Tephrochronological study of the Hokuriku Group—The age of the Hokuriku Group by tephra stratigraphy and correlation to the wide-spread tephra layers—

Tamura, Itoko; Yamazaki, Haruo

doi:10.5575/geosoc.110.417

Cited by 26 publications

(5 citation statements)

References 32 publications

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“…Most of the caldera-forming eruptions took place during the early Late Miocene to Pliocene volcanic phase (Acocella et al, 2008). Ten widespread tephra layers are identified in central Japan within the Plio-Pleistocene Hokuriki Group (Tamura & Yamazaki, 2004). This data set is complemented by geochemical characterization of 17 Late Pliocene tephras from caldera-forming eruptions of the (Paleo-) Honshu arc (Kimura et al, 2015, Satoguchi & Nagahashi, 2012.…”

Section: Neogene Volcanismmentioning

confidence: 99%

Tephrostratigraphy and Provenance From IODP Expedition 352, Izu‐Bonin Arc: Tracing Tephra Sources and Volumes From the Oligocene to Recent

Kutterolf

Schindlbeck

Robertson

et al. 2018

Geochem Geophys Geosyst

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Provenance studies of widely distributed tephras, integrated within a well‐defined temporal framework, are important to deduce systematic changes in the source, scale, distribution, and changes in regional explosive volcanism. Here, we establish a robust tephrochronostratigraphy for a total of 157 marine tephra layers collected during IODP Expedition 352. We infer at least three major phases of highly explosive volcanism during Oligocene to Pleistocene time. Provenance analysis based on glass composition assigns 56 of the tephras to a Japan source, including correlations with 12 major and widespread tephra layers resulting from individual eruptions in Kyushu, Central Japan, and North Japan between 115 ka and 3.5 Ma. The remaining 101 tephras are assigned to four source regions along the Izu‐Bonin arc. One, exclusively assigned to the Oligocene age, is proximal to the Bonin Ridge islands; two reflect eruptions within the volcanic front and back‐arc of the central Izu‐Bonin arc, and a fourth region corresponds to the Northern Izu‐Bonin arc source. First‐order volume estimates imply eruptive magnitudes ranging from 6.3 to 7.6 for Japan‐related eruptions and between 5.5 and 6.5 for IBM eruptions. Our results suggest tephras between 30 and 22 Ma reflect a subtly different Izu‐Bonin chemical signature compared to the recent arc. After a ∼9 Ma gap in eruption, tephra supply from the Izu‐Bonin arc predominated from 15 to 5 Ma, and finally a subequal mixture of tephra sources from the (palaeo)Honshu and Izu‐Bonin arcs occured within the last ∼5 Ma.

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Section: Neogene Volcanismmentioning

confidence: 99%

Tephrostratigraphy and Provenance From IODP Expedition 352, Izu‐Bonin Arc: Tracing Tephra Sources and Volumes From the Oligocene to Recent

Kutterolf

Schindlbeck

Robertson

et al. 2018

Geochem Geophys Geosyst

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“…1988), but it does not correspond to the ages of widespread tephras in the area. At least 15 tephra beds are described from this area (Ohkubo 1999; Tamura & Yamazaki 2004).…”

Section: Kanazawa‐toyama Areamentioning

confidence: 99%

“…The Negikami (Ise), Kamihijikata I (Kakegawa), O3 (Kanazawa), SK110 (Nagaoka), Kd25 (Boso), Ob4a (Choshi), and Km3 (Oga Peninsula; hereinafter referred to as the Oga) Tephra Beds are described as the Omine‐SK110 Tephra, which is from the north of the Chubu Mountains where the Omine PFD is distributed (Nagahashi et al . 2000, 2002; Fujioka & Kameo 2004; Tamura & Yamazaki 2004; Satoguchi 2007). This tephra is in the reversed polarity zone above the Olduvai Subchronozone (C1r2r: Niitsuma 1976).…”

Section: Tephra Descriptionmentioning

confidence: 99%

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Tephrostratigraphy of the Pliocene to Middle Pleistocene Series in Honshu and Kyushu Islands, Japan

Satoguchi

Nagahashi

2012

Island Arc

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The Pliocene to Pleistocene Series in each sedimentary basin or area of Japan has been investigated and described; however, their stratigraphic correlation is difficult because of complex geological structures. Regional stratigraphy has therefore been established using many intercalated tephra beds, i.e. by correlating tephra beds between distant areas. A standardized stratigraphic model of the Pliocene to Middle Pleistocene Series in Japan is put forward in this paper on the basis of tephrostratigraphy, magnetostratigraphy, and biostratigraphy. This stratigraphic model is important for studies of environmental changes and explosive volcanism in this period around the Japanese island‐arc.

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“…% anhydrous, low CaO contents of 0.52-0.58 wt.%), and remanent magnetization. Along the main feeding axis of the fan apron, the Znp marine tephra comprises very thick, pumice-rich beds referred to as Znp-Ywg in the Niigata region, Mokp in the Higashiyama Hills, Hjp in the Yoneyama area, and PM and Tm in the Himi region (Kurokawa et al 1987(Kurokawa et al , 1989(Kurokawa et al , 2002Watanabe 1990;Kurokawa and Tomita 1998;Tamura and Yamazaki 2004;Fig. 1).…”

Section: Znp Marine Tephramentioning

confidence: 96%

Characteristics of submarine pumice-rich density current deposits sourced from turbulent mixing of subaerial pyroclastic flows at the shoreline: field and experimental assessment

2011

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This study investigates the types of subaqueous deposits that occur when hot pyroclastic flows turbulently mix with water at the shoreline through field studies of the Znp marine tephra in Japan and flume experiments where hot tephra sample interacted with water. The Znp is a very thick, pumice-rich density current deposit that was sourced from subaerial pyroclastic flows entering the Japan Sea in the Pliocene. Notable characteristics are well-developed grain size and density grading (lithic-rich base, pumice-rich middle, and ash-rich top), preponderance of sedimentary lithic clasts picked up from the seafloor during transport, fine ash depletion in coarse facies, and presence of curviplanar pumice clasts. Flume experiments provide a framework for interpreting the origin and proximity to source of the Znp tephra. On contact of hot tephra sample with water, steam explosions produced a gas-supported pyroclastic density current that advanced over the water while a water-supported density current was produced on the tank floor from the base of a turbulent mixing zone. Experimental deposits comprise proximal lithic breccia, medial pumice breccia, and distal fine ash. Experiments undertaken with cold, water-saturated slurries of tephra sample and water did not produce proximal lithic breccias but a medial basal lithic breccia beneath an upper pumice breccia. Results suggest the characteristics and variations in Znp facies were strongly controlled by turbulent mixing and quenching, proximity to the shoreline, and depositional setting within the basin. Presence of abundant curviplanar pumice clasts in submarine breccias reflects brittle fracture and dismembering that can occur during fragmentation at the vent or during quenching. Subsequent transport in water-supported pumiceous density currents preserves the fragmental textures. Careful study is needed to distinguish the products of subaerial versus subaqueous eruptions.

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Tephrochronological study of the Hokuriku Group—The age of the Hokuriku Group by tephra stratigraphy and correlation to the wide-spread tephra layers—

Cited by 26 publications

References 32 publications

Tephrostratigraphy and Provenance From IODP Expedition 352, Izu‐Bonin Arc: Tracing Tephra Sources and Volumes From the Oligocene to Recent

Tephrostratigraphy and Provenance From IODP Expedition 352, Izu‐Bonin Arc: Tracing Tephra Sources and Volumes From the Oligocene to Recent

Tephrostratigraphy of the Pliocene to Middle Pleistocene Series in Honshu and Kyushu Islands, Japan

Characteristics of submarine pumice-rich density current deposits sourced from turbulent mixing of subaerial pyroclastic flows at the shoreline: field and experimental assessment

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