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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Arctic Ocean
-
Alpha Cordillera (5)
-
Amerasia Basin (1)
-
Canada Basin (2)
-
Mendeleyev Ridge (1)
-
Norwegian Sea
-
Kolbeinsey Ridge (1)
-
-
-
Arctic region
-
Greenland
-
Disko Island (1)
-
East Greenland (1)
-
Uummannaq Greenland (1)
-
-
Russian Arctic
-
Franz Josef Land (1)
-
Wrangel Island (1)
-
-
Svalbard (2)
-
-
Asia
-
Siberia (1)
-
Wrangel Island (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Reykjanes Ridge (1)
-
-
-
Australasia
-
Australia
-
Northern Territory Australia (1)
-
-
-
Baffin Bay (2)
-
Banks Island (1)
-
Bathurst Island (1)
-
Canada
-
Arctic Archipelago (63)
-
Eastern Canada
-
Lancaster Sound (1)
-
-
Nunavut
-
Ellesmere Island
-
Fosheim Peninsula (3)
-
-
Lancaster Sound (1)
-
Sverdrup Basin (42)
-
Sverdrup Islands
-
Amund Ringnes Island (5)
-
Axel Heiberg Island (77)
-
Ellef Ringnes Island (15)
-
Meighen Island (5)
-
-
-
Queen Elizabeth Islands
-
Ellesmere Island
-
Fosheim Peninsula (3)
-
-
Sverdrup Basin (42)
-
Sverdrup Islands
-
Amund Ringnes Island (5)
-
Axel Heiberg Island (77)
-
Ellef Ringnes Island (15)
-
Meighen Island (5)
-
-
-
Western Canada
-
British Columbia (1)
-
Northwest Territories (68)
-
Yukon Territory (2)
-
-
-
Commonwealth of Independent States
-
Russian Federation
-
Arkhangelsk Russian Federation
-
Franz Josef Land (1)
-
-
Russian Arctic
-
Franz Josef Land (1)
-
Wrangel Island (1)
-
-
Ural region (1)
-
-
Urals (1)
-
-
Europe
-
Arkhangelsk Russian Federation
-
Franz Josef Land (1)
-
-
Western Europe
-
Iceland (1)
-
-
-
Melville Island (5)
-
North America
-
Canadian Shield (2)
-
Gulf Coastal Plain (1)
-
Western Interior
-
Western Interior Seaway (2)
-
-
-
Otto Fjord (2)
-
Pacific Ocean
-
South Pacific
-
Southwest Pacific
-
Campbell Plateau (1)
-
-
-
West Pacific
-
Southwest Pacific
-
Campbell Plateau (1)
-
-
-
-
polar regions (1)
-
United States
-
Alaska (2)
-
Louisiana (1)
-
-
-
commodities
-
metal ores
-
cobalt ores (1)
-
copper ores (3)
-
nickel ores (3)
-
platinum ores (2)
-
zinc ores (1)
-
-
mineral deposits, genesis (1)
-
mineral exploration (2)
-
petroleum
-
natural gas (1)
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (12)
-
C-14 (5)
-
organic carbon (1)
-
-
chemical ratios (3)
-
hydrogen
-
D/H (1)
-
deuterium (1)
-
-
isotope ratios (19)
-
isotopes
-
radioactive isotopes
-
C-14 (5)
-
-
stable isotopes
-
C-13/C-12 (12)
-
D/H (1)
-
deuterium (1)
-
Hf-177/Hf-176 (2)
-
N-15/N-14 (1)
-
Nd-144/Nd-143 (2)
-
O-18/O-16 (5)
-
S-34/S-32 (1)
-
Sr-87/Sr-86 (1)
-
-
-
metals
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
aluminum (2)
-
hafnium
-
Hf-177/Hf-176 (2)
-
-
iron
-
ferric iron (1)
-
ferrous iron (1)
-
-
mercury (1)
-
molybdenum (2)
-
platinum group
-
platinum ores (2)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (2)
-
-
-
-
nitrogen
-
N-15/N-14 (1)
-
-
oxygen
-
O-18/O-16 (5)
-
-
sulfur
-
S-34/S-32 (1)
-
-
trace metals (1)
-
-
fossils
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Aves (1)
-
Mammalia
-
Theria
-
Eutheria
-
Perissodactyla (1)
-
-
-
-
Reptilia
-
Anapsida
-
Testudines (2)
-
-
-
-
-
-
fungi (1)
-
Graptolithina (1)
-
Hemichordata (1)
-
ichnofossils (1)
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Ostracoda (1)
-
-
Insecta (1)
-
-
-
Brachiopoda
-
Articulata (1)
-
-
Bryozoa (1)
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Hiatella
-
Hiatella arctica (1)
-
-
-
Pterioida
-
Pteriina
-
Pectinacea
-
Monotis (1)
-
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
Scaphites (1)
-
-
-
-
Porifera
-
Demospongea (1)
-
-
Protista
-
Foraminifera
-
Rotaliina
-
Rotaliacea
-
Nummulitidae (1)
-
-
-
-
-
-
microfossils
-
Conodonta (1)
-
problematic microfossils (1)
-
-
palynomorphs
-
acritarchs (2)
-
Dinoflagellata (6)
-
miospores
-
pollen (6)
-
-
-
Plantae
-
algae
-
diatoms (2)
-
Microcodium (1)
-
nannofossils (1)
-
Rhodophyta (1)
-
-
Spermatophyta
-
Angiospermae (1)
-
Gymnospermae
-
Bennettitales (1)
-
Coniferae (1)
-
Coniferales
-
Cupressaceae (1)
-
Taxodiaceae
-
Metasequoia (5)
-
-
-
-
-
-
problematic fossils
-
problematic microfossils (1)
-
-
Pterobranchia (1)
-
thallophytes (2)
-
-
geochronology methods
-
Ar/Ar (1)
-
paleomagnetism (5)
-
racemization (1)
-
Sm/Nd (1)
-
tree rings (1)
-
U/Pb (12)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene
-
lower Holocene (3)
-
-
Innuitian ice sheet (3)
-
Pleistocene
-
upper Pleistocene
-
Wisconsinan
-
upper Wisconsinan (3)
-
-
-
-
upper Quaternary (1)
-
-
Tertiary
-
lower Tertiary (2)
-
Neogene
-
Pliocene
-
upper Pliocene (1)
-
-
-
Paleogene
-
Eocene
-
lower Eocene (1)
-
middle Eocene (6)
-
-
Paleocene (1)
-
-
-
-
Laurentide ice sheet (1)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Albian
-
upper Albian (2)
-
-
Aptian (3)
-
Barremian (2)
-
Christopher Formation (8)
-
Hauterivian (2)
-
Isachsen Formation (7)
-
Valanginian (4)
-
-
Middle Cretaceous (2)
-
Upper Cretaceous
-
Campanian (3)
-
Cenomanian
-
upper Cenomanian (1)
-
-
Coniacian (4)
-
Kanguk Formation (9)
-
Maestrichtian (2)
-
Santonian (1)
-
Senonian (7)
-
Turonian (2)
-
-
-
Jurassic
-
Lower Jurassic
-
middle Liassic (1)
-
Pliensbachian (1)
-
Toarcian (2)
-
upper Liassic (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
Bajocian (1)
-
Bathonian (1)
-
-
Upper Jurassic
-
Tithonian (1)
-
Volgian (2)
-
-
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
Upper Triassic
-
Norian (2)
-
-
-
-
Paleozoic
-
Cambrian
-
Lower Cambrian (1)
-
-
Carboniferous
-
Pennsylvanian
-
Upper Pennsylvanian (1)
-
-
Upper Carboniferous (1)
-
-
Devonian
-
Lower Devonian (1)
-
Middle Devonian (1)
-
Upper Devonian (1)
-
-
lower Paleozoic (1)
-
Ordovician (3)
-
Permian
-
Guadalupian
-
Roadian (1)
-
Wordian (1)
-
-
Lower Permian
-
Cisuralian
-
Kungurian (1)
-
-
-
Middle Permian (1)
-
Upper Permian
-
Permian-Triassic boundary (1)
-
-
-
Silurian
-
Lower Silurian
-
Llandovery (1)
-
-
-
upper Paleozoic (3)
-
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic (2)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
diabase (1)
-
diorites (1)
-
gabbros (3)
-
syenites (1)
-
-
volcanic rocks
-
basalts
-
alkali basalts (1)
-
flood basalts (1)
-
tholeiite (1)
-
-
dacites (1)
-
pyroclastics
-
tuff (1)
-
-
-
-
volcanic ash (1)
-
-
metamorphic rocks
-
metamorphic rocks
-
metaigneous rocks
-
metabasalt (1)
-
-
metasedimentary rocks
-
metasandstone (1)
-
-
-
-
minerals
-
carbonates
-
aragonite (1)
-
calcite (1)
-
ikaite (1)
-
-
halides
-
chlorides
-
halite (2)
-
-
-
minerals (3)
-
organic minerals
-
amber (1)
-
-
oxides
-
baddeleyite (1)
-
-
silicates
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (9)
-
-
-
-
sheet silicates
-
chlorite group
-
chamosite (1)
-
chlorite (1)
-
-
clay minerals
-
kaolinite (1)
-
montmorillonite (1)
-
smectite (1)
-
vermiculite (1)
-
-
illite (1)
-
serpentine group
-
berthierine (1)
-
-
-
-
sulfates
-
anhydrite (6)
-
gypsum (1)
-
jarosite (1)
-
-
sulfides
-
pyrite (2)
-
-
-
Primary terms
-
absolute age (17)
-
Arctic Ocean
-
Alpha Cordillera (5)
-
Amerasia Basin (1)
-
Canada Basin (2)
-
Mendeleyev Ridge (1)
-
Norwegian Sea
-
Kolbeinsey Ridge (1)
-
-
-
Arctic region
-
Greenland
-
Disko Island (1)
-
East Greenland (1)
-
Uummannaq Greenland (1)
-
-
Russian Arctic
-
Franz Josef Land (1)
-
Wrangel Island (1)
-
-
Svalbard (2)
-
-
Asia
-
Siberia (1)
-
Wrangel Island (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Reykjanes Ridge (1)
-
-
-
atmosphere (1)
-
Australasia
-
Australia
-
Northern Territory Australia (1)
-
-
-
biogeography (4)
-
Canada
-
Arctic Archipelago (63)
-
Eastern Canada
-
Lancaster Sound (1)
-
-
Nunavut
-
Ellesmere Island
-
Fosheim Peninsula (3)
-
-
Lancaster Sound (1)
-
Sverdrup Basin (42)
-
Sverdrup Islands
-
Amund Ringnes Island (5)
-
Axel Heiberg Island (77)
-
Ellef Ringnes Island (15)
-
Meighen Island (5)
-
-
-
Queen Elizabeth Islands
-
Ellesmere Island
-
Fosheim Peninsula (3)
-
-
Sverdrup Basin (42)
-
Sverdrup Islands
-
Amund Ringnes Island (5)
-
Axel Heiberg Island (77)
-
Ellef Ringnes Island (15)
-
Meighen Island (5)
-
-
-
Western Canada
-
British Columbia (1)
-
Northwest Territories (68)
-
Yukon Territory (2)
-
-
-
carbon
-
C-13/C-12 (12)
-
C-14 (5)
-
organic carbon (1)
-
-
Cenozoic
-
Quaternary
-
Holocene
-
lower Holocene (3)
-
-
Innuitian ice sheet (3)
-
Pleistocene
-
upper Pleistocene
-
Wisconsinan
-
upper Wisconsinan (3)
-
-
-
-
upper Quaternary (1)
-
-
Tertiary
-
lower Tertiary (2)
-
Neogene
-
Pliocene
-
upper Pliocene (1)
-
-
-
Paleogene
-
Eocene
-
lower Eocene (1)
-
middle Eocene (6)
-
-
Paleocene (1)
-
-
-
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Aves (1)
-
Mammalia
-
Theria
-
Eutheria
-
Perissodactyla (1)
-
-
-
-
Reptilia
-
Anapsida
-
Testudines (2)
-
-
-
-
-
-
clay mineralogy (1)
-
climate change (2)
-
continental drift (1)
-
continental shelf (4)
-
crust (7)
-
Deep Sea Drilling Project
-
Leg 22
-
DSDP Site 216 (1)
-
-
Leg 29
-
DSDP Site 275 (1)
-
-
-
deformation (6)
-
diagenesis (5)
-
Earth (1)
-
ecology (3)
-
economic geology (2)
-
epeirogeny (1)
-
Europe
-
Arkhangelsk Russian Federation
-
Franz Josef Land (1)
-
-
Western Europe
-
Iceland (1)
-
-
-
faults (7)
-
folds (9)
-
foliation (2)
-
fungi (1)
-
geochemistry (9)
-
geochronology (2)
-
geomorphology (3)
-
geophysical methods (7)
-
glacial geology (12)
-
Graptolithina (1)
-
ground water (2)
-
heat flow (1)
-
Hemichordata (1)
-
hydrogen
-
D/H (1)
-
deuterium (1)
-
-
hydrology (1)
-
ichnofossils (1)
-
igneous rocks
-
plutonic rocks
-
diabase (1)
-
diorites (1)
-
gabbros (3)
-
syenites (1)
-
-
volcanic rocks
-
basalts
-
alkali basalts (1)
-
flood basalts (1)
-
tholeiite (1)
-
-
dacites (1)
-
pyroclastics
-
tuff (1)
-
-
-
-
intrusions (10)
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Ostracoda (1)
-
-
Insecta (1)
-
-
-
Brachiopoda
-
Articulata (1)
-
-
Bryozoa (1)
-
Mollusca
-
Bivalvia
-
Heterodonta
-
Hiatella
-
Hiatella arctica (1)
-
-
-
Pterioida
-
Pteriina
-
Pectinacea
-
Monotis (1)
-
-
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
Scaphites (1)
-
-
-
-
Porifera
-
Demospongea (1)
-
-
Protista
-
Foraminifera
-
Rotaliina
-
Rotaliacea
-
Nummulitidae (1)
-
-
-
-
-
-
isostasy (1)
-
isotopes
-
radioactive isotopes
-
C-14 (5)
-
-
stable isotopes
-
C-13/C-12 (12)
-
D/H (1)
-
deuterium (1)
-
Hf-177/Hf-176 (2)
-
N-15/N-14 (1)
-
Nd-144/Nd-143 (2)
-
O-18/O-16 (5)
-
S-34/S-32 (1)
-
Sr-87/Sr-86 (1)
-
-
-
lava (3)
-
magmas (1)
-
mantle (1)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Albian
-
upper Albian (2)
-
-
Aptian (3)
-
Barremian (2)
-
Christopher Formation (8)
-
Hauterivian (2)
-
Isachsen Formation (7)
-
Valanginian (4)
-
-
Middle Cretaceous (2)
-
Upper Cretaceous
-
Campanian (3)
-
Cenomanian
-
upper Cenomanian (1)
-
-
Coniacian (4)
-
Kanguk Formation (9)
-
Maestrichtian (2)
-
Santonian (1)
-
Senonian (7)
-
Turonian (2)
-
-
-
Jurassic
-
Lower Jurassic
-
middle Liassic (1)
-
Pliensbachian (1)
-
Toarcian (2)
-
upper Liassic (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
Bajocian (1)
-
Bathonian (1)
-
-
Upper Jurassic
-
Tithonian (1)
-
Volgian (2)
-
-
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
Upper Triassic
-
Norian (2)
-
-
-
-
metal ores
-
cobalt ores (1)
-
copper ores (3)
-
nickel ores (3)
-
platinum ores (2)
-
zinc ores (1)
-
-
metals
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
aluminum (2)
-
hafnium
-
Hf-177/Hf-176 (2)
-
-
iron
-
ferric iron (1)
-
ferrous iron (1)
-
-
mercury (1)
-
molybdenum (2)
-
platinum group
-
platinum ores (2)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (2)
-
-
-
-
metamorphic rocks
-
metaigneous rocks
-
metabasalt (1)
-
-
metasedimentary rocks
-
metasandstone (1)
-
-
-
metamorphism (2)
-
metasomatism (1)
-
mineral deposits, genesis (1)
-
mineral exploration (2)
-
mineralogy (2)
-
minerals (3)
-
nitrogen
-
N-15/N-14 (1)
-
-
North America
-
Canadian Shield (2)
-
Gulf Coastal Plain (1)
-
Western Interior
-
Western Interior Seaway (2)
-
-
-
Ocean Drilling Program
-
Leg 121
-
ODP Site 758 (1)
-
-
-
oceanography (2)
-
orogeny (4)
-
oxygen
-
O-18/O-16 (5)
-
-
Pacific Ocean
-
South Pacific
-
Southwest Pacific
-
Campbell Plateau (1)
-
-
-
West Pacific
-
Southwest Pacific
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Discussion of “Age and significance of the fire bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada”
Reply to the discussion by Hadlari on “age and significance of the fire bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada”
Microfossils in resin from the middle Eocene Buchanan Lake Formation, Napartulik, Axel Heiberg Island, Nunavut, Canada
A thick succession of upper Paleozoic carbonate rocks and minor chert crops out north of the head of Otto Fiord (northwest [NW] Ellesmere Island, Nunavut) in the Canadian Arctic Archipelago. These rocks accumulated in a tectonic subbasin—the Otto Fiord Depression (OFD)—of the Sverdrup Basin that likely originated through rifting during late Early Carboniferous (Serpukhovian). Following a long interval of passive subsidence that allowed a thick succession of Moscovian–Kasimovian carbonate rocks to fill the OFD, tectonic activity resumed during the Gzhelian (Late Pennsylvanian). This resulted in rapid collapse of the depression along its axis and simultaneous uplifts of its margins, a style of tectonism in accord with the inferred basin-wide shift to a transpressional–transtensional stress regime at that time. Late Pennsylvanian–Early Permian sedimentation in the OFD led to the development of four long-term (second-order) transgressive–regressive sequences of early Gzhelian–middle Asselian (<1200 m), late Asselian–late Sakmarian (<380 m), latest Sakmarian–late Artinskian (<160 m) and latest Artinskian–late Kungurian (<60 m) age. These ages are supported by integration of biostratigraphic data from conodonts, fusulinaceans, and small foraminifers. The development of each sequence-bounding unconformity was associated with renewed tectonism in the OFD. Each sequence recorded the development of a depositional system characterized by high energy peripheral shoreface grainstones passing basinward across a gently dipping ramp into deep-water basinal calcareous and siliceous mudstone. The ramp portion of the early Gzhelian–middle Asselian system comprises both cool-heterozoan to warmphotozoan carbonates (Nansen Formation) suggesting a relatively shallow thermocline at that time. These rocks are arranged in a series of high-order cyclothems of glacio-eustatic origin. Cyclothemic sedimentation ended at the Asselian–Sakmarian boundary, simultaneous to a major depositional system shift to cool-water heterozoan sedimentation (Raanes Formation), a change presumably brought on by the closure of the Uralian seaway linking NW Pangea with the Tethyan Ocean. This event led to the destruction of the permanent thermocline, and disappearance of photozoan carbonates by the early Sakmarian despite rising temperatures globally. Cool-water heterozoan sedimentation, associated with relatively shallow outer-ramp to midramp spiculitic chert resumed in the Artinskian and then again in the Kungurian (Great Bear Cape Formation) when the OFD was filled up. The depression ceased to exist as a separate tectonic/subsidence entity with the widespread sub-Middle Permian unconformity, above which sediments were deposited during a passive subsidence regime across most of the Sverdrup Basin. The Pennsylvanian–Lower Permian succession that accumulated in the OFD along the clastic-free northern margin of the Sverdrup Basin is essentially identical, both in terms of tectonic evolution and stratigraphic development, with the coeval succession of Raanes Peninsula, southwest (SW) Ellesmere Island, the type area of the Raanes, Trappers Cove, and Great Bear Cape formations along the clastic-influenced southern margin.
Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada
Meighen Ice Cap: changes in geometry, mass, and climatic response since 1959
ABSTRACT Meighen Island, in the Canadian Arctic Archipelago, is one of the most important localities for study of the late Neogene Beaufort Formation because of the presence of marine sediments interbedded with terrestrial fossiliferous sands. The stratigraphic succession, fossils from the marine beds, correlation with reconstructions of sea level, and paleomagnetic data from the Bjaere Bay region of the island suggest that the Beaufort Formation on Meighen Island was likely deposited either at 3.2–2.9 Ma or during two intervals at ca. 4.5 Ma and 3.4 Ma. The exposed Beaufort Formation on Meighen Island probably encompasses at least one warm interval and eustatic sea-level highstand of the Pliocene. Fossils of plants and arthropods are abundant in the alluvial sands exposed in the Bjaere Bay region. The lower part of the sequence (Unit A), beneath the muddy marine sequence (Unit B), contains plant taxa that have not been seen above the marine beds. Sediments below the marine beds are dominated more by fossils of trees, whereas the organic debris from above marine beds contains many fossils of plants, insects, and mites characteristic of open treeless sites. Regional tree line probably occurred on Meighen Island during deposition of the upper sediments, which implies a mean July climate at least 9 °C warmer than at present. When the marine sediments were deposited, nearshore water temperatures probably did not fall below 0 °C; hence, the Arctic Ocean probably lacked perennial ice cover. This confirms recent modeling experiments exploring the causes of Arctic amplification of temperature that have found the removal of sea ice to be a key factor in resolving previous proxy-model mismatches.
Carbon isotope and sequence stratigraphy of the upper Isachsen Formation on Axel Heiberg Island (Nunavut, Canada): High Arctic expression of oceanic anoxic event 1a in a deltaic environment
New constraints on the age, geochemistry, and environmental impact of High Arctic Large Igneous Province magmatism: Tracing the extension of the Alpha Ridge onto Ellesmere Island, Canada
Calibration of Middle to Upper Jurassic palynostratigraphy with Boreal ammonite zonations in the Canadian Arctic
Upper Paleozoic stratigraphy and detrital zircon geochronology along the northwest margin of the Sverdrup Basin, Arctic Canada: insight into the paleogeographic and tectonic evolution of Crockerland
Finding the VOICE: organic carbon isotope chemostratigraphy of Late Jurassic – Early Cretaceous Arctic Canada
Controls on the formation of microbially induced sedimentary structures and biotic recovery in the Lower Triassic of Arctic Canada
Enigmatic massive sulphide mineralization in the High Arctic Large Igneous Province, Nunavut, Canada
ABSTRACT Ellef Ringnes Island in the western Queen Elizabeth Islands near the Canadian Polar margin is characterized by intrusions of Cretaceous mafic sills and dikes related to the Canadian portion of the High Arctic Large Igneous Province (HALIP) and the presence of a unique network of NNE–SSW and WSW–ENE striking steep faults. The exposed dikes on northern Ellef Ringnes Island are mostly oriented parallel to the NNE–SSW faults according to the radiating dike swarm of the HALIP. The studied sills and dikes are geochemically very homogeneous and probably related to the same intrusion event at ca. 121 Ma. They share geochemical similarities with other tholeiitic basaltic rocks related to the first stage of the HALIP (ca. 130–120 Ma) that are exposed on Axel Heiberg and northern Ellesmere islands. All these suites were probably generated from a common large magmatic center related to a mantle plume. The NNE–SSW striking faults are characterized by dextral strike-slip kinematics active after ca. 100 Ma (after the intrusion of the Early Cretaceous sills and dykes and the deposition of the Christopher Formation) and before the deposition of the Neogene Arctic continental terrace wedge. However, they cannot be related to the dextral strike-slip regime parallel to the continental margin during stage 2 of the Eurekan deformation in the Late Eocene. Instead, the NNE–SSW dextral faults may represent dextral antithetic Riedel faults of a wide, NE–SW striking, anastomosing strike-slip fault zone along the northern continental margin of North America, which was possibly active during Eurekan stage 1 in the Early Eocene.