Page 209 - Volcanic Textures A Guide To The Interpretation of Textures In Volcanic Rocks

Mount Read Volcanics 15-17, 165-169, 10, 11, 12, 13, 44 pumice concentration zone (see also pyroclastic flow deposit) 102,
mudflow deposit see debris-flow deposit 37, 102
multiple-crust structure (see also pillow lava) 58, 60, 23, 16 pumice flow deposit see ignimbrite
multiple-rind structure (see also pillow lava) 59-60, 16 pyroclast
non-particulate flow 31, 104, 120, 26.3-4 block 27-28, 6.8
bomb 27-28, 6.8
nuee ardente see pyroclastic flow deposit crystal 22
obsidian 24, 25, 26, 63, 68-69, 33, 2.1, 3.2-3, 20.2-3, 44.3 juvenile fragment 27-28, 6
Oshinkoshin Dyke, Japan 18, 9.7, 17.7 lithic fragment 29
pahoehoe lava (see also basalt) 23, 59, 60, 69-70, 34, 35, 19.6-7 pumice 27, 6.5
channel 60 scoria 27, 6.6
shelly 47, 69 shard 28-29, 7.1-3
spongy 23, 69, 19.6 pyroclastic breccia 6, Table 3
tube 60, 61, 69,35, 19.6 pyroclastic deposit 1, 2, 3, 8, 22, 29, 94-96, 7, 3
tumuli 60, 70 explosive magmatic 28, 95, 3
grain size terms 6, Table 3
palagonite 23, 28, 2.5, 7.3, 16.1
particle transport see transport and deposition phreatic 96, 3
peperite (see also intrusive hyaloclastite) 15, 53, 57-58, 60, 61, 64- phreatomagmatic 28, 29, 96, 3
66, 166, 22, 26, 29, 30, 14, 18.3, 43.1 rheomorphic 30-31
welded 7, 24, 25, 26, 27, 28, 3
perlite 15, 23, 24, 25-26, 55, 69, 166,75 2.6, 5, 12.5, 24.1, 27.2,
42.1, 42.6-7 pyroclastic fall deposit 95, 120-121, 58, 6.8, 19.3, 38.8, 39
phenocryst (see also crystal) 21-22, 26, 27, 69, 166, 167, 168, 9, characteristics 120-121
Table 1, 1.1-2, 6.2, 6.4, 8.1, 20.1, 44.1 co-ignimbrite 29, 30, 102, 120-121, 40, 41
phreatic deposit see pyroclastic deposit co-surge 29, 30, 118, 120
mantle bedding 120, 58, 39.1
phreatic eruption 96, 118
phreatomagmatic deposit see pyroclastic deposit phreatoplinian 30, 39.5-6
phreatomagmatic eruption 27, 58, 96, 118 plinian 121, 39.2-4
proximal 28, 120, 121, 39.2, 39.4, 39.7-8
phreatoplinian eruption 96
pumice fall deposit 3, 39.2-4
pillowed sill (see also pillow lava) 60, 24 scoria fall deposit 3, 6.6, 39.7-8
pillow fragment breccia see hyaloclastite pillow lava 15, 23, 32, water-settled 30, 121, 168, 59, 18.7, 41
33, 56, 58-60, 61, 2, 23, 25, 34, 9.4, 14.5-6, 15, 16, 17
welded 120, 3
facies 59-60, 25 pyroclastic flow deposit (see also ignimbrite) 29, 30, 95, 98, 99-
multiple-crust structure 58, 60, 23, 16 105, 113, 118, 122, 3, 37, 38, 40, 59, Table 4, 21, 22,
multiple-rind structure 59-60, 16 23, 24, 25, 26, 27, 28
pipe in pyroclastic flow deposit 30, 103, 40, 22.5-6, 26.6-7 aspect ratio 104
block and ash flow deposit 69, 99-102, 106, 3, 38, 40, 21.1-2
pipe vesicle 23, 58-59, 69-70, 34, 16.1, 17.2
characteristics 100-105
Pitts Head Tuff Formation, UK 28.4-5
components 100, 102, 105,40, 21.6, 22.3-7
planar bedding (see also sedimentary structure) 117-118, 120,
121, 54, 29.2, 38.8, 39.2, 40.5-7 compositional zoning 102, 105, 41, 26.2
devitrification 103, 42, 23.3-4, 24.3-4, 25
platy jointing see joint
dimensions 105
plinian eruption (see also explosive eruption) 95, 99, 102 facies 102-104, 105, 37, 41, 42, 43, 21.5, 21.6
Ponza, Italy 56, 5.1, 11.1-3
geometry 104, 43, 22.1-2
porphyridc texture 3, 15, 21-22, 53, 61, 166, 2, 9, Table 1, 1.1- grade 103-104, 26.3-5
2, 6.2, 6.4, 20.1, 44.7
ground layer 102, 40
primary dip 55, 59, 4, 36.1 pipe 30, 103, 40, 22.5-6, 26.6-7
primary volcaniclastic deposit (see also autoclastic deposit, scoria and ash flow deposit 95, 99, 102, 40, 21.3-4
pyroclastic deposit) 1, 94, 96, 106 subaqueous emplacement 106-108, 44, 45, 27, 28
progressive aggradation (see also pyroclastic flow deposit) 99-100, transport and deposition 99-100, 39
113, 117, 121, 39, 22.7, 37.1-2
vapour-phase crystallisation 31, 103, 42, 22.2, 23, 26.7
proximal coarse lithic breccia (see also pyroclastic flow deposit) 105 welding 102-104,42, 24, 25, 26.1, 26.3-5, 27, 28.2
pseudobreccia see apparent texture pyroclastic surge deposit 29, 30, 95, 117, 118-119, 122, 3, 56,
pseudofiamme (see also alteration) 15, 30, 167-169, 42.4, 43.1, 57,7.8,38.5-7
44.5
ash cloud surge deposit 118-119, 40
pseudo-pillow 33, 56, 18 , 9.6, 17.7 base surge deposit 96, 118-119, 38.5-7
pumice 15, 23, 27, 95, 96, 121, 9, 6.1-5, 18.5-6, 20.1, 20.4, dimensions 119
22.7, 33.1-5, 39.3-i
alteration 168-169, 23.5, 45, 46 ground surge deposit 102, 118-119,40
pyroclast-rich deposit (see also resedimented syn-eruptive
flotation 121, 40.3-4 volcaniclastic deposit) 28, 30, 56, 94-97, 168-169, Table
tube pumice 27, 168-169, 6.1-3, 23.1, 30.3, 33.1-3, 3
33.5-6, 46.1-4, 46.6-7
subaqueous 29.4, 30, 31, 32, 33, 34.5, 45, 46
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