caa a22 4500 477062466 CHVBK 20180405111404.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/s004450050131 doi (NATIONALLICENCE)springer-10.1007/s004450050131 Kano Kazuhiko Geology Department, Geological Survey of Japan, 1-3, Higashi 1-chome, Tsukuba, Ibaraki, 305, Japan, JP aut A Miocene coarse volcaniclastic mass-flow deposit in the Shimane Peninsula, SW Japan: product of a deep submarine eruption? [Elektronische Daten] [Kazuhiko Kano]  A subaqueous volcaniclastic mass-flow deposit in the Miocene Josoji Formation, Shimane Peninsula, is 15-16 m thick, and comprises mainly blocks and lapilli of rhyolite and andesite pumices and non- to poorly vesiculated rhyolite. It can be divided into four layers in ascending order. Layer 1 is an inversely to normally graded and poorly sorted lithic breccia 0.3-6 m thick. Layer 2 is an inversely to normally graded tuff breccia to lapilli tuff 6-11 m thick. This layer bifurcates laterally into minor depositional units individually composed of a massive, lithic-rich lower part and a diffusely stratified, pumice-rich upper part with inverse to normal grading of both lithic and pumice clasts. Layer 3 is 2.5-3 m thick, and consists of interbedded fines-depleted pumice-rich and pumice-poor layers a few centimeters thick. Layer 4 is a well-stratified and well-sorted coarse ash bed 1.5-2 m thick. The volcaniclastic deposit shows internal features of high-density turbidites and contains no evidence for emplacement at a high temperature. The mass-flow deposit is extremely coarse-grained, dominated by traction structures, and is interpreted as the product of a deep submarine, explosive eruption of vesicular magma or explosive collapse of lava. Springer-Verlag Berlin Heidelberg, 1996 Key words Submarine eruption nationallicence Explosive lava collapse nationallicence Coarse pumice nationallicence Volcaniclastic mass flow nationallicence Traction nationallicence Suspension nationallicence https://doi.org/10.1007/s004450050131 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004450050131 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kano Kazuhiko Geology Department, Geological Survey of Japan, 1-3, Higashi 1-chome, Tsukuba, Ibaraki, 305, Japan, JP aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer