Update search
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
-
Angola (1)
-
-
Congo Craton (1)
-
East Africa
-
Mozambique (1)
-
-
Southern Africa
-
Kaapvaal Craton (1)
-
Namibia (1)
-
South Africa
-
Cape fold belt (1)
-
KwaZulu-Natal South Africa (1)
-
-
-
-
Antarctica
-
Antarctic ice sheet
-
East Antarctic ice sheet (1)
-
-
East Antarctica (6)
-
Ellsworth Land
-
Ellsworth Mountains (3)
-
-
Marie Byrd Land (1)
-
Queen Maud Land
-
Schirmacher Hills (1)
-
-
Ross Ice Shelf (1)
-
Transantarctic Mountains
-
Beardmore Glacier (1)
-
Pensacola Mountains (5)
-
Queen Maud Range (3)
-
-
Victoria Land
-
McMurdo dry valleys (2)
-
Wilson Terrane (2)
-
-
West Antarctica (1)
-
Wilkes Land (1)
-
-
Asia
-
Himalayas (1)
-
-
Atlantic Ocean Islands
-
Falkland Islands (1)
-
-
Australasia
-
Australia
-
Adelaide Geosyncline (2)
-
Lachlan fold belt (3)
-
South Australia
-
Fleurieu Peninsula (1)
-
Flinders Ranges (1)
-
-
Tasmania Australia (3)
-
Victoria Australia (2)
-
-
New Zealand
-
Southland New Zealand
-
Fiordland National Park (1)
-
-
-
-
Forth Valley (1)
-
North America
-
Canadian Shield
-
Grenville Province (1)
-
-
-
Pacific Ocean (1)
-
Pacific region (4)
-
Shackleton Glacier (1)
-
South America
-
Argentina
-
Pampean Mountains (1)
-
-
Brazil
-
Sao Francisco Craton (1)
-
-
Falkland Islands (1)
-
-
South Island (1)
-
Southern Ocean
-
Ross Sea (1)
-
-
Taylor Valley (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (1)
-
-
isotope ratios (6)
-
isotopes
-
radioactive isotopes
-
Rb-87/Sr-86 (1)
-
-
stable isotopes
-
C-13/C-12 (1)
-
Hf-177/Hf-176 (2)
-
Nd-144/Nd-143 (1)
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
metals
-
alkali metals
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
-
alkaline earth metals
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
hafnium
-
Hf-177/Hf-176 (2)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
-
fossils
-
Chordata
-
Vertebrata (1)
-
-
ichnofossils (2)
-
Invertebrata
-
Archaeocyatha (2)
-
Arthropoda
-
Trilobitomorpha
-
Trilobita (2)
-
-
-
Brachiopoda (2)
-
-
microfossils
-
Conodonta (1)
-
-
-
geochronology methods
-
Ar/Ar (7)
-
Pb/Pb (1)
-
Rb/Sr (4)
-
Sm/Nd (2)
-
U/Pb (18)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Pleistocene (1)
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Oligocene (1)
-
-
-
-
Mesozoic (1)
-
Paleozoic
-
Cambrian
-
Kanmantoo Group (3)
-
Lower Cambrian (1)
-
Middle Cambrian (1)
-
Upper Cambrian (2)
-
-
Devonian (2)
-
lower Paleozoic (17)
-
Ordovician
-
Lower Ordovician (1)
-
-
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (2)
-
Neoproterozoic
-
Burra Group (1)
-
Wilpena Group (1)
-
-
Paleoproterozoic (1)
-
Umberatana Group (1)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
diorites
-
tonalite (1)
-
-
gabbros (1)
-
granites
-
monzogranite (1)
-
-
granodiorites (2)
-
lamprophyres (2)
-
pegmatite (1)
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (1)
-
-
dacites (1)
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
gneisses
-
granite gneiss (1)
-
orthogneiss (2)
-
-
granulites (1)
-
metaigneous rocks
-
metabasalt (1)
-
metagranite (1)
-
metatuff (1)
-
-
metasedimentary rocks
-
metaconglomerate (1)
-
metagraywacke (1)
-
-
metavolcanic rocks (1)
-
mylonites (2)
-
quartzites (1)
-
schists (1)
-
-
-
minerals
-
carbonates
-
calcite (1)
-
-
phosphates
-
monazite (2)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (1)
-
-
-
pyroxene group
-
orthopyroxene (1)
-
-
-
framework silicates
-
feldspar group (1)
-
-
orthosilicates
-
nesosilicates
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (15)
-
-
-
-
sheet silicates
-
mica group
-
biotite (2)
-
muscovite (2)
-
phlogopite (1)
-
-
-
-
-
Primary terms
-
absolute age (26)
-
Africa
-
Central Africa
-
Angola (1)
-
-
Congo Craton (1)
-
East Africa
-
Mozambique (1)
-
-
Southern Africa
-
Kaapvaal Craton (1)
-
Namibia (1)
-
South Africa
-
Cape fold belt (1)
-
KwaZulu-Natal South Africa (1)
-
-
-
-
Antarctica
-
Antarctic ice sheet
-
East Antarctic ice sheet (1)
-
-
East Antarctica (6)
-
Ellsworth Land
-
Ellsworth Mountains (3)
-
-
Marie Byrd Land (1)
-
Queen Maud Land
-
Schirmacher Hills (1)
-
-
Ross Ice Shelf (1)
-
Transantarctic Mountains
-
Beardmore Glacier (1)
-
Pensacola Mountains (5)
-
Queen Maud Range (3)
-
-
Victoria Land
-
McMurdo dry valleys (2)
-
Wilson Terrane (2)
-
-
West Antarctica (1)
-
Wilkes Land (1)
-
-
Asia
-
Himalayas (1)
-
-
Atlantic Ocean Islands
-
Falkland Islands (1)
-
-
Australasia
-
Australia
-
Adelaide Geosyncline (2)
-
Lachlan fold belt (3)
-
South Australia
-
Fleurieu Peninsula (1)
-
Flinders Ranges (1)
-
-
Tasmania Australia (3)
-
Victoria Australia (2)
-
-
New Zealand
-
Southland New Zealand
-
Fiordland National Park (1)
-
-
-
-
carbon
-
C-13/C-12 (1)
-
-
Cenozoic
-
Quaternary
-
Pleistocene (1)
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Oligocene (1)
-
-
-
-
Chordata
-
Vertebrata (1)
-
-
continental drift (7)
-
crust (8)
-
crystal chemistry (1)
-
crystal growth (1)
-
Deep Sea Drilling Project
-
Leg 28 (1)
-
-
deformation (8)
-
faults (7)
-
folds (3)
-
foliation (3)
-
geochemistry (6)
-
geochronology (2)
-
glacial geology (1)
-
ichnofossils (2)
-
igneous rocks
-
plutonic rocks
-
diorites
-
tonalite (1)
-
-
gabbros (1)
-
granites
-
monzogranite (1)
-
-
granodiorites (2)
-
lamprophyres (2)
-
pegmatite (1)
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (1)
-
-
dacites (1)
-
-
-
intrusions (7)
-
Invertebrata
-
Archaeocyatha (2)
-
Arthropoda
-
Trilobitomorpha
-
Trilobita (2)
-
-
-
Brachiopoda (2)
-
-
isotopes
-
radioactive isotopes
-
Rb-87/Sr-86 (1)
-
-
stable isotopes
-
C-13/C-12 (1)
-
Hf-177/Hf-176 (2)
-
Nd-144/Nd-143 (1)
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
lava (1)
-
magmas (6)
-
mantle (2)
-
Mesozoic (1)
-
metals
-
alkali metals
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
-
alkaline earth metals
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
hafnium
-
Hf-177/Hf-176 (2)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
metamorphic rocks
-
gneisses
-
granite gneiss (1)
-
orthogneiss (2)
-
-
granulites (1)
-
metaigneous rocks
-
metabasalt (1)
-
metagranite (1)
-
metatuff (1)
-
-
metasedimentary rocks
-
metaconglomerate (1)
-
metagraywacke (1)
-
-
metavolcanic rocks (1)
-
mylonites (2)
-
quartzites (1)
-
schists (1)
-
-
metamorphism (5)
-
North America
-
Canadian Shield
-
Grenville Province (1)
-
-
-
orogeny (23)
-
Pacific Ocean (1)
-
Pacific region (4)
-
paleogeography (5)
-
Paleozoic
-
Cambrian
-
Kanmantoo Group (3)
-
Lower Cambrian (1)
-
Middle Cambrian (1)
-
Upper Cambrian (2)
-
-
Devonian (2)
-
lower Paleozoic (17)
-
Ordovician
-
Lower Ordovician (1)
-
-
-
paragenesis (1)
-
plate tectonics (12)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (2)
-
Neoproterozoic
-
Burra Group (1)
-
Wilpena Group (1)
-
-
Paleoproterozoic (1)
-
Umberatana Group (1)
-
-
-
-
sedimentary rocks
-
carbonate rocks
-
limestone (4)
-
-
clastic rocks
-
arenite
-
quartz arenite (1)
-
-
conglomerate (2)
-
sandstone (1)
-
shale (1)
-
tillite (1)
-
-
-
sedimentary structures
-
biogenic structures
-
bioherms (1)
-
-
planar bedding structures
-
cross-bedding (1)
-
hummocky cross-stratification (1)
-
laminations (1)
-
-
soft sediment deformation
-
clastic dikes (1)
-
-
-
sedimentation (4)
-
sediments
-
clastic sediments
-
diamicton (2)
-
till (2)
-
-
-
South America
-
Argentina
-
Pampean Mountains (1)
-
-
Brazil
-
Sao Francisco Craton (1)
-
-
Falkland Islands (1)
-
-
Southern Ocean
-
Ross Sea (1)
-
-
structural analysis (5)
-
structural geology (1)
-
tectonics (17)
-
-
rock formations
-
Taylor Group (1)
-
-
sedimentary rocks
-
flysch (1)
-
sedimentary rocks
-
carbonate rocks
-
limestone (4)
-
-
clastic rocks
-
arenite
-
quartz arenite (1)
-
-
conglomerate (2)
-
sandstone (1)
-
shale (1)
-
tillite (1)
-
-
-
siliciclastics (1)
-
-
sedimentary structures
-
sedimentary structures
-
biogenic structures
-
bioherms (1)
-
-
planar bedding structures
-
cross-bedding (1)
-
hummocky cross-stratification (1)
-
laminations (1)
-
-
soft sediment deformation
-
clastic dikes (1)
-
-
-
-
sediments
-
sediments
-
clastic sediments
-
diamicton (2)
-
till (2)
-
-
-
siliciclastics (1)
-
GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Ross Orogeny
The amalgamation of Gondwana: calcite twinning and finite strains from the early–late Paleozoic Buzios, Ross, Kurgiakh and Gondwanide orogens Available to Purchase
Abstract Orientated carbonate (calcite twinning strains; n = 78 with 2414 twin measurements) and quartzites (finite strains; n = 15) were collected around Gondwana to study the deformational history associated with the amalgamation of the supercontinent. The Buzios orogen (545–500 Ma), within interior Gondwana, records the high-grade collisional orogen between the São Francisco Craton (Brazil) and the Congo–Angola Craton (Angola and Namibia), and twinning strains in calc-silicates record a SE–NW shortening fabric parallel to the thrust transport. Along Gondwana's southern margin, the Saldanian–Ross–Delamerian orogen (590–480 Ma) is marked by a regional unconformity that cuts into deformed Neoproterozoic–Ordovician sedimentary rocks and associated intrusions. Cambrian carbonate is preserved in the central part of the southern Gondwana margin, namely in the Kango Inlier of the Cape Fold Belt and the Ellsworth, Pensacola and Transantarctic mountains. Paleozoic carbonate is not preserved in the Ventana Mountains in Argentina, in the Falkland Islands/Islas Malvinas or in Tasmania. Twinning strains in these Cambrian carbonate strata and synorogenic veins record a complex, overprinted deformation history with no stable foreland strain reference. The Kurgiakh orogen (490 Ma) along Gondwana's northern margin is also defined by a regional Ordovician unconformity throughout the Himalaya; these rocks record a mix of layer-parallel and layer-normal twinning strains with a likely Himalayan (40 Ma) strain overprint and no autochthonous foreland strain site. Conversely, the Gondwanide orogen (250 Ma) along Gondwana's southern margin has three foreland (autochthonous) sites for comparison with 59 allochthonous thrust-belt strain analyses. From west to east, these include: finite strains from Devonian quartzite preserve a layer-parallel shortening (LPS) strain rotated clockwise in the Ventana Mountains of Argentina; frontal (calcite twins) and internal (quartzite strains) samples in the Cape Fold Belt preserve a LPS fabric that is rotated clockwise from the autochthonous north–south horizontal shortening in the foreland strain site; Falkland Devonian quartzite shows the same clockwise rotation of the LPS fabric; and Permian limestone and veins in Tasmania record a thrust transport-parallel LPS fabric. Early amalgamation of Gondwana (Ordovician) is preserved by local layer-parallel and layer-normal strain without evidence of far-field deformation, whereas the Gondwanide orogen (Permian) is dominated by layer-parallel shortening, locally rotated by dextral shear along the margin, that propagated across the supercontinent.
Current knowledge of the Ordovician System in Antarctica Available to Purchase
Abstract Evidence of Early Ordovician deposition and intrusion in East Antarctica is best known from the Ross Orogen, postdating the 495–489 Ma Ross Orogeny. Here, c. 490–475 Ma granites (with related dykes and sills) of the Granite Harbour Intrusives represent roots of a continental margin arc. Detrital zircon grains in the upper Byrd Group (Central Transantarctic Mountains) are of comparable Early Ordovician age. Contemporaneous fossils are rare. In northern Victoria Land they include latest Cambrian to earliest Ordovician conodonts and microbrachiopods in allochthonous limestones of the Handler Formation (Robertson Bay Group) in the Robertson Bay Terrane, and probable Early Ordovician trace fossils in the Camp Ridge Quartzite of the Leap Year Group in the Bowers Terrane. In the Shackleton Range of Coats Land, West Antarctica, the Blaiklock Glacier Group contains a diverse ichnofossil fauna of probable Ordovician age associated with undescribed bivalved arthropods and segmented crustacea. The Swanson Formation of the Ross Province in Marie Byrd Land (correlated with the Robertson Bay Group of the Ross Orogen) is a turbiditic unit dominated by quartz-rich sandstones. Its Ordovician age is based on a post-depositional whole rock K–Ar metamorphic age of 448–444 Ma, with detrital zircon grains indicating a late Cambrian maximum depositional age.
Correlation and Late-Stage Deformation of Liv Group Volcanics in the Ross-Delamerian Orogen, Antarctica, from New U-Pb Ages Available to Purchase
Mixing between enriched lithospheric mantle and crustal components in a short-lived subduction-related magma system, Dry Valleys area, Antarctica: Insights from U-Pb geochronology, Hf isotopes, and whole-rock geochemistry Open Access
Nunatak moraines as a repository of what lies beneath the East Antarctic ice sheet Available to Purchase
The particle size and provenance signature of glacial till from the Lonewolf Nunataks at the head of Byrd Glacier, Antarctica, show evidence of subglacial origin and therefore provide new information about ice-covered bedrock of East Antarctica. Particle-size data from ice-cored moraines at Lonewolf Nunataks show more abundant silt and clay (>50% fines) than active lateral moraines along downstream sites (<10% fines), and 25% of pebbles are faceted and/or striated. Sand and pebbles from moraines at Lonewolf Nunataks are a mix of locally derived Beacon Supergroup rocks and exotic felsic igneous and metamorphic rocks. The U/Pb detrital zircon data from the Lonewolf Nunataks till show significant populations of zircon ages, including early Ross and/or Pan-African ages of ca. 565–610 Ma, Grenville ages (ca. 950–1270 Ma), several Proterozoic peaks, and one prominent late Archean peak at ca. 2700 Ma. 40 Ar/ 39 Ar analyses of detrital hornblende and mica also show Ross and/or Pan-African ages from ca. 500 to 580 Ma, with a population of Grenville-age hornblende grains of ca. 1150–1250 Ma. This combination of geochronological tools can be used to identify recycled versus primary age populations eroded by the ice sheet, and so provide constraints on the age and distribution of unmapped, ice-covered bedrock. Our data show that petrologic and geochronologic signatures in East Antarctic till can be used to address geologic problems ranging from Cenozoic ice sheet history to Precambrian bedrock geology.