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北海道日東クローム鉱山の鉱床形態

神居古潭帯のクローム鉱床についての研究,第1報

斎藤昌之, 番場猛夫

鉱山地質
1953年 3 巻 7 号 30-39
発行日: 1953/05/10
公開日: 2009/06/12

DOI https://doi.org/10.11456/shigenchishitsu1951.3.30

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In Hokkaido, there are many ultra-mafic igneous bodies along the two parallel tectonic zones which are named the Kamuikotan zone and the Hidaka zone respectively. These tectonic zones composing the geological back-bone of the island, are regarded as the product of Cretaceous orogenic movement which is called the "Hidaka Orogeny". It is believed that Hidaka zone has an orogenic deep core and the Kamuikotan zone is its westward overthrusting zone. Many characteristics of the ultra-mafic igneous rocks are common to both the tectonic zones. But contrasting features have also been observed in them. One of the most disparate features is that the ultra-mafic rocks of the Kamuikotan zone are almost wholly serpentinized, whereas they are always in the unaltered peridotitic state in the Hidaka zone.
It is in the southern part of the great serpentinite belt in the Kamuikotan zone which has long been well-known as a chromite field that the occurrence of lode ore of chromite has been reported.
The Nittoh mine is situated in the southern part of this chromite field.
The geology of the mining district is very complicated, having irregular dome or basin structure of the sedimentary rocks that are belived to be Pre-Cretaceous in age.
From the modes of occurrences, almost all of the chromite deposits are regarded to be deformed secondarily. The deformation is closely related to the secondary structure of the serpentinite, which is regarded to have been caused by the successive movements of the Hidaka orogeny. The serpentinite having primary structure is massive, and retains the characteristic texture of peridotite, even when the olivine is completely altered to serpentine. On the other hand, the deformed serpentinite is in many places foliated.
The primary form of the chromite deposits in the mining area, is plate-like, and is controlled by the joint system of the massive serpentinite. The secondary structures of the deposits are controlled by the block movement of the massive serpentinite or folding of the foliated serpentinites.
In the Nittoh mine, two types of deformation of the chromite deposit are observed.
In this paper, the writers describe the structural characters of each ore mass with special reference to their relations to the intrusive tectonics of the chromite deposits.
Further studies, especially concerning the properties of ores will be published in the near future.
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神居古潭
帯に分布する蛇紋岩の不撹乱状態および再構成粘性土試料の力学特性

三田地利之, 藤澤久子, 和智真太郎, 大河原正文, 工藤豊

日本地すべり学会誌
2003年 40 巻 4 号 293-301
発行日: 2003/11/25
公開日: 2010/06/28

DOI https://doi.org/10.3313/jls.40.4_293

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北海道
神居古潭
帯で採取された蛇紋岩の不撹乱状態および再構成の試料について, 三軸圧縮試験, 繰返し一面せん断試験, 膨潤圧試験, スレーキング試験などの各種力学試験を実施した。試験の結果, 蛇紋岩のピークせん断抵抗角φ'pは不撹乱, 再構成によらず, 31±2゜程度の値をとり, 残留状態のせん断抵抗角φ'rは27～28゜と予想外に大きい。しかし, 蛇紋岩粘性土の非排水せん断強度はダイレタンシー特性の違いから, 不攪乱蛇紋岩の4分の1以下と大幅に低下する。また, 予め葉片に沿って二分し, 試料の表面を磨いた状態での試験結果から得られた葉片に沿う最小のせん断抵抗角は6.5゜を示した。
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37A.
神居古潭
変成岩の⁴⁰Ar-³⁹Ar 年代 : 日本火山学会 1987年度秋季夫会

滝上豊

火山.第２集
1987年 32 巻 4 号 365-
発行日: 1987/12/28
公開日: 2018/02/13

DOI https://doi.org/10.18940/kazanc.32.4_365_2

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36A. 古期アトサヌプリ火山の噴出物について : 日本火山学会 1987年度秋季夫会

隅田まり

火山.第２集
1987年 32 巻 4 号 365-
発行日: 1987/12/28
公開日: 2018/02/13

DOI https://doi.org/10.18940/kazanc.32.4_365_1

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神居古潭
構造帯北部地域産砂クロム中のイリジウム系白金族元素異常

中川充, 納篤, 山本俊一郎, 原田武

資源地質
1995年 45 巻 254 号 401-408
発行日: 1995/12/31
公開日: 2009/06/12

DOI https://doi.org/10.11456/shigenchishitsu1992.45.401

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Platinum-group elements (PGE) in nonmagnetic panned-out detrital samples from the northern Kamuikotan ophi-olitic complex, Hokkaido, was examined by neutron activation method. Their Cl-chondrite normalized PGE patterns are similar to those of ophiolitic host rocks and chromitite. Positive correlation between the iridium and chromium contents imply that iridium-series-PGE anomalies are probably due to chromite-hosted platinum-group minerals. Averaged PGE concentration in the samples from the central Hokkaido (Do-ou) region is almost eight times higher than that from the northern Hokkaido (Do-hoku) region. Based on the chemical analyses and the estimated reserve of chromite, total amounts of PGE included within placer chromite grains are estimated to be 17 kg in the northern Hokkaido, and 245 kg in the central Hokkaido.
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北海道旭川市西方に分布する
神居古潭
変成岩のテクトニクス

*岡本あゆみ, 竹下徹

日本鉱物科学会年会講演要旨集
2011年 2011 巻 T5-P03
発行日: 2011年
公開日: 2012/03/28

DOI https://doi.org/10.14824/jakoka.2011.0.67.0

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　本研究では，
神居古潭
峡谷地域西部と江丹別峠付近を対象にテクトニクスの解析を行った．
神居古潭
峡谷の苦鉄質片岩は緑色片岩相の鉱物組み合わせを示し，シュードセクションよりP = 3.4-4.7 kbar, T = 275-300℃と推定された．さらに石英脈中の流体包有物のアイソコアより，P = 2.5 kbar，T = 300℃の条件を通過したと推定される．また，藍閃石のアクチノ閃石による置換と大量の鉱物脈の存在より，緑色片岩相の変成作用は後退変成作用であり，流体からの熱が変成作用の熱源であったと解釈できる．一方，江丹別峠付近の試料はNa角閃石を多量に含み，粗粒であり組成累帯構造も認められる．角閃石やエピドートの組成累帯構造の分析を行った結果，少なくとも同地域には温度―圧力履歴が温度・圧力上昇，または温度・圧力低下を示す2種類の試料が存在することが明らかとなった．
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カムイコタン

佐藤忠雄

民族學研究
1961年 26 巻 1 号 58-62
発行日: 1961/12/30
公開日: 2018/03/27

DOI https://doi.org/10.14890/minkennewseries.26.1_58

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サハリン島第三系産出の砕屑性クロムスピネルとそのテクトニックな意義

久田健一郎, 久保輝利子, 荒井章司, 小笠原憲四郎

地学雑誌
2000年 109 巻 2 号 281-293
発行日: 2000/04/25
公開日: 2010/11/18

DOI https://doi.org/10.5026/jgeography.109.2_281

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The Upper Oligocene, distributed in the Makarov, Korsakov and Shmidt areas of Sakhalin, yields detrital chromian spinels. These detrital spinels are characterized by extremely low TiO₂ and Fe³⁺ contents, and they were probably derived from highly to moderately depleted mantle peridotite and/or serpentinite (>0.4 in Cr#). The source peridotites are very similar to those now exposed at the Kamuikotan metamorphic belt, Hokkaido, Japan, a possible southern extension of the N-S trending serpentinite melange belts of Sakhalin. It is highly probable that some of their serpentinite bodies had provided detritus of serpentinite and chromian spinel to the sediments. The occurrence of detrital chromian spinels has been reported from the Cretaceous, Paleogene, and Miocene in the axial zone of Hokkaido, indicating that serpentinites were emplaced into the erosional level during these periods. This suggests a protrusion of serpentinite along the N-S trending fault line, probably the extension of some faults in Hokkaido, occurred in late Oligocene as a presage of Miocene transcurrent tectonics in Sakhalin and Hokkaido.
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付加体の構造侵食による前弧の構造発達

植田勇人

地学雑誌
2010年 119 巻 2 号 362-377
発行日: 2010/04/25
公開日: 2010/07/06

DOI https://doi.org/10.5026/jgeography.119.362

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This paper proposes a new model for the evolution of geologic structures in forearcs concerning subduction erosion after tectonic accretion. The model was generated from a high-pressure (HP) metamorphic unit, in which the early history of frontal offscraping accretion is recorded, in the Kamuikotan Zone of central Hokkaido. It was transported from the trench to the interior of the subduction zone during a non-accretionary stage, and the process is regarded to be subduction erosion and subsequent underplating re-accretion at greater depths. This mode of material transport persuasively explains the common and abundant occurrences of terrigenous meta-clastic rocks in HP subduction complexes, in spite of common evidence that sediments had been scraped off at much shallower depths as seen in coeval non-metamorphic accretionary units. It is thus suggested that significant amounts of HP metasediments originated from tectonically eroded materials of the frontal accretionary complex, instead of rocks directly underplated from the subducted slab.
Subduction erosion in Hokkaido occurred contemporaneously with the exhumation of a higher-grade HP unit with similar rates of vertical movement of opposite senses. It suggests that exhumation was a counter flow of subduction erosion: the higher-grade rocks were lifted up by the insertion and accumulation of tectonically eroded rocks at depths, and were unroofed by lateral extension of the oversteepened non-accretionary wedge.
This model can also explain common flat-lying structures of accretionary and subduction complexes exposed on land. They originally had rather high-angle structures formed by lateral shortening during early accretionary stages, and then were tilted trench-ward by the removal of materials near the trench by subduction erosion and their underplating at rear-side portions during the subsequent non-accretionary stages.
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石狩川の最初の治水計画および効果の検証

鈴木英一, 山口里実, 谷育美

土木学会論文集B1（水工学）
2012年 68 巻 4 号 I_1507-I_1512
発行日: 2012年
公開日: 2013/03/26

DOI https://doi.org/10.2208/jscejhe.68.I_1507

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In 1869 the Meiji Government launched the policy of encouraging migration to Hokkaido and started reclamation of the Ishikari River Basin. In September 1898, when farmland reclamation had started to expand, the Ishikari River was hit by an unprecedented heavy flood that resulting in catastrophic damage and 112 fatalities. This disaster prompted surveys for flood control. Okazaki et al. made detailed investigations and observations on the 1904 flood of the Ishikari River. Based on these investigations, a flood control plan focusing on cutoff works was formulated, and those works were implemented for the half-century from 1910. This study reviews the effects of the flood in 1904, which served as the basis for the flood control plan, on the primeval Ishikari River Basin of the time, utilizing the results of investigations by Okazaki et al. We use two-dimensional flood flow numerical simulation to examine the effects of cutoff works. We also explain how the flood control plan had the effect on the basin development.
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泡鳴「断橋」 : その成立と創作主体

鎌倉芳信

日本文学
1987年 36 巻 10 号 62-70
発行日: 1987/10/10
公開日: 2017/08/01

DOI https://doi.org/10.20620/nihonbungaku.36.10_62

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「断橋」は、作者が北海道内を巡歴した時の記事をもとに構成されている。小説では、この記事の上に現実崩壊や存在基底喪失の幻影風景を重ねている。幻影風景は北海道放浪当時の作者の存在の不安や恐怖の変形したものと考えられる。樺太での事業の企ては、自己の哲学の実践であると考えながらも、もしかしたら狂気の沙汰に過ぎないかもしれないというアイデンティティーの危機意識が幻影風景となって表われたものである。
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南部
神居古潭
帯鵡川蛇紋岩体中の白金族鉱物

中川充, 太田英順, 黒沢邦彦

鉱山地質
1991年 41 巻 229 号 329-335
発行日: 1991/10/31
公開日: 2009/12/14

DOI https://doi.org/10.11456/shigenchishitsu1951.41.329

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神居古潭
帯南部の鵡川蛇紋岩体は蛇紋岩化したダナイトとハルツバージャイトが層状構造を作っており,見かけ上厚さ約2mのダナイト層の最下部から白金族元素鉱物が見いだされた.それは長径約50μmで複雑な組織と組成をもっており,その主要な部分は,金属銅に白金族元素(PtとPd)が固溶した合金で,ドメイン構造を示している.このほかに,鉄やニッケルなどと白金族元素(Pt・Pd・Ru・Rh)が合金や硫化物を作る部分がある.また,細粒な含ルテニウムペントランダイトが散在している.これらは,蛇紋岩化に伴う白金族元素の移動を示唆している.
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太平洋北西縁の藍閃石片岩変成作用

黒田吉益

鉱山地質
1970年 20 巻 99 号 43-52
発行日: 1970/03/02
公開日: 2009/06/12

DOI https://doi.org/10.11456/shigenchishitsu1951.20.43

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There are distinct three ages of the glaucophanitic metamorphism in this region from Chukotok to Taiwan; that is, the late-Paleozoic (Devonian-Carboniferous), early- to middle-Mesozoic, and late-Mesozoic. The glaucophane-schist metamorphic belts of the Chukotok-Kamchatka are the Penjinsky belt of the late-Paleozoic, the Pekurinei-Vaejusky and Ganarsky belts of the early- to middle-Mesozoic, and the Karaginsk-Kuronotsuky belt of the late-Mesozoic. They are respectively accompanied by the later metamorphism of the prehnite-pumpellyite facies. For example, the Penjinsky belt of about 330m.y. age has been superimposed by the metamorphism of prehnite-pumpellyite facies of about 180 m.y. age.
The glaucophane schist metamorphic belts of the Japanese islands are the Sangun and the Matsu-gadaira-Motai belts of the late-Paleozoic and the Sanbagawa and Susunai-Kamuikotan belts of the early-middle Mesozoic. They have been also superimposed by the later metamorphism of the prehnite-pumpellyite facies. That of the Taiwan-Ryukyu islands is the Yuli-Ishigaki belt of the early- to middle-Mesozoic.
In these glaucophanic metamorphic belts, dunite-harzburgite series of ultrabasic rock bodies (H-series) or dunite-wehrlite series of ultrabasic rock bodies (W-series) occur, but dunite-lherzolite-pla-gioclase-lherzolite series bodies (L-series) never occurs. Moreover, in one glaucophanitic metamorphic belt only one ultrabasic rock series occurs; for example, W-series in the Sanbagawa, H-series in the Susunai-Kamuikotan and so on. If ultrabasic rocks are the early crystallization products from basaltic melts, the phase diagram of the Di-En system tells us that the H- or W-series may be formed under high pressure in such a belt of gentle thermal gradient as glaucophanitc belts. The L-series may be formed under the region of steep thermal gradient. However, it is not known why the difference of H- and W-series appears in the glaucophane schist metamorphic belts.
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北海道
神居古潭
変成岩類のK-Ar年代

太田努, 榊原正幸, 板谷徹丸

地質学雑誌
1993年 99 巻 5 号 335-345
発行日: 1993/05/15
公開日: 2008/04/11

DOI https://doi.org/10.5575/geosoc.99.335

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G1-01 北海道中央高地ジオパーク構想(ジオパーク,口頭発表)

廣瀬亘

日本火山学会講演予稿集
2014年 2014 巻 G1-01
発行日: 2014/11/02
公開日: 2017/02/10

DOI https://doi.org/10.18940/vsj.2014.0_1

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日本列島の構造発達史とプレートテクトニクス説

木村敏雄

地学雑誌
1977年 86 巻 1 号 54-67
発行日: 1977/02/25
公開日: 2009/11/12

DOI https://doi.org/10.5026/jgeography.86.54

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Many hypothesis have been suggested in Japan, related to the plate-tectonic theory ; (1) “the high pressure metamorphic belts of the Sangun and the Sambagawa were produced within the subduction zones of oceanic plates”, (2) “the so-called ophiolites in the Sangun and the Mikabu zone are of the ancient oceanic crusts”, (3) “the Shimanto terrain was ancient trench area”, (4) “Hokkaido, which has its backbone range with a high pressure metamorphic belt on the continental side and a high temperature metamorphic belt on the oceanic side at present, has been rotated in a 180-degree”, and others. These hypothesis are not well fitted to the geology of Japan. In Honshu, there are no great fault which suggests the ancient boundary between the oceanic and continental plates, and no strata which have the characters of an ancient oceanic crust itself or of those made in the subduction zone of an oceanic plate.
However, geological developments of Japan, in the Sambosan, the Shimanto and later stages, can well be explained by the movemnents of ancient oceanic plates, their positions and the changes of the positions, although many earth movements were produced by up-and-down movements probably related to granite intrusions.
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北海道における地すべり地形の分布からみた地質分帯

山岸宏光, 伊藤陽司

地すべり
1993年 30 巻 2 号 1-9_1
発行日: 1993/09/15
公開日: 2011/02/25

DOI https://doi.org/10.3313/jls1964.30.2_1

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筆者らは4万分の1空中写真判読により北海道全域で12, 843個の地すべり地形を認定し, その分布図を基礎に地質分帯を試みた。結果として, 19地質区に区分し, さらにつぎの4地質帯に要約できた;1) 火山岩地帯, 2) “グリーンタフ” 地帯, 3) 泥岩地帯, 4) 蛇紋岩- “緑色岩” 地帯。
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佐藤博之・秦光男 : 北海道地方, 日本地質図大系2

木村敏雄

地学雑誌
1990年 99 巻 7 号 796a-797
発行日: 1990/12/25
公開日: 2009/11/12

DOI https://doi.org/10.5026/jgeography.99.7_796a

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神居古潭
変成帯幌加内地方の変成分帯

坂野昇平, 羽田野道春

地質学雑誌
1963年 69 巻 815 号 388-393
発行日: 1963/08/25
公開日: 2008/04/11

DOI https://doi.org/10.5575/geosoc.69.388

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神居古潭
峡谷地域の広域変成作用

高山将

岩鉱
1988年 83 巻 5 号 175-190
発行日: 1988/05/05
公開日: 2008/03/18

DOI https://doi.org/10.2465/ganko.83.175

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The Kamuikotan Gorge area, west of Asahikawa, is mainly underlain by the high-pressure Kamuikotan metamorphic rocks. In this area, the Kamuikotan metamorphic rocks form a coherent metamorphic sequence, and are classified into two formations, i. e., the Ino-gawa Green-stone Formation and the Harushinai Pelite Formation. In the latter formation, serpentinites are not uncommon, and sometimes enclose blocks of amphibolites, jadeite+quartz-bearing rocks, and metabasites.
In the Kamuikotan metamorphic rocks, lawsonite, epidote, pumpellyite, glaucophane, actinolite, sodic pyroxene, and chlorite commonly occur. Various mineral assemblages are observed in metabasite, and their stability relations were analyzed by Schreinemakers' method. The petrogenetic grids derived from this method indicate that the Kamuikotan metamorphism of the Kamuikotan Gorge area mainly belongs to a high pressure subfacies of the lawsonite-albite facies, in which aragonite is stable, and that the Harushinai Pelite Formation was metamorphosed at the higher-pressure field than that of the Ino-gawa Greenstone Formation in narrow tempera-ture range. Its metamorphic grade is similar to that of the Horokanai area.
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