Depositional setting of the Upper Triassic siliceous micrite of the Mino-Tamba Belt

Sano, Hidehiko; Takano, Atsushi; Miyamoto, Kazuki; Onoue, Tetsuji

doi:10.5575/geosoc.2016.0061

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Modified after H. Sano et al. (2017). (b) Petit‐spot magma intrusion into the basalt‐limestone mélange and the pelagic chert.…”

Section: Discussionmentioning

confidence: 99%

“…The depositional age of micritic limestone remains unconstrained due to the replacement of radiolarians with recrystallized calcite. However, the mineral assemblage and texture of the micritic limestone resemble Upper Triassic siliceous micrites in Middle Jurassic to Early Cretaceous accretionary complexes of Southwest and Central Japan, which represent an appearance of calcareous nannoplankton in the pelagic region of Panthalassa Ocean during the Late Triassic (Onoue & Yoshida, 2010; H. Sano et al., 2010, 2017; Yoshida & Onoue, 2008). Because terrigenous materials are absent, the BLM may originate from the mixing of micritic limestone and basalt in a submarine landslide on the lower slope of a seamount above the CCD (Figure 12a) (e.g., Matsuda & Ogawa, 1993).…”

Section: Discussionmentioning

confidence: 99%

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Origin of Alkaline Basaltic Intrusive Rocks in an Exhumed Accretionary Complex: Implications for Past Petit‐Spot Volcanism in the Ocean

Motohashi

Sano

Ujiie

et al. 2023

Geochem Geophys Geosyst

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Oceanic basalt has diverse origins representing variations of intraplate volcanism, including hot plume activity (e.g., Clague & Sherrod., 2014;Coffin & Eldholm, 1994), anomalous melting in the mantle associated with asthenospheric return flow (e.g., White et al., 2006), and off-axis volcanism (Janney et al., 2000). Another origin of oceanic basalt is petit-spot volcanism associated with plate flexure of old oceanic plate, which has been found in the oceanic plate seaward of

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“…Modified after H. Sano et al. (2017). (b) Petit‐spot magma intrusion into the basalt‐limestone mélange and the pelagic chert.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Origin of Alkaline Basaltic Intrusive Rocks in an Exhumed Accretionary Complex: Implications for Past Petit‐Spot Volcanism in the Ocean

Motohashi

Sano

Ujiie

et al. 2023

Geochem Geophys Geosyst

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岐阜県西部，舟伏山岩体東部の美濃帯ペルム系～三畳系チャート優勢層の層序と年代

弘好

2018

Jour. Geol. Soc. Japan

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This study examines the lithostratigraphy and age of the chertdominated succession in the eastern section of the Funabuseyama rock mass within the Mino Belt. The chert-dominated succession (~ m thick) comprises (in ascending order) basaltic rocks, reddish chert, clastic dolomite, gray-to-black chert, black claystone, darkgray-to-black chert, and alternating layers of siliceous micrite and chert. Radiolarian biostratigraphy indicates that the reddish chert, gray-to-black chert, and dark-gray-to-black chert are correlated with the middle to upper Cisuralian, lower Guadalupian to upper Lopingian, and upper Lower to upper Middle Triassic, respectively. The age of the alternating siliceous micrite and chert falls within the beginning to middle Late Triassic. The entirety of the chert-dominant succession ranges in age from the middle Cisuralian to the middle Upper Triassic. The lithostratigraphy and complete lack of coarse terrigenous grains and rocks within the chert-dominant succession indicate a formation through pelagic, deep-marine sedimentation on the lower flank of an ocean-floor basaltic seamount in an open-ocean realm. The clastic dolomite is interpreted to represent sediments displaced from a shallow-marine setting into a deep-marine setting where the chert accumulated. Lithostratigraphy and biostratigraphy show that the middle Cisuralian to upper Lower Triassic section of the chert-dominant succession is correlated with the previously defined Hashikadani Formation and partially emends the western section of the Funabuseyama rock mass. By adding the middle Triassic chert and upper Triassic alternating siliceous micrite and chert to the middle Cisuralian to upper Lower Triassic chert-dominated succession, we propose that a revision to the Hashikadani Formation is required. Accordingly, the Hashikadani Formation should be interpreted as a sedimentary unit recording a long-lived deep-marine and pelagic sedimentation from the middle Cisuralian to middle Late Triassic upon a basaltic basement in an open-ocean realm.

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Upper Triassic limestone clasts of the polymictic limestone conglomerate in the Mino Belt, the northwestern Nanjo Mountains, Fukui Prefecture, central Japan

Nakagawa¹,

Sano

Agematsu

et al. 2019

Jour. Geol. Soc. Japan

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Depositional setting of the Upper Triassic siliceous micrite of the Mino-Tamba Belt

Abstract: We present the mode of occurrence, microfacies, and age of the Kugo Limestone, which occurs as discrete blocks in the Middle Jurassic to earliest Cretaceous Neo mélange in the Kanayama Unit, western Mino Mountains, central Japan

Cited by 4 publications

References 24 publications

Origin of Alkaline Basaltic Intrusive Rocks in an Exhumed Accretionary Complex: Implications for Past Petit‐Spot Volcanism in the Ocean

Origin of Alkaline Basaltic Intrusive Rocks in an Exhumed Accretionary Complex: Implications for Past Petit‐Spot Volcanism in the Ocean

岐阜県西部，舟伏山岩体東部の美濃帯ペルム系～三畳系チャート優勢層の層序と年代

Upper Triassic limestone clasts of the polymictic limestone conglomerate in the Mino Belt, the northwestern Nanjo Mountains, Fukui Prefecture, central Japan

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