GEOLOGICAL STRUCTURE AND HIGH-STANDING DIVIDE FORM IN THE SHIROUMA RANGE, CENTRAL HONSHU, JAPAN
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It has been said that the feature of longitudinal profile of divides are dependent on different rates of erosion controlled by the difference of geological structures i.e.: density of faults and joint fractures, and lithological differences. In this paper, the author has tried to make clear the relationship between the structures and the feature of longitudinal profile of high-standing divides located in the Shirouma Range (2, 300_??_2, 933m), Central Honshu, Japan. He examined the influence of geological structures on the divide form, by measuring the joint density and by making detailed geological maps. The joint density is represented by the number of joints intersecting the circular line of 1m-long on unweathered bedrocks. The joint density was measured at about 300 locations. The relationships between the joint bensity and variations of longitudinal profiles of the divides for different areas are graphically shown in Fig. 2 and Fig. 3, and Table 1 lists them numerically along with sites and lithologies. The altitude of divides becomes lower with the increase of joint density when the intervals between neighbouring locations are 1m to 2m, as illustrated in Figs. 2-a_??_e. The same relationshipalso exists for measuring-interval of 4m to 20m as shown in Figs. 2-f_??_h. Such relationship cannot be recognized, however, when the intervals are increased to 30m to 112m, as shown Figs. 2-i_??_k, Figs. 3-I and II. From these examinations, it can be concluded that the small-scale undulation of the longitudinal divide form with horizontal distances of shorter than 20m are strengly controlled by the difference of the joint density, but the large-scale undulation with horizontal distances of longer than 20m seems to be dependent not on the joint density but on the other geological structures.
- The Association of Japanese Geographersの論文
The Association of Japanese Geographers | 論文
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