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Volume 50 (1996)
- Issue 6 Pages 427-
- Issue 5 Pages 341-
- Issue 4 Pages 273-
- Issue 3 Pages 203-
- Issue 2 Pages 95-
- Issue 1 Pages 1-
Volume 50, Issue 3
Displaying 1-7 of 7 articles from this issue
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Katsuhiro NakayamaArticle type: Article
1996 Volume 50 Issue 3 Pages 203-206
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
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Yoshihiro Sawada, Dagva Batbold, Hishigsuren EnkhtuvshinArticle type: Article
1996 Volume 50 Issue 3 Pages 207-212
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
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Takeshi KameiArticle type: Article
1996 Volume 50 Issue 3 Pages 213-222
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSThis paper presents an experimental and numerical investigation of the undrained shear characteristics of an undisturbed clay with higher plasticity index (PI=69), using the simple procedure for the undrained shear behaviour of Ko-consolidated cohesive soils estimated by plasticity index. Comparisons were made between the experimental data and the model simulations concerning the undrained triaxial compression and extension loadings, for the purpose of checking the applicability of the analytical results obtained from the adopted model and soil parameters. Reasonable agreement has been obtained between the observed and the computed results of the undrained shear behaviour of the undisturbed clay with higher plasticity index. It is concluded that the applicability of the author's method for the undrained shear behaviour of the undisturbed clay with higher plasticity index is reconfirmed.View full abstractDownload PDF (1011K) -
Masakazu HayashiArticle type: Article
1996 Volume 50 Issue 3 Pages 223-237
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSAbundant insect fossils were obtained from the Early Pleistocene Bushi Formation of the Kazusa Group at Iruma River, Saitama Prefecture, Japan. The formation is distributed in Iruma River and Kaji Hill, western part of the Kanto Plain, and it is divided into five members on the basis of its facies. Many fossils have been reported from some horizons, such as elephants (Stegodon aurorae), plants (Metasequoia disticha, Juglance megasineria etc.), pollen, molluscs and burrows. Insect fossils reported in this paper were collected from the lignite layer intercalated with the uppermost and lowest member. The uppermost member yielded 75 specimens of insect fossils. Most of those fossils were beetles, mainly belonging to the subfamily Donaciine of Chrysomelidae, and are Carabidae, Gyrinidae and another group of Chrysomelidae were also found. The existence of aquatic and marshy beetles, such as Gyrinus sp., Donacia sp. and Plateumaris constricticollis indicate that the paleoenvironment was a swanp accompanied with marshy forests and areas of still water. The lowest member contained numerous insect fossils up to 257 specimens in total. Most of those fossils were also beetles, mainly belong to the subfamily Donaciine of Chrysomelidae, and Carabidae, Gyrinidae, Hydrophilidae, Scarabaeidae, Staphylinidae, Curculionidae and another group of Chrysomelidae were also found. The paleoenvironment of that lowest member was estimated in the following way: Aquatic beetles, such as Gyrinus sp., Donacia (Cyphogaster) sp. and Donacia sp. cf. ozensis indicate the presense of still water accompanied with floating-leaved plants. Marshy beetles, such as Donacia sp. cf. hiurai, Plateumaris sp., Limnobaris sp., Coelostoma sp., Gastrolina peltoidea ? and Linaeidea aenea ? indicate the presense of marshy area of sedges, reeds and marshy trees. The carabidae beetles, such as Calosoma inquisitor ?, Carabus (Ohomopterus) sp. and Carabus (Carabus) ? indicates the presense of forest. The dung beetles, such as Onthophagus sp., Aphodius sp. and Geotrupes sp. indicate the presense of mammals.View full abstractDownload PDF (5245K) -
Barry RoserArticle type: Article
1996 Volume 50 Issue 3 Pages 238-250
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSWhole-rock geochemical data for several recycled sedimentary suites from New Zealand have been examined using the Al2O3/SiO2-Basicity Index (FeO^*+MgO/SiO_2+Na_2O+K_2O) diagram of Kumon and Kiminami (1994). Results show that the recycled sediments have a characteristic position on the Basicity Index (B.I.) plot, at B.I.<0.1 and Al2O3/SiO2<0.1-0.2. Relative degrees of recycling are also revealed. These features suggest that the B.I. plot is also applicable to recycled sediments. Data for contrasting greenschist facies metasedimentary suites derived from the Torlesse and Caples terranes retain original detrital signatures, and can be readily differentiated using a B.I. plot. This and coherent results from a single suite spanning the greenschist and amphibolite facies indicate that the plot can be applied to moderately metamorphosed rocks, provided that the metamorphism is isochemical. Effects of grain size in the fine-to coarse-sand textural range are relatively small, but could result in misclassifications in adjacent fields. In MMA and recycled sediments fractionation between the sand and mud ends of the grain-size spectrum can be extreme. This effect is less marked in EIA and IIA examples. In these cases data from more argillaceous rocks could be applied to the diagram, provided some data is available from sandstones in the same suites to assess the polarity and magnitude of index fractionation.View full abstractDownload PDF (1454K) -
Kikuji MatsuokaArticle type: Article
1996 Volume 50 Issue 3 Pages 251-255
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
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Hiroyuki Mishima, Toshiro Sakae, Yukishige OzawaArticle type: Article
1996 Volume 50 Issue 3 Pages 256-257
Published: May 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (441K)
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