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DOI | 10.1130/B31448.1 |
Submarine deposits from pumiceous pyroclastic density currents traveling over water: An outstanding example from offshore Montserrat (IODP 340) | |
Jutzeler, M.1,2,3,4; Manga, M.5; White, J. D. L.; Talling, P. J.1; Proussevitch, A. A.6; Watt, S. F. L.7; Cassidy, M.8; Taylor, R. N.9; Le Friant, A.10,11; Ishizuka, O. | |
2017-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | England; New Zealand; Australia; USA; Germany; France; Japan |
英文摘要 | Pyroclastic density currents have been observed to both enter the sea, and to travel over water for tens of kilometers. Here, we identified a 1.2-m-thick, stratified pumice lapilli-ash cored at Site U1396 offshore Montserrat ( Integrated Ocean Drilling Program [IODP] Expedition 340) as being the first deposit to provide evidence that it was formed by submarine deposition from pumice-rich pyroclastic density currents that traveled above the water surface. The age of the submarine deposit is ca. 4 Ma, and its magma source is similar to those for much younger Soufriere Hills deposits, indicating that the island experienced large-magnitude, subaerial caldera-forming explosive eruptions much earlier than recorded in land deposits. The deposit's combined sedimentological characteristics are incompatible with deposition from a submarine eruption, pyroclastic fall over water, or a submarine seafloor-hugging turbidity current derived from a subaerial pyro-clastic density current that entered -water at the shoreline. The stratified pumice lapilli-ash unit can be subdivided into at least three depositional units, with the lowermost one being clast supported. The unit contains grains in five separate size modes and has a > 12 phi range. Particles are chiefly subrounded pumice clasts, lithic clasts, crystal fragments, and glass shards. Pumice clasts are very poorly segregated from other particle types, and lithic clasts occur throughout the deposit; fine particles are weakly density graded. We interpret the unit to record multiple closely spaced (< 2 d) hot pyroclastic density currents that flowed over the ocean, releasing pyroclasts onto the water surface, and settling of the various pyroclasts into the water column. Our settling and hot and cold flotation experiments show that waterlogging of pumice clasts at the water surface would have been immediate. The overall poor hydraulic sorting of the deposit resulted from mixing of particles from multiple pulses of vertical settling in the water column, attesting to complex sedimentation. Slow-settling particles were deposited on the seafloor together with faster-descending particles that were delivered at the water surface by subsequent pyroclastic flows. The final sediment pulses were eventually deflected upon their arrival on the seafloor and were deposited in laterally continuous facies. This study emphasizes the interaction between products of explosive volcanism and the ocean and discusses sedimentological complexities and hydrodynamics associated with particle delivery to water. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396813200009 |
WOS关键词 | SOUFRIERE HILLS VOLCANO ; CALDERA-FORMING ERUPTION ; IZU-BONIN ARC ; NEW-ZEALAND ; VOLCANICLASTIC RESEDIMENTATION ; EXPLOSIVE ERUPTIONS ; FACIES ARCHITECTURE ; TEPHRA DISPERSAL ; SILICIC CALDERA ; TAUPO ERUPTION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24595 |
专题 | 地球科学 |
作者单位 | 1.Nat Oceanog Ctr, Southampton SO14 3ZH, Hants, England; 2.Univ Otago, Dept Geol, Dunedin 9054, New Zealand; 3.Univ Tasmania, Sch Phys Sci, Private Bag 79, Hobart, Tas 7001, Australia; 4.Univ Tasmania, Ctr Excellence Ore Deposits, Hobart, Tas 7001, Australia; 5.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 6.Univ New Hampshire, Climate Change Res Ctr, Durham, NH 03824 USA; 7.Univ Birmingham, School Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England; 8.Johannes Gutenberg Univ Mainz, Inst Geosci, D-55128 Mainz, Germany; 9.Univ Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England; 10.Univ Paris Diderot, Inst Phys Globe Paris, F-75238 Paris, France; 11.Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Ibaraki 3058567, Japan |
推荐引用方式 GB/T 7714 | Jutzeler, M.,Manga, M.,White, J. D. L.,et al. Submarine deposits from pumiceous pyroclastic density currents traveling over water: An outstanding example from offshore Montserrat (IODP 340)[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Jutzeler, M..,Manga, M..,White, J. D. L..,Talling, P. J..,Proussevitch, A. A..,...&Ishizuka, O..(2017).Submarine deposits from pumiceous pyroclastic density currents traveling over water: An outstanding example from offshore Montserrat (IODP 340).GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Jutzeler, M.,et al."Submarine deposits from pumiceous pyroclastic density currents traveling over water: An outstanding example from offshore Montserrat (IODP 340)".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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