第3回院生会巡検

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1 院生会野外巡検(第3回ー陸成層 海成層の観察ー 案内者 風呂田 郷史 スケジュール 214年6月28日(土 8: 8: 7:5 北大北18条ロータリー集合 出発 9:3 12:3 (4 三美炭坑 (石狩層群美唄層 陸成層 海成層の観察 14:3 16:3 夕張千鳥ケ滝 (川端層 フォアランド堆積盆性タービダイト堆積物 17: 18: ユンニの湯 (自由時間 夕食 温泉 19:3 9: 2 11:3 帰札 3 14: 予算 2 25円 (4 9:3 12: : 17: (3 12: (1 (4WD 17:3 18:15 写真-1 三美炭坑の美唄層大露頭 図-1 巡検ルート(長谷川ほか 212 写真-2 千鳥ケ滝の川端層大露頭

2 1.三美炭坑(石狩層群美唄層 始新統石狩層群は 北海道中央部の空知-蝦夷帯沿いに発達した前弧堆積盆堆積物である おも に陸成層 汽水層からなり多くの石炭層が夾在する(図1-1 石狩層群は幾春別と三笠 峰延を結 ぶ線(峰延バリアを境界にして南北でその形態と層厚が異なる そのため 北側は空知亜堆積盆 南側は夕張亜堆積盆と分けられる このうち北側の空知亜堆積盆における石狩層群は下位より登 川層 幌加別層 夕張層 若鍋層 美唄層 赤平層 幾春別層 平岸層 る このうち 登川層 夕張層 美唄層 幾春別層 別層に区分されてい 別層が夾炭層となっている 三美炭坑 露天掘り露頭では上記で示した空知亜堆積盆における美唄層を観察することができ る(写真1-1, 図1-2 美唄層はおもに泥岩を主体として 砂岩 砂岩泥岩互層 石炭を挟在する 三美炭坑の美唄層には約1枚の石炭層が存在しており下位より 一番層 二番層 三番下層 三番層 四番層 四番上層 五番 層 五番上層 六番下層 六番層と名称されている 三美炭坑 の美唄層では4次オーダーサイクル(シーケンス:.8-.5Maが 3 認められ 堆積システムは下位より 蛇行河川 氾濫源, 1998; Takano and Waseda, 23 Isk-2 網状-蛇行河川 氾濫源 Isk-3 FP BM2 河口 内湾 沼地 内湾 蛇行河川 氾濫 源 と変化する 観察ポイント ①三美炭坑南露天坑の露頭 四番上層 六番石炭層 後背湿地 沼沢地堆積層 潮汐堆積物 河川チャネル堆積層 Stop1-1 (Hasegawa et al., 写真1-1 三美炭坑南露天坑の露頭 4番上層から6番石炭層までが観察で Stop 1-1 きる(Hasegawa et al.,29 氾濫源堆積層 4次オーダーシーケンス 27 図1-2 図1-1 道央における始新統石狩層群の分布域 (Takano and Waseda, 23 (Takano and Wasera, 23 美唄層柱状図(Inoue et al.,

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4 CH1 CH2 CH3 CH4 Typical column Classification mud silt v f sand fine sand med sand CH5 FP TF1 TF2 TF3 crs sand v c sand granule pebble Schematic block diagram 1cm 1cm 1cm 1cm 1cm Sedimentary structures Interpretation Mechanism Sedimentary environment Trough cross laminated sandstone facies trough cross lamination showing lateral accretion grading channel and point bar (meandering / braided rivers Cross laminated (climbingrippled sandstone facies climbing ripple fine to very fine grained sandstone longitudinal bar point bar (upper part Large scale cross stratified coarse to fine sandstone facies trough cross lamination showing lateral accretion channel and point bar (sandy braided rivers Channelized conglomerate and sandstone facies channel structure trough cross lamination channel and point bar (gravelly braided rivers Channelized massive sandstone facies massive? channel (sandy braided rivers Alternating beds of inverse graded sandstone and coaly siltstone facies inverse grading in sandstone layer rootlet in siltstone layer (flooding, (crevasse spray deposit natural levee flood plain Parallel laminated / current rippled sandstone facies (with herringbone structure parallel lamination partly coaly herringbone structure Corbicula fossil (tidal current tidal flat (sand flat Thin alternating beds of very fine sandstone and siltstone facies shell bed (Corbicula herringbone structure tidal flat (mud flat Channelized sandstone with molluscan fossil facies trough cross lamination current ripple including molluscan fossil (Corbicula / Ostrea mud drape partly coaly flaser bedding (tidal current, tidal channel in tidal flat Association Depositional System MF BF BRAIDED FLUVIAL LA ES BA MEANDERING FLUVIAL LACUSTRINE BAY MARGIN ESTUARINE BAY CENTER BM1 BM2 BM3 M1 Typical column Classification mud silt v f sand fine sand med sand M1' M2 M3 crs sand v c sand granule pebble 1cm 1cm Schematic block diagram 1cm Sedimentary structures Interpretation Mechanism Sedimentary environment Coal muddy coal facies laminated or massive back marsh Dark brown coaly mudstone facies massive or coaly lamination (parallel laminated plant fossil fragment ( back marsh Coaly fragment-bearing massive siltstone facies siltstone : light gray rootlet marsh swamp Massive gray siltstone to muddy siltstone facies (foraminifers-bearing moderately to well sorted no coaly fragment bay estuary Massive gray siltstone to muddy siltstone facies (no foraminifers moderately to well sorted no coaly fragment lake Massive gray siltstone with siderite nodule facies partly layered stratified nodule partly bioturbated (layer parallel (bg. foraminifera bay estuary lake Gray siltstone with varve-like layer facies partly thin alternating beds of coarse siltstone and fine siltstone (several mm order, (tidal current bay estuary (margin

5 Inoue, T., Suzuki, N., Hasegawa, H. and Saito, H., 212: Differential transportation and deposition of terrestrial biomarkers in middle Eocene fluvial to estuarine environments, Hokkaido, Japan. Int. Jour. Coal Geol., 96-97, : Kawakami, G., 213: Foreland Basins at the Miocene Arc-Arc Junction, Central Hokkaido, Northern Japan, INTECH., Chapter6, Muleder, T. and Alexander, J., 21: The physical character of subaqueous sedimentary density fows and their deposits. Sedimentology, 48, Takano, O. and Waseda, A., 23: Sequence stratigraphic architecture of a differentially subsiding bay to fluvial basin: the Eocene Ishikari Group in the Ishikari Coal Field, central Hokkaido, Japan. Sedimentary Geology, 16 (1-3, URL 2-3 (

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