Annals of the Tohoku Geographical Association
Online ISSN : 1884-1244
Print ISSN : 0387-2777
ISSN-L : 0387-2777
Volume 39, Issue 4
Displaying 1-8 of 8 articles from this issue
  • Mahito ITO, Tomoyuki MASAKI
    1987 Volume 39 Issue 4 Pages 247-267
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The authors investigeted in detail the glacial landforms in the area around Mt. Harinoki (2, 820.6m) and Mt. Renge (2, 798.7m), through field surveys and aerophoto-interpretation. Judging from the location of terminal moraines, outwash terraces, trough edges, glacial polishes, and the difference of dissection of glacial landforms, four glacial stades were recognized. They were named, from the older to the younger, Harinoki I, II, III and IV stades respectively. The Harinoki I stade corresponds to a maximum glacial extent in this area, when several glaciers extended to about 1, 600 or 1, 700m a. s. l.
    The distribution of glaciers in each stade indicateds that the glacier extended more on the northern slope than on the southern slone in every stade. The mean altitude of orographic snowline on both slopes was estimated by using the Brückner's method. It was higher on the northern slope than on the southern slope in the I and II stades, while it was lower on the former than the latter in the III and IV stades.
    By comparing the orographic snowline of each stade in this area to that in the Yari-Hotaka Mountain Range (Ito, 1982), the difference of air temperature in two areas was estimated as follows; The mean annual air temperature in this area is lower than in the Yari-Hotaka Moutain Range of about 0.4°C in the I stale (the Takitani stade), 0.5°C in the II stade (the Yaridaira stade), 0.9°C in the III stade (the Hidazawa stade I), and 1.0°C in the IV stale (the Hidazawa stade II) respectively. The value in the younger stade, for in the IV stade, is similar to the value at present (1.2°C).
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  • Yoshinori OTSUKI
    1987 Volume 39 Issue 4 Pages 268-282
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    This paper describes the characteristics of the marker-tephras in the tephra sequence overlain by the Medeshima Pumice layer and the relationships between the markers and the geomorphic surfaces in the area to the south of Sendai.
    Five marker-tephras are found in the tephra sequence overlain by the Medeshima Pumice. They are named Tsubonuma-1 Pumice layer (TbP 1), Tsubonuma Lithicfragments layer (Tblf), Tsubonuma-2 Pumice layer (TbP 2), Tsubonuma-3 Pumice layer (TbP 3), and Tsubonuma-4 Pumice layer (TbP 4), in ascending order. The marker-tephras are identified by both chemical analysis of ferromagnetic minerals and X-ray diffraction data. In chemical composition of ferromagnetic minerals, TbP 1 and Tblf are of andesitic to dacitic, and TbP 2 is of rhyolitic, while TbP 3 and TbP 4 are of dacitic.
    Both the isopack maps and petrographic characteristics indicate that source volcanoes of TbP 1 and Tblf are inferred to be around the Aoso and the South Zao volcanoes, while those of TbP 2 and TbP4 to be in the areas extending from the north Zao to the Funagata Ranges. Moreover the relationships between the marker-tephras and geomorphic surfaces make clear that the Aobayama Surfaces are divided at least into the following two groups of different ages: the Aobayama I and II surfaces and the Aobayama III and IV surfaces, and that the hill-top surfaces of the Motoisago Hills and the Medeshima Hills are older than the Aobayama Surfaces.
    The five marker-tephras overlying the surfaces as above are considered to be of mid-Pleistocene age.
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  • Hidetsugu YAMANAKA, Hiroshi YAGI
    1987 Volume 39 Issue 4 Pages 283-301
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    River terraces, including accumulation terrace, were investigated in the Iide and Asahi Mountains. This paper especially describes the terraces of the Last Glacial age on the basis of stratigraphical, geomorphological and pedological evidences as well as 14C age determination.
    The results are summarized as follows.
    1) In the studied river basins, such as the Miomote, the Arakawa, the Tamagawa, the Tainai and the Kajikawa Rivers, two accumulation stages in the Last Glacial age were detected. The accumulation and the following incision are considered to have been caused by the climatic changes.
    2) The earlier and the later accumulation stages terminated at least before 35, 000yr B. P. and before 12, 000yr B. P., respectively.
    3) The earlier accumulation terrace are widely distributed along the middle courses of rivers, although not in the upper valleys. The latter one are formed only in the upper valleys in the Mountains and at the outlets of gorges through high mountain area. These facts indicate that the earlier accumulation is more conspicuous than the later one.
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  • Minoru YOKOO
    1987 Volume 39 Issue 4 Pages 302-315
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Hirosaki has been a central city in Aomori Prefecture since the Tsugaru family based their government there in the 1610s. The aim of the present paper is to show how the current land-use pattern of this old castle town has been conditioned by that of feudal period. After the preparation and comparative examination of the six land-use maps representing each of the six distinctive stages of the town's development, the following zonal differentiation has been established regarding the area within the feudal town site:
    1) Zones with no functional change.
    2) Zones with increased functional intensity.
    3) Zones with partial functional change.
    4) Zones with total functional change (historically conditioned).
    5) Zones with total functional change (historically unconditioned).
    The land-use pattern of the feudal town is thus reflected on the current townscape of Hirosaki.
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  • Akihiko CHIBA
    1987 Volume 39 Issue 4 Pages 316-326
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
  • 1987 Volume 39 Issue 4 Pages 327-329
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (506K)
  • 1987 Volume 39 Issue 4 Pages 329
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (156K)
  • 1987 Volume 39 Issue 4 Pages 329a
    Published: October 15, 1987
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    Download PDF (156K)
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