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対州鉱山附近の対州層群にみられる流痕について


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Title: 対州鉱山附近の対州層群にみられる流痕について
Other Titles: On the sole marks of the Taishu Group in the Taishu mine and adjacent area
Authors: 高橋, 清 / 松橋, 秀郎
Authors (alternative): Takahashi, Kiyoshi / Matsuhashi, Shuro
Issue Date: 25-Dec-1970
Citation: 長崎大学教養部紀要. 自然科学. 1970, 11, p.41-53
Abstract: Many sole marks consisting of the longitudinal current ridge marks and small flute-like marks, were found on the upper and lower surfaces between the mudstone and sandstone beds in the galleries of the Taishu mine. In the Taishu mine area, there are three sandstone beds, viz. the Tsurue, Senninmabu, and Nimyaku; and two fault systems, viz. one is the N-S normal fault, and the other is the NE-SW reverse fault along the bedding plane between the mudstone and sandstone beds. These faults are important, as they are in close connection with the ore deposits. Many galleries extend along the bedding plane which forms the hanging wall of the gallery consisting of the sandstone bed. The reverse fault plane of the strike direction appears more often in the 3 to 5 mm lower horizon, than on the surface of the mudstone bed. Accordingly the authors have often found thin mudstone plates adhering to the bottom surface of the sandstone bed forming the hanging wall, which dips generally 30 to 40 degrees southeastward. The casts of the sole marks occur on the upper surface of these thin mudstone plates, and the moulds on the lower surface of the sandstone bed. The longitudinal ridge marks consist of narraw hollows and ridges. The hollows range from 3 to 10 mm in width; several mm to 7 cm in length; and about 1 mm in depth. According to DZULYNSKI's experiment, such marks are formed by a less turbulent and more regular flow of water. The small flute-like mark is found on the bottom surface of the Nimyaku sandstone bed. The small rounded mark is 1 to 5 mm in diameter, and the connecting mark is 1 to 2 cm in length. Its height is about 1 mm. Averages of twenty five directions of sole marks and bedding planes on the bottom surface of the Senninmabu sandstone bed are respectively N 70° E, dip 24° and N 30° E, dip 36° E. The average direction of sole marks becomes N 75° E, when the dip of the bedding plane is made 0 degrees (see text-fig. 7). The average strike and dip of the bedding planes of the Tsurue sandstone beds at twenty localities is N 36° E and dip 34° E, and the average directions of the sole marks are N20° E and N 50° E. They show N 17° E and N 53° E when converted to the horizontal (see text-fig. 8). A water-current ripple mark has been found on the upper surface of the predominantly sandstone bed at Are-Oku. The water current direction shows S 20° E, dip 46° and the bedding plane is strike N 38° E and dip 53° E. The direction of the water current becomes S 32° E when converted to the horizontal (see text-fig. 9). The sole marks may have been formed by water flowing from the coast seaward and the water-current ripple mark by tidal currents flowing parallel to the coast line.
URI: http://hdl.handle.net/10069/16471
ISSN: 02871319
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 11

Citable URI : http://hdl.handle.net/10069/16471

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