All issues
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 2
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yoshihiro Sawada, Ashraf S Al Jailani, M Rehanul H SiddiquiArticle type: Article
1996 Volume 50 Issue 2 Pages 95-99
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (1969K) -
Kazue Tazaki, Guoping Zhou, Koji MakainoArticle type: Article
1996 Volume 50 Issue 2 Pages 100-110
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSPolluted narcissuses by exhaust emissions derived from a diesel engine twice a day were investigated by XRF, SEM-EDX and TEM analyses. Polluted narcissus was characterized by no flower, deformed leave and the change of color from green to yellow and black. S was increased about 6 times. About 33% of S-coated carbonaceous soots was retained through breath holes by narcissus, causing the normal breath and photosynthesis of narcissus damaged. This could be a major factor of narcissus growing abnormally during a short period (2 months).View full abstractDownload PDF (3065K) -
Masayuki Yamashita, Hiroaki Ishiga, Kaori Dozen, Koutaro Ishida, Makot ...Article type: Article
1996 Volume 50 Issue 2 Pages 111-124
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSOrganic black mudstones and siliceous shales form marker beds of the Earliest Triassic in the bedded chert sequence of Southwest Japan. The organic black mudstones contain a large amount of organic carbon compared with usual bituminous shales. Geochemical analyses were made using X-ray fluorescence and neutron activation methods. This study aims at evaluation of provenance change in relation to accumulation of organic materials in the pelagic environment. The results can be summarized as follows: (1) Organic black mudstones and siliceous shales commonly show enrichment in K_2O, Rb, Cs, Hf, Nb and Th compared to PAAS (post Archean Australian shales). C_s/Rb ratio also shows that organic black mudstones and siliceous shales show similar composition to that of PAAS. (2) TiO_2/SiO_2 ratios in organic black mudstones, are commonly greater than those of siliceous shales. Cr, Y and Zr enrichment coincides with heavy REE (Rare Earth Elements) enrichment in some organic black mudstones indicating possible derivation from basic materials. (3) REE patterns of organic black mudstones exhibit negative Eu anomalies in some cases, but their values are rather smaller than those of silicic volcaniclastics. LREE/HREE ratios vary in vertical section, and obvious middle and heavy REE enrichments appear, due to presence of intermediate to basic volcanic material (4) OIT (oceanic island tholeiite) normalized spider diagram for organic black mudstones and siliceous shales shows similar pattern to those of CFB (continental flood basalt) and PAAS. (5) Depletion in CaO, MnO and Co is a common feature of organic black mudstones and siliceous shales, and is compatible with deposition below the CCD under anoxic conditions. (6) Uranium enrichment in organic black mudstones occurs, due to deposition under anoxic conditions. Although the results indicate local differences in the terrane provenance, organic black mudstones, in general, have an influence of intermediate to basic volcanic materials. Organic black mudstones are usually regarded as products of oceanic stagnation. But in pelagic conditions, organic material was formed by high primary productivity of marine planktons resulting from active upwelling of bottom currents. This points to a synchronous event of activated oceanic conditions in the earliest Griesbachian rapid sea-level rise.View full abstractDownload PDF (1631K) -
Hiroaki Ishiga, Kaori Dozen, Yoshikazu Sampei, Makoto MusashinoArticle type: Article
1996 Volume 50 Issue 2 Pages 125-137
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSVoluminous black mudstone deposition occurred in the narrow and elongated Maizuru Belt of Southwest Japan during the Permian. Geochemistry of these mudstones reflects the provenance of the Maizuru Belt across the Middle and Upper Permian boundary. Proposed provenance of the mudstones suggests derivation from a mature island arc or continental arc. Mudstones of the Maizuru Group show similar composition to PAAS (post-Archean Australian shales), but are enriched in Na and Cs, and other alkaline elements (K, Rb). Among the rare earth elements (REE), negative Eu anomaly is common in samples, and heavy REE are enriched rather than light REE. Although organic carbon contents are less than 1 wt%, the ratios C/N and N/P coincide with Red-fields ratio for marine planktonic organisms. Abrupt change in chemistry occurred at the Middle and Upper Permian boundary with high concentration of sulfur, As and Sb, and depletion in organic carbon and nitrogen, and lower ratio of Th/U and V/(V+Ni). This corresponds to enrichment in Na, and depletion in Eu, Cs, Rb and K. The environmental change across the boundary may be caused by active volcanism, which resulted in an anoxic basin with consequent decline in radiolarian productivity.View full abstractDownload PDF (1408K) -
Barry RoserArticle type: Article
1996 Volume 50 Issue 2 Pages 138-147
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSWhole-rock geochemical data for first-cycle Mesozoic sedimentary suites of New Zealand have been examined using the Al2O3/SiO2-Basicity Index (FeO+MgO/SiO2+Na2O+K2O) diagram of Kumon & Kiminami (1994). Results show the Brook Street and Maitai terranes were derived from immature island arcs (IIA), and the Caples, Pelorus and Waipapa terranes have evolved island arc (EIA) sources. The Murihiku and Torlesse terranes were derived from advanced EIA and mature magmatic arc (MMA) sources. These results are compatible with previous interpretations. The Brook Street and Maitai data, combined with comparison with modern arc volcanic rocks, suggest that the plot could be extended to higher B.I. values. Results for the Caples, Murihiku and Torlesse terranes also demonstrate that considerable variation in sandstone compositions occurs within single terranes as a result of changing arc volcanism, and through provenance variation.View full abstractDownload PDF (1065K) -
Takeshi Kamei, Masao EnomotoArticle type: Article
1996 Volume 50 Issue 2 Pages 148-160
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSIn order to investigate the influence of drainage well on the behaviour of groundwater seepage and pore water pressure in slope, the finite element analyses using saturated-unsaturated seepage were performed on the model slopes of four types soil layers with any given conditions of rainfall and groundwater inflow. The obtained effects of drainage well on the behaviour of pore water pressure in four different types of slopes are discussed by a detailed look at the different types of soil profile, the variation of vector due to rainfall and inflow to the reference section in the slope, and the variation of pore water pressure with elapsed time. In adittion, we made slope stability analyses by using the results of seepage analyses.View full abstractDownload PDF (1707K) -
Akima Collaborative Research GroupArticle type: Article
1996 Volume 50 Issue 2 Pages 161-176
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSVolcanic rocks of the Late Miocene to Pleistocene ages are widely distributed in the eastern area to the border of Gunma and Nagano Prefectures. These volcanic rocks unconformably overlie the Haraichi and Itahana Formations, consisting of the marine sediments of Late Middle Miocene to Early Late Miocene. These volcanic rocks are divided into three formations; Kirizumi, Hanamagari and Iriyamatoge Formations. Kirizumi Formation lied unconformably on the basement complexes which consist of marine sedimentary rocks and is unconformably covered by Hanamagari and Iriyamatoge Formations. The Kirizumi Formation is divided into Kubo Tuff Breccia Member, Usuiko Lava and Tuff Breccia Member, Yunosawa Lava and Tuff Breccia Member, Dozen Lava and Tuff Breccia Member, and Irinoyu Lava and Tuff Breccia Member in ascending order. The lower most part of Kubo Tuff Breccia Member contains many kinds of gravels of amphibolite, schist, gneiss, hornfels, quartz porphyry, chert, sandstone and shale. These metamorphic rocks must have been derived from Ryoke Metamorphic Belt. The Kubo Tuff Breccia Member is composed of rhyolitic and dacitic volcanic deposits which were supplied from Nakaoyama Intrusive Masses. In contract, one remaining members of Kirizumi Formation, and Hanamagari and Iriyamatoge Formations consist of andesitic pyroclastic rocks and lava flows. About thirty intrusive rocks and three hundred dykes were found in the area investigated. They occurred during the sedimentation of the Kirizumi Formation.View full abstractDownload PDF (2294K) -
Toshio KusunokiArticle type: Article
1996 Volume 50 Issue 2 Pages 177-182
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (3394K) -
Toshio Kusunoki, Nobuhiro ImotoArticle type: Article
1996 Volume 50 Issue 2 Pages 183-187
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (1297K) -
Masakazu Hayashi, Yorio MiyatakeArticle type: Article
1996 Volume 50 Issue 2 Pages 188-193
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (1098K) -
correlation with wide-spread tephrasArahama Dune Research GroupArticle type: Article
1996 Volume 50 Issue 2 Pages 194-198
Published: March 25, 1996
Released on J-STAGE: June 06, 2017
JOURNAL OPEN ACCESSDownload PDF (683K)
- |<
- <
- 1
- >
- >|