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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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Congo Craton (1)
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East Africa
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Kenya (1)
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Tanzania (1)
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Southern Africa
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South Africa (1)
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Asia
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Sayan
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Eastern Sayan (1)
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Siberia (2)
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Siberian Platform
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Anabar Shield (1)
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Western Transbaikalia (1)
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Yakutia Russian Federation
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Anabar Shield (1)
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Atlantic Ocean
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South Atlantic (1)
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Australasia
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Australia (1)
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Canada
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Mackenzie Mountains (1)
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Commonwealth of Independent States
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Russian Federation
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Siberian Platform
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Western Transbaikalia (1)
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Yakutia Russian Federation
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Anabar Shield (1)
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False Bay (1)
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Franklin Mountains (1)
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South America
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Brazil
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commodities
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metal ores
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copper ores (1)
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nickel ores (1)
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platinum ores (1)
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elements, isotopes
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large-ion lithophile elements (1)
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metals
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platinum group
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platinum ores (1)
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rare earths (3)
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geochronology methods
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Ar/Ar (1)
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U/Pb (3)
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geologic age
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Paleozoic
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Cambrian (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic (2)
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Neoproterozoic (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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anorthosite (1)
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gabbros (1)
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ultramafics (1)
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volcanic rocks
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basalts
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flood basalts (1)
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mid-ocean ridge basalts (2)
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ocean-island basalts (1)
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minerals
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platinum minerals (1)
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (2)
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Primary terms
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absolute age (3)
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Africa
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Congo Craton (1)
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East Africa
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Kenya (1)
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Tanzania (1)
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Southern Africa
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South Africa (1)
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Asia
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Sayan
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Eastern Sayan (1)
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Siberia (2)
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Siberian Platform
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Anabar Shield (1)
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Western Transbaikalia (1)
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Yakutia Russian Federation
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Anabar Shield (1)
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Atlantic Ocean
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South Atlantic (1)
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Australasia
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Australia (1)
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Canada
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Mackenzie Mountains (1)
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crust (1)
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igneous rocks
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plutonic rocks
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anorthosite (1)
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gabbros (1)
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ultramafics (1)
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volcanic rocks
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basalts
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flood basalts (1)
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mid-ocean ridge basalts (2)
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ocean-island basalts (1)
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intrusions (2)
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mantle (1)
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metal ores
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copper ores (1)
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nickel ores (1)
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platinum ores (1)
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metals
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platinum group
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platinum ores (1)
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rare earths (3)
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Paleozoic
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Cambrian (1)
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plate tectonics (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic (2)
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Neoproterozoic (1)
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South America
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Brazil
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Sao Francisco Craton (1)
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The Greater Cederberg–False Bay Large Igneous Province in South Africa: A southern node of widespread magmatism associated with South Atlantic rifting
Relationship between platinum-bearing ultramafic–mafic intrusions and large igneous provinces ( exemplified by the Siberian Craton )
The 1501 Ma Kuonamka Large Igneous Province of northern Siberia: U–Pb geochronology, geochemistry, and links with coeval magmatism on other crustal blocks
Return to Rodinia? Moderate to high palaeolatitude of the São Francisco/Congo craton at 920 Ma
Abstract Moderate to high palaeolatitudes recorded in mafic dykes, exposed along the coast of Bahia, Brazil, are partly responsible for some interpretations that the São Francisco/Congo craton was separate from the low-latitude Rodinia supercontinent at about 1050 Ma. We report new palaeomagnetic data that replicate the previous results. However, we obtain substantially younger U–Pb baddeleyite ages from five dykes previously thought to be 1.02–1.01 Ga according to the 40 Ar/ 39 Ar method. Specifically, the so-called ‘A-normal’ remanence direction from Salvador is dated at 924.2±3.8 Ma, within error of the age for the ‘C’ remanence direction at 921.5±4.3 Ma. An ‘A-normal’ dyke at Ilhéus is dated at 926.1±4.6 Ma, and two ‘A-normal’ dykes at Olivença have indistinguishable ages with best estimate of emplacement at 918.2±6.7 Ma. We attribute the palaeomagnetic variance of the ‘A-normal’ and ‘C’ directions to lack of averaging of geomagnetic palaeosecular variation in some regions. Our results render previous 40 Ar/ 39 Ar ages from the dykes suspect, leaving late Mesoproterozoic palaeolatitudes of the São Francisco/Congo craton unconstrained. The combined ‘A-normal’ palaeomagnetic pole from coastal Bahia places the São Francisco/Congo craton in moderate to high palaeolatitudes at c. 920 Ma, allowing various possible positions of that block within Rodinia.