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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Tanzania (1)
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Southern Africa
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Kaapvaal Craton (1)
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Arctic region
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Asia
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zircon (2)
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Primary terms
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absolute age (1)
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Africa
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East Africa
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Tanzania (1)
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Southern Africa
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Kaapvaal Craton (1)
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Arctic region
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Greenland
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East Greenland (1)
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Asia
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Arabian Peninsula
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Oman (2)
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Himalayas (1)
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Indian Peninsula
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Pakistan (1)
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Karakoram (1)
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brines (1)
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Canada
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Western Canada
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Vancouver Island (1)
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Cenozoic
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Tertiary
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lower Tertiary (1)
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crust (3)
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Deep Sea Drilling Project (1)
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deformation (1)
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geochemistry (2)
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geochronology (1)
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igneous rocks
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plutonic rocks
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diorites (1)
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gabbros
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norite (1)
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ultramafics
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peridotites
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dunite (1)
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harzburgite (1)
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spinel peridotite (1)
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inclusions (1)
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Indian Ocean
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Atlantis II fracture zone (1)
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intrusions (1)
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isotopes
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radioactive isotopes
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Re-187/Os-188 (1)
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stable isotopes
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Os-188/Os-187 (1)
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Re-187/Os-188 (1)
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mantle (2)
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Mesozoic
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Cretaceous (1)
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Jurassic
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Bonanza Group (1)
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Lower Jurassic
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Talkeetna Formation (2)
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Upper Jurassic
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Naknek Formation (1)
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metal ores
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gold ores (1)
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platinum ores (1)
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metals
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alkaline earth metals
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magnesium (1)
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platinum group
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osmium
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Os-188/Os-187 (1)
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Re-187/Os-188 (1)
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palladium (1)
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platinum (1)
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platinum ores (1)
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rhenium
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Re-187/Os-188 (1)
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Mohorovicic discontinuity (1)
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North America
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Canadian Shield
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Slave Province (1)
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Ocean Drilling Program
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ODP Site 735 (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific (1)
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Equatorial Pacific (1)
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plate tectonics (1)
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Precambrian
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sedimentary rocks (1)
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structural analysis (1)
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sulfur (1)
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tectonics
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United States
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Alaska
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Chugach Mountains (1)
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Talkeetna Mountains (2)
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Wyoming (1)
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waste disposal (1)
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weathering (1)
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rock formations
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Semail Ophiolite (2)
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sedimentary rocks
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sedimentary rocks (1)
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Carbon Mineralization: From Natural Analogues to Engineered Systems
Rhenium-osmium isotope systematics and platinum group element concentrations in oceanic crust
Investigation of the strength contrast at the Moho: A case study from the Oman Ophiolite
Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene
Six samples collected from pre-, syn-, and post-Talkeetna arc units in south-central Alaska were dated using single-grain zircon LA-MC-ICP-MS geochronology to assess the age of arc volcanism and the presence and age of any inherited components in the arc. The oldest dated sample comes from a volcanic breccia at the base of the Talkeetna Formation on the Alaska Peninsula and indicates that initial arc volcanism began by 207 ± 5 Ma. A sedimentary rock overlying the volcanic section in the Talkeetna Mountains has a maximum depositional age of <167 Ma. This is in agreement with biochronologic ages for the top of the Talkeetna Formation, suggesting that the Talkeetna arc was active for ca. 40 m.y. Three samples from interplutonic screens and roof pendants in the Jurassic batholith on the Alaska Peninsula provide information about the tectonic setting of Talkeetna arc magmatism. All three samples contain Paleozoic to Proterozoic zircons and require that arc magmas on the Alaska Peninsula intruded into detritus that contained older continental zircons. This finding is distinct from observations from eastern exposures of the arc in the Chugach and Talkeetna Mountains, where there is only limited evidence for pre-Paleozoic zircons, and it suggests that there were along-strike variations in the tectonic setting of the arc.