巻号一覧
48 巻 (1994)
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48 巻, 6 号
選択された号の論文の6件中1～6を表示しています
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Yoshihiro Sawada, Allah B. Kausar, Kazuya Kubo, Yuhei Takahashi, Yutak ...原稿種別: Article
1994 年 48 巻 6 号 p. xxxiii-xxxviii
発行日: 1994/11/25
公開日: 2017/06/06
ジャーナル オープンアクセスPDF形式でダウンロード (1462K) -
岡山県南西部,中新統浪形層の基底不整合森山 和道, 矢野 孝雄, 沖村 雄二, 瀬戸 浩二原稿種別: 本文
1994 年 48 巻 6 号 p. 509-520
発行日: 1994/11/25
公開日: 2017/06/06
ジャーナル オープンアクセスThe Miocene Namigata Formation, which accumulated in the Setouchi Province (an intra-arc basin of the southwest Japan arc), has a marine erosional landform preserved on the basal unconformity. The landform is a staircase rocky coast composed of wave-cut terraces and sea cliffs. This paper describes the gravelly sediments intercalated in the formation and reconstructs the processes responsible for the marine erosional landform. The marine erosional landform formed through the repetition of the following cycle, which was controlled by pulsatile, but consistent rising of relative sea level. 1) After a rapid rise of relative sea level, a new sea cliff created at stillstand sea level collapses due to marine erosion, resulting in the generation of a wave-cut terrace. 2) Debris flows from the collapse run down the old sea cliff drowned through the rapid rise of relative sea level, and accumulate as a submarine scree at the foot of the cliff. 3) Subsequent retreats of the active sea cliff widen the wave-cut terrace, abrasion of which degrades the collapsed debris from the sea cliff. 4) By wave and current action, clastic material transported from the wave-cut terrace and from rivers covers the submarine scree and forms a wave-built terrace on the seaward side of the wave-cut terrace. 5) Further supply of sand elevates the surface of the wave-built terrace to the level of the wave-cut terrace, resulting in a state of equilibrium at the surf zone. 6) Another rapid rise of relative sea level sets up the next cycle. The marine eroional landform preserved on the basal unconformity of the Namigata Formation is, thus, a product of the pulsatile rising of relative sea level on a rocky coast. In terms of sequence stratigraphy, the formation seems to be a parasequence set forming a transgressive systems tract.抄録全体を表示PDF形式でダウンロード (1559K) -
角礫岩層の特徴と堆積過程秩父盆地新第三紀団体研究グループ原稿種別: 本文
1994 年 48 巻 6 号 p. 521-533
発行日: 1994/11/25
公開日: 2017/06/06
ジャーナル オープンアクセスThe Early to Middle Miocene deposits are distributed in the Chichibu basin in the northeast of the Kanto Mountains. The Yokoze-macni Group which intercalates some thick conglomerate beds, occupies the uppermost part of the Miocene deposits. The characteristics of the conglomerate beds and their sedimentation process are as follows: (1) Five conglomerate bodies have been recognized in the Yokoze-machi Group. They are Lower Sekinoiriya, Upper Sekinoiriya, Nakago, Une and Karugome conglomerate bodies respectively, in ascending order. (2) The four conglomerate bodies, Lower and Upper Sekinoiriya, Nakago, and Karugome, are composed mainly of angular clasts of sandstone and slate derived from the basement rocks. These conglomerate bodies tend to be thicker toward the east, suggesting that much of detritus was supplied from the basement rocks wich distribute to the east of the basin and is presently in fault contact with the basin-fill. (3) The Une conglomerate body is composed mainly of angular gravels of sandstone and mudstone derived from the Neogene deposits. These angular gravels were probably supplied from southern (southwestern) or northern (northwestern) areas in the basin. (4) The conglomerates containing many angular gravels derived from basement rocks are supposed to have been deposited from subaqueous debris flows or other high-energy flows in the shallow-water embayment, 10 to 100m deep.抄録全体を表示PDF形式でダウンロード (2512K) -
上岩橋層と木下層の堆積相,層序,古環境(その1)竜ヶ崎団体研究グループ原稿種別: 本文
1994 年 48 巻 6 号 p. 535-551
発行日: 1994/11/25
公開日: 2017/06/06
ジャーナル オープンアクセスThe Middle to Late Pleistocene Shimosa Group distributed in the southern Inashiki Upland, Kanto Plain, is mainly composed of sand and mud which were deposited under shallow marine conditions. On the basis of sedimentary facies of the Group, seven sedimentary environments were recognized, that is, transgressive zone (foreshore-shoreface), inner shelf, lower shoreface, upper shoreface, shoreface, foreshore and estuarine channel. The authors have made it clear that the Shimosa Group in this area consists of two cycles of sedimentation, each of them was formed by the sea-level change. The lower one is the Kamiiwahashi Formation and the upper, the Kioroshi Fomation. There are transgressive zones (foreshore-shoreface) at the base of both Formation, and the sedimentary facies successions above inner shelf faceis on the transgressive zones (foreshore-shoreface) are considered the progradational succession. The depth of the sea which has formed the Kamiiwahashi Formation is 9 meters and that of the Kioroshi Formation is 6 meters. These values minus the thickness of inner shelf facies, which is 1 meter, leaves the depth of the mud line. If this depth compared with that of the mud line of Japan's present bays, the Kamiiwahashi Formation can be considered to have been deposited on an open bay like Ishikari Bay; on the other hand, the Kioroshi Formation on an inner bay like Tokyo Bay or Osaka Bay. The Kamiiwahashi Formation was formed under the rapid transgression and following the progradation of the strand plain system along an open bay, while the Kioroshi Formation was formed also under the rapid transgression but following the progradation of the depositional system of coastal plain (estuarine depositional system) along an inner bay.抄録全体を表示PDF形式でダウンロード (2333K) -
中米グァテマラ国南東部の予察的土壌調査結果からの検討小林 久, Leeroy Gillespie原稿種別: 本文
1994 年 48 巻 6 号 p. 553-564
発行日: 1994/11/25
公開日: 2017/06/06
ジャーナル オープンアクセスThe area studied for agricultural and rural development in the south-estern region of Guatemala, Cenetral America, lies on mountainous plains, dissected hilly lands and coastal plains, and mainly underlain by Volcanic rocks, pyroclastic deposits and alluvil sediments. The soils in the area may be classified into 32 types and can be differentiated into 6 groups considering soil profile development and soil chemical properties; i. e. Red-yellow Soil Group, Brown Soil Group, Heavy Clayey Soil Group, Scoria Soil Group, Andosols Group and Alluvial Soil Group. Alluvial deposits, Tephra deposits of volcanic ash and of layered scoria and Volcanic rock formations are observed as the parent materials of the soils. On the other hand, a few soils which are overlain by tephra and/or volcanic formations (buried osils) are found and could be divided into two (2) types; i. e. Red type and Brown type. Both type are considered to fit in the Soil Classification of the Area. The Red type is correlative with the Red-yellow Soil Group and the Brown type is correlative with the Brown Soil Group. Consequently, both Red-yellow and Brown Soil Groups that are found on the surface in the Area could be considered as relict soils. Through considerations of the relationship among overlying formations of the buried soils, the relict soils on the surface and their parent materials, the units of the Soil Group and its parent material in the Area could be divided into at least four (4) stratigraphical units: Alluvial Soil/Alluvial Deposits Unit, Andsols/Volcam'c Ash and Scoria Soil/Layered Scoria Unit, Brown Soil/Upper Volanic Rocks Unit and Red-yellow Soil/Lower Volanic Rocks Unit. Considering the classification of the stratigraphical units of Soil Group/parent material and the soil development, the development periods of the soils in the Area also are differentiated into four (4) groups: Shortest group of Alluvial Soil, Second shortest Group of Andsols/Scoria Soil, Middle Group of Brown Soil and Longest Group of Red-yellow Soil. In addition, the spatial distributions of the geological formations in the Area are obtained from the Soil Map which refers to the relationship between the stratigraphical units and the Soil Groups, with no complicate process. Thus, the above considerations suggest that the soil survey results could be useful to estimate the volcano-stratigraphy and the distribution of the geological formations.抄録全体を表示PDF形式でダウンロード (1919K) -
堀川 秀夫, 米山 正次, 渡辺 其久男原稿種別: 本文
1994 年 48 巻 6 号 p. 565-570
発行日: 1994/11/25
公開日: 2017/06/06
ジャーナル オープンアクセスPDF形式でダウンロード (1039K)
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