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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Arabian Peninsula
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Saudi Arabia (1)
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Atlantic Ocean
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North Atlantic
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Australasia
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Canada
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Texas
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Wisconsin (2)
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commodities
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copper ores (9)
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IOCG deposits (5)
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iron ores (12)
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lead ores (24)
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lead-zinc deposits (30)
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manganese ores (1)
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rare earth deposits (4)
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silver ores (2)
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uranium ores (1)
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mineral deposits, genesis (29)
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phosphate deposits (4)
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elements, isotopes
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carbon
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chemical elements (1)
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halogens
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hydrogen
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D/H (2)
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deuterium (1)
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isotope ratios (5)
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isotopes
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Be-10 (1)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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C-13/C-12 (2)
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D/H (2)
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deuterium (1)
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Fe-56/Fe-54 (1)
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He-4/He-3 (1)
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Ne-22/Ne-20 (1)
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O-18/O-16 (5)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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S-34/S-32 (3)
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Sr-87/Sr-86 (3)
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metals
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actinides
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thorium (1)
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uranium (1)
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alkali metals
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potassium (2)
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sodium (1)
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alkaline earth metals
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barium (2)
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beryllium
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Be-10 (1)
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strontium
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Sr-87/Sr-86 (3)
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iron
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Fe-56/Fe-54 (1)
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lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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manganese (1)
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dysprosium (1)
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ytterbium (1)
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titanium (1)
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noble gases
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helium
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He-4/He-3 (1)
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neon
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oxygen
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O-18/O-16 (5)
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S-34/S-32 (3)
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Invertebrata
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Cnidaria
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Echinodermata
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Mollusca
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Porifera
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Protista
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microfossils
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Conodonta (2)
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Plantae
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geochronology methods
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U/Pb (6)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene
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upper Quaternary (1)
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Tertiary
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Neogene
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Paleogene
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lower Eocene
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Thebes Formation (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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Paleozoic
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Cambrian
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Lower Cambrian (1)
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Bonneterre Formation (27)
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Carboniferous
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Lower Mississippian
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Upper Mississippian
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Warsaw Formation (1)
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Pennsylvanian
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Middle Devonian
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Maquoketa Formation (1)
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Permian
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Lower Permian (1)
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Silurian
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Lower Silurian (1)
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upper Paleozoic (1)
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Phanerozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic
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igneous rocks
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silicates
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pyroxene group
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clinopyroxene (1)
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framework silicates
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alkali feldspar
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K-feldspar (3)
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silica minerals
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quartz (3)
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orthosilicates
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garnet group (1)
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titanite group
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titanite (1)
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zircon group
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zircon (7)
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sorosilicates
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epidote group
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ring silicates
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tourmaline group (1)
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sheet silicates
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chlorite group
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clay minerals
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illite (2)
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sulfides
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Primary terms
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absolute age (13)
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Asia
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Arabian Peninsula
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Saudi Arabia (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Cadiz (1)
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Australasia
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Australia
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South Australia
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Gawler Craton (1)
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barite deposits (4)
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brines (7)
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Canada
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Western Canada
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carbon
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C-13/C-12 (2)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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Kansan (1)
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lower Pleistocene (1)
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upper Pleistocene
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Wisconsinan
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Woodfordian (1)
-
-
-
-
upper Quaternary (1)
-
-
Tertiary
-
Neogene
-
Pliocene (1)
-
-
Paleogene
-
Eocene
-
lower Eocene
-
Thebes Formation (1)
-
-
-
-
-
-
chemical analysis (1)
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Chordata
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Vertebrata (1)
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clay mineralogy (1)
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crystal chemistry (1)
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hydrogen
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D/H (2)
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deuterium (1)
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ichnofossils (1)
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igneous rocks
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plutonic rocks
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diabase (2)
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diorites (1)
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gabbros (2)
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granites
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aplite (1)
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felsite (1)
-
-
syenites (1)
-
-
porphyry (1)
-
volcanic rocks
-
pyroclastics
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ash-flow tuff (1)
-
ignimbrite (1)
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tuff (3)
-
-
rhyolites (11)
-
-
-
inclusions
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fluid inclusions (5)
-
-
intrusions (15)
-
Invertebrata
-
Arthropoda
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Mandibulata
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Crustacea
-
Ostracoda (1)
-
-
-
Trilobitomorpha
-
Trilobita
-
Ptychopariida (1)
-
-
-
-
Brachiopoda (1)
-
Cnidaria
-
Anthozoa
-
Zoantharia
-
Tabulata (1)
-
-
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (3)
-
-
-
Mollusca
-
Gastropoda (2)
-
Monoplacophora (1)
-
-
Porifera
-
Stromatoporoidea (1)
-
-
Protista
-
Foraminifera (2)
-
Radiolaria (1)
-
-
-
isotopes
-
radioactive isotopes
-
Be-10 (1)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
stable isotopes
-
C-13/C-12 (2)
-
D/H (2)
-
deuterium (1)
-
Fe-56/Fe-54 (1)
-
He-4/He-3 (1)
-
Ne-22/Ne-20 (1)
-
O-18/O-16 (5)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
S-34/S-32 (3)
-
Sr-87/Sr-86 (3)
-
-
-
magmas (5)
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous (1)
-
-
-
metal ores
-
base metals (3)
-
cobalt ores (1)
-
copper ores (9)
-
gold ores (5)
-
IOCG deposits (5)
-
iron ores (12)
-
lead ores (24)
-
lead-zinc deposits (30)
-
manganese ores (1)
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nickel ores (1)
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rare earth deposits (4)
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silver ores (2)
-
uranium ores (1)
-
zinc ores (5)
-
-
metals
-
actinides
-
thorium (1)
-
uranium (1)
-
-
alkali metals
-
potassium (2)
-
sodium (1)
-
-
alkaline earth metals
-
barium (2)
-
beryllium
-
Be-10 (1)
-
-
strontium
-
Sr-87/Sr-86 (3)
-
-
-
iron
-
Fe-56/Fe-54 (1)
-
-
lead
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
manganese (1)
-
rare earths
-
cerium (1)
-
dysprosium (1)
-
europium (1)
-
ytterbium (1)
-
yttrium (1)
-
-
titanium (1)
-
zirconium (1)
-
-
metamorphic rocks
-
metasomatic rocks
-
greisen (1)
-
skarn (1)
-
-
phyllites (1)
-
-
metamorphism (1)
-
metasomatism (7)
-
mineral deposits, genesis (29)
-
mineral exploration (6)
-
mineralogy (4)
-
minerals (7)
-
mining geology (1)
-
noble gases
-
helium
-
He-4/He-3 (1)
-
-
neon
-
Ne-22/Ne-20 (1)
-
-
-
North America
-
Appalachians
-
Piedmont (1)
-
-
Basin and Range Province (1)
-
Canadian Shield
-
Grenville Province (1)
-
-
-
oxygen
-
O-18/O-16 (5)
-
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paleobotany (1)
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paleoecology (2)
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paleogeography (1)
-
paleomagnetism (2)
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paleontology (9)
-
Paleozoic
-
Cambrian
-
Lower Cambrian (1)
-
Upper Cambrian
-
Bonneterre Formation (27)
-
Lamotte Sandstone (9)
-
Maynardville Limestone (1)
-
-
-
Carboniferous
-
Mississippian
-
Lower Mississippian
-
Osagian
-
Burlington Limestone (1)
-
-
-
Upper Mississippian
-
Meramecian
-
Warsaw Formation (1)
-
-
-
-
Pennsylvanian
-
Upper Pennsylvanian (1)
-
-
-
Devonian
-
Lower Devonian
-
Gedinnian (1)
-
-
Middle Devonian
-
Saint Laurent Limestone (1)
-
-
-
Ordovician
-
Lower Ordovician (3)
-
Middle Ordovician (1)
-
Upper Ordovician
-
Cincinnatian
-
Richmondian (1)
-
-
Maquoketa Formation (1)
-
-
-
Permian
-
Lower Permian (1)
-
-
Silurian
-
Lower Silurian (1)
-
Middle Silurian
-
Clinton Group (1)
-
-
Upper Silurian
-
Ludlow (1)
-
-
-
upper Paleozoic (1)
-
-
palynomorphs
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acritarchs (1)
-
-
paragenesis (10)
-
petrology (11)
-
Phanerozoic (1)
-
phase equilibria (1)
-
phosphate deposits (4)
-
Plantae
-
algae (1)
-
-
plate tectonics (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
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Mesoproterozoic
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Gawler Range Volcanics (1)
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Neoproterozoic (2)
-
-
-
-
remote sensing (3)
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Late Quaternary–Recent intraplate topographic uplift of the St. Francois Mountains (Ozark Plateau), Missouri (USA), driven by differential density and erosion
ZIRCON TRACE ELEMENT GEOCHEMISTRY AS AN INDICATOR OF MAGMA FERTILITY IN IRON OXIDE COPPER-GOLD PROVINCES
Paleotopography controls weathering of Cambrian-Age profiles beneath the great unconformity, St. Francois Mountains, SE Missouri, U.S.A.
Petrology and volcanology of the Mesoproterozoic igneous rocks of the Saint Francois Mountains terrane, southeast Missouri, USA
ABSTRACT The Saint Francois Mountains are the physiographic expression of the central part of the Ozark Dome of southeastern Missouri. The mountains are made up of a quaquaversal-dipping series of Paleozoic units cored by the Mesoproterozoic-aged rocks of the broader Saint Francois Mountains terrane. The Saint Francois Mountains terrane lies within the Eastern Granite-Rhyolite province along the eastern margin of Laurentia and contains at least four mapped caldera complexes (Eminence, Lake Killarney, Butler Hill, and Taum Sauk), associated volcanic and volcaniclastic rocks, and four distinct types of intrusive units. The Mesoproterozoic rocks represent two major pulses of magmatic activity: (1) an older 1.48–1.45 Ga episode of caldera-forming volcanism and associated subvolcanic to massif-type granitic intrusions; and (2) a younger 1.33–1.28 Ga episode of bimodal intrusions. Volcanism included primarily high-silica rhyolite and volcaniclastic sediments associated with caldera-forming volcanism with lesser amounts of basalt and basaltic andesite that formed as flows and subvolcanic intrusions. The older (ca. 1.4 Ga) intrusive rocks can be divided into three broad categories: (1) granite massifs including the Butler Hill/Breadtray massif-type granites, (2) caldera ring–type granites such as the Silvermine Granite, and (4) mafic- to intermediate-composition intrusive rocks such as the Silver Mines Mafic Series. The younger (ca. 1.3 Ga) bimodal intrusions are represented by the highly evolved felsic Graniteville-types granites and the gabbros of the Skrainka Mafic Group. This field guide provides an overview of the magmatic history of the Mesoproterozoic rocks exposed in the eastern Saint Francois Mountains. Field-trip stops are divided into two days, highlighting well-known stops and lesser-known localities that illustrate the magmatic activity of one the premier igneous locations in the midcontinent region. The field trip is focused on two main areas. Day 1 focuses on the rhyolite sequence and associated caldera-forming eruption of the Taum Sauk caldera. Day 2 focuses on the volcanic rocks and granitic intrusions related to the Butler Hill caldera and ends with a visit to one of the youngest granitoids in the terrane, the Graniteville Granite. The field guide presents a summary of the volcanic history and petrogenesis of the Saint Francois Mountains rhyolites and granites.