Evidence for protracted High Arctic large igneous province magmatism in the central Sverdrup Basin from stratigraphy, geochronology, and paleodepths of saucer-shaped sills

Evenchick, C A; Davis, W J; Bédard, Jean H.; Hayward, N; Friedman, Richard M.

doi:10.1130/b31190.1

Cited by 81 publications

(75 citation statements)

References 64 publications

(81 reference statements)

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“…The main phase of basalt volcanism took place in the Late Barremian to Early Aptian, upper Isachsen Formation (ca. 127-115 Ma) mainly on Axel Heiberg Island (Embry & Osadetz, 1988 (Evenchick et al, 2015), as well as volcaniclastic sandstones (Embry & Osadetz, 1988), and bentonite layers (Schröder-Adams et al, 2014) on Axel Heiberg Island.…”

Section: The Halip-related Cretaceous Magmatism Of the Canadian Arcticmentioning

confidence: 99%

“…On Ellef Ringnes Island, a main intrusive interval at 126-121 Ma is related to the emplacement of saucer-shaped sills (Evenchick et al, 2015). This time interval overlaps with Isachsen basalt volcanism on Axel Heiberg Island.…”

Section: Canadian Arcticmentioning

confidence: 99%

“…1 & 2). The oldest basalt flows and volcaniclastic deposits occur within the lower Isachsen Formation at Axel Heiberg Island (Embry & Osadetz, 1988) and Ellef Ringnes Island at c. 130 Ma (Evenchick et al, 2015). The main phase of basalt volcanism took place in the Late Barremian to Early Aptian, upper Isachsen Formation (ca.…”

Section: The Halip-related Cretaceous Magmatism Of the Canadian Arcticmentioning

confidence: 99%

“…3 MPFZ -Mitchell Point Fault Zone, PBF -Petersen Bay Fault, PI -Phillips Inlet, WIC -Wootton Intrusive Complex, YB -Yelverton Bay. and sanidine data, MacRae et al, 1996), of 102.5 ± 2.6 Ma (whole-rock age, Estrada & Henjes-Kunst, 2013) and of 95.3 ± 0.4 Ma (whole-rock age, Tarduno et al, 1998) were reported for the Strand Fiord Formation. Basalts within the stratigraphically equivalent Hassel Formation are exposed on northern Amund Ringnes Island (Balkwill, 1983), Ellef Ringnes Island (Evenchick et al, 2015), and northeast Ellesmere Island (Embry & Osadetz, 1988;Osadetz & Moore 1988). The mildly alkaline Hassel Formation basalts from NE Ellesmere Island have an ArAr whole-rock age of 96.4 ± 1.6 Ma (Estrada, 2015).…”

Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

“…Renewed volcanic activity on Ellef Ringnes Island between c. 105 and 101 Ma (Evenchick et al, 2015) overlaps with the Strand Fiord basalt volcanism on Axel Heiberg Island and western Ellesmere Island (Fig. 2) as well as with the rhyodacite volcanism and the ongoing intrusion of mafic dykes in the Yelverton Bay area.…”

Section: Canadian Arcticmentioning

confidence: 99%

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Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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The poorly studied Alpha-Mendeleev Ridge of the Amerasia Basin of the Arctic Ocean is covered by a large magnetic high and interpreted to be part of the Cretaceous High Arctic Large Igneous Province (HALIP). At the north coast of Ellesmere Island, in the Yelverton Bay area, this characteristic magnetic high overlaps the shelf and the coastal area. Results of aeromagnetic surveys, geological fieldwork, geochronological, geochemical and Sr-Nd isotope analysis were combined to study the tectonic history of this part of the Canadian Polar margin. The basement, consisting of metamorphic rocks of the Pearya Terrane, was strongly affected by HALIP-related magmatism that is responsible for characteristic positive magnetic anomaly patterns. A broad magnetic high that can be traced to the Alpha Ridge covers the shelf and coastal areas of Yelverton Bay. It is caused by a voluminous intrusion into the continental crust at a depth of ca. 6-15 km. A chain of small positive magnetic anomalies crosses Wootton Peninsula from SW to NE and then curves into a NNE-SSW trend. It follows the coastline onshore and offshore and superimposes the southern and eastern margins of the broad magnetic high. On land, the anomaly chain covers fault-bounded outcrops of the Wootton Intrusive Complex (WIC) and the Hansen Point Volcanic Complex (HPVC), indicating that the entire anomaly chain is associated with a volcanogenic sequence. Rhyodacite that forms large parts of the HPVC east and west of Yelverton Bay extruded between c. 104 and 97 Ma (LA-ICP-MS U-Pb zircon ages). It originates from a tholeiitc suite and is probably genetically related to the deep intrusion. The HPVC together with the rhyodacite has an age range of c. 104-74 Ma and includes the mildly alkaline WIC (93-92 Ma). The northern coast of Ellesmere Island shows some characteristic features of a magma-rich rifted margin indicating an extensional evolution parallel to the North American margin between the openings of the Canada Basin and the Eurasian Basin.

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Section: The Halip-related Cretaceous Magmatism Of the Canadian Arcticmentioning

confidence: 99%

Section: Canadian Arcticmentioning

confidence: 99%

Section: The Halip-related Cretaceous Magmatism Of the Canadian Arcticmentioning

confidence: 99%

Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

Section: Canadian Arcticmentioning

confidence: 99%

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Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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Evidence for slab material under Greenland and links to Cretaceous High Arctic magmatism

Shephard

Trønnes

Spakman

et al. 2016

Geophysical Research Letters

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Understanding the evolution of extinct ocean basins through time and space demands the integration of surface kinematics and mantle dynamics. We explore the existence, origin, and implications of a proposed oceanic slab burial ground under Greenland through a comparison of seismic tomography, slab sinking rates, regional plate reconstructions, and satellite‐derived gravity gradients. Our preferred interpretation stipulates that anomalous, fast seismic velocities at 1000–1600 km depth imaged in independent global tomographic models, coupled with gravity gradient perturbations, represent paleo‐Arctic oceanic slabs that subducted in the Mesozoic. We suggest a novel connection between slab‐related arc mantle and geochemical signatures in some of the tholeiitic and mildly alkaline magmas of the Cretaceous High Arctic Large Igneous Province in the Sverdrup Basin. However, continental crustal contributions are noted in these evolved basaltic rocks. The integration of independent, yet complementary, data sets provides insight into present‐day mantle structure, magmatic events, and relict oceans.

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Building and breaking a large igneous province: An example from the High Arctic

Døssing¹,

Gaina

Brozena

2017

Geophysical Research Letters

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The genesis of the Amerasia Basin in the Arctic Ocean has been difficult to discern due to overprint of the Cretaceous High‐Arctic Large Igneous Province (HALIP). Based on detailed analysis of bathymetry data, new Arctic magnetic and gravity compilations, and recently published radiometric and seismic data, we present a revised plate kinematic model of the northernmost Amerasia Basin. We show that the smaller Makarov Basin is formed by rifting and seafloor spreading during the latest Cretaceous (to middle Paleocene). The opening progressively migrated into the Alpha Ridge structure, which was the focus of Early‐to‐Middle Cretaceous HALIP formation, causing breakup of the proto‐Alpha Ridge into the present‐day Alpha Ridge and Alpha Ridge West Plateau. We propose that breakup of the Makarov Basin was triggered by extension between the North America and Eurasian plates and possibly North Pacific plate rollback.

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Evidence for protracted High Arctic large igneous province magmatism in the central Sverdrup Basin from stratigraphy, geochronology, and paleodepths of saucer-shaped sills

Cited by 81 publications

References 64 publications

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Evidence for slab material under Greenland and links to Cretaceous High Arctic magmatism

Building and breaking a large igneous province: An example from the High Arctic

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