Imbricate structure of the Permian Yoshii Group in the Otakeyama area, Okayama Prefecture, southwest Japan

Ito, Tsuyoshi; Matsuoka, Atsushi

doi:10.1007/s11707-014-0443-x

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…Niwa (, ) indicated the possibility that mafic volcanic rock in addition to the siliceous claystone constitutes a major or part of a décollement zone based on geological mapping of the Tamba–Mino–Ashio terrane. In Permian ACs, Ito and Matsuoka () recognized an imbricate structure in the Yoshii Group of the Akiyoshi terrane and highlighted the possibility that a specific horizon in Permian pelagic sequences acted as a décollement zone during Permian accretionary processes.…”

Section: Introductionmentioning

confidence: 99%

Lithology and radiolarian age of the Ryokami‐yama Chert Formation in eastern Mt. Ryokami: Possible décollement zone in Permian pelagic sequence in mid‐Mesozoic accretionary complexes of Southwest Japan

Ito

Matsuoka

2018

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Uppermost Permian–lowermost Triassic siliceous claystone is well‐known as being a possible décollement zone in accretionary processes of mid‐Mesozoic accretionary complexes in Southwest Japan; meanwhile, fewer studies have focused on other décollement zones in Permian pelagic sequences. The Ryokami‐yama Thrust in the Southern Chichibu terrane, eastern Mt. Ryokami, Kanto Mountains, has been considered an out‐of‐sequence thrust and might show a former décollement zone in the formation's Permian pelagic sequences. This study shows the Permian pelagic sequences (lithology and radiolarian age) of the Ryokami‐yama Chert Formation on the Ryokami‐yama Thrust. The basal part of the Ryokami‐yama Chert Formation consists of pale‐green basaltic tuff breccia and overlying red‐ocher thick‐bedded chert intercalating dolomites. The red‐ocher thick‐bedded chert yielded radiolarians of the Pseudoalbaillella lomentaria Range‐Zone of the Sakmarian (Cisuralian: lower Permian). Compilation of the Permian pelagic sequences of the mid‐Mesozoic accretionary complexes in previous studies indicates that the bases of the Permian chert of many geologic units are concentrated in the Pseudoalbaillella lomentaria Range‐Zone. The following hypothesis is suggested here: the basaltic rock underlying the Sakmarian chert acted as a décollement zone in the Permian pelagic sequences of some geologic units of the mid‐Mesozoic accretionary complexes.

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Section: Introductionmentioning

confidence: 99%

Lithology and radiolarian age of the Ryokami‐yama Chert Formation in eastern Mt. Ryokami: Possible décollement zone in Permian pelagic sequence in mid‐Mesozoic accretionary complexes of Southwest Japan

Ito

Matsuoka

2018

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“…This type has been reported in the Cisuralian–Guadalupian in Japan (e.g. Hori, ; Ishiga, ; Ishiga et al, ; Ishiga, Kito, & Imoto, , ; Ishiga & Suzuki, ; Ito & Matsuoka, ; Kametaka, ; Kurihara & Kametaka, ; Nakae, ; Sano, ; Ujiié & Oba, ; Yamamoto, ), United States (Blome & Reed, ), China (Sun, Xia, & Liu, ; Wang, Cheng, & Yang, ; Wang, Luo, Kuang, & Li, ; Wang, Luo, & Yang, ; Wang & Yang, ; Xia & Zhang, ; Xie, Yang, Liu, & Feng, ; Zhang, Henderson, Xia, Wang, & Shang, ), Russia (Rudenko & Panasenko, ), and Thailand (Burrett, Udchachon, Thassanapak, & Chitnarin, ; Sashida, Igo, Hisada, Adachi, et al, ; Sashida, Igo, Hisada, Nakornsri, & Ampornmaha, ; Sashida & Salyapongse, ). Albaillella sinuata co‐occurred with the Lopingian radiolarian assemblage in southwest Japan (Kuwahara, ; Kuwahara & Yao, ; Mitsumura & Kamata, ; Takemura & Yamakita, ); however, Takemura and Yamakita () considered it as a reworked fossil because of the rarity of this species within the assemblage.…”

Section: Paleontological Notesmentioning

confidence: 57%

Morphological characteristics of a dimorphic pair of Albaillella sinuata Ishiga and Watase: Dimorphism in the lineage of the Permian Albaillellaria (Radiolaria)

2018

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Some taxa of the order Albaillellaria (radiolaria) are dimorphic with normal and swollen types. This study observed and biometrically analyzed the normal and swollen types of Albaillella sinuata Ishiga and Watase from a red chert bed of the Waji section of Ie Island, Okinawa Prefecture, Japan. The distribution of the slimness of the shell body of A. sinuata is bimodal, indicating that the normal and swollen types are clearly dividable. The observational and biometric results indicate that the swollen‐type A. sinuata is characterized by a swollen apical portion and a shorter overall height compared to the normal‐type A. sinuata. Meanwhile, there is no clear difference in the width of the basal part of the shell between the normal and swollen types. Dimorphism composed of the normal and swollen types is recognized within several lineages of the Albaillellaria by a compilation of previous reports of the swollen‐type occurrences in the Permian. Therefore, the dimorphism is a common phenomenon that extends beyond the families within the Permian Albaillellaria.

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“…The age of this zone is reported as Roadian (Middle Permian) by different researchers (e.g. Ishiga, , ; Ito & Matsuoka, ; Jasin & Harun, ; Kuwahara et al, ; Y. J. Wang et al, , , ; Y. J. Wang & Yang, ; Xia, Ning, Kakuwa, & Lil, ; A. Yao & Kuwahara, ; Figure ). We applied this assignation to this study.…”

Section: Dating Of Permian Sequencesmentioning

confidence: 92%

“…The age of the P. lomentaria and the correlative P. lomentaria–P. sakmarensis Zone is reported in different articles as follows: middle Wolfcampian (=Asselian) by Ishiga and others (Ishiga, , ; Ishiga & Imoto, ; Jasin et al, ); middle–late Wolfcampian (Asselian–Artinskian) by Wang and others (Y. J. Wang et al, , ; Y. J. Wang & Yang, ); late Asselian–middle Sakmarian (Caridroit in De Wever et al, ; Jasin & Harun, ; Sashida & Salyapongse, ); early to middle Sakmarian (Ito & Matsuoka, ); and late Artinskian‐early Kungurian (H. Kozur & Mostler, ). Meanwhile, the age of the P. scalprata m. rhombothoracata Zone and its correlatives has been assigned to latest Wolfcampian (late Sakmarian to late Artinskian) in the body of work from from southeast Asia (e.g.…”

Section: Dating Of Permian Sequencesmentioning

confidence: 99%

Integrated Radiolaria, benthic foraminifera and conodont biochronology of the pelagic Permian blocks/tectonic slices and geochemistry of associated volcanic rocks from the Mersin Mélange, southern Turkey: Implications for the Permian evolution of the northern Neotethys

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Blocks and tectonic slices within the Mersin Mélange (southern Turkey), which are of Northern Neotethyan origin (Izmir–Ankara–Erzincan Ocean (IAE)), were studied in detail by using radiolarian, conodont, and foraminiferal assemblages on six different stratigraphic sections with well‐preserved Permian succesions. The basal part of the Permian sequence, composed of alternating chert and mudstone with basic volcanics, is assigned to the late Asselian (Early Permian) based on radiolarians. The next basaltic interval in the sequence is dated as Kungurian. The highly alkaline basic volcanics in the sequence are extremely enriched, similar to kimberlitic/lamprophyric magmas generated at continental intraplate settings. Trace element systematics suggest that these lavas were generated in a continental margin involving a metasomatized subcontinental lithospheric mantle source (SCLM). The middle part of the Permian sequences, dated by benthic foraminifera and conodont assemblages, includes detrital limestones with chert interlayers and neptunian dykes of middle Wordian to earliest Wuchiapingian age. Higher in the sequence, detrital limestones are overlain by alternating chert and mudstone with intermittent microbrecciated beds of early Wuchiapingian to middle Changhsingian (Late Permian) age based on the radiolarians. A large negative shift at the base of the Lopingian at the upper part of section is correlated to negative shifts at the Guadalupian/Lopingian boundary associated with the end‐Guadalupian mass extinction event. All these findings indicate that a continental rift system associated with a possible mantle plume existed during the late Early to Late Permian period. This event was responsible for the rupturing of the northern Gondwanan margin related to the opening of the IAE Ocean. When the deep basinal features of the Early Permian volcano‐sedimentary sequence are considered, the proto IAE oceanic crust formed possibly before the end of the Permian. This, in turn, suggests that the opening of the IAE Ocean dates back to as early as the Permian.

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Imbricate structure of the Permian Yoshii Group in the Otakeyama area, Okayama Prefecture, southwest Japan

Cited by 13 publications

References 19 publications

Lithology and radiolarian age of the Ryokami‐yama Chert Formation in eastern Mt. Ryokami: Possible décollement zone in Permian pelagic sequence in mid‐Mesozoic accretionary complexes of Southwest Japan

Lithology and radiolarian age of the Ryokami‐yama Chert Formation in eastern Mt. Ryokami: Possible décollement zone in Permian pelagic sequence in mid‐Mesozoic accretionary complexes of Southwest Japan

Morphological characteristics of a dimorphic pair of Albaillella sinuata Ishiga and Watase: Dimorphism in the lineage of the Permian Albaillellaria (Radiolaria)

Integrated Radiolaria, benthic foraminifera and conodont biochronology of the pelagic Permian blocks/tectonic slices and geochemistry of associated volcanic rocks from the Mersin Mélange, southern Turkey: Implications for the Permian evolution of the northern Neotethys

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