Impacts of explosive volcanism on distal alluvial sedimentation: Examples from the Pliocene–Holocene volcaniclastic successions of Japan

Source to sink: A review of three decades of progress in the understanding of volcaniclastic processes, deposits, and hazards

“…The enormous volumes of pyroclastic material generated by large-scale explosive silicic eruptions and their long-range dispersal in distal tephra fall-out and ignimbrites means that depocentres outside the intra-arc region can also be impacted, either directly by primary pyroclastics or by volcaniclastic material transported via fluvial systems that in modern settings demonstrably traverse intervening topography (Kataoka and Nakajo, 2002;Manville, 2002;Segschneider et al, 2002b;Manville and Wilson, 2004a;Kataoka, 2005;Manville et al, 2005;Kataoka et al, 2008Kataoka et al, ,2009Manville et al, 2009-this volume), with similar influences inferred for successions extending back into the Archaean (Mueller, 1991;Mueller and Corcoran, 1998). Primary pyroclastic units, including both airfall tephra and pyroclastic density current deposits can form regional chronostratigraphic markers (Drexler et al, 1980;Miyabuchi, 2009-this volume), aiding in palaeographic reconstructions of depositional environments (Sohn et al, 2009-this volume).…”

Geomorphic and sedimentary evidence of a gigantic outburst flood from Towada caldera after the 15 ka Towada–Hachinohe ignimbrite eruption, northeast Japan

“…However, few studies have examined the sedimentological, geomorphological, and hydrological implications of a sudden, voluminous input of volcanic debris to sedimentary basins and associated terrace-and fan-forming processes, except for a small number of recent sedimentological studies (Nakayama and Yoshikawa, 1997;Kataoka and Nakajo, 2002;Kataoka, 2005;Kataoka et al, 2009) and geomorphological studies (Naito, 1966;Yokoyama, 1999;Yoshida et al, 2005;Kataoka et al, 2008). In other words, most of the studies in this field have focused on the relationship between local tectonics, global eustatic sea-level change, and climate change during the Quaternary.…”

Sedimentary response to ignimbrite emplacement across a fluvial–shallow‐marine transition: Ordovician Mweelrea Formation, South Mayo Trough, Western Ireland

“…An additional explanation for the noticeable lack of ash derives from the observation of Kataoka et al . () that fine‐grained, non‐welded ignimbrite like Ignimbrite 1 in the Mweelrea Formation is commonly impermeable and consolidated. Thus, although the landscape was apparently covered by the ignimbrite, either it was relatively impermeable and resisted erosion, or eroded material was carried and diluted in fluvial systems or via wave action.…”

“…An extensive literature exists on the effects of ignimbrite emplacement on sedimentary environments in proximal realms (e.g. Pinatubo 1991: Pierson et al, 1992;Major et al, 1996;Newhall and Punongbayan, 1996 [papers therein]; Taupo ignimbrite: Riggs et al, 2001;Segschneider et al, 2002;Manville et al, 2005Manville et al, , 2009, in distal fluvial and lacustrine environments (Kataoka and Nakajo, 2002;Kataoka, 2005;Kataoka et al, 2009), in a proximal setting in which block-and-ash flows flowed into the sea (Soufrière Hills Volcano: Trofimovs et al, 2006) and through mathematical treatment by Legros and Druitt (2000) that has provided insight into conditions that will cause shoreline disruption. Less well documented, however, is the manner in which a single emplacement event, distal from its source, can disrupt a transgressing or regressing shoreline succession, and how this succession will respond and recover.…”