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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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Djibouti (1)
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North Africa
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Invertebrata
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nesosilicates
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zircon group
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zircon (4)
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sheet silicates
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clay minerals (1)
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mica group
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sulfides
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Primary terms
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absolute age (24)
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Africa
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carbon
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Caribbean region
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Cenozoic
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upper Cenozoic (4)
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Central America
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continental drift (10)
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Deep Sea Drilling Project
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IPOD
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Leg 62
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Leg 17
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DSDP Site 167 (1)
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economic geology (6)
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Highland region Scotland
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faults (29)
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igneous rocks
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pyroclastics
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rhyolites (1)
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inclusions
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intrusions (29)
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Invertebrata
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Protista
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ionosphere (1)
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isotopes
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C-14 (5)
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stable isotopes
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C-13/C-12 (2)
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D/H (1)
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O-18/O-16 (3)
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Sr-87/Sr-86 (2)
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lava (8)
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mantle (3)
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Mediterranean Sea
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West Mediterranean
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Aptian (2)
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Middle Cretaceous (2)
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Campanian (1)
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Elkhorn Mountains Volcanics (1)
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K-T boundary (2)
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Ladd Formation (1)
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Senonian (1)
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Two Medicine Formation (1)
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Williams Formation (1)
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-
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Jurassic
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Coast Range Ophiolite (1)
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Lower Jurassic
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Hampden Basalt (1)
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Holyoke Basalt (1)
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Middle Jurassic (1)
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Newark Supergroup (1)
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Triassic
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Muschelkalk (1)
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Upper Triassic
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Stuhini Group (1)
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metal ores
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metals
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strontium
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Sr-87/Sr-86 (2)
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metamorphic rocks
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Mexico
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mineral deposits, genesis (11)
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North America
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Basin and Range Province
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Disturbed Belt (1)
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Rocky Mountains foreland (1)
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Western Interior (1)
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Ocean Drilling Program
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Leg 138
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ODP Site 844 (1)
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ODP Site 845 (1)
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ocean floors (1)
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Oceania
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Melanesia
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Fiji
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Viti Levu (1)
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-
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Micronesia
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Caroline Islands (1)
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Polynesia
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Hawaii
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Hawaii County Hawaii
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Hawaii Island
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Kilauea (1)
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Mauna Kea (1)
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Mauna Loa (1)
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-
-
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oil and gas fields (3)
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orogeny (10)
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oxygen
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O-18/O-16 (3)
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Pacific Coast (2)
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Cocos Ridge (1)
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Middle America Trench (1)
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North Pacific
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Mid-Pacific Mountains (1)
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South Pacific (1)
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paleoclimatology (5)
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paleogeography (17)
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paleomagnetism (149)
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Paleozoic
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Arbuckle Group (1)
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Cambrian
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Lower Cambrian (2)
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Carboniferous
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Lower Carboniferous
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Dinantian (2)
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Mississippian
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Lower Mississippian
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Osagian
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Burlington Limestone (1)
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Keokuk Limestone (1)
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-
-
Upper Mississippian
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Meramecian
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Warsaw Formation (1)
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-
-
-
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Devonian
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Keg River Formation (1)
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Lower Devonian (1)
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Middle Devonian
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Prairie Evaporite (1)
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Swan Hills Formation (1)
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Upper Devonian (1)
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lower Paleozoic (2)
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Ordovician
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Lower Ordovician
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Saint George Group (1)
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Middle Ordovician
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Everton Formation (1)
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Table Head Group (1)
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Tetagouche Group (1)
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Permian
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Cutler Formation (1)
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Lower Permian (3)
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Silurian
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Lower Silurian (2)
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Upper Silurian
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Pridoli (1)
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palynomorphs
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paragenesis (2)
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Plantae
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algae
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nannofossils (4)
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plate tectonics (27)
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Precambrian
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Archean
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Blake River Group (1)
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Neoarchean (1)
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Timiskaming Group (1)
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Eocambrian (1)
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Nipissing Diabase (1)
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Nonesuch Shale (1)
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upper Precambrian
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Proterozoic
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Huronian (1)
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Keweenawan
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Copper Harbor Conglomerate (1)
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Mesoproterozoic
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Belt Supergroup (1)
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Freda Sandstone (1)
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Neoproterozoic
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Hadrynian
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Fourchu Group (1)
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Marinoan (1)
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Paleoproterozoic (2)
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Windermere System (1)
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-
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reefs (1)
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remote sensing (1)
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sedimentary rocks
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chemically precipitated rocks
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coal
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sedimentary structures
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sedimentation (4)
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sediments
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gyttja (1)
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soil mechanics (1)
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South America
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Amazon Basin (1)
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Peru (1)
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stratigraphy (51)
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structural geology (7)
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tectonophysics (9)
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United States
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Arizona
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Colorado
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Hawaii
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Mauna Loa (1)
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Idaho (2)
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Michigan
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Minnesota (2)
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Mojave Desert (3)
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Walker Lane (2)
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Western U.S. (4)
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volcanology (1)
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sedimentary rocks
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chemically precipitated rocks
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clastic rocks
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magnetic declination
New Insights into Interpretation of Aeromagnetic Data for Distribution of Igneous Rocks in Central Iran
A 4500 year record of palaeomagnetic secular variation and relative palaeointensity from the Tyrrhenian Sea
Abstract A marine sediment core from the western Mediterranean provides a new high-resolution 4500 year record of palaeomagnetic secular variation and relative palaeointensity. In 2013, the 7.1 m C5 core was recovered from the Tyrrhenian Sea as part of the NextData climate data project. The coring site, 15 km offshore from the Volturno river mouth, is well located to record combined marine and terrestrial palaeoclimatic influences, and the fine-grained, rapidly deposited sediments are effective palaeomagnetic recorders. We investigate the palaeomagnetic field direction and strength recorded in the core, which provide a valuable high-resolution record of Holocene geomagnetic variation in the area. Using rock magnetic techniques, we constrain the magnetic mineralogy of the studied sediments and confirm their suitability for palaeomagnetic analysis. Palaeomagnetic declination and inclination records were determined by stepwise alternating-field demagnetization, and relative palaeointensity estimates were obtained based on normalization to anhysterestic and isothermal remanent magnetization and to magnetic susceptibility. The age of the core is well constrained with a tephra and biostratigraphic age model, and its magnetic records are compared with relevant core and model data for the region, demonstrating that our record is compatible with previous results from the area. An automated curve matching approach is applied to assess the compatibility of our data with the existing secular variation path for the Mediterranean area.
The IDQ curve: A tool for evaluating the direction of remanent magnetization from magnetic anomalies
Paleomagnetic and magnetic fabric data from Lower Triassic redbeds of the Central Western Carpathians: new constraints on the paleogeographic and tectonic evolution of the Carpathian region
Aeromagnetic high-resolution survey over the Vendom Fiord region, Ellesmere Island, Canadian High Arctic
ABSTRACT Within the Canadian High Arctic, Ellesmere Island represents a key region for improving our understanding of the plate tectonic configuration during the Paleogene times when Arctic Canada and Greenland represented two independently moving plates. Here, we present 4050 line kilometers of new high-resolution aeromagnetic data gathered across an area of 7000 km 2 in the Vendom Fiord region on southern Ellesmere Island. The survey was flown with a two-kilometer line spacing and covered sedimentary rocks of the Franklinian Basin and the partly ice-covered basement rocks of the Inglefield Uplift. Magnetic domains, major lineaments, and depths of magnetic sources as well as magnetic trend lines are detected from total field data. These data and additional ground-based magnetic susceptibility measurements are integrated with exposure information and structural data in order to distinguish whether or not the ca. NNE–SSW trending Vendom Fiord Fault Zone can be related to the Wegener Fault. In addition, high-resolution aeromagnetic data and digital enhancement provide support for early Eocene deformation in the Vendom Fiord region during “Eurekan stage 1,” which seems to be decoupled from Paleocene to early Eocene deformation along the Wegener Fault. A distinct NNE–SSW trending magnetic anomaly characterized by long wavelength is bordered by the Eurekan Fold-and-Thrust Belt in the western survey area. On a regional scale, this anomaly can be traced toward the NE where it represents the boundary between the deep water and shelf sequences of the Franklinian Basin along the Archer Fiord Fault Zone. Based on aeromagnetic anomaly data, the ice-covered boundary between sediments of the Franklinian Basin and the Precambrian basement is identified. High frequency anomalies east of this boundary characterize the basement rocks and show strong similarities to the Kane Basin region in the NE. The similarity of magnetic anomaly patterns in both regions indicates that the NNE–SSW trend of the fault zones in the study area west of the Inglefield Uplift turns continuously into an E–W trend north of the uplift in the Kane Basin region.
40 Ar/ 39 Ar and paleomagnetic constraints on the age and areal extent of the Picabo volcanic field: Implications for the Yellowstone hotspot
Magnetostratigraphy of Upper Cretaceous (Lancian) to Middle Paleocene (Tiffanian) strata in the northeastern Crazy Mountains Basin, Montana, U.S.A.
ABSTRACT A 200-m-thick, near-vertical, middle Miocene (ca. 14 Ma), gabbroic sheeted intrusion in the Muroto area of the Shimanto accretionary complex of southwest Japan yields anisotropy of magnetic susceptibility (AMS) showing a magnetic foliation for the minimum axis (K min ) oblique (by ~70°) to the perpendicular of the intrusive contact. Assuming the K min axis represents the paleovertical axis, these data suggest that the gabbroic sheet was not intruded into the host sediments horizontally. Paleomagnetic measurements of the gabbroic intrusion show an in situ mean direction of reversed polarity (declination/inclination [Dec/Inc] = 287°/–65°, α 95 = 3°) that is considerably different from the expected, reversed-polarity dipole-field direction of this region (Dec/Inc = 0°/–56°). A structural analysis combining the paleomagnetic and AMS data led to the determination of a unique pole of rotation, around which the dike can be back-rotated to its initial orientation. The magnitude of rotation necessary for the in situ paleomagnetic direction to be back-rotated to the expected direction is ~60°, which is consistent with the rotation required for the K min axis to be vertical. This consistency can be regarded as independent support for our interpretation of the AMS results and the reliability of the paleomagnetic data. Consequently, we propose that the Muroto gabbro was intruded when the paleo–trench-fill sediments had been tilted landward by ~20°, presumably by accretion, and that the gabbro might have been intruded as a sill-like sheet along a structurally weak zone, possibly part of the frontal thrust plane in the Shimanto accretionary prism.