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all geography including DSDP/ODP Sites and Legs
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Africa
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Blue Nile (1)
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East Africa
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Afar Depression (2)
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East African Rift (3)
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North Africa
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Atlas Mountains
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Morocco
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Moroccan Atlas Mountains
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Middle Atlas (1)
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Southern Africa
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Barberton greenstone belt (1)
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Kaapvaal Craton (4)
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South Africa
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Bushveld Complex (3)
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Northern Cape Province South Africa (1)
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West Africa
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Cameroon
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Ghana (1)
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Arctic region
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Atlantic Ocean
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Atlantic Ocean Islands
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Faeroe Islands (3)
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Atlantic region (1)
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Australasia
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New Zealand
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Central America
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Commonwealth of Independent States
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Chelyabinsk Russian Federation (1)
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Karelia Russian Federation
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Kemerovo Russian Federation (1)
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Kuznetsk Basin (1)
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Murmansk Russian Federation
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Okhotsk region (1)
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Okhotsk-Chukchi volcanic belt (2)
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Transbaikalia (1)
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Tajikistan (1)
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Urals
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Europe
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Central Europe
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Italy
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Western Europe
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Iceland
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Scandinavia
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Sweden
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Western Gneiss region (1)
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United Kingdom
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Great Britain
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England
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London Basin (2)
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Northumberland England (1)
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Scotland
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Argyllshire Scotland
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Hebrides
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Isle of Skye (2)
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Mull Island (4)
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Outer Hebrides (1)
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Highland region Scotland
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Inverness-shire Scotland
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Isle of Skye (2)
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Rhum (2)
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Shetland Islands (1)
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Franklin Mountains (1)
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Hartford Basin (1)
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Indian Ocean
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Indian Ocean Islands
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Mascarene Islands
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Reunion
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Piton de la Fournaise (1)
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-
International Ocean Discovery Program
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Expedition 349
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Kerguelen Plateau (1)
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stable isotopes
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Mg-26/Mg-24 (1)
-
Nd-144/Nd-143 (17)
-
O-16 (1)
-
O-17/O-16 (1)
-
O-18/O-16 (6)
-
Os-188/Os-187 (1)
-
Pb-206/Pb-204 (3)
-
Pb-207/Pb-204 (3)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-204 (2)
-
Rb-87/Sr-86 (1)
-
S-34/S-32 (4)
-
Sm-147/Nd-144 (2)
-
Sr-87/Sr-86 (21)
-
-
-
large-ion lithophile elements (3)
-
Lu/Hf (1)
-
metals
-
alkali metals
-
lithium (1)
-
potassium (3)
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
sodium (2)
-
-
alkaline earth metals
-
barium (1)
-
calcium (2)
-
magnesium
-
Mg-26/Mg-24 (1)
-
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (21)
-
-
-
aluminum (1)
-
bismuth (1)
-
chromium (3)
-
cobalt (3)
-
copper (5)
-
gallium (2)
-
germanium (1)
-
gold (3)
-
hafnium
-
Hf-177/Hf-176 (2)
-
-
iron
-
ferric iron (5)
-
ferrous iron (3)
-
-
lead
-
Pb-206/Pb-204 (3)
-
Pb-207/Pb-204 (3)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-204 (2)
-
-
manganese (1)
-
nickel (5)
-
niobium (1)
-
platinum group
-
osmium
-
Os-188/Os-187 (1)
-
-
palladium ores (1)
-
platinum (1)
-
platinum ores (6)
-
-
precious metals (2)
-
rare earths
-
dysprosium (1)
-
europium (1)
-
lanthanum (1)
-
neodymium
-
Nd-144/Nd-143 (17)
-
Sm-147/Nd-144 (2)
-
-
samarium
-
Sm-147/Nd-144 (2)
-
-
ytterbium (1)
-
-
silver (2)
-
tantalum (1)
-
titanium (4)
-
vanadium (6)
-
zinc (1)
-
zirconium (2)
-
-
nitrogen (2)
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
helium (1)
-
krypton (1)
-
neon (1)
-
radon (1)
-
xenon (1)
-
-
oxygen
-
O-16 (1)
-
O-17/O-16 (1)
-
O-18/O-16 (6)
-
-
phosphorus (3)
-
silicon (2)
-
sulfur
-
S-34/S-32 (4)
-
-
tellurium (1)
-
-
fossils
-
bacteria (2)
-
borings (1)
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Reptilia
-
Anapsida
-
Testudines (1)
-
-
Diapsida
-
Archosauria
-
Crocodilia (1)
-
dinosaurs (1)
-
-
-
-
-
-
-
ichnofossils (3)
-
Invertebrata
-
Cnidaria
-
Anthozoa (1)
-
-
Mollusca
-
Bivalvia (1)
-
-
Protista
-
Foraminifera (1)
-
-
-
microfossils (1)
-
palynomorphs
-
Dinoflagellata (1)
-
miospores
-
pollen (1)
-
-
-
Plantae (1)
-
-
geochronology methods
-
Ar/Ar (20)
-
fission-track dating (2)
-
K/Ar (9)
-
Lu/Hf (1)
-
paleomagnetism (12)
-
Pb/Pb (1)
-
Rb/Sr (4)
-
Re/Os (1)
-
Sm/Nd (3)
-
tephrochronology (3)
-
U/Pb (17)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Glenns Ferry Formation (1)
-
lower Cenozoic (1)
-
Quaternary
-
Holocene
-
lower Holocene (2)
-
upper Holocene (2)
-
-
Pleistocene
-
Bishop Tuff (1)
-
middle Pleistocene (1)
-
upper Pleistocene
-
Weichselian
-
upper Weichselian
-
Younger Dryas (1)
-
-
-
-
-
upper Quaternary (3)
-
-
Tertiary
-
lower Tertiary (1)
-
middle Tertiary (4)
-
Neogene
-
Deschutes Formation (1)
-
Miocene
-
lower Miocene (2)
-
-
Pliocene (12)
-
-
Paleogene
-
Eocene
-
Chumstick Formation (1)
-
middle Eocene (1)
-
-
Oligocene (5)
-
Paleocene
-
lower Paleocene (2)
-
upper Paleocene (1)
-
-
-
-
upper Cenozoic (2)
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous (3)
-
Middle Cretaceous (1)
-
Upper Cretaceous
-
Campanian (1)
-
Coniacian (1)
-
Javelina Formation (1)
-
Maestrichtian (2)
-
Santonian (1)
-
Senonian (1)
-
Turonian (1)
-
-
-
Jurassic
-
Lower Jurassic (1)
-
Upper Jurassic (1)
-
-
lower Mesozoic (1)
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
-
-
Paleozoic
-
Cambrian (4)
-
Carboniferous
-
Mississippian
-
Upper Mississippian
-
Parkwood Formation (1)
-
Pennington Formation (1)
-
Pride Mountain Formation (1)
-
-
-
Pennsylvanian
-
Pottsville Group (1)
-
-
-
Devonian
-
Upper Devonian (1)
-
-
lower Paleozoic (2)
-
middle Paleozoic (1)
-
Ordovician
-
Upper Ordovician (1)
-
-
Permian
-
Lower Permian (1)
-
Upper Permian
-
Permian-Triassic boundary (1)
-
-
-
Silurian (2)
-
upper Paleozoic (3)
-
-
Precambrian
-
Archean
-
Blake River Group (2)
-
Mesoarchean (2)
-
Neoarchean (2)
-
Paleoarchean (3)
-
Roy Group (1)
-
Yellowknife Group (1)
-
-
Delhi Supergroup (1)
-
Hadean (1)
-
Pongola Supergroup (1)
-
Prichard Formation (1)
-
Purcell System (1)
-
Stillwater Complex (1)
-
upper Precambrian
-
Proterozoic
-
Lewisian (1)
-
Mesoproterozoic
-
Belt Supergroup (1)
-
-
Neoproterozoic
-
Torridonian (1)
-
Vendian (1)
-
-
Paleoproterozoic
-
Birimian (1)
-
Rustenburg Layered Suite (1)
-
Svecofennian (1)
-
Virginia Formation (1)
-
-
-
-
Ventersdorp Supergroup (2)
-
Witwatersrand Supergroup (1)
-
-
-
igneous rocks
-
extrusive rocks (5)
-
igneous rocks
-
carbonatites (2)
-
granophyre (2)
-
kimberlite (5)
-
peperite (2)
-
picrite (2)
-
plutonic rocks
-
anorthosite (6)
-
diabase (8)
-
diorites
-
diorite porphyry (1)
-
ferrodiorite (1)
-
plagiogranite (2)
-
tonalite (2)
-
trondhjemite (1)
-
-
gabbros
-
norite (3)
-
olivine gabbro (1)
-
troctolite (4)
-
-
granites
-
alkali granites (1)
-
A-type granites (3)
-
leucogranite (2)
-
monzogranite (2)
-
-
granodiorites (1)
-
lamproite (1)
-
lamprophyres
-
minette (1)
-
-
monzodiorite (1)
-
monzonites (2)
-
pegmatite (1)
-
quartz monzonite (2)
-
syenites
-
quartz syenite (1)
-
-
ultramafics
-
chromitite (1)
-
peridotites
-
dunite (1)
-
garnet lherzolite (1)
-
harzburgite (2)
-
lherzolite (4)
-
spinel lherzolite (4)
-
spinel peridotite (2)
-
-
pyroxenite (5)
-
-
-
porphyry
-
vitrophyre (1)
-
-
volcanic rocks
-
adakites (1)
-
andesites
-
boninite (3)
-
-
basalts
-
alkali basalts
-
alkali olivine basalt (2)
-
hawaiite (2)
-
mugearite (2)
-
trachybasalts (3)
-
-
flood basalts (4)
-
mid-ocean ridge basalts (17)
-
ocean-island basalts (8)
-
olivine basalt (1)
-
olivine tholeiite (2)
-
shoshonite (4)
-
tholeiite (7)
-
tholeiitic basalt (3)
-
-
basanite (4)
-
benmoreite (1)
-
dacites (10)
-
glasses
-
obsidian (1)
-
palagonite (4)
-
volcanic glass (12)
-
-
komatiite (9)
-
latite (1)
-
phonolites (3)
-
pyroclastics
-
ash-flow tuff (1)
-
hyaloclastite (6)
-
ignimbrite (4)
-
pumice (4)
-
scoria (9)
-
tuff (17)
-
-
rhyodacites (3)
-
rhyolites
-
pantellerite (1)
-
-
tephrite (1)
-
trachyandesites (3)
-
trachytes (2)
-
vitrophyre (1)
-
-
-
ophiolite (10)
-
volcanic ash (9)
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (1)
-
eclogite (4)
-
fulgurite (1)
-
gneisses
-
orthogneiss (1)
-
paragneiss (1)
-
-
hornfels (1)
-
metaigneous rocks
-
meta-andesite (1)
-
metadiabase (1)
-
metakomatiite (2)
-
-
metasedimentary rocks
-
metagraywacke (1)
-
metapelite (2)
-
paragneiss (1)
-
-
metasomatic rocks
-
skarn (1)
-
-
metavolcanic rocks (13)
-
schists
-
blueschist (1)
-
greenstone (2)
-
-
-
ophiolite (10)
-
-
meteorites
-
meteorites
-
Allan Hills Meteorites
-
ALH 84001 (1)
-
-
Northwest Africa Meteorites (2)
-
Queen Alexandra Range Meteorites
-
QUE 94201 (1)
-
-
stony irons
-
lodranite (1)
-
-
stony meteorites
-
acapulcoite (1)
-
achondrites
-
angrite (1)
-
diogenite (1)
-
eucrite
-
Pasamonte Meteorite (1)
-
-
howardite (1)
-
lunar meteorites (1)
-
Martian meteorites
-
ALH 84001 (1)
-
SNC Meteorites
-
chassignite
-
Chassigny Meteorite (1)
-
-
nakhlite
-
Nakhla Meteorite (1)
-
-
shergottite
-
Los Angeles Meteorite (1)
-
QUE 94201 (1)
-
Shergotty Meteorite (2)
-
Zagami Meteorite (1)
-
-
-
-
ureilite (1)
-
-
chondrites
-
carbonaceous chondrites (1)
-
enstatite chondrites (1)
-
-
-
Yamato Meteorites (1)
-
-
-
minerals
-
alabaster (1)
-
alloys
-
carbides
-
moissanite (2)
-
-
nitrides (1)
-
-
carbonates
-
aragonite (1)
-
calcite (4)
-
dolomite (2)
-
hydrotalcite (2)
-
magnesite (1)
-
monohydrocalcite (1)
-
-
minerals (12)
-
native elements
-
diamond (1)
-
graphite (1)
-
-
oxides
-
anatase (1)
-
baddeleyite (1)
-
chrome spinel (4)
-
chromite (4)
-
corundum (1)
-
ferrihydrite (1)
-
hematite (2)
-
hydroxides
-
iron hydroxides (1)
-
oxyhydroxides (2)
-
-
ilmenite (2)
-
iron oxides (7)
-
limonite (1)
-
magnetite (4)
-
niobates
-
fergusonite (1)
-
-
rutile (2)
-
spinel (8)
-
spinel group (1)
-
titanium oxides (6)
-
titanomagnetite (1)
-
wustite (1)
-
-
phosphates
-
apatite (8)
-
chlorapatite (1)
-
fluorapatite (1)
-
merrillite (2)
-
-
platinum minerals (2)
-
silicates
-
aluminosilicates
-
maskelynite (2)
-
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (3)
-
kaersutite (1)
-
-
-
pyroxene group
-
clinopyroxene
-
aegirine (1)
-
augite (3)
-
diopside (4)
-
pigeonite (4)
-
-
orthopyroxene
-
enstatite (1)
-
hypersthene (1)
-
-
-
pyroxferroite (1)
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (2)
-
sanidine (1)
-
-
plagioclase
-
anorthite (3)
-
oligoclase (1)
-
-
-
nepheline group
-
nepheline (1)
-
-
silica minerals
-
agate (1)
-
amethyst (1)
-
cristobalite (2)
-
opal (1)
-
quartz (8)
-
tridymite (2)
-
-
sodalite group
-
hauyne (1)
-
lazurite (1)
-
-
zeolite group
-
analcime (1)
-
chabazite (1)
-
epistilbite (1)
-
harmotome (1)
-
heulandite (1)
-
mesolite (1)
-
natrolite (1)
-
phillipsite (1)
-
scolecite (2)
-
thomsonite (1)
-
wairakite (2)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group
-
majorite (1)
-
pyrope (1)
-
-
kyanite (1)
-
olivine group
-
fayalite (1)
-
forsterite (5)
-
olivine (29)
-
-
titanite group
-
titanite (3)
-
-
zircon group
-
zircon (14)
-
-
-
sorosilicates
-
epidote group
-
clinozoisite (1)
-
epidote (2)
-
zoisite (1)
-
-
lawsonite (2)
-
pumpellyite group
-
pumpellyite (1)
-
-
-
-
sheet silicates
-
cerolite (1)
-
chlorite group
-
chlorite (2)
-
-
clay minerals
-
allophane (1)
-
kaolinite (2)
-
nontronite (2)
-
saponite (4)
-
smectite (10)
-
vermiculite (2)
-
-
gyrolite (1)
-
illite (1)
-
mica group
-
biotite (3)
-
celadonite (1)
-
glauconite (1)
-
phengite (1)
-
phlogopite (1)
-
-
serpentine group
-
serpentine (2)
-
-
-
-
sulfates
-
barite (2)
-
celestine (1)
-
gypsum (2)
-
jarosite (1)
-
lazurite (1)
-
-
sulfides
-
alabandite (1)
-
chalcocite (1)
-
chalcopyrite (2)
-
galena (1)
-
iron sulfides (1)
-
lazurite (1)
-
marcasite (1)
-
niningerite (1)
-
oldhamite (1)
-
pyrite (3)
-
pyrrhotite (2)
-
sphalerite (2)
-
troilite (1)
-
-
-
Primary terms
-
absolute age (44)
-
Africa
-
Blue Nile (1)
-
East Africa
-
Afar Depression (2)
-
Djibouti (1)
-
Ethiopia (3)
-
Ethiopian Rift (1)
-
Kenya
-
Kenya Rift valley (1)
-
-
-
East African Rift (3)
-
Mozambique Belt (1)
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Middle Atlas (1)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
Middle Atlas (1)
-
-
-
-
Southern Africa
-
Barberton greenstone belt (1)
-
Kaapvaal Craton (4)
-
Kalahari Craton (1)
-
Karoo Basin (2)
-
Namibia (2)
-
South Africa
-
Bushveld Complex (3)
-
Cape Province region (1)
-
Northern Cape Province South Africa (1)
-
-
-
West Africa
-
Cameroon
-
Lake Nyos (1)
-
-
Ghana (1)
-
-
West African Craton (1)
-
Zimbabwe Craton (1)
-
-
Antarctica
-
Antarctic Peninsula
-
Graham Land (1)
-
-
East Antarctica (1)
-
James Ross Island (1)
-
South Shetland Islands
-
Deception Island (1)
-
-
Transantarctic Mountains
-
Queen Maud Range (1)
-
-
Victoria Land (1)
-
-
Arctic region
-
Greenland
-
East Greenland (1)
-
Isua Belt (1)
-
Skaergaard Intrusion (3)
-
South Greenland (1)
-
West Greenland (3)
-
-
-
Asia
-
Altai Mountains
-
Mongolian Altai (1)
-
-
Arabian Peninsula
-
Oman (1)
-
-
Baikal rift zone (1)
-
Buryat Russian Federation
-
Vitim Plateau (1)
-
-
Far East
-
China
-
Guangdong China
-
Leizhou Peninsula (1)
-
-
Hainan China (1)
-
Sichuan China (2)
-
South China Block (1)
-
Tarim Platform (1)
-
Xinjiang China (2)
-
Yunnan China (1)
-
-
Indonesia (1)
-
Korea
-
South Korea
-
Cheju Island (2)
-
-
-
Mongolia
-
Mongolian Altai (1)
-
-
Philippine Islands
-
Luzon
-
Mount Pinatubo (2)
-
-
-
Sino-Korean Platform (1)
-
Taiwan (1)
-
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Damodar Valley (1)
-
Deccan Plateau (1)
-
Ghats
-
Eastern Ghats (1)
-
Western Ghats (1)
-
-
Gujarat India
-
Saurashtra (1)
-
-
Jharkhand India (1)
-
Maharashtra India (1)
-
Northeastern India
-
Meghalaya India
-
Garo Hills (1)
-
-
-
Orissa India
-
Koraput India (1)
-
-
Rajasthan India (1)
-
West Bengal India
-
Raniganj India (1)
-
-
-
Indian Shield (1)
-
Kohistan (1)
-
Pakistan
-
Baluchistan Pakistan (2)
-
-
-
Kamchatka Russian Federation
-
Kamchatka Peninsula
-
Tolbachik (1)
-
-
-
Karakoram (1)
-
Kemerovo Russian Federation (1)
-
Krasnoyarsk Russian Federation (1)
-
Kuznetsk Basin (1)
-
Magadan Russian Federation (2)
-
Middle East
-
Cyprus
-
Troodos Massif (1)
-
-
Iran (1)
-
Israel
-
Makhtesh Ramon (1)
-
Negev (1)
-
-
Turkey
-
Anatolia (3)
-
East Anatolian Fault (1)
-
North Anatolian Fault (1)
-
Taurus Mountains (1)
-
-
-
Okhotsk region (1)
-
Okhotsk-Chukchi volcanic belt (2)
-
Sayan (1)
-
Siberia (1)
-
Siberian fold belt (1)
-
Siberian Platform (4)
-
Tajikistan (1)
-
Tibetan Plateau (1)
-
Tien Shan (2)
-
Transbaikalia (1)
-
Tuva Russian Federation (1)
-
West Siberia (1)
-
Zabaykalskiy Russian Federation (1)
-
-
asteroids (1)
-
Atlantic Ocean
-
Mid-Atlantic Ridge (1)
-
North Atlantic
-
Caribbean Sea (1)
-
Faeroe-Shetland Basin (2)
-
Labrador Sea (1)
-
North Sea (1)
-
Northeast Atlantic (2)
-
Porcupine Basin (1)
-
-
-
Atlantic Ocean Islands
-
Canary Islands
-
Hierro (1)
-
-
Faeroe Islands (3)
-
Falkland Islands (1)
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Leg 195
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
basaltic composition
Insights into the chemical evolution of sub-arc magmas from the high-pressure electrical conductivity of basaltic and andesitic magmas Open Access
Highly conductive diatreme aquifer beneath the Cerro Overo maar, Central Andean volcanic zone, Chile Available to Purchase
Solfataric alteration at the South Sulfur Bank, Kilauea, Hawaii, as a mechanism for the formation of sulfates, phyllosilicates, and silica on Mars Open Access
Multistage melt/fluid modification of lithospheric mantle beneath the circum-cratonic orogenic belt: Evidence from the Tuoyun peridotite xenoliths Available to Purchase
What Prevents the Crystallization of Magma from the Roof Downwards in Large Basaltic Magma Chambers? Available to Purchase
New details on the volcanic and tectonic evolution of the Mesoarchaean Dominion Group with special reference to the Syferfontein Formation in the Ottosdal area (South Africa) Available to Purchase
Placing constraints on the age and origin of basaltic dykes on the Ghaap Plateau, Griqualand West, South Africa Available to Purchase
Neoarchean and Paleoproterozoic magmatism in the Longjiang area, NE China: Implications for the recycling history of supracrustal components in the eastern Central Asian Orogenic Belt Available to Purchase
The Early Cenozoic Volcanism of the Northern Okhotsk Region System of Grabens and Faults Available to Purchase
Integrated Universal Soil Loss Equation (USLE) and Geospatial Approach to Assess Soil Erosion in Machhu Sub-watershed, Morbi, India Available to Purchase
Paleozoic evolution of the Yukon-Tanana terrane of the North American Cordillera, NW British Columbia Open Access
Magmatic and Geochemical Studies of Early Neoproterozoic Koraput Anorthosite Massif, Eastern Ghats Mobile Belt and their Implications for Rodinia Assembly Available to Purchase
A far-traveled basalt lava flow in north-central Oregon, USA Open Access
Experimental insight into basaltic andesite lava dome oxidation textures at La Soufrière, St Vincent Open Access
Abstract Petrological analysis of the 2020–21 La Soufrière lava dome reveals ubiquitous oxidation textures. Comparison of the natural dome rock to subsequent explosive scoria phases highlights the lack of any oxidation features in the latter, indicating that oxidation processes affected only the dome-forming magma, either during pre-eruptive storage or upon emplacement. To investigate the causes of oxidation we present a series of one-atmosphere experiments, using fresh natural basaltic andesite scoria as a starting material. Experiments were performed at 900 and 1020°C and at oxygen fugacities between NNO − 2 and air. Experimental results show that iron oxide nanolites nucleate on the rims of pyroxene microlites and phenocrysts under all experimental conditions except at NNO − 2. Orthopyroxene phenocrysts become unstable at 1020°C, at and above NNO + 2. Olivine symplectites form in all experiments at and above NNO. Titanomagnetite co-exsolves titanohematite and an Mg–Fe–Al spinel (pleonaste–magnesioferrite) at and above NNO + 2. Well-developed Mg–Fe–Al spinel trellis exsolution lamellae in titanomagnetite phenocrysts, as seen in the dome, only form in the presence of air at 900°C. The combination of textures and compositions observed in the natural dome indicates that oxidation of the dome magma occurred during emplacement at Earth's surface, with air percolating through the dome at temperatures ≤900°C.
Petrology of the 2020–21 effusive to explosive eruption of La Soufrière Volcano, St Vincent: insights into plumbing system architecture and magma assembly mechanism Open Access
Abstract The 2020–21 eruption of La Soufrière, St Vincent began with extrusion of a viscous lava dome, which was destroyed upon transition to a major explosive phase. Here we present petrological data to reconstruct the processes leading up to these events. Bulk-rock SiO 2 contents range from 52.8 to 55.4 wt%, classifying the lava and the subsequent scoria as basaltic andesite, the latter being slightly more mafic. Macrocrystal chemistry and modes (plag–cpx–opx–tmt–ol) and crystallinity (45–50 vol%) are largely identical for both phases of the eruption. Pyroxenes are homogenous and precipitated mostly from andesitic melts. Conversely, plagioclase shows strong normal zonation resulting from magma ascent and stalling at multiple crustal levels. Clinopyroxene thermobarometry reveals that crystallization predominantly took place between 8 and 13 km depth at temperatures of 997 − 35 + 18 ∘ C . A lack of evidence for mafic recharge and changes in volatile content and the omnipresence of xenoliths, suggests pre-eruptive destabilization of an andesitic–dacitic melt pocket that disrupted and entrained antecedent mush. Olivine diffusion profiles show that this interaction preceded the onset of eruption. Low dissolved sulfur contents (≤270 ppm S) place constraints on the total SO 2 gas release. Melt–mush disruption appears to be a dominant driver of eruptions at La Soufrière. Supplementary material: Supplementary figures and tables, as well as electronic data tables, are available at https://doi.org/10.6084/m9.figshare.c.6484877