Hida Gaien Belt Research Articles

Middle Permian brachiopods from the Tumenling Formation in the Wuchang area, southern Heilongjiang, NE China, and their palaeobiogeographical implications

This paper describes nine brachiopod species in eight genera from the Tumenling Formation in the Wuchang area, southern Heilongjiang, northeast China. The Tumenling fauna is constrained to a Wordian–Capitanian (Guadalupian, Middle Permian) age, based on the correlation of the faunas, and previously published data from the same horizons in the same area. This Middle Permian brachiopod fauna is characterized by an admixture of elements of Boreal affinity ( Kochiproductus sp., Yakovlevia sp., Stenoscisma margaritovi, Gypospirifer volatilis, Spiriferella keilhavii, Spiriferella lita and Alispiriferella neimongolensis), with Palaeoequatorial forms ( Spinomarginifera sp., Vediproductus sp., and Leptodus nobilis). The Wuchang fauna, as a whole, is comparable to several contemporaneous faunas described from Inner Mongolia in northern China, Jilin in Northeast China, South Primorye in eastern Russia, and the Hida Gaien Belt of Japan, in terms of its index elements and its Boreal–Palaeoequatorial mixture. During the Middle Permian these areas (or blocks) were referred to the Inner Mongolia–Japan transition zone or the northern transition zone between the Palaeoequatorial and Boreal Realms. The overwhelming majority of the Boreal elements reveal that the Wuchang area was probably situated in the northern subzone of this transitional zone, which belongs to the southern margin of the Bureya Block. These east and northeast Asian blocks acted as migratory stepping stones bridging faunal migration between the Palaeoequatorial and Boreal realms during the Middle Permian.

On the English expression of the Hida Gaien belt

The Hida belt, one of the Paleozoic-Mesozoic geologic units in central Japan, has been expressed in various ways in English, such as Hida Gaien belt, Hida marginal belt, Circum-Hida terrane, Circum-Hida tectonic zone, etc. When the special issue of this journal entitled Recent progress and future perspective of research on the Hida was edited for publication, as invited editors we recommended the authors to use the expression of Hida belt in order to avoid misunderstanding of the geologic characteristics of this belt by foreign researchers. This note summarizes the discussion between the authors during the process of deciding which is the best expression.

Outline of the shear zones in the Kuzuryu area, Hida Gaien belt, Fukui Prefecture, central Japan

飛騨外縁帯の九頭竜地域を構成する地質単元の境界は, 大部分剪断帯であることが構造地質学的調査によって判明した. これらの剪断帯のうち, 少なくとも4条は, 右横ずれ成分をもつ脆性—延性剪断帯であり, 飛騨外縁帯南縁部を画する脆性剪断帯は, 左横ずれ成分をもつ. 右横ずれ剪断帯は, 前期ジュラ紀の花崗岩礫を有する本戸層に変形を与えるが, 前期白亜紀の手取層群に変形を与えない. 一方, 左横ずれ剪断帯は前期白亜紀の手取層群を切る. したがって, 右横ずれ剪断帯は前期ジュラ紀～前期白亜紀に活動し, 左横ずれ剪断帯は白亜紀に活動したと解釈した.

Palaeozoic and Mesozoic tectonics of the Hida Gaien Belt, central Japan: Overview

飛騨外縁帯は日本列島の先新第三紀地体区分における最も古い地帯の1つである. それはオルドビス紀の苦鉄質—超苦鉄質岩類, オルドビス紀～ペルム紀の砕屑岩・火砕岩・炭酸塩岩類, 300-400 Maの青色片岩を伴う高圧型変成岩類, 蛇紋岩類, および中生代～新生代の被覆岩類からなる. 本稿では飛騨外縁帯の古生代～中生代テクトニクスに関する従来の研究, とくに最近の約20年間における研究の進展について概観し, 今後の課題について議論する. ここでは1951—2004年 (主に1980年以降) に出版された約100編の文献が取り上げられ, 紹介されている.

Stratigraphy of the Permian Shiroumadake Formation and its structural relationship with serpentinite in the Mt. Shiroumadake area, Hida Gaien belt, central Japan

飛騨外縁帯北東部の白馬岳地域にはペルム系白馬岳層が分布する. 白馬岳層は従来から言われていたようなメランジュやオリストストロームからなる付加体ではなく, 火山弧周辺の浅海で堆積した珪長質火砕岩類を主とする整然層である. 白馬岳層下部層形成時では珪長質火砕岩の堆積を主とするが, 下部層の上部形成時には玄武岩の水中噴火が生じ, バイモーダルな火山活動がみられる. 中部層形成時では, 火山活動が沈静化し頁岩や砂岩が堆積した. 上部層形成時では再びバイモーダルな火山活動が始まり, かつスランピング又は斜面崩壊によって石灰岩角礫や岩塊が珪長質凝灰角礫岩とともに堆積した.白馬岳層は角閃岩岩塊を含む蛇紋岩に衝上断層で覆われ, 蛇紋岩の構造的下位に位置する. その後NW-SE方向とNE-SW方向の高角度断層の形成に伴って, 古生界岩塊を含む蛇紋岩メランジュが形成された.

Deformation sequences of the Omi schists (Hida Gaien Belt) on the basis of deformation facies analysis, central Japan

変形相解析に基いて, 蛇紋岩メランジュをなす飛騨外縁帯・青海結晶片岩の変形系列が明らかにされた. 青海結晶片岩では変形小構造の空間分布によって4つの変形分帯がなされ, 変形小構造のうち, 高平均延性度相と低平均延性度相は各帯共通に, 一部の高平均延性度相と中平均延性度相は各帯で特徴的に出現する. また, 時代とともに平均延性度が低下していく条件の下で変形が進行していった. また, 岩相と変形小構造の形成関係を考慮に入れた変形相解析とファブリック解析は, 変形分帯が岩相規制によるものではなく, 変形史を反映したものであることを示している. これらの解析から, 青海結晶片岩は, 層平行剪断で形成された高平均延性度相からなる前期変形時相, 各変形帯特有な発達を示す高～中平均延性度相からなる中期変形時相, 低平均延性度相からなる後期変形時相に区分され, これら3変形時相をへて上昇したと考えられる.

Geological development of the Hida Gaien belt: Constraints from K-Ar ages of high P/T metamorphic rocks and U-Th-Pb EMP ages of granitic rocks affecting contact metamorphism of serpentinite

飛騨外縁帯の青海, 白馬—八方, 蒲田, 伊勢地域から21試料の高圧変成岩類の白雲母のK-Ar年代を測定した. 19試料の年代幅は283-338Maで, 飛騨外縁帯全体が西南日本蓮華帯の約300Ma高圧変成岩類からなる沈み込み変成帯の一部であることが確実になった. 一方, 周防帯の約200Ma高圧変成岩類に相当するものは, 認められなかった.蛇紋岩に接触変成作用を与えている花崗岩類のジルコン, モナザイト, トール石のU-Th-Pb EMP化学年代測定は, 蛇紋岩の上昇が白馬-八方地域では古第三紀, 蒲田地域でも白亜紀 (約100Ma) 以降であったことを示す. ペルム紀付加体のオリストリスとして産したりジュラ紀の来馬層群に覆われる蛇紋岩もあるので, 蛇紋岩とそれに取り込まれた高圧変成岩類の上昇および飛騨外縁帯の変形は, ペルム紀から少なくとも古第三紀以降まで続いている.

Silurian and Devonian radiolarian biostratigraphy of the Hida Gaien belt, central Japan

飛騨外縁帯の福地—一重ヶ根地域と九頭竜湖—伊勢川上流地域に露出する凝灰質砕屑岩相のシルル系・デボン系において放散虫生層序の検討を行った. 7つの主要なセクションで認められた放散虫化石群集に基づき, 下部シルル系ランドベリー統から下部デボン系エムス階に対比される計8つの群集帯を設定し, 飛騨外縁帯のシルル系・デボン系凝灰質砕屑岩層の時代を詳細に議論した. 従来, 飛騨外縁帯と黒瀬川帯・南部北上帯のシルル系・デボン系は, 凝灰質砕屑岩層の堆積年代やシルル系石灰岩層の有無等, 相違点が強調されてきた. しかし, 放散虫化石帯に基づく対比から, 後期シルル紀ラドロウ世から前期デボン紀エムス期の凝灰質砕屑岩層は, その発達状況において高い類似性があることが明らかになった. この類似性は, 3地帯のシルル系・デボン系が形成時において深く関連していたことを示す.

CHIME zircon ages of granodiorite clasts from the Motodo Formation, Hida-Gaien Belt, central Japan

CHIME (chemical Th-U-total Pb isochron method) dating of granodiorite clasts from the Motodo Formation of the Hida-Gaien Belt was carried out by precise microprobe analyses of zircon grains. The CHIME ages are 201±20 Ma and 202±30 Ma, indicating that the granodiorite intrusion in the provenance areas of the Motodo Formation occurred in the Early Jurassic time. The depositional age of the Motodo Formation was constrained by previous authors between the Late Permian and Early Cretaceous, but our data further restrict it between the Early Jurassic and Early Cretaceous. On the basis of age constraints and lithological similarities, the Motodo Formation correlates with the Kyongsang Supergroup in South Korea and the Kanmon Group in Southwest Japan. Early Jurassic granitoids are distributed in the Hida Belt in Japan and in the Korean Peninsula, which are considered as likely provenance areas for the sediments of the Motodo Formation.

Middle Permian brachiopod faunas of Japan and South Primorye, Far East Russia: their palaeobiogeographic and tectonic implications

Similarity of the generic compositions of the Middle Permian brachiopod faunas of Japan and South Primorye indicates a close tectonic relationship between the Voznesenka Belt, South Primorye and the Hida Gaien Belt, southwest Japan and also between the Sergeevka Belt, South Primorye and the South Kitakami Belt, northeast Japan. The original continuation of these belts is now invisible owing to the Cretaceous thrust movement and left-lateral strike-slip faulting in the Japan—South Primorye region and the Early Neogene opening of the Japan Sea. The total sinistral displacement of the Central Sikhote—Alin Fault, Partizan Fault, Tanakura—Median Tectonic Line, Hatakawa Tectonic Line, Kurosegawa Tectonic Zone and associated minor faults may be about 1,500–2,000 km.

Rhynchopora and Blasispirifer (Brachiopoda) from the Middle Permian of the Hida Gaien Belt, central Japan, and their paleobiogeographical significance.

Two Permian brachiopod genera, Rhynchopora King and Blasispirifer Kulikov, are reported for the first time from the Middle Permian, lower part of the Moribu Formation in the Hida Gaien Belt, central Japan. The Moribu species are closely compared with similar forms from the Middle Permian Barabash Formation (lower Chandalaz Series) in the Barabash area of South Primorye, Russian Far East. The discovery of these two genera, which exhibit close relationships with Middle Permian brachiopod faunas of South Primorye and the broad Boreal Realm, implies that tha Hida Gaien Belt was paleobiogeographically and paleogeographically close to the western part (Voznesenka Belt) of South Primorye, both situated in a middle latitudinal setting in the Northern Hemisphere on the southeastern side of the Bureya Block and lay proximal to and slightly northeast of the Sino-Korea Block during the Permian.

Devonian radiolarians from the Upper Ise River area of the western part of the Hida Gaien Belt, Izumi Village, Fukui Prefecture, central Japan

Devonian radiolarians from the Upper Ise River area of the western part of the Hida Gaien Belt, Izumi Village, Fukui Prefecture, central Japan

Reply to comment. Occurrence and significance of the Late Silurian and Early to Middle Devonian radiolarians from the Kuzuryu Lake district of the Hida Gaien Belt, Fukui Prefecture, central Japan. J.C. Aitchison. Journal of the Geological Society of Japan, vol. 104, No. 12, p.845-858.

Reply to comment. Occurrence and significance of the Late Silurian and Early to Middle Devonian radiolarians from the Kuzuryu Lake district of the Hida Gaien Belt, Fukui Prefecture, central Japan. J.C. Aitchison. Journal of the Geological Society of Japan, vol. 104, No. 12, p.845-858.

Comment on Kurihara, T. and Sashida, K. 1998 "Occurrence and significance of the Late Silurian and Early to Middle Devonian radiolarians from the Kuzuryu Lake district of the Hida Gaien Belt, Fukui Prefecture, central Japan"(Journal of the Geological Society of Japan, vol. 104, no. 12, p. 845-858)

Comment on Kurihara, T. and Sashida, K. 1998 "Occurrence and significance of the Late Silurian and Early to Middle Devonian radiolarians from the Kuzuryu Lake district of the Hida Gaien Belt, Fukui Prefecture, central Japan"(Journal of the Geological Society of Japan, vol. 104, no. 12, p. 845-858)

Occurrence and significance of the Late Silurian and Early to Middle Devonian radiolarians from the Kuzuryu Lake district of the Hida Gaien Belt, Fukui Prefecture, central Japan

Occurrence and significance of the Late Silurian and Early to Middle Devonian radiolarians from the Kuzuryu Lake district of the Hida Gaien Belt, Fukui Prefecture, central Japan

飛騨外縁帯森部地域よりデボン紀床板サンゴ・ウミユリ類の発見

飛騨外縁帯森部地域よりデボン紀床板サンゴ・ウミユリ類の発見

Late Carboniferous fusulinid and brachiopod from the upper part of the Arakigawa Formation, Hida Gaien Belt, Central Japan

Late Carboniferous fusulinid and brachiopod from the upper part of the Arakigawa Formation, Hida Gaien Belt, Central Japan