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Volume 43 (1978)
- Issue 6 Pages 366-
- Issue 5 Pages 269-
- Issue 4 Pages 185-
- Issue 3 Pages 119-
- Issue 2 Pages 53-
- Issue 1 Pages 1-
Volume 43, Issue 3
Displaying 1-8 of 8 articles from this issue
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Tohru YAMANOI1978 Volume 43 Issue 3 Pages 119-127
Published: 1978
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSThe Neogene clastic sediments of the Sado Island are best exposed along the road cutting between Aikawa and Sawane. This district was mapped geologically by SHIMAZU et al. (1972). They divided Neogene strata of this district as follows: The Orito, Tsurushi, Nakayama, and Sawane (Kawachi) Formations in order to upward sequence (Fig. 1).
As shown in Fig. 2, 58 samples have been collected from the sequence covering the Orito to Sawane (Kawachi) Formations. All samples were treated with KOH (10%), HF (47%), HCl+HNO3 (1:1), the acetolysis method, and then a solution of ZnCl2 (sp. gr.: 2.0). In a microscopic examination of each sample, 100 pollen grains were taxonomically classified and 200 pollen grains were identified except for the Pinaceae pollen grains. The pollen analytical diagrams were shown in Fig. 3 and the results obtained are as follows:
(1) The pollen floral zones were recognized in the palynological succession in upward sequence:
A. Carya-Liquidambar pollen zone.
B. Taxodiaceae-Fagus pollen zone I.
(2) A sharp boundary between A and B units is recognized in the middle part of the Nakayama Formation, and is correlated to the lower part of the Funakawa Formation which was name dthe "Funakawa floral change plane" for the pollen stratigraphical horizon in the Oga Peninsula, Northeast Honshu (YAMANOI, 1978).
(3) The writer hopes to propose that the "Funakawa floral change plane" be a time plane for the Neogene successions of the Inner-Northeast Honshu.View full abstractDownload PDF (1832K) -
Takeshi KOMA1978 Volume 43 Issue 3 Pages 128-136
Published: 1978
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSSulfur content of the 435 muddy rock samples from the six exploration wells for coal in the Ashibetsu district, Sorachi region, Ishikari coalfield, central Hokkaido, northern Japan was determined by the modified combustion procedure and coulometric titration analysis (Chromatic S-VK-3B analyser).
It was shown that the marine sedimentary rock had higher sulfur content than fresh-water rock as shown in the followings:
Marine: Average sulfur content %
Akabira Formation Bannosawa Member 0.98
Hachigetsusawa member upper part 0.32
middle part 0.29
lower part 0.43
Bibai Formation 0.38
Wakkanabe Formation 0.48
Fresh-water:
Akabira Formation Aomukaisawa Member 0.08
Yubari Formation 0.06
Horokabetsu Formation 0.09
Noborikawa Formation 0.14
The depositional environment of the sediments determined by the paleontological studies is well coincident with that determined by the sulfur content in the rock. The sulfur content in the rocks shows more clearly the depositional environment compared with the soluble chloride content in the same samples.
Furthermore, it is noticed that the sulfur content in the marine sediments in one formation changes with the thickness of the formation, that is, the thicker the formation the higher the sulfur content at the Ashibetsu district.
Accrding to the facts stated above, it is considered that in the case of the wet type sediments the sulfur content in the sediments is one of the important indicators for the dentification of the dipositional environment, marine or fresh-water.View full abstractDownload PDF (1185K) -
Keinosuke TANIGUCHI, Kaoru IIJIMA, Hiroto KANNO, Tetsuya TSUSHIMA1978 Volume 43 Issue 3 Pages 137-142
Published: 1978
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSThis paper reports the results of laboratory tests made on materials used to prevent loss of circulation of drilling mud. In this study, the well and formation model are used to evaluate the lostcirculation materials. The well model is made of double pipe to test under the circulating of drilling mud.
In the formation model, various size beads and wedge-shaped slots are used respectively to represent increasing permeabilities of formation and opening size of fissure. A bentonite mud is used to suspend 5 to 60 grams per liter of each material tested. Mud tested is circulated through the well and formation model by pump. Following conclutions are obtained.
1) Forty- five of lost-circulation material per liter of mud is the optimum.
2) It is necessary to consider the seal depth to evaluate effect of lost-circulation material in permeable fomation.
3) In granular lost-circulation material, maximum size of particls is equivalent to the size of the openings to be sealed.View full abstractDownload PDF (747K) -
[in Japanese]1978 Volume 43 Issue 3 Pages 143-150
Published: 1978
Released on J-STAGE: March 27, 2008
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[in Japanese], [in Japanese]1978 Volume 43 Issue 3 Pages 151-156
Published: 1978
Released on J-STAGE: March 27, 2008
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[in Japanese]1978 Volume 43 Issue 3 Pages 157-160
Published: 1978
Released on J-STAGE: March 27, 2008
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[in Japanese]1978 Volume 43 Issue 3 Pages 161-167
Published: 1978
Released on J-STAGE: March 27, 2008
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[in Japanese]1978 Volume 43 Issue 3 Pages 168-176
Published: 1978
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSDownload PDF (1099K)
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