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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Afar (24)
-
Blue Nile (3)
-
Central Africa
-
Angola
-
Cabinda Angola (1)
-
-
Burundi (1)
-
Central African Republic (2)
-
Congo (4)
-
Congo Democratic Republic (4)
-
Gabon (3)
-
Lake Kivu (1)
-
Rwanda (1)
-
-
East Africa
-
Afar Depression (39)
-
Djibouti (18)
-
Eritrea (5)
-
Ethiopia
-
Addis Ababa Ethiopia (1)
-
Awash Valley (6)
-
Fantale (2)
-
Hadar (8)
-
Omo Ethiopia (1)
-
Omo River (2)
-
Omo Valley (7)
-
Tigray Ethiopia (3)
-
Wallo Ethiopia (2)
-
-
Ethiopian Rift (28)
-
Kenya
-
East Turkana Basin (1)
-
Kenya Rift valley (3)
-
-
Lake Turkana (6)
-
Malawi (1)
-
Mozambique (4)
-
Somali Republic (4)
-
Sudan (8)
-
Tanzania
-
Laetoli (3)
-
Olduvai Gorge (6)
-
-
Turkana Basin (8)
-
Uganda (4)
-
Zambia (1)
-
-
East African Lakes
-
Lake Kivu (1)
-
Lake Turkana (6)
-
-
East African Rift (23)
-
Gregory Rift (2)
-
Madagascar (2)
-
Mozambique Belt (3)
-
Nile River (2)
-
Nile Valley (1)
-
North Africa
-
Algeria (1)
-
Egypt
-
Eastern Desert (1)
-
Nile Delta (1)
-
-
-
Nubian Shield (8)
-
Red Sea Hills (1)
-
Sahara (1)
-
Southern Africa
-
Lesotho (2)
-
Namibia (1)
-
South Africa (6)
-
Zimbabwe (2)
-
-
Tibesti Massif (1)
-
West Africa
-
Benin (3)
-
Cameroon (3)
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Chad (1)
-
Gambia (1)
-
Ghana (3)
-
Guinea (1)
-
Ivory Coast (3)
-
Liberia (2)
-
Mali (1)
-
Mauritania (2)
-
Niger (1)
-
Nigeria
-
Jos Plateau (1)
-
-
Sierra Leone (1)
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Togo (1)
-
-
-
Arctic region
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Greenland
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East Greenland (1)
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-
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Asal Rift (3)
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Asia
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Arabian Peninsula
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Arabian Shield (4)
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Saudi Arabia (5)
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Yemen (4)
-
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Far East
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China (1)
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Indonesia
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Sumatra (1)
-
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Japan
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Honshu
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Iwate Japan
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Kakkonda Field (1)
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Onikobe Field (1)
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Philippine Islands (1)
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Indian Peninsula
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Bhutan (1)
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India (1)
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Middle East
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Jordan (1)
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Turkey
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East Anatolian Fault (1)
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-
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Russian Pacific region (1)
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Sakhalin Russian Federation
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Kuril Islands (1)
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-
Southeast Asia (1)
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Atlantic Ocean
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North Atlantic
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Reykjanes Ridge (1)
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Atlantic Ocean Islands
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Faeroe Islands (1)
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Australasia
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Australia
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South Australia (1)
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New Zealand
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Wairakei (1)
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Canada
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Western Canada
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British Columbia (1)
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Caribbean region
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West Indies
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Antilles
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Greater Antilles
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Hispaniola
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Dominican Republic (1)
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Haiti (1)
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-
-
-
-
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Central America
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Costa Rica (1)
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Honduras (1)
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Nicaragua (1)
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Cerro Prieto (1)
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Clara Mine (1)
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Commonwealth of Independent States
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Russian Federation
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Murmansk Russian Federation
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Kola Peninsula (1)
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Lovozero Massif (1)
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Russian Pacific region (1)
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Sakhalin Russian Federation
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Kuril Islands (1)
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-
-
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developing countries (1)
-
Europe
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Central Europe
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Black Forest (1)
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Czech Republic
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Moravia (1)
-
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Germany (1)
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Sudeten Mountains
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Izera Mountains (1)
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-
-
Murmansk Russian Federation
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Kola Peninsula (1)
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Lovozero Massif (1)
-
-
Southern Europe
-
Italy
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Sicily Italy
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Mount Etna (1)
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-
Tuscany Italy
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Larderello (1)
-
-
-
-
Western Europe
-
Iceland
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Eyjafjallajokull (1)
-
-
Scandinavia
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Sweden
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Smaland (1)
-
-
-
-
-
Great Rift Valley (6)
-
Indian Ocean
-
Arabian Sea
-
Gulf of Aden
-
Gulf of Tadjoura (2)
-
-
-
Carlsberg Ridge (1)
-
Red Sea
-
Red Sea Rift (3)
-
-
-
Indian Ocean Islands
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Kerguelen Islands (1)
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Madagascar (2)
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Mascarene Islands
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Reunion
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Piton de la Fournaise (1)
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Mauritius (1)
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Mediterranean region (1)
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Mexico
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Baja California (1)
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Puebla Mexico
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Los Humeros (1)
-
-
-
North Island (1)
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Juan de Fuca Ridge (1)
-
-
-
North Pacific
-
Northeast Pacific
-
Juan de Fuca Ridge (1)
-
-
-
-
Pacific region
-
Circum-Pacific region (1)
-
-
Pacific-Antarctic Ridge (1)
-
Red Sea region (5)
-
South America
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Colombia (1)
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Peru (1)
-
-
United States
-
California
-
Humboldt County California (1)
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Salton Sea (1)
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Salton Trough (1)
-
-
New Hampshire (1)
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New Mexico (1)
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New York
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Orange County New York (1)
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-
Oregon (1)
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Texas (1)
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Washington (1)
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Yellowstone National Park (1)
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USSR (1)
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Western Desert (1)
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commodities
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bitumens (1)
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brines (1)
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ceramic materials (1)
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clay deposits (1)
-
construction materials
-
building stone (1)
-
-
energy sources (1)
-
gems (3)
-
geothermal energy (2)
-
industrial minerals (1)
-
metal ores
-
chromite ores (1)
-
copper ores (2)
-
gold ores (3)
-
iron ores (1)
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platinum ores (1)
-
silver ores (1)
-
zinc ores (1)
-
-
mineral deposits, genesis (8)
-
mineral exploration (2)
-
nonmetal deposits (2)
-
petroleum
-
natural gas (2)
-
-
placers (1)
-
potash (3)
-
water resources (4)
-
-
elements, isotopes
-
carbon
-
C-13 (1)
-
C-13/C-12 (10)
-
C-14 (1)
-
-
chemical ratios (1)
-
hydrogen
-
D/H (1)
-
-
incompatible elements (1)
-
isotope ratios (19)
-
isotopes
-
radioactive isotopes
-
C-14 (1)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (2)
-
U-234/Th-230 (1)
-
-
stable isotopes
-
C-13 (1)
-
C-13/C-12 (10)
-
D/H (1)
-
He-3 (1)
-
He-4 (1)
-
He-4/He-3 (1)
-
Hf-177/Hf-176 (1)
-
N-15/N-14 (1)
-
Nd-144/Nd-143 (4)
-
O-18/O-16 (9)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (2)
-
Sr-87/Sr-86 (7)
-
-
-
metals
-
actinides
-
thorium
-
U-234/Th-230 (1)
-
-
uranium
-
U-234/Th-230 (1)
-
-
-
alkali metals
-
lithium (1)
-
rubidium (1)
-
-
alkaline earth metals
-
barium (1)
-
calcium (1)
-
strontium
-
Sr-87/Sr-86 (7)
-
-
-
arsenic (1)
-
copper (1)
-
gold (1)
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
iron (1)
-
lead
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (2)
-
-
manganese (1)
-
platinum group
-
iridium (2)
-
platinum (3)
-
platinum ores (1)
-
rhodium (2)
-
-
rare earths
-
europium (1)
-
neodymium
-
Nd-144/Nd-143 (4)
-
-
-
-
nitrogen
-
N-15/N-14 (1)
-
-
noble gases
-
helium
-
He-3 (1)
-
He-4 (1)
-
He-4/He-3 (1)
-
-
-
oxygen
-
O-18/O-16 (9)
-
-
sulfur (1)
-
trace metals (1)
-
-
fossils
-
bacteria (1)
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Artiodactyla
-
Hippopotamidae (1)
-
Ruminantia (1)
-
Suiformes
-
Suidae (1)
-
-
-
Carnivora
-
Fissipeda
-
Felidae (1)
-
Hyaenidae (1)
-
Mustelidae (1)
-
-
-
Lagomorpha (1)
-
Primates
-
Hominidae
-
Australopithecinae
-
Australopithecus
-
Australopithecus afarensis (3)
-
Australopithecus africanus (1)
-
-
-
Homo
-
Homo erectus (3)
-
Homo habilis (2)
-
Homo sapiens (2)
-
-
-
simians (3)
-
-
Proboscidea
-
Elephantoidea (1)
-
Mastodontoidea (1)
-
-
Rodentia
-
Myomorpha
-
Muridae (1)
-
-
-
-
-
-
Reptilia
-
Anapsida
-
Testudines
-
Chelonia (1)
-
Pleurodira
-
Pelomedusidae (1)
-
-
Testudinidae (1)
-
-
-
Diapsida
-
Archosauria
-
dinosaurs (1)
-
-
-
-
-
-
-
fossil man (5)
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Insecta
-
Pterygota
-
Neoptera
-
Endopterygota
-
Hymenoptera (1)
-
-
Exopterygota
-
Isoptera (1)
-
-
-
-
-
-
-
Cnidaria
-
Anthozoa (1)
-
Hydrozoa (1)
-
-
Mollusca (1)
-
-
microfossils (3)
-
palynomorphs (1)
-
Plantae
-
algae
-
diatoms (1)
-
-
Bryophyta (1)
-
Spermatophyta
-
Angiospermae
-
Dicotyledoneae (1)
-
-
Gymnospermae
-
Coniferales (1)
-
Cordaitales (1)
-
-
-
-
thallophytes (1)
-
-
geochronology methods
-
(U-Th)/He (1)
-
Ar/Ar (15)
-
fission-track dating (1)
-
K/Ar (8)
-
paleomagnetism (6)
-
Rb/Sr (3)
-
Re/Os (1)
-
Sm/Nd (1)
-
tephrochronology (5)
-
Th/U (1)
-
thermochronology (2)
-
tree rings (1)
-
U/Pb (9)
-
-
geologic age
-
Cenozoic
-
Koobi Fora Formation (5)
-
Omo Group (6)
-
Quaternary
-
Holocene
-
Mesolithic (3)
-
middle Holocene (1)
-
Neolithic (1)
-
upper Holocene (1)
-
-
Pleistocene
-
lower Pleistocene (2)
-
middle Pleistocene (1)
-
upper Pleistocene (2)
-
-
-
Shungura Formation (8)
-
Stone Age
-
Mesolithic (3)
-
Neolithic (1)
-
Paleolithic
-
Acheulian (1)
-
-
-
Tertiary
-
John Day Formation (1)
-
Neogene
-
Gilbert Chron (1)
-
Miocene
-
lower Miocene (2)
-
upper Miocene (4)
-
Wanapum Basalt (1)
-
-
Pliocene
-
Hadar Formation (12)
-
lower Pliocene (5)
-
upper Pliocene (4)
-
-
-
Paleogene
-
Eocene
-
Clarno Formation (1)
-
upper Eocene (1)
-
-
Oligocene
-
upper Oligocene (2)
-
-
-
-
upper Cenozoic
-
Villafranchian (1)
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous (1)
-
-
Jurassic
-
Lower Jurassic
-
Toarcian (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
-
Upper Jurassic (1)
-
-
Triassic (3)
-
-
Paleozoic
-
Carboniferous (1)
-
Ordovician (2)
-
Permian (3)
-
Silurian (1)
-
upper Paleozoic (1)
-
-
Phanerozoic (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Stenian (1)
-
-
Neoproterozoic
-
Cryogenian (2)
-
Riphean (1)
-
Sturtian (2)
-
Tonian (3)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
carbonatites (1)
-
feldspathoid rocks (1)
-
kimberlite (1)
-
plutonic rocks
-
granites
-
alkali granites (1)
-
charnockite (1)
-
-
ijolite (1)
-
pegmatite (1)
-
syenites
-
nepheline syenite
-
agpaite (1)
-
-
-
ultramafics
-
chromitite (1)
-
peridotites
-
harzburgite (3)
-
lherzolite (2)
-
spinel lherzolite (1)
-
-
pyroxenite
-
clinopyroxenite (1)
-
websterite (1)
-
-
-
-
volcanic rocks
-
andesites (1)
-
basalts
-
alkali basalts (4)
-
flood basalts (11)
-
mid-ocean ridge basalts (3)
-
tholeiite (1)
-
trap rocks (2)
-
-
glasses
-
volcanic glass (1)
-
-
leucitite (1)
-
phonolites (1)
-
pyroclastics
-
ignimbrite (8)
-
pumice (4)
-
tuff (13)
-
tuffite (1)
-
-
rhyolites
-
pantellerite (3)
-
-
trachyandesites (1)
-
trachytes (4)
-
-
-
ophiolite (3)
-
volcanic ash (3)
-
-
metamorphic rocks
-
metamorphic rocks
-
granulites (1)
-
metasedimentary rocks (1)
-
metavolcanic rocks (1)
-
mylonites (1)
-
schists
-
greenschist (1)
-
-
-
ophiolite (3)
-
-
minerals
-
alloys (1)
-
arsenites
-
mixite (1)
-
-
carbonates
-
aragonite (1)
-
-
halides
-
fluorides (1)
-
-
minerals (3)
-
organic minerals
-
amber (2)
-
-
oxides
-
hydroxides (1)
-
ilmenite (1)
-
iron oxides (1)
-
titanomagnetite (1)
-
-
phosphates
-
apatite (1)
-
hydroxylapatite (1)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
pargasite (1)
-
-
-
pyroxene group
-
clinopyroxene (1)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
anorthoclase (1)
-
-
-
silica minerals
-
opal (2)
-
-
zeolite group
-
clinoptilolite (1)
-
-
-
orthosilicates
-
nesosilicates
-
olivine group
-
olivine (2)
-
-
zircon group
-
zircon (6)
-
-
-
sorosilicates
-
epidote group
-
epidote (1)
-
-
ilvaite (1)
-
-
-
ring silicates
-
emerald (1)
-
-
sheet silicates
-
clay minerals
-
kaolinite (2)
-
smectite (2)
-
-
illite (1)
-
-
-
sulfates
-
gypsum (2)
-
-
sulfides
-
bohdanowiczite (1)
-
-
tellurides (1)
-
-
Primary terms
-
absolute age (37)
-
Africa
-
Afar (24)
-
Blue Nile (3)
-
Central Africa
-
Angola
-
Cabinda Angola (1)
-
-
Burundi (1)
-
Central African Republic (2)
-
Congo (4)
-
Congo Democratic Republic (4)
-
Gabon (3)
-
Lake Kivu (1)
-
Rwanda (1)
-
-
East Africa
-
Afar Depression (39)
-
Djibouti (18)
-
Eritrea (5)
-
Ethiopia
-
Addis Ababa Ethiopia (1)
-
Awash Valley (6)
-
Fantale (2)
-
Hadar (8)
-
Omo Ethiopia (1)
-
Omo River (2)
-
Omo Valley (7)
-
Tigray Ethiopia (3)
-
Wallo Ethiopia (2)
-
-
Ethiopian Rift (28)
-
Kenya
-
East Turkana Basin (1)
-
Kenya Rift valley (3)
-
-
Lake Turkana (6)
-
Malawi (1)
-
Mozambique (4)
-
Somali Republic (4)
-
Sudan (8)
-
Tanzania
-
Laetoli (3)
-
Olduvai Gorge (6)
-
-
Turkana Basin (8)
-
Uganda (4)
-
Zambia (1)
-
-
East African Lakes
-
Lake Kivu (1)
-
Lake Turkana (6)
-
-
East African Rift (23)
-
Gregory Rift (2)
-
Madagascar (2)
-
Mozambique Belt (3)
-
Nile River (2)
-
Nile Valley (1)
-
North Africa
-
Algeria (1)
-
Egypt
-
Eastern Desert (1)
-
Nile Delta (1)
-
-
-
Nubian Shield (8)
-
Red Sea Hills (1)
-
Sahara (1)
-
Southern Africa
-
Lesotho (2)
-
Namibia (1)
-
South Africa (6)
-
Zimbabwe (2)
-
-
Tibesti Massif (1)
-
West Africa
-
Benin (3)
-
Cameroon (3)
-
Chad (1)
-
Gambia (1)
-
Ghana (3)
-
Guinea (1)
-
Ivory Coast (3)
-
Liberia (2)
-
Mali (1)
-
Mauritania (2)
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Ethiopia
Causes and Mechanisms of Road Damage in Rift Valley Escarpments: The Case of Agoro-Shahigubi Road, Ethiopia Available to Purchase
Natural Wonders Formed by Minerals Available to Purchase
Throw distribution across the Dabbahu–Manda Hararo dike-induced fault array: Implications for rifting and faulting Available to Purchase
Evaluating reservoir properties and seal capacities of volcaniclastic rocks for hydrocarbon containment and their application to CO 2 storage Available to Purchase
Abstract Volcaniclastic rocks are commonly overlooked as reservoirs or seals in hydrocarbon plays because their compositions are variably unstable and reactive during burial diagenesis. This study investigated the petrography and petrophysical characteristics of 60 volcaniclastic and four siliciclastic samples from three Paleogene volcanic provinces – East Greenland, Faroe Islands and Ethiopia. The volcaniclastic samples have highly variable helium porosities (average 25.2%), but negligible total optical porosities (average 1.9%), implying reduced reservoir potential. The samples have, however, highly variable air permeabilities (average 11 mD), suggesting that they could make tight reservoirs. The permeabilities are related to either early calcite cements or the devitrification of volcanic glass. Mercury injection capillary pressure data were collected for a subset of 33 samples that at leakage/breakthrough saturations could, under near-surface conditions, hold oil column heights of between 4 and 1181 m (average 240 m). The best seals consistently have zeolite contents of >20 vol% owing to their small pore throat radii. Conversely, the worst seals are dominated by smectite and a conspicuous absence of zeolite minerals. The zeolite-rich volcaniclastic rocks could, therefore, make good shallow seals. These features also apply to CO 2 storage, but questions remain about the reactivity of the volcanic material and secondary minerals with injected CO 2 , but also the adsorbent properties of zeolites, particularly clinoptilolite, in the presence of CO 2 .
GORDON LYALL PAVER (1913–1988) AND 42ND GEOLOGICAL SECTION, SOUTH AFRICAN ENGINEER CORPS: MILITARY GEOLOGY AND GEOPHYSICS IN WORLD WAR II SUPPORTING BRITISH ARMY OPERATIONS: PART 1, THE EAST AFRICAN CAMPAIGN 1940–1941 Available to Purchase
Possible Role of Internal Erosion in the Development of Ground Fissures around Lake Ziway, Ethiopia Open Access
Geophysically guided well siting at the Aluto-Langano geothermal reservoir Open Access
40 Ar/ 39 Ar eruption ages of Turkana Basin tuffs: millennial-scale resolution constrains palaeoclimate proxy tuning models and hominin fossil ages Open Access
Controls on sediment distribution in a volcanically-affected basin: insights from the Ethiopian Flood Basalt Province Available to Purchase
Abstract This study provides a comprehensive examination of the Oligocene–Miocene Ethiopian Flood Basalt Province (EFBP) within the Blue Nile (Abay) Basin (BNB), Ethiopia. Extensive logging through 29 new sections has enabled an updated stratigraphic account of the BNB to be elucidated and reveals the significance of intravolcanic sedimentary systems within the EFBP. Five sub- and intra-volcanic surfaces were modelled using spot heights to generate isopach maps that were used to constrain the thickness variations within the stratigraphy. Additionally, lineaments, Strahler stream segments and volcanic cones were mapped out from digital elevation models (SRTM DEM) and satellite data (ASTER and LANDSAT 8 imagery). These data were used in conjunction with the isopach maps to better understand the basinal controls on the distribution of intravolcanic sedimentary systems within the BNB. The study reveals how NNE and ESE/SE structural trends have influenced the distribution of volcanoes within the basin, which has in turn disrupted the distribution and lithofacies architecture of the volcanic sequences. The presence of intrabasinal ridges parallel to the major structural trends are also revealed, which formed relatively short-lived drainage divides. The implications of these intrabasinal highs on the composition and the reservoir potential of intravolcanic sedimentary successions are discussed.
Volcaniclastic sedimentation in a closed, marginal rift basin: the case of the Melka Kunture area (upper Awash, Ethiopia) Available to Purchase
Abstract The upper Awash runs across a volcano-sedimentary succession dated from the Early to Middle Pleistocene and located on the western margin of the northern portion of the Main Ethiopian Rift. The succession lies above Late Miocene to Pliocene lava flows, domes and large volume ignimbrites. The succession formed within a fluvial system that developed within transversal rift faults. The stratigraphy consists of primary volcanic deposits interbedded with reworked sediments emplaced in a low-energy floodplain developed in a subsiding area. The lower part of the volcaniclastic sequence is dominated by a 1.2 Ma old, low aspect ratio, pyroclastic density current deposit (Kella ignimbrite). This eruption was followed by an eruptive stasis and reorganization of the drainage system. Tephra deposition in the floodplain climaxed again between 0.9 and 0.7 Ma and was associated with extensive tephra reworking. Sedimentation rates significantly decreased after 0.6 myr ago, probably owing to declining volcanic activity. Dynamic interaction between tectonics and volcanic activity created a complex sedimentary environment preserving numerous artefacts (lithic tools), animal and hominin remains. Stratigraphic correlation is based on the interpretation of the basin evolution and has relevance for the reconstruction of the palaeoenvironment and the interpretation of the palaeontological and archaeological data.
Paleolakes of Eastern Africa: Zeolites, Clay Minerals, and Climate Available to Purchase
The Dawn of Humanity: What Can Paleoanthropologists and Geoscientists Learn from One Another? Available to Purchase
Using Radiometric Dating, Magnetostratigraphy, and Tephrostratigraphy to Calibrate Rates of Hominin Evolution in the East African Rift Available to Purchase
Potential Uses of Local Clay Materials for the Production of Porcelain Electrical Insulators, Ethiopia Available to Purchase
Formation of magmatic segments within the Aluto-Gedemsa area, Main Ethiopian Rift Available to Purchase
Time-space variations in the East African Rift magmatism: the role of different mantle domains Available to Purchase
Transverse tectonics control on the Late Quaternary development of the Central Main Ethiopian Rift Available to Purchase
Quaternary off-rift volcanism along a section of the East African Rift System (EARS), from the south Ethiopia to the south Kenya Available to Purchase
Dinosaurs could not help it, can we? Big history and planetary health Available to Purchase
ABSTRACT One of the most recent intellectual enterprises of the scientist honored in this book, Walter Alvarez, is the dive into big history. Alvarez’s research and worldview contributed directly to the foundations of this transdisciplinary field. In this paper, the relevance of big history to the emergent idea of planetary health is demonstrated. Since big history studies both natural and human-made systems over long periods of time, it is uniquely positioned to help address the three categories of challenges identified within planetary health: imagination, knowledge, and governance. Most extensively, this paper focuses on governance challenges. A case study on the Ethiopian health system illustrates that governance frameworks can be reimagined in such a way that incentives and efforts of actors within the system are aligned, producing better human health outcomes. For Homo sapiens to have a better chance of survival than dinosaurs did 66 million years ago, these lessons will need to be applied more broadly in the planetary health domain.