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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Antarctica
-
Queen Maud Land (1)
-
Ross Island (1)
-
-
Atlantic Ocean
-
Mid-Atlantic Ridge (1)
-
North Atlantic (1)
-
-
Australasia
-
Australia
-
Lachlan fold belt (1)
-
-
New Zealand (1)
-
-
Caledonides (1)
-
Europe
-
Western Europe
-
Scandinavia
-
Norway (1)
-
-
-
-
Mount Erebus (1)
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Oceania
-
Polynesia
-
Cook Islands (1)
-
-
-
Pacific Ocean (1)
-
Pacific region (1)
-
South Island (1)
-
United States
-
Minnesota
-
Minnesota River valley (1)
-
-
Montana
-
Silver Bow County Montana
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Butte Montana (1)
-
-
-
-
-
commodities
-
metal ores (2)
-
mineral deposits, genesis (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (1)
-
-
chemical ratios (1)
-
isotope ratios (5)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
Pb-206/Pb-204 (5)
-
Pb-207/Pb-204 (3)
-
Pb-208/Pb-204 (2)
-
Sm-147/Nd-144 (1)
-
U-238/Pb-204 (10)
-
-
stable isotopes
-
Ar-40/Ar-39 (1)
-
C-13/C-12 (1)
-
Nd-144/Nd-143 (2)
-
O-18/O-16 (1)
-
Pb-206/Pb-204 (5)
-
Pb-207/Pb-204 (3)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-204 (2)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (1)
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-
-
metals
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actinides
-
thorium (1)
-
uranium
-
U-238/Pb-204 (10)
-
-
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
gold (1)
-
lead
-
Pb-206/Pb-204 (5)
-
Pb-207/Pb-204 (3)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-204 (2)
-
U-238/Pb-204 (10)
-
-
platinum group
-
iridium (1)
-
palladium (1)
-
platinum (1)
-
rhodium (1)
-
ruthenium (1)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (2)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
-
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
radon (1)
-
-
oxygen
-
O-18/O-16 (1)
-
-
-
geochronology methods
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U/Pb (3)
-
-
geologic age
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Cenozoic
-
Quaternary (1)
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
-
-
Paleozoic
-
Cambrian (1)
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lower Paleozoic (1)
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Ordovician (1)
-
-
Precambrian
-
upper Precambrian
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Proterozoic
-
Paleoproterozoic (1)
-
-
-
-
-
igneous rocks
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igneous rocks
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carbonatites (1)
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plutonic rocks
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diorites (1)
-
granites
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I-type granites (1)
-
-
quartz monzonite (1)
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-
volcanic rocks
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basalts
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ocean-island basalts (1)
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-
phonolites (1)
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-
-
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minerals
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carbonates (1)
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silicates
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framework silicates
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feldspar group
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alkali feldspar (1)
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plagioclase (1)
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-
silica minerals
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opal (1)
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-
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orthosilicates
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nesosilicates
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zircon group
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zircon (1)
-
-
-
-
-
sulfides (1)
-
-
Primary terms
-
absolute age (2)
-
Antarctica
-
Queen Maud Land (1)
-
Ross Island (1)
-
-
Atlantic Ocean
-
Mid-Atlantic Ridge (1)
-
North Atlantic (1)
-
-
Australasia
-
Australia
-
Lachlan fold belt (1)
-
-
New Zealand (1)
-
-
carbon
-
C-13/C-12 (1)
-
-
Cenozoic
-
Quaternary (1)
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
-
-
crust (1)
-
Deep Sea Drilling Project
-
Leg 37
-
DSDP Site 332 (1)
-
DSDP Site 335 (1)
-
-
-
deformation (1)
-
Europe
-
Western Europe
-
Scandinavia
-
Norway (1)
-
-
-
-
faults (1)
-
geochemistry (6)
-
geochronology (1)
-
igneous rocks
-
carbonatites (1)
-
plutonic rocks
-
diorites (1)
-
granites
-
I-type granites (1)
-
-
quartz monzonite (1)
-
-
volcanic rocks
-
basalts
-
ocean-island basalts (1)
-
-
phonolites (1)
-
-
-
inclusions (2)
-
intrusions (2)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
Pb-206/Pb-204 (5)
-
Pb-207/Pb-204 (3)
-
Pb-208/Pb-204 (2)
-
Sm-147/Nd-144 (1)
-
U-238/Pb-204 (10)
-
-
stable isotopes
-
Ar-40/Ar-39 (1)
-
C-13/C-12 (1)
-
Nd-144/Nd-143 (2)
-
O-18/O-16 (1)
-
Pb-206/Pb-204 (5)
-
Pb-207/Pb-204 (3)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-204 (2)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (1)
-
-
-
lava (1)
-
magmas (3)
-
mantle (1)
-
metal ores (2)
-
metals
-
actinides
-
thorium (1)
-
uranium
-
U-238/Pb-204 (10)
-
-
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
gold (1)
-
lead
-
Pb-206/Pb-204 (5)
-
Pb-207/Pb-204 (3)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-204 (2)
-
U-238/Pb-204 (10)
-
-
platinum group
-
iridium (1)
-
palladium (1)
-
platinum (1)
-
rhodium (1)
-
ruthenium (1)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (2)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
-
-
metasomatism (1)
-
mineral deposits, genesis (1)
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
radon (1)
-
-
Oceania
-
Polynesia
-
Cook Islands (1)
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
Pacific Ocean (1)
-
Pacific region (1)
-
paleogeography (2)
-
Paleozoic
-
Cambrian (1)
-
lower Paleozoic (1)
-
Ordovician (1)
-
-
petrology (1)
-
plate tectonics (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Paleoproterozoic (1)
-
-
-
-
sedimentary rocks (2)
-
tectonics (1)
-
United States
-
Minnesota
-
Minnesota River valley (1)
-
-
Montana
-
Silver Bow County Montana
-
Butte Montana (1)
-
-
-
-
-
sedimentary rocks
-
sedimentary rocks (2)
-
U-238/Pb-204
Chapter 7.2 Mount Erebus
Abstract Erebus volcano, Antarctica, is the southernmost active volcano on the globe. Despite its remoteness and harsh conditions, Erebus volcano provides an unprecedented and unique opportunity to study the petrogenesis and evolution, as well as the passive and explosive degassing, of an alkaline magmatic system with a persistently open and magma-filled conduit. In this chapter, we review nearly five decades of scientific research related to Erebus volcano, including geological, geophysical, geochemical and microbiological observations and interpretations. Mount Erebus is truly one of the world's most significant natural volcano laboratories where the lofty scientific goal of studying a volcanic system from mantle to microbe is being realized.
Tectonic settings of continental crust formation: Insights from Pb isotopes in feldspar inclusions in zircon
Carbonate Melts and Carbonatites
MIGRATION OF RADIOGENIC LEAD ISOTOPES DURING FORMATION OF MINERALS IN OPEN CAVITIES IN THE PRESENCE OF COLLOIDS: THEORETICAL ASPECTS AS APPLIED TO U-Pb DATING OF YOUNG MINERALS
Age and tectonic setting of the Nesåa Batholith: implications for Ordovician arc development in the Caledonides of Central Norway
Pb-Nd Isotopes Indicate the Origin of Island Arc Terranes in the Early Paleozoic Pacific
Contrasting behavior of noble-metal elements during magmatic differentiation in basalts from the Cook Islands, Polynesia
Lead-isotope investigations in the Minnesota River Valley—Late-tectonic and posttectonic granites
In the Minnesota River Valley, an epizonal, anorogenic granite that is often referred to as the granite of section 28 (lat 44°49.73′N, long 95°33.90′W) has been found to have a Pb-Pb age of 1.84 ± 0.05 b.y. on the basis of data obtained on HF leached and unleached feldspars and HCl leached and unleached whole rocks. The Th-Pb age of the feldspar-whole-rock pair is 1.9 b.y., which is in satisfactory agreement with the Pb-Pb age; but the U-Pb age is greater than the Pb-Pb age and probably indicates that uranium has been leached from the whole rock within the past several hundred million years, perhaps as a consequence of dilatancy resulting from uplift and erosion. Another granite, the mesozonal, late-tectonic Precambrian Sacred Heart Granite in the Minnesota River Valley (lat 44°41.3′N, long 95°21.5′W) is found to have a Pb-Pb age of 2.605 ± 0.006 b.y. on the basis of data obtained on HF leached and unleached feldspars and HCl leached and unleached whole rocks. Both the Th-Pb and U-Pb isochron ages are much older than the Pb-Pb age. An older age was expected for the U-Pb system as it had been previously found in the epizonal granite, but to also find it for the Th-Pb system was surprising. As is predicted for these kinds of granites in this type of tectonic environment on the basis of Mesozoic and Cenozoic analogues, the initial leads in the granites indicate that they were derived from source material having values of 238 U/ 204 Pb <9 normalized to the present day. This feature is common in Mesozoic and Cenozoic igneous rocks penetrating Precambrian terranes but is rarely observed in pre-Mesozoic igneous rocks. The Sacred Heart Granite is the oldest igneous rock known to show this effect and is the first representative of a mesozonal granite. The uranium depletion event appears to have been a granulite-facies metamorphism, but the age of that metamorphism cannot be determined from the available data. The model-lead-age information, however, suggests that it occurred before 2.78 b.y. ago. The source materials for both granites also underwent an earlier stage of extensive but unknown duration during which 238 U/ 204 Pb >9. In Phanerozoic rocks, such values are characteristic of ensialic tectonic environments. Similar development of ensialic environments was apparently occurring also in perancient times.