Middle Jurassic radiolarians from carbonate manganese nodules in the Otori Formation in the eastern part of the Kuzumaki-Kamaishi Subbelt, the North Kitakami Belt, Northeast Japan

紀毅, 鈴木; 聡, 山北; 聡, 高橋; 昌之, 永広

doi:10.5575/geosoc.113.274

Cited by 14 publications

(10 citation statements)

References 16 publications

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“…Geological setting of Northeast Japan. References for fossil localities of clastic rocks: 1, Tajika, Iwata, and Kurosawa (); 2, Ishiga and Ishiyama (); 3, M. Kawamura, Ozawa, Kameyama, and Iwata (); 4, A. Matsuoka (); 5, H. Ueda, Mori, and Sato (), 7: Nakae and Kamada (); 8, N. Suzuki, Yamakita, Takahashi, and Ehiro (); 9, Taketani and Minoura (), A. Matsuoka and Oji (); 10, N. Suzuki, Ehiro et al (); 11, Yoshihara, Suzuki, and Ehiro (). References for megalodontoid limestone localities: 3, Okimura (), Tamura (); 4, Sano, Sugisawa, and Shimaguchi (, ); 6: T. Kawamura and Ueno ()…”

Section: Geological Backgroundsmentioning

confidence: 99%

“…In the North Kitakami Belt, timing of tectonic accretion of sediments, as approximated by the age of trench‐fill clastic deposits, youngs from southwest to northeast (Ehiro, Yamakita, Takahashi, & Suzuki, ; N. Suzuki, Ehiro et al, ). Accretion ages shift from Early Jurassic in the Hirosaki area (H. Ueda et al, ) via dominantly Middle Jurassic in the Kuzumaki–Kamaishi Subbelt (N. Suzuki, Ehiro et al, ; N. Suzuki, Yamakita et al, ; Yoshihara et al, ) and the Late Jurassic Akka–Tanohata Subbelt (A. Matsuoka & Oji, ; Nakae & Kamada, ) of the western and eastern parts of the Kitakami Mountains, respectively, to the Early Cretaceous in the Cape Shiriya area at the northeastern margin (A. Matsuoka, ; this study). This generally eastward‐younging polarity is regarded as a result of accretionary growth of the continental margin toward the ocean.…”

Section: Geological Backgroundsmentioning

confidence: 99%

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Material recycling in a sediment‐starved trench recorded in the Early Cretaceous Shiriya accretionary complex, Northeast Japan

et al. 2018

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Identifying and examining geological processes that have occurred in sediment‐starved trenches of ancient non‐accretionary subduction zones exposed on land are still challenging, because such style of subduction is believed to leave scarce rock records. Our new geological mapping, petrography of coarse clastic rocks, radiolarian and zircon U–Pb dating of the Shiriya accretionary complex in Northeast Japan suggest that the younger parts (Sr1 unit) of the complex formed in a sediment‐starved trench. The key observation is that debris derived from the inner trench slope directly overlies pelagic chert in many sections where trench turbidites are lacking. A significant mass of turbidites occurring in other sections are also considered to represent distal facies of the debrites from the adjacent inner trench slope, rather than normal trench‐fill turbidites directly supplied from the continental landmass. These recycled materials from the inner trench slope comprised an imbricate frontal accretionary wedge, together with pelagic siliceous deposits of ocean floor origin. This accretionary wedge of debrite origin suggests that mass wasting on inner slopes of sediment‐starved trenches does not always result in tectonic erosion (removal of materials from the upper plate), but results in material recycling to reconstruct a new frontal accretionary wedge. The spatial dimensions of the recycling cell may be one of the critical differences between accretionary and non‐accretionary margins. Recycled continental materials transported by turbidites from remote landmasses construct frontal wedges in accretionary margins, whereas mass wasting on adjacent slopes and re‐accretion at the trench recycle continental materials in non‐accretionary margins. The transition from an accretionary to non‐accretionary (i.e. sediment‐starved) trench detected in the Shiriya Complex potentially records tectonic response of the inner trench slope to increased friction along the subduction interface.

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Section: Geological Backgroundsmentioning

confidence: 99%

Section: Geological Backgroundsmentioning

confidence: 99%

Material recycling in a sediment‐starved trench recorded in the Early Cretaceous Shiriya accretionary complex, Northeast Japan

et al. 2018

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“…The latter is divided into two sub‐belts (i.e., the Akka‐Tanohata and the Kuzumaki‐Kamaishi sub‐belts) whose limits are defined by the Iwaizumi Tectonic Line (the Seki‐Odaira Fault), extending northwest‐southeast (Takahashi et al, 2016). These two sub‐belts are dominated by trench‐fill deposits of middle Jurassic (Suzuki, Ehiro, et al, 2007; Suzuki, Yamakita, et al, 2007; Yoshihara et al, 2002) and late Jurassic (Matsuoka & Oji, 1990; Nakae & Kamada, 2003) ages, and characterized by a younger age eastward. Although the North Kitakami Belt is mainly represented by accretionary units formed during the Jurassic, the trench‐fill clastic deposits of Shiriya Cape are marked by the presence of early Cretaceous radiolarians (Matsuoka, 1987; Ueda et al, 2018).…”

Section: Geological Context and Mode Of Occurrencementioning

confidence: 99%

Sedimentology and biostratigraphy of the upper Triassic carbonates from the Shiriya cape, North Kitakami Belt, Japan

et al. 2022

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Relics of the Panthalassa Ocean occur today in accretionary complexes and terranes on the entire Circum‐Pacific region. Among them, remains of shallow‐water carbonate systems provide valuable information about the ecology and environmental conditions that prevailed in this immense ocean. In this regard, the Shiriya Cape of the North Kitakami Belt (Aomori Prefecture, Honshu Island, Japan) is an essential place to study. Characterized by the presence of numerous limestone deposits embedded in typical accretionary mélange, including pluri‐kilometric massive slabs and metric bedded deposits, the cape is indeed a key vestige of carbonate deposition in the Panthalassa. All the limestone outcrop form the Shiriya Cape were sampled and studied in detail for the first time. Despite a general poor preservation, macroscopic sedimentary features such as burrows and large megalodontids patches as well as four microfacies were identified and are presented in detail in this work. On the basis of foraminifers and conodonts biostratigraphy, the age of the limestone deposits is defined as Norian. Similarities with analogous and synchronous systems from Panthalassan and Tethyan realms are extensively discussed. The closest analog to the Shiriya limestone appears to be the Panthalassan Dalnegorsk limestone (Russian Far East), both regarding microfacies and depositional setting. Sedimentary successions similar to Lofer‐cycles, well known in Tethyan synchronous systems, were also discovered in the Shiriya Cape. Along with the large limestone slabs, countless limestone‐bearing conglomerates also crop out on the Shiriya Cape. Their study and comparison with similar deposits in Japan highlighted their importance in the understanding of the dismantling of mid‐oceanic carbonates. The observations and comparison with well‐known carbonate systems permitted to establish a hypothetical depositional model of the Shiriya limestone corresponding to a Norian isolated carbonate system developed on an immerged volcanic seamount.

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“…No age data for the trench-fill terrigenous rocks has been reported in the "C" zone excluding the Late Jurassic coral fossils from possible shallow marine deposits. The "D" and "E" zones range from the Middle Jurassic to the Late Jurassic in the Kado-Akka areas (Nakae and Kamada, 2003;Suzuki et al, 2007b;Ehiro et al, 2008).…”

Section: Younging Polaritymentioning

confidence: 99%

“…Symbols with numbers indicate the locations for which fossil and zircon ages from terrigenous clastic rocks were reported. 1: Kawamura et al (2013); Uchino (2017), 2: Ueda et al (2009), 3: Yoshihara et al (2002); Suzuki and Ogane (2004), 4: Suzuki et al (2007a), 5: Suzuki et al (2007b); Ehiro et al (2008), 6: Uchino (2018a), 7: Suzuki et al (2007a), 8: Matsuoka and Oji (1990), 9: Minoura and Tsushima (1984), 10: Nakae and Kamada (2003), 11: Matsuoka (1987), 12: Uchino (2018b), 13: Ueda et al (2018), 14: Uchino (2019), 15: this study. HEF: Hayachine Eastern Marginal Fault, ITL: Iwaizumi Tectonic Line.…”

Section: Introductionmentioning

confidence: 99%

Late Jurassic radiolarians from mudstone near the U–Pb-dated sandstone ofthe North Kitakami Belt in the northeastern Shimokita Peninsula, Tohoku, Japan

Uchino

Suzuki

2020

Bull. Geol. Surv. Japan

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In the northeastern Shimokita Peninsula, Aomori Prefecture, a Jurassic accretionary complex (AC) belonging to the North Kitakami Belt is distributed in three hilly areas of the Kuwabatayama, Katasakiyama and Omori. Although the AC in the Kuwabatayama area has been extensively studied and subdivided into the Late Jurassic Iwaya Unit and the Early Cretaceous Shitsukari Unit, those in the other areas are not fully understood except for a recent report of the detrital zircon U-Pb age from sandstone in the Omori area. We extracted radiolarian fossils such as Eucyrtidiellum cf. pyramis indicating the Late Jurassic (probably Kimmeridgian) from mudstone near the U-Pb-dated sandstone in the Omori area. Because this radiolarian age is close to the zircon U-Pb age, and the horizons of the mudstone and sandstone are close without any recognizable distinctive tectonic discontinuity between them, the clastic rocks in the Omori area may be stratigraphically continuous or contemporaneous sequences deposited around the Kimmeridgian. The ACs in the Katasakiyama and Omori areas are correlative to the Iwaya Unit in the Kuwabatayama area based on the lithology, geologic structure and clastic rock age. Therefore, the ACs in the northeastern Shimokita Peninsula can be divided into the Late Jurassic and the Early Cretaceous units; the former is the Iwaya Unit in the Kuwabatayama area and the unnamed ACs in the Omori and Katasakiyama areas, while the latter is the Shitsukari Unit in the Kuwabatayama area.

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Middle Jurassic radiolarians from carbonate manganese nodules in the Otori Formation in the eastern part of the Kuzumaki-Kamaishi Subbelt, the North Kitakami Belt, Northeast Japan

Cited by 14 publications

References 16 publications

Material recycling in a sediment‐starved trench recorded in the Early Cretaceous Shiriya accretionary complex, Northeast Japan

Material recycling in a sediment‐starved trench recorded in the Early Cretaceous Shiriya accretionary complex, Northeast Japan

Sedimentology and biostratigraphy of the upper Triassic carbonates from the Shiriya cape, North Kitakami Belt, Japan

Late Jurassic radiolarians from mudstone near the U–Pb-dated sandstone ofthe North Kitakami Belt in the northeastern Shimokita Peninsula, Tohoku, Japan

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