釧路炭田の節理系

星野 一男

doi:10.3720/japt.28.238

釧路炭田の節理系

星野一男

著者情報

ジャーナルフリー

1963 年 28 巻 6 号 p. 238-245

DOI https://doi.org/10.3720/japt.28.238

詳細

発行日: 1963/11/30 受付日: - J-STAGE公開日: 2008/03/27 受理日: 1963/09/06 早期公開日: - 改訂日: -
訂正情報
訂正日: 2008/03/27 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : The Kushiro coal field consists of Oligocene sedimentary rocks, ranging from 800 to 2000m in thickness. Major structural features are N-S folds and northeastward-trending faults, Probably the folds are older than the faults.
The method of study is as follows. Thirty nine localities were selected throughout the coal field ss shown in Figure 1; 35 in compact, massive shale of Charo formation and 4 in Nuibetsu or Shakubetsu formation. At each locality, 100 joints, except at a few localities, were measured, then they were plotted in the lower hemisphere of the Schmidt Net, and contour lines were drawn to find areas of concentration. These 39 Schmidt Net diagrams are shown in Figures 2, 3, and 4.
Then concentration more than 6 % in the peak was collected from these 39 diagrams and plotted in other Schmidt nets as shown in Figure 5, in order to study geometrical relation between joints and the major structural features.
In conclusion, there are three conspicuous groups of joints, C, R, and A.
Joints of C group have a mean plane that strikes from east to west and dips nearly vertically. They were probably formed by E-W lateral compression, the same stress which caused the N-S folds. Joints of R group are possibly related to NE faults. Except in area (1), R is divided into two parts, Rl and R2. R1 and R2 are considered to be conjugate shear fractures. Axes of principal stress in areas (2), (3), and (4) are given in Table 2 and Figure 5. In every area, axis of maximum principal stress is nearly perpendicular to the planes of NE fault concerned.
Joints of A group are a consequence of failure in folding, either of N-S folds or of NE folds along the NE faults. They trend in parallel with the folding axes and dip nearly at right angle to the bedding.
Right : The Kushiro coal field consists of Oligocene sedimentary rocks, ranging from 800 to 2000 m in thickness. Major structural features are N-S folds and northeastward-trending faults, Probably the folds are older than the faults.
The method of study is as follows. Thirty nine localities were selected throughout the coal field ss shown in Figure 1; 35 in compact, massive shale of Charo formation and 4 in Nuibetsu or Shakubetsu formation. At each locality, 100 joints, except at a few localities, were measured, then they were plotted in the lower hemisphere of the Schmidt Net, and contour lines were drawn to find areas of concentration. These 39 Schmidt Net diagrams are shown in Figures 2, 3, and 4.
Then concentration more than 6% in the peak was collected from these 39 diagrams and plotted in other Schmidt nets as shown in Figure 5, in order to study geometrical relation between joints and the major structural features.
In conclusion, there are three conspicuous groups of joints, C, R, and A.
Joints of C group have a mean plane that strikes from east to west and dips nearly vertically. They were probably formed by E-W lateral compression, the same stress which caused the N-S folds.
Joints of R group are possibly related to NE faults. Except in area (1), R is divided into two parts, R₁ and R₂. R₁ and R₂ are considered to be conjugate shear fractures. Axes of principal stress in areas (2), (3), and (4) are given in Table 2 and Figure 5. In every area, axis of maximum principal stress is nearly perpendicular to the planes of NE fault concerned.
Joints of A group are a consequence of failure in folding, either of N-S folds or of NE folds along the NE faults. They trend in parallel with the folding axes and dip nearly at right angle to the bedding.

訂正日: 2008/03/27 訂正理由: - 訂正箇所: 引用文献情報訂正内容: 訂正前 : 1) 橋本亘,三谷勝利,吉田尚,織田精徳(1959):5万分の1地質図幅"本別"および説明書,北海道開発庁.
2) 星野一男(1962):地層中のFracture空隙率の求め方,および埼玉県比企丘陵第3紀層についての計算例,石油技術協会誌,27巻5号.
3) 井上英二,鈴木泰輔(1963):5万分の1地質図幅"ウコタキヌプリ山"および説明書,北海道開発庁.
4) 三谷勝利,小山内煕,橋本亘(1958):5万分の1地質図幅"足寄太"および説明書,北海道開発庁.
5) 水野篤行,百石浩(1960):5万分の1地質図幅"雄別"および説明書,北海道開発庁.
6) 水野篤行(1963):5万分の1地質図幅"阿寒"および説明書,北海道開発庁.
7) 日本石炭協会北海道支部(1953):北海道炭田誌,第2号"釧路炭田",北海道支部.
8) 織田精徳,根本隆文,植村武(1959):5万分の1地質図幅"常室"および説明書.
9) 佐藤茂,長浜春夫,吉田尚(1960):5万分の1地質図幅"上茶路"および説明書,北海道開発庁.
10) 鈴木泰輔(1958):5万分の1地質図幅"白糠"および説明書,北海道開発庁.
11) 棚井敏雅(1957):5万分の1地質図幅"音別"および説明書,北海道開発庁.

訂正後 : 1) 橋本亘,三谷勝利,吉田尚,織田精徳(1959): 5万分の1地質図幅“本別”および説明書,北海道開発庁.
2) 星野一男(1962): 地層中のFracture空隙率の求め方,および埼玉県比企丘陵第3紀層についての計算例,石油技術協会誌, 27巻5号.
3) 井上英二,鈴木泰輔(1963): 5万分の1地質図幅“ウコタキヌプリ山”および説明書,北海道開発庁.
4) 三谷勝利,小山内煕,橋本亘(1958): 5万分の1地質図幅“足寄太”および説明書,北海道開発庁.
5) 水野篤行,百石浩(1960): 5万分の1地質図幅“雄別”および説明書,北海道開発庁.
6) 水野篤行(1963): 5万分の1地質図幅“阿寒”および説明書,北海道開発庁.
7) 日本石炭協会北海道支部(1953): 北海道炭田誌,第2号“釧路炭田”,日本石炭協会北海道支部.
8) 織田精徳,根本隆文,植村武(1959): 5万分の1地質図幅“常室”および説明書.
9) 佐藤茂,長浜春夫,吉田尚(1960): 5万分の1地質図幅“上茶路”および説明書,北海道開発庁.
10) 鈴木泰輔(1958): 5万分の1地質図幅“白糠”および説明書,北海道開発庁.
11) 棚井敏雅(1957): 5万分の1地質図幅“音別”および説明書,北海道開発庁.

訂正日: 2008/03/27 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

訂正日: 2008/03/27 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : The Kushiro coal field consists of Oligocene sedimentary rocks, ranging from 800 to 2000 m in thickness. Major structural features are N-S folds and northeastward-trending faults, Probably the folds are older than the faults.
The method of study is as follows. Thirty nine localities were selected throughout the coal field ss shown in Figure 1; 35 in compact, massive shale of Charo formation and 4 in Nuibetsu or Shakubetsu formation. At each locality, 100 joints, except at a few localities, were measured, then they were plotted in the lower hemisphere of the Schmidt Net, and contour lines were drawn to find areas of concentration. These 39 Schmidt Net diagrams are shown in Figures 2, 3, and 4.
Then concentration more than 6% in the peak was collected from these 39 diagrams and plotted in other Schmidt nets as shown in Figure 5, in order to study geometrical relation between joints and the major structural features.
In conclusion, there are three conspicuous groups of joints, C, R, and A.
Joints of C group have a mean plane that strikes from east to west and dips nearly vertically. They were probably formed by E-W lateral compression, the same stress which caused the N-S folds.
Joints of R group are possibly related to NE faults. Except in area (1), R is divided into two parts, R₁ and R₂. R₁ and R₂ are considered to be conjugate shear fractures. Axes of principal stress in areas (2), (3), and (4) are given in Table 2 and Figure 5. In every area, axis of maximum principal stress is nearly perpendicular to the planes of NE fault concerned.
Joints of A group are a consequence of failure in folding, either of N-S folds or of NE folds along the NE faults. They trend in parallel with the folding axes and dip nearly at right angle to the bedding.
Right : The Kushiro coal field consists of Oligocene sedimentary rocks, ranging from 800 to 2000m in thickness. Major structural features are N-S folds and northeastward-trending faults, Probably the folds are older than the faults.
The method of study is as follows. Thirty nine localities were selected throughout the coal field ss shown in Figure 1: 35 in compact, massive shale of Charo formation and 4 in Nuibetsu or Shakubetsu formation. At each locality, 100 joints, except at a few localities, were measured, then they were plotted in the lower hemisphere of the Schmidt Net, and contour lines were drawn to find areas of concentration. These 39 Schmidt Net diagrams are shown in Figures 2, 3, and 4.
Then concentration more than 6% in the peak was collected from these 39 diagrams and plotted in other Schmidt nets as shown in Figure 5, in order to study geometrical relation between joints and the major structural features.
In conclusion, there are three conspicuous groups of joints, C, R, and A.
Joints of C group have a mean plane that strikes from east to west and dips nearly vertically. They were probably formed by E-W lateral compression, the same stress which caused the N-S folds.
Joints of R group are possibly related to NE faults. Except in area (1), R is divided into two parts, R₁ and R₂. R₁ and R₂ are considered to be conjugate shear fractures. Axes of principal stress in areas (2), (3), and (4) are given in Table 2 and Figure 5. In every area, axis of maximum principal stress is nearly perpendicular to the planes of NE fault concerned.
Joints of A group are a consequence of failure in folding, either of N-S folds or of NE folds along the NE faults. They trend in parallel with the folding axes and dip nearly at right angle to the bedding.

訂正日: 2008/03/27 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

抄録

The Kushiro coal field consists of Oligocene sedimentary rocks, ranging from 800 to 2000m in thickness. Major structural features are N-S folds and northeastward-trending faults, Probably the folds are older than the faults.
The method of study is as follows. Thirty nine localities were selected throughout the coal field ss shown in Figure 1: 35 in compact, massive shale of Charo formation and 4 in Nuibetsu or Shakubetsu formation. At each locality, 100 joints, except at a few localities, were measured, then they were plotted in the lower hemisphere of the Schmidt Net, and contour lines were drawn to find areas of concentration. These 39 Schmidt Net diagrams are shown in Figures 2, 3, and 4.
Then concentration more than 6% in the peak was collected from these 39 diagrams and plotted in other Schmidt nets as shown in Figure 5, in order to study geometrical relation between joints and the major structural features.
In conclusion, there are three conspicuous groups of joints, C, R, and A.
Joints of C group have a mean plane that strikes from east to west and dips nearly vertically. They were probably formed by E-W lateral compression, the same stress which caused the N-S folds.
Joints of R group are possibly related to NE faults. Except in area (1), R is divided into two parts, R₁ and R₂. R₁ and R₂ are considered to be conjugate shear fractures. Axes of principal stress in areas (2), (3), and (4) are given in Table 2 and Figure 5. In every area, axis of maximum principal stress is nearly perpendicular to the planes of NE fault concerned.
Joints of A group are a consequence of failure in folding, either of N-S folds or of NE folds along the NE faults. They trend in parallel with the folding axes and dip nearly at right angle to the bedding.

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