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all geography including DSDP/ODP Sites and Legs
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Africa
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Cape Verde Islands (1)
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East Africa
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Uganda (1)
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Southern Africa
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Namibia
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West Africa
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Asia
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oxygen
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fossils
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Vertebrata
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Reptilia
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Squamata (1)
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Invertebrata
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Porites (1)
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Mollusca
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Protista
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Foraminifera
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Rotaliina
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geologic age
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Tertiary
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Mesozoic
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pegmatite (4)
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lherzolite (4)
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pyroxenite
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garnet pyroxenite (1)
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volcanic rocks
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basalts
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alkali basalts
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trachybasalts (1)
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flood basalts (1)
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ocean-island basalts (1)
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tholeiite (1)
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nephelinite
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phonolites (1)
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ophiolite (2)
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rutile (2)
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Primary terms
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absolute age (9)
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Africa
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Cape Verde Islands (1)
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East Africa
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Uganda (1)
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Southern Africa
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Namibia
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Walvis Bay Namibia (1)
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South Africa
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Northern Cape Province South Africa
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Kimberley South Africa (1)
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-
-
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West Africa
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Ghana (1)
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Ivory Coast (2)
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Antarctica
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East Antarctica (1)
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Mac Robertson Land
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Prince Charles Mountains (1)
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-
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Asia
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Arabian Peninsula
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Oman (1)
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Central Asia
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Kazakhstan
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Kokchetav Kazakhstan
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Kokchetav Massif (1)
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Far East
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China
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Hebei China
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Yanshan Range (1)
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North China Platform (2)
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Sulu Terrane (1)
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Korea
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Indian Peninsula
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India
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Gujarat India
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Irkutsk Russian Federation (1)
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Kamchatka Russian Federation
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Kamchatka Peninsula
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Krasnoyarsk Russian Federation (1)
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Tajikistan (1)
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Tien Shan (2)
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Udokan Mountains (1)
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Yakutia Russian Federation (1)
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Amazon Fan (1)
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Caribbean Sea (1)
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Ceara Rise (1)
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North Sea (1)
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Straits of Florida (1)
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South Atlantic
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Brazil Basin (1)
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Rio Grande Rise (1)
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Southwest Atlantic (6)
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Walvis Ridge (1)
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West Atlantic (2)
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-
Atlantic Ocean Islands
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Cape Verde Islands (1)
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Australasia
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Australia
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South Australia
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Spencer Gulf (1)
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Western Australia (1)
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Papua New Guinea (1)
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bibliography (1)
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biography (1)
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carbon
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C-14 (2)
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Cenozoic
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Quaternary
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Holocene (3)
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Tertiary
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Neogene
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Miocene (3)
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Pliocene (1)
-
-
Paleogene
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Paleocene (1)
-
-
-
-
Chordata
-
Vertebrata
-
Tetrapoda
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Reptilia
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Diapsida
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Lepidosauria
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Squamata (1)
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construction materials (1)
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Southern Europe
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Italy
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pyroxenite
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websterite (1)
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volcanic rocks
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basalts
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alkali basalts
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trachybasalts (1)
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flood basalts (1)
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ocean-island basalts (1)
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tholeiite (1)
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tholeiitic basalt (1)
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basanite
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ankaramite (1)
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nephelinite
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phonolites (1)
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trachytes (3)
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inclusions
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Indian Ocean
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intrusions (6)
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Invertebrata
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Cnidaria
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Anthozoa
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Fernando de Noronha
ASSESSMENT OF WATER QUALITY IN COASTAL WATERS OF FERNANDO DE NORONHA, BRAZIL: BIOMARKER ANALYSES IN AMPHISTEGINA LESSONII Available to Purchase
OXYKINOSHITALITE, A NEW SPECIES OF MICA FROM FERNANDO DE NORONHA ISLAND, PERNAMBUCO, BRAZIL: OCCURRENCE AND CRYSTAL STRUCTURE Available to Purchase
Structure and diagenesis of Recent algal-foraminifer reefs, Fernando de Noronha, Brazil Available to Purchase
Taphonomic conditions of Amphistegina spp. at Fernando de Noronha (pie ch... Available to Purchase
Multi-dimensional scaling (MDS) of Fernando de Noronha faunal assemblages b... Available to Purchase
Box-whisker plots of foraminiferal faunal patterns for Fernando de Noronha ... Available to Purchase
Sedimentologic variables measured at each station of Fernando de Noronha (A... Available to Purchase
Sampling sites off the north shore of Fernando de Noronha Island, northeast... Available to Purchase
Sediment Distribution in Western Atlantic Off Northern Brazil—Structural Controls and Evolution Available to Purchase
The Equatorial Mid-Ocean Canyon: A relict deep-sea channel on the Brazilian continental margin Available to Purchase
Geochronology (Ar/Ar and K–Ar) of the South Atlantic post-break-up magmatism Available to Purchase
Abstract This work integrates the available geological information and geochronology data for the Cretaceous–Recent magmatism in the South Atlantic, represented by onshore and offshore magmatic events, including the oceanic islands along the transform faults and near the mid-ocean ridge. The analysis of the igneous rocks and their tectonic settings allows new insights into the evolution of the African and Brazilian continental margins during the South Atlantic opening. Following the abundant volcanism in the Early Cretaceous, the magmatic quiescence during the Aptian–Albian times is a common characteristic of almost all Brazilian and West African marginal basins. However, rocks ascribed to the Cabo Granite (104 Ma) are observed in NE Brazil. In West Africa, sparse Aptian–Albian ages are observed in a few coastal igneous centres. In the SE Brazilian margin, an east–west alkaline magmatic trend is observed from Poços de Caldas to Cabo Frio, comprising igneous intrusions dated from 87 to 64 Ma. Mafic dyke swarms trending NW also occur in the region extending from the Cabo Frio Province towards the Central Brazilian Craton. On the West African side, Early Cretaceous–Recent volcanism is observed in the Walvis Ridge (139 Ma), the St Helena Ridge (81 Ma) and the Cameroon Volcanic Line (Early Tertiary–Recent). Volcanic islands such as Ascencion (1.0–0.65 Ma), Tristão da Cunha (2.5–0.13 Ma) and the St Helena islands (12 Ma) most probably correspond to mantle plumes or hot spots presently located near the mid-Atlantic spreading centre. Within the South America platform and deep oceanic regions, the following volcanic islands are observed: the Rio Grande Rise (88–86 Ma), Abrolhos (54–44 Ma), the Vitória–Trindade Chain (no age), Trindade (2.8–1.2 Ma) and Fernando de Noronha (12–1.5 Ma). There are several volcanic features along the NW–SE-trending Cruzeiro do Sul Lineament from Cabo Frio to the Rio Grande Rise, but they have not been dated. The only known occurrence of serpentinized mantle rocks in the South Atlantic margin is associated with the Saint Peter and Saint Paul Rocks located along the São Paulo Fracture Zone. The Cameroon Volcanic Line in NW Africa is related to the magmatism that started in the Late Cretaceous and shows local manifestations up to the Present. The compilation of all available magmatic ages suggests an asymmetrical evolution between the African and South America platforms with more pre-break-up and post-break-up magmatism observed in the Brazilian margin. This is most likely to have resulted from the different geological processes operating during the South Atlantic Ocean opening, shifts in the spreading centre, and, possibly, the rising and waning of mantle plumes. Supplementary material: A complete table with radiometric dates that have been obtained by universities, government agencies and research groups is available at: www.geolsoc.org.uk/SUP18596