west and west-southwest of artificial fish-gathering constructions. The directions of sediment transportation in this area are thus westward and west-southwestward. As a large submarine caldron is situated on the east of Kaihara and surface sediments become finer from the caldron to Kaihara, the sediments comprising the Kaihara sandridge are interpreted to have transported from the caldron by tidal currents, which are known as most likely agents of sediment transportation in the Seto Inland Sea, and accumulated where the currents dispersed and lost their energy.

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Comparison of origin and mineralogy between clay fractions of lime muds recovered from the Arabian Gulf lagoons and from the Taketomi Island intertidal flats

Satoshi Yamamoto, Kazukiyo Oshima

2000 Volume 52 Issue 52 Pages 13-23
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.13

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Lime muds and similar kinds of carbonate sediments obtained from the Arabian Gulf regions and from Taketomi Island were isolated into clay and silt fractions and their carbonate mineralogy was investigated by X-ray diffraction (XRD). Two types of lime muds were recognized in the Arabian Gulf lagoons. Aragonite rich lime muds were found in the lagoon near Abu Dhabi. In this mud the concentration of aragonite increases in the clay fraction than the silt fraction. On the other hand, high-Mg calcite (HMC) rich lime muds were found in the lagoon in the Mubarraz shoal. In this mud the concentration of HMC always increases in the clay fraction than the silt fraction. At offshore area of the Arabian Gulf, the lime mud supplied from the coastal lagoons is diluted by low-Mg calcite (LMC) coccolith ooze. In the Taketomi Island samples, it is already known that the underlying coral reef limestones contain numerous patches of lime clay in which HMC is enriched and the HMC lime clay may be supplied to the overlying lime mud by erosion. Similarly, in the Mubarraz shoal lagoon the HMC enriched clay fractions of the lime mud may be supplied from the lime clay enclosures contained in the surrounding coral reefs.

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Vital effects and re-equilibration recorded in isotopic composition of crinoids and coralline algae

Hiroshi Oda

2000 Volume 52 Issue 52 Pages 25-31
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.25

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Biogenic carbonate often records isotopic composition disequilibrium to that of seawater. The author measured carbon and oxygen isotopic composition of the Holocene crinoids and the Holocene coralline algae. These data imply that exchange and re-equilibration of isotopic composition exist between biogenic carbonate and seawater. Vital effects can be negligible if re-equilibration occurs in the early diagenetic stage after death of these organisms.

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Albitization of feldspars in sandstones from the Upper Mesozoic Myogog Formation, Korea

Kang-Min Yu, Yeong-In Kwon, Jae-Bong Shin

2000 Volume 52 Issue 52 Pages 33-41
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.33

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Sandstones exposed within the Myogog Formation in the Bongwha area, Korea are classified as quartzose arenites/wackes and contain from one to five percent plagioclase with zero to one percent potash feldspar. Electron probe microanalysis, backscattered electron microscopy, cathodoluminescence, and petrographic microscopic study of feldspars in sandstones of the Myogog Formation show that many of the feldspars consist of albite. Most of this albite has moderately high chemical purity (Ab 96.8-100) and does not display cathodoluminescence. These characteristics suggest that the albite is authigenic, formed during burial diagenesis by alteration of plagioclase and K-feldspar. Because feldspars are particularly susceptible to albitization at temperatures exceeding about 90°C, the presence of abundant authigenic albite in the Myogog Formation indicates that it must at one time has been buried deeply enough to undergo temperatures of this magnitude.

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An implication of depositional environments with reference to maceral compositions from the Pliocene and Pleistocene sediments in the Higashikubiki Hills, Niigata Prefecture, central Japan

Akiko Omura, Daisuke Ikedzu, Koichi Hoyanagi

2000 Volume 52 Issue 52 Pages 43-52
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.43

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Maceral compositions vary in sedimentary rocks under the influences of sedimentary environments, transport processes and relative sea-level changes. This paper characterizes the relationship between maceral compositions and depositional systems, such as fluvial, estuary and shelf-shoreface on the basis of facies analysis of the Pliocene to Pleistocene Uonuma Group and the Pleistocene Haizume Formation distributed in the Higashikubiki Hills, Niigata Prefecture. Maceral composition in shelf-shoreface system is characterized by abundant vitrinite and NFA (non-fluorescent amorphous kerogen), while estuary system sediments are characterized by abundant sporinite and cutinite. This evidence shows that sporinite and cutinite are deposited in an enclosed estuary system. Macerals of fluvial system sediments are composed mainly of terrigenous macerals of kerogen, such as vitrinite, sporinite and cutinite with very rare NFA. NFA might be formed from some terrigenous organic matter under an influence of sea water, since its concentration increases gradually from the fluvial to the marine environment.

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Transgressive barrier island deposits of the Pleistocene Tanabu Formation in the Shimokita Peninsula, northern Japan

Maki Ishida, Kotaro Kamada

2000 Volume 52 Issue 52 Pages 53-62
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.53

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The Middle Pleistocene Tanabu Formation is exposed in seacliffs along the northern coast of the Shimokita Peninsula in Northeast Japan. The formation was divided into two members by Kuwano (1957) as follows: the upper part of the formation (the Ishimochinaya Member) and the lower part of the formation (the Shiosaki Member). This paper investigated the Ishimochinaya Member at Inasaki on the coast from the sedimentological point of view. Estuarine and Barrier island depositional systems are recognized in the formation at Inasaki. The Barrier island depositional system consists of foreshore-shoreface, tidal channel-fill and lagoonal sedimentary fades. The foreshore-shoreface sedimentary facies are repeatedly incised by tidal channel-fill sedimentary facies in the surveyed section. Therefore barriers in the formation correspond to a wave-dominated barrier in microtidal environments. The temporal and spatial distribution of these fades associations suggests that the barrier island depositional system of the formation was formed under transgrssive conditions during a relative sea-level rise in the Middle Pleistocene.

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Spit-bay depositional system recognized in the Yabu Formation, Shimosa Group in the Kisarazu Plateau, Chiba Prefecture, Japan

Hiroko Okazaki, Hiroyuki Sato, Hiroomi Nakazato, Takanobu Kamataki

2000 Volume 52 Issue 52 Pages 63-74
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.63

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The middle Pleistocene Yabu Formation, Shimosa Group distributed in the Shimosa Plateau is deposits of Paleo Tokyo-Bay. The investigation area, Kisarazu Plateau is located at the most southern part of the Shimosa Plateau and also the southern margin of Paleo Tokyo-Bay. The Yabu Formation is mainly composed of sands, and alternation of sands and muds, We exhibit the distribution of Yabu Formation at the Kisarazu Plateau, using intercalated volcanic ashes and examining a depositional system by fades analysis.
As a result, spit-bay depositional system was reconstructed at the heads of Paleo Tokyo-Bay from the shape of basin and facies distribution of the formation. In addition, the change of depositional system in the Yabu Formation was considered. Consequently, the depositional sequence corresponding to a glacio-eustatic sea-level change was recognized in the formation, and it became clear that the spit developed dung taransgression associated with interglacial period and the bay was filled and diminished during subsequent sea-level lowering.

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Leaders in sedimentology in its early years (IV-Final)

Hakuyu Okada

2000 Volume 52 Issue 52 Pages 75-83
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.75

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Invitation to the sedimentological tank ‘Margi-3’

Tetsuji Muto

2000 Volume 52 Issue 52 Pages 85-87
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.85

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Report on the Fifth International Conference on Tidal Environments (Tidalite 2000)

Toshiyuki Kitazawa, Norihiko Sakakura, Susumu Tanabe

2000 Volume 52 Issue 52 Pages 95-99
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.95

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Report from Field Trip of the 2000 Annual Meeting of the Sedimentological Society of Japan

Kyoko Kataoka

2000 Volume 52 Issue 52 Pages 101-103
Published: December 25, 2000
Released on J-STAGE: May 27, 2010

DOIhttps://doi.org/10.4096/jssj1995.52.101

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