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lapilli

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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.
... in volcaniclastic rocks despite vertical compressional strain (i.e., flattening), such as lapilli and crystal fragments that are variably oriented with the S 1 fabric ( Figs. 9 – 11 ). Bradshaw et al. ( 2008 ) note that stratigraphy in the vicinity of the Wolverine deposit is deformed and significantly flattened...
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Journal Article
Published: 01 April 2022
Russ. Geol. Geophys. (2022) 63 (4): 458–482.
...-detrital complex composed of lapilli tuffs, xenotuffs, and tuffites of ultramafic rocks ( Proskurnin et al., 2012 ) and, probably, kimberlites ( Proskurnin and Shkarubo, 2014 ) or lamproites ( Letnikova et al., 2013 ), which formed with the active role of phreatomagmatic processes. At Cape Tsvetkov, small...
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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.
... ). Fig. 3. Schematic cross-section through the Chisel sequence (modified after Bailes et al. 2013 ). [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...
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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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Journal Article
Published: 01 August 2017
Russ. Geol. Geophys. (2017) 58 (8): 869–886.
...N.L. Dobretsov; V.A. Simonov; A.V. Kotlyarov; S.I. Stupakov Abstract Vitreous basalts and plagioclase lapilli from Tolbachik Volcano studied by high-temperature gas chromatography reveal features of a fluid regime uncommon to suprasubduction melts. Prominent depletion in volatiles confirms...
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Journal Article
Published: 09 March 2016
Journal of the Geological Society (2016) 173 (4): 701–710.
... deposits resulted from phreatomagmatic eruptive phases of the Blue Lake East and the Valley Lake maar craters. The facies descriptions of the two massive, poorly sorted lapilli tuff and tuff breccia deposits are given. Low-grade carbonized wood fragments in the deposits mark low emplacement temperatures...
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