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lapilli

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Journal Article
Journal: GSA Bulletin
Published: 10 October 2023
GSA Bulletin (2023)
... vapor, brown ash, and coarse material were suddenly ejected, and the products struck a group of people, injuring some of them. The proximal deposit formed a continuous mantle of ash, lapilli, and decimeter-sized bombs, while the ballistic material travelled up to 200 m from the lava edge. The deposit...
Journal Article
Journal: Geosphere
Published: 04 November 2022
Geosphere (2022) 18 (6): 1926–1957.
.... Pyroclastic deposits occur in four main facies: (1) lapilli- and blockdominated beds, (2) thinly bedded lapilli tuff, (3) laminated and cross-laminated ash, and (4) massive lapilli ash/tuff. Lapilli- and block-dominated beds are found mostly within several hundred meters of the crater and transition outward...
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Journal Article
Journal: Economic Geology
Published: 01 August 2022
Economic Geology (2022) 117 (5): 1173–1201.
... Campbell thrust sheet that have been variably metamorphosed to greenschist facies ( Murphy et al., 2006 ). However, primary textures are preserved throughout the rock units in the Grass Lakes and Wolverine Lake groups (e.g., lapilli, laminations), and as such, we omit the prefix “meta” from all rock...
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Series: GSA Special Papers
Published: 03 May 2022
DOI: 10.1130/2021.2553(27)
EISBN: 9780813795539
... currents capable of traveling hundreds of kilometers, and even globally. As terrestrial analogs, smaller-scale density currents are widespread around explosive volcanoes and nuclear test sites, whereas terrestrial impact analogs are lacking. Steam condensation on particles causes accretionary lapilli...
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Journal Article
Published: 01 April 2022
Russ. Geol. Geophys. (2022) 63 (4): 458–482.
..., Khatystakh River, 11, Chekanovsky Ridge, Tas-Krest-Yuryage River). Late Ladinian continental sandstones are overlain by black and dark gray leptochlorite gritstones forming 2–3 cm thick plates (later, these rocks were identified by us as lapilli tuffs) ( Fig. 2 B ). The gravel lapilli are ideally...
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Journal Article
Journal: Geology
Published: 08 March 2022
Geology (2022) 50 (5): 636–640.
... impact, and most recently a drill core from the crater itself, yet the processes and chemical reactions occurring in the impact vapor plume are poorly constrained. Rounded carbonate particles, identified as accretionary lapilli, have been found thousands of kilometers from the impact crater and may...
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Journal Article
Journal: Geology
Published: 01 December 2021
Geology (2022) 50 (3): 311–315.
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Series: GSA Special Papers
Published: 02 August 2021
DOI: 10.1130/2021.2550(08)
EISBN: 9780813795508
... and upper sedimentary target lithologies. Aggregates of recrystallized calcite with silicate melt indicate the consolidation of a hot suevitic component with sediments at ≳750 °C. Accretionary lapilli formed in a turbulent, steam-condensing environment at ~100 °C by aggregation of solid, ash-sized particles...
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Journal Article
Journal: Geology
Published: 23 July 2021
Geology (2021) 49 (11): 1307–1311.
... and expansion. New textural observations of sub-Plinian and Plinian pumice lapilli reveal that some primary products of magma fragmentation survive by sintering together within seconds of magma break-up. Their size distributions reflect the energetics of fragmentation, consistent with products of rapid...
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Series: Geological Society, London, Memoirs
Published: 27 May 2021
DOI: 10.1144/M55-2018-44
EISBN: 9781786209863
... immense phreatocauldrons filled with structureless tuff breccias and lapilli tuffs with thicknesses of as much as 400 m. Stratified sequences of tuff breccias, lapilli tuffs and tuffs are up to 200 m thick. Thin tuff beds are sparsely distributed in the lava sequences. Lava successions are mainly 400–500...
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Series: Geological Society, London, Memoirs
Published: 27 May 2021
DOI: 10.1144/M55-2018-59
EISBN: 9781786209863
... on the left, and Gray, Hertha and Castor nunataks from front to back, respectively. The largest nunatak in the view (Hertha) rises to 225 m asl. ( c ) Broken slabs and homogenized lapilli tuff at Bruce Nunatak. The structure suggests destabilization and local fluidization of a weakly lithified stratified...
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Series: Geological Society, London, Memoirs
Published: 27 May 2021
DOI: 10.1144/M55-2018-61
EISBN: 9781786209863
... pillows intruding orange lapilli tuffs; the hammer is c. 40 cm long. ( c ) Diffusely stratified lapilli tuffs; the notebook is 17 cm long. Table 1. Summary of published isotopic ages for the Upper Scott Glacier Volcanic Field Sample Locality Dated lithologies Age* (Ma...
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Series: Geological Society, London, Memoirs
Published: 27 May 2021
DOI: 10.1144/M55-2019-2
EISBN: 9781786209863
... ). Five separate lava flows were sampled in stratigraphic succession through a c. 110 m exposed cliff section on Sheridan Bluff itself. The lowest and stratigraphically oldest lava (SB15-001) lies conformably on top of an orange lapilli tuff, which, in turn, overlies a glacially striated granitoid...
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Journal Article
Published: 01 December 2020
Rocky Mountain Geology (2020) 55 (2): 75–89.
... Ma for zircons extracted from a recently recognized dacite lapilli ash-fall tuff near the base of the synorogenic Iron Springs Formation. We propose the name “Three Peaks Tuff Member” for this unit, and identify a type stratigraphic section on the western flank of the “Three Peaks,” a topographic...
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Journal Article
Journal: Geology
Published: 23 September 2020
Geology (2021) 49 (2): 211–215.
... vertical surfaces, steep-sided dune forms, accretionary lapilli, mud lumps, and vesiculated tuffs; Lorenz, 1974 ; Fisher and Schmincke, 1984 ) are used to support interpretations of emplacement by cool (<100 °C), “wet” pyroclastic surges involving water droplets (e.g., Heiken, 1971 ; Dellino et al...
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Journal Article
Published: 06 August 2020
Canadian Journal of Earth Sciences (2021) 58 (3): 247–267.
... ). [Colour online.] Volcaniclastic facies in this study are named using the granulometric terms tuff, lapilli tuff, lapillistone, and tuff breccia of Fisher (1966) . Bedding thickness and type is described using terminology from McPhie et al. (1993) . The term “juvenile”, in this paper...
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Journal Article
Published: 21 April 2020
Geological Magazine (2020) 157 (12): 2021–2032.
... reworked tuffite containing pumice and lithic clasts that petrologically and geochemically resemble those found in KPT unit E tephra, and reworked accretionary lapilli similar to those in KPT unit F. Tuffite is found only downslope from a 375-m-high pass between the Dikeos and Sympetro mountains, which...
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Series: Geological Society, London, Special Publications
Published: 30 September 2019
DOI: 10.1144/SP477.3
EISBN: 9781786203861
... Abstract Tephra beds are considered to be potential failure planes for submarine landslides. Here, we report on an example of a coarse-ash/lapilli-tuff bed influencing translational slides. The studied mass-transport deposit (MTD) is intercalated in the Pleistocene forearc basin fill exposed...
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Journal Article
Journal: GSA Bulletin
Published: 15 April 2019
GSA Bulletin (2019) 131 (9-10): 1537–1554.
... wall-rock clasts (Episode 1) and dominantly scoria (Episode 2; VEI-3) across >65 km 2 southeast of the summit. Dense 12 cm blocks of Episode 1 fell 8–10 km from the summit vent, and 2–4 cm lithic lapilli reached the coastline, 17 km from the vent. The Episode 2 deposit is chemically zoned...
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Journal Article
Journal: Geology
Published: 08 January 2019
Geology (2019) 47 (2): 179–182.
... or accretions. To investigate both mechanisms, we analyzed ash-encased lapilli from the Surtseyan eruptions of Capelinhos (Azores, 1957–1958) and Hunga Tonga–Hunga Ha’apai (Tonga, 2014–2015) using X-ray computed microtomography and electron microscopy. We discovered pyroclasts that were not coated, sensu...
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