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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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Adrar des Iforas (2)
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Central Africa
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Angola
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Cabinda Angola (2)
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Central African Republic (2)
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Congo (2)
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Equatorial Guinea (2)
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Gabon
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Oklo (1)
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Chad Basin (1)
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East Africa
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Ethiopia (1)
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Sudan
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Darfur (1)
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North Africa
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Algeria
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Ahaggar (38)
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Aleksod (1)
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Gour Oumelalen (2)
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Atlas Mountains
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Anti-Atlas (3)
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High Atlas (1)
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Egypt (1)
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Libya (2)
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Morocco
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Southern Africa
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Lesotho (1)
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Namibia (3)
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South Africa
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Witwatersrand (1)
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Tibesti Massif (1)
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West Africa
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Ghana (2)
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Mali (11)
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Coniferales (1)
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Tertiary
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Paleocene
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Mesozoic
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sulfides
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-
-
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Primary terms
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absolute age (23)
-
Africa
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Adrar des Iforas (2)
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Central Africa
-
Angola
-
Cabinda Angola (2)
-
-
Central African Republic (2)
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Congo (2)
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Congo Democratic Republic (1)
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Equatorial Guinea (2)
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Gabon
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Oklo (1)
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-
-
Chad Basin (1)
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Congo Basin (1)
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East Africa
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Ethiopia (1)
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Sudan
-
Darfur (1)
-
-
-
North Africa
-
Algeria
-
Ahaggar (38)
-
Aleksod (1)
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Gour Oumelalen (2)
-
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (3)
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High Atlas (1)
-
-
-
Egypt (1)
-
Libya (2)
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (3)
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High Atlas (1)
-
-
-
Tunisia (2)
-
-
Red Sea Hills (1)
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Reguibat Ridge (1)
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Sahara (10)
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Sahel (6)
-
Southern Africa
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Lesotho (1)
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Namibia (3)
-
South Africa
-
Witwatersrand (1)
-
-
-
Tibesti Massif (1)
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Volta Basin (1)
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West Africa
-
Benin (3)
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Burkina Faso (4)
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Cameroon (4)
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Chad (5)
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Ghana (2)
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Guinea (2)
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Ivory Coast (3)
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Liberia (2)
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Mali (11)
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Mauritania
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Nouakchott Mauritania (1)
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Mauritanides (1)
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Niger (50)
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Nigeria
-
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Senegal (2)
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Sierra Leone (1)
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Taoudenni Basin (1)
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Togo (1)
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West African Craton (3)
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Asia
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Far East
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Sumatra (1)
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Indian Peninsula
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Pakistan (1)
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Middle East
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Cyprus (1)
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Syria (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico
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Florida Escarpment (1)
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North Sea (3)
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South Atlantic
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Brazil Basin (1)
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Southeast Atlantic (2)
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Atlantic region (4)
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atmosphere (1)
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biogeography (4)
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carbon
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Caribbean region (1)
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Cenozoic
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Quaternary
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Holocene
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upper Pleistocene
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upper Weichselian
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Younger Dryas (1)
-
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-
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Tertiary
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Neogene
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Miocene
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lower Miocene
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Aquitanian (1)
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Oil families, oil–source rock correlation, basin modeling, and implication for petroleum systems, Termit Basin, Niger
Seismometer Orientation Correction via Teleseismic Receiver Function Measurements in West Africa and Adjacent Islands
ABSTRACT The Avalon terrane of southeastern New England is a composite terrane in which various crustal blocks may have different origins and/or tectonic histories. The northern part (west and north of Boston, Massachusetts) correlates well with Avalonian terranes in Newfoundland, Nova Scotia, and New Brunswick, Canada, based on rock types and ages, U-Pb detrital zircon signatures of metasedimentary rocks, and Sm-Nd isotope geochemistry data. In the south, fewer data exist, in part because of poorer rock exposure, and the origins and histories of the rocks are less well constrained. We conducted U-Pb laser ablation–inductively coupled plasma–mass spectrometry analysis on zircon from seven metasedimentary rock samples from multiple previously interpreted subterranes in order to constrain their origins. Two samples of Neoproterozoic Plainfield Formation quartzite from the previously interpreted Hope Valley subterrane in the southwestern part of the southeastern New England Avalon terrane and two from the Neoproterozoic Blackstone Group quartzite from the adjacent Esmond-Dedham subterrane to the east have Tonian youngest detrital zircon age populations. One sample of Cambrian North Attleboro Formation quartzite of the Esmond-Dedham subterrane yielded an Ediacaran youngest detrital zircon age population. Detrital zircon populations of all five samples include abundant Mesoproterozoic zircon and smaller Paleoproterozoic and Archean populations, and are similar to those of the northern part of the southeastern New England Avalon terrane and the Avalonian terranes in Canada. These are interpreted as having a Baltican/Amazonian affinity based primarily on published U-Pb and Lu-Hf detrital zircon data. Based on U-Pb detrital zircon data, there is no significant difference between the Hope Valley and Esmond-Dedham subterranes. Detrital zircon of two samples of the Price Neck and Newport Neck formations of the Neoproterozoic Newport Group in southern Rhode Island is characterized by large ca. 647–643 and ca. 745–733 Ma age populations and minor zircon up to ca. 3.1 Ga. This signature is most consistent with a northwest African affinity. The Newport Group may thus represent a subterrane, terrane, or other crustal block with a different origin and history than the southeastern New England Avalon terrane to the northwest. The boundary of this Newport Block may be restricted to the boundaries of the Newport Group, or it may extend as far north as Weymouth, Massachusetts, as far northwest as (but not including) the North Attleboro Formation quartzite and associated rocks in North Attleboro, Massachusetts, and as far west as Warwick, Rhode Island, where eastern exposures of the Blackstone Group quartzite exist. The Newport Block may have amalgamated with the Amazonian/Baltican part of the Avalon terrane prior to mid-Paleozoic amalgamation with Laurentia, or it may have arrived as a separate terrane after accretion of the Avalon terrane. Alternatively, it may have arrived during the formation of Pangea and been stranded after the breakup of Pangea, as has been proposed previously for rocks of the Georges Bank in offshore Massachusetts. If the latter is correct, then the boundary between the Newport Block and the southeastern New England Avalon terrane is the Pangean suture zone.
Gravimetry and petrophysics for defining the intracratonic and rift basins of the Western-Central Africa zone
Partial melting and P-T evolution of eclogite-facies metapelitic migmatites from the Egere terrane (Central Hoggar, South Algeria)
Discussion on ‘From Pan-African transpression to Cadomian transtension at the West African margin: new U–Pb zircon ages from the Eastern Saghro Inlier (Anti-Atlas, Morocco)’ by Errami et al . 2020 ( SP 503, 209–233)
Reply to discussion on ‘From Pan-African transpression to Cadomian transtension at the West African margin: new U–Pb zircon ages from the Eastern Saghro Inlier (Anti-Atlas, Morocco)’ by Errami et al . ( SP 503, 209–233)
Anisotropic 3D elastic full-wavefield inversion to directly estimate elastic properties and its role in interpretation
The Central Sudetic Ophiolite (European Variscan Belt): precise U–Pb zircon dating and geotectonic implications
A review of amber and copal occurrences in Africa and their paleontological significance
Lessons learned from the monitoring of turbidity currents and guidance for future platform designs
Abstract Turbidity currents transport globally significant volumes of sediment and organic carbon into the deep-sea and pose a hazard to critical infrastructure. Despite advances in technology, their powerful nature often damages expensive instruments placed in their path. These challenges mean that turbidity currents have only been measured in a few locations worldwide, in relatively shallow water depths (<<2 km). Here, we share lessons from recent field deployments about how to design the platforms on which instruments are deployed. First, we show how monitoring platforms have been affected by turbidity currents including instability, displacement, tumbling and damage. Second, we relate these issues to specifics of the platform design, such as exposure of large surface area instruments within a flow and inadequate anchoring or seafloor support. Third, we provide recommended modifications to improve design by simplifying mooring configurations, minimizing surface area and enhancing seafloor stability. Finally, we highlight novel multi-point moorings that avoid interaction between the instruments and the flow, and flow-resilient seafloor platforms with innovative engineering design features, such as feet and ballast that can be ejected. Our experience will provide guidance for future deployments, so that more detailed insights can be provided into turbidity current behaviour, in a wider range of settings.
A time-lapse case study in West Africa: Integrating disciplines for a complete reservoir study and field management
Abstract Paleoproterozoic terranes of the Man-Leo Shield in the southern part of the West African craton host one of the world’s largest gold provinces with an overall endowment >10,000 metric tons (t). Although gold deposition commenced by ca. 2170 Ma, most deposits formed later, either during the inversion and metamorphism of intraorogenic sedimentary basins between ca. 2110 and 2095 Ma, or during later transcurrent deformation and associated widespread high K plutonism following docking of Archean and Paleoproterozoic domains within the craton at ca. 2095 Ma. Deposits formed between ca. 2110 and 2095 Ma include those with free gold in quartz veins and refractory gold in arsenopyrite and/or pyrite, and are associated with halos of carbonate, sericite, chlorite, and albite alteration. Most are located in bends and intersections between shear zones, minor faults, folds, and entrained blocks of relatively reactive igneous rock. Conglomerate-hosted gold deposits of the Tarkwa district formed early in the 15-m.y.-long period. Gold deposits that formed subsequently between ca. 2095 and 2060 Ma have a wider variety of styles, geologic settings, and metal assemblages. District-scale albite, carbonate, and tourmaline alteration, hydrothermal breccias, and a close relationship to high K granitoids characterize some of these deposits, whereas others are more typical orogenic gold deposits that are similar to those formed earlier during the craton evolution.