Geochemical and Sr–Nd isotope variations within Cretaceous continental flood-basalt suites of the Canadian High Arctic, with a focus on the Hassel Formation basalts of northeast Ellesmere Island

Estrada, Solveig

doi:10.1007/s00531-014-1066-x

Cited by 29 publications

(38 citation statements)

References 76 publications

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“…2; data from Estrada & HenjesKunst, 2004). The Sr and Nd isotope ratios of the mildly alkaline, low-phosphorous (LP) and high-phosphorous (HP) Hassel basalts from northeast Ellesmere Island also correspond with the 'steep' trend 1 (Estrada, 2015). The c. 100 Ma old HPVC rhyodacite, the HPVC rhyolite and two trachyandesite samples, the samples from the dykes cutting Pearya rocks, the WIC microgranite as well as the Isachsen and Strand Fiord basalts (data from Estrada & Henjes-Kunst, 2004) follow a second, 'flat' trend towards high-Sr isotope ratios.…”

Section: And the Line Of Ocean-island Basalt (Oib) Are Shown For Compmentioning

confidence: 91%

“…2) as well as with the rhyodacite volcanism and the ongoing intrusion of mafic dykes in the Yelverton Bay area. However, Late Cretaceous mildly alkaline magmatism that started in northern Ellesmere Island at c. 96 Ma (Estrada, 2015) is not recorded in the central Sverdrup Basin. alkaline volcanism on northeast Ellesmere Island that is recorded by volcanic pebbles with Ar-Ar ages of 61-58 Ma, which form part of the clastic infill of Palaeogene pull-apart basins along the Canadian side of Nares Strait (Estrada et al, 2010).…”

Section: Canadian Arcticmentioning

confidence: 95%

“…Late Cretaceous to Palaeogene, alkaline, mafic to felsic suites are known in North Greenland and in the Canadian Arctic (e.g., Dawes & Soper, 1970;Batten et al, 1981, Brown et al, 1987Embry & Osadetz, 1988;Estrada et al, 2010). Their genetic relationship to the older, dominantly tholeiitic suites is still under debate Estrada, 2015).…”

Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

“…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%

“…In the Ti-V diagram (Shervais, 1982), most of the mafic igneous samples including the tholeiitic varieties plot in the field for ocean-island (Shervais, 1982) (Pearce et al, 1984 Cox et al (1979) with the dividing line between alkaline and subalkaline magma series from Miyashiro (1978) Estrada, 2015) Sun & McDonough (1989). Estrada, 2015) Sun & McDonough (1989).…”

Section: Geochemical Characterisation Of the Cretaceous Igneous Rocksmentioning

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: And the Line Of Ocean-island Basalt (Oib) Are Shown For Compmentioning

confidence: 91%

Section: Canadian Arcticmentioning

confidence: 95%

Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

Section: Geochemical Characterisation Of the Cretaceous Igneous Rocksmentioning

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

Self Cite

View full text Add to dashboard Cite

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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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Sedimentary Mercury Enrichments as a Marker for Submarine Large Igneous Province Volcanism? Evidence From the Mid‐Cenomanian Event and Oceanic Anoxic Event 2 (Late Cretaceous)

Scaife

Ruhl

Dickson

et al. 2017

Geochem Geophys Geosyst

101

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Oceanic Anoxic Event 2 (OAE 2), during the Cenomanian‐Turonian transition (∼94 Ma), was the largest perturbation of the global carbon cycle in the mid‐Cretaceous and can be recognized by a positive carbon‐isotope excursion in sedimentary strata. Although OAE 2 has been linked to large‐scale volcanism, several large igneous provinces (LIPs) were active at this time (e.g., Caribbean, High Arctic, Madagascan, Ontong‐Java) and little clear evidence links OAE 2 to a specific LIP. The Mid‐Cenomanian Event (MCE, ∼96 Ma), identified by a small, 1‰ positive carbon‐isotope excursion, is often referred to as a prelude to OAE 2. However, no underlying cause has yet been demonstrated and its relationship to OAE 2 is poorly constrained. Here we report sedimentary mercury (Hg) concentration data from four sites, three from the southern margin of the Western Interior Seaway and one from Demerara Rise, in the equatorial proto‐North Atlantic Ocean. We find that, in both areas, increases in mercury concentrations and Hg/TOC ratios coincide with the MCE and the OAE 2. However, the increases found in these sites are of a lower magnitude than those found in records of many other Mesozoic events, possibly characteristic of a marine rather than atmospheric dispersal of mercury for both events. Combined, the new mercury data presented here are consistent with an initial magmatic pulse at the time of the MCE, with a second, greater pulse at the onset of OAE 2, possibly related to the emplacement of LIPs in the Pacific Ocean and/or the High Arctic.

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Geochemical and Sr–Nd isotope variations within Cretaceous continental flood-basalt suites of the Canadian High Arctic, with a focus on the Hassel Formation basalts of northeast Ellesmere Island

Cited by 29 publications

References 76 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

Sedimentary Mercury Enrichments as a Marker for Submarine Large Igneous Province Volcanism? Evidence From the Mid‐Cenomanian Event and Oceanic Anoxic Event 2 (Late Cretaceous)

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