Structure of Palaeogene sediments in east Ellesmere Island: Constraints on Eurekan tectonic evolution and implications for the Nares Strait problem

Saalmann, Kerstin; Tessensohn, F.; Piepjohn, Karsten; Gosen, Werner von; Mayr, U

doi:10.1016/j.tecto.2005.06.005

Cited by 29 publications

(36 citation statements)

References 21 publications

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“…The strong compressive deformation by Eocene Eurekan thrust tectonics that has affected the deposits of the Cape Back basin (Miall 1982;Saalmann et al 2005) is also present in the conglomeratic sandstones of the sample location. Small scale shears (Fig.…”

Section: Cape Back Basin and Description Of The Sample Locationmentioning

confidence: 87%

“…56-33 Ma) (e.g., Srivastava and Tapscott 1986;Tessensohn and Piepjohn 2000). (after Okulitch 1991;Saalmann et al 2005;Piepjohn et al 2007) and the outlines of positive magnetic anomalies (from Damaske and Oakey 2006). Ice cover not considered.…”

Section: Geological Settingmentioning

confidence: 99%

“…More recently, the whole sequence has been subdivided into the basal Pavy Formation (member 1 of Miall 1982) that is overlain by the interfingering Cape Lawrence (mainly member 4) and Cape Back formations (mainly members 2 and 3) Mayr et al 2007). However, the four members (and thus the 3 formations) represent lateral and vertical interfingering facies units rather than clear age relationships (Saalmann et al 2005). Despite abundance of plant material, index fossils are lacking.…”

Section: Cape Back Basin and Description Of The Sample Locationmentioning

confidence: 99%

“…The onshore survey was followed in 2001 by a German-Canadian, mainly geophysical cruise in Nares Strait (Tessensohn et al 2006). Indications for sinistral strike-slip movements followed by compressive tectonics were found at the western margin of northern Nares Strait (Saalmann et al 2005).…”

Section: Introductionmentioning

confidence: 96%

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Paleocene alkaline volcanism in the Nares Strait region: evidence from volcanic pebbles

Estrada

Henjes‐Kunst

Melcher

et al. 2009

Int J Earth Sci (Geol Rundsch)

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Paleogene sediments in fault-bounded basins on Judge Daly Promontory, northeast Ellesmere Island, Canadian High Arctic, are rich in volcanogenic material. Volcanic pebbles within the Cape Back basin near Nares Strait were studied for their petrography, geochemistry, Sr and Nd isotopes, and geochronology to identify and characterize their parent rock. The pebbles are derived from lava flows and ignimbrites of a continental rift-related, strongly differentiated, highly incompatible element enriched, alkaline volcanic suite, the proposed Nares Strait volcanic suite, which is distinct from other alkaline volcanic suites on the northern coasts of Ellesmere Island and Greenland. 40 Ar/ 39 Ar amphibole and alkali feldspar ages indicate that volcanism was active around 61-58 Ma and was probably contemporaneous with sedimentation resulting in Middle to Late Paleocene age for deposition within the Cape Back basin and the other Paleogene basins on Judge Daly Promontory.

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Section: Cape Back Basin and Description Of The Sample Locationmentioning

confidence: 87%

Section: Geological Settingmentioning

confidence: 99%

Section: Cape Back Basin and Description Of The Sample Locationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Paleocene alkaline volcanism in the Nares Strait region: evidence from volcanic pebbles

Estrada

Henjes‐Kunst

Melcher

et al. 2009

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

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“…1) and probably attached to the northeastern tip of the North American plate, acted as a buttress between the Greenland plate and the Arctic region (formed, at that time, by an older oceanic domain-the Amerasian Basin, and a number of smaller tectonic blocks, among them-the Lomonosov Ridge). The PaleoceneEocene compression between Greenland and Ellesmere Islands resulted in the so-called ''Eurekan'' orogeny or deformation and it is now known to have been developed in multiple stages (e.g., [37,43]). Numerous field campaigns in the last two decades to the Ellesmere islands reported features that document polyphase Eurekan deformation as complex networks of NNE-SSW and NW-SE trending faults and ESE-directed frontal thrust of the Eurekan Foldand-Thrust Belt [35].…”

Section: Eurekan Orogenymentioning

confidence: 99%

Ultraslow spreading, ridge relocation and compressional events in the East Arctic region: A link to the Eurekan orogeny?

Gaina

Nikishin

Petrov³

2015

Arktos

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New and available geophysical data from the Eastern Arctic (around the Siberian tip of the Lomonosov Ridge) indicate a change in the tectonic regime at the Eocene time. Oceanic crust identified on the new seismic reflection data in the Amundsen Basin displays an asymmetric fabric also visible in the gravity and magnetic gridded data. Tentative dating of the weak magnetic anomalies suggests asymmetric spreading or ridge relocation from ca. 49 to 33 Ma. Three seismic reflection transects through the Laptev Sea, Lomonosov Ridge and adjacent basins image several compressional features, most likely initiated in the Eocene. According to a regional plate tectonic model, the Greenland plate has pushed the Lomonosov Ridge by ca. 30 mm/year from 54 to 49 Ma and by ca. 13.5 mm/year afterwards, until Early Miocene. We suggest that intraplate stresses triggered by the Eocene to Oligocene northern movement of the Greenland plate and subsequent collision with the North American plate that created the Eurekan deformation, have propagated through the Arctic region and affected part of the East Siberian Shelf, Podvodnikov Basin, Laptev Sea and modified the spreading direction in the eastern Eurasia Basin. We estimate that these changes started at the same time as the peak compressional phase in North Greenland dated 49-47 Ma and lasted until Oligocene time when the large-scale tectonic regime changed by incorporating Greenland into the North American plate.

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A reconstruction of the Eurekan Orogeny incorporating deformation constraints

2017

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The Eurekan Orogeny records Paleogene convergence between Greenland and the Canadian Arctic. The complexity of the region, well represented by the disputed magnitude of Cenozoic sinistral displacement of Greenland relative to Ellesmere Island, stems from the simultaneous evolution of multiple tectonic regimes, as well as overprinting of later tectonic activity. Presented here is a plate model of regional crustal deformation constructed with the interactive GPlates software that enables an evaluation of previous reconstructions of the Eurekan Orogeny. This model is built upon a synthesis of published geological and geophysical data and their interpretations. It incorporates two phases of deformation from ~63 to 35 Ma. Phase 1, ~63 to ~55 Ma, involves ~85 km of Paleocene extension between Ellesmere and Devon Island, extension of ~20 km between Axel Heiberg and Ellesmere Island, and ~85 km of sinistral strike slip along the Nares Strait/Judge Daly Fault System, matching a range of 50–100 km indicated by the offset of marker beds, facies contacts, and platform margins between the conjugate Greenland and Ellesmere Island margins. Phase 2, ~55 to 35 Ma, results in total east‐west compression of ~30 km and ~200 km of north‐south compression across Ellesmere Island. This model confirms, for the first time, that key observations from subregions deformed by the Eurekan Orogeny are compatible on a broad scale. We have also identified potential problem areas in southwestern Ellesmere Island that are less compatible with a best fit model, given current constraints. This deforming plate model offers a platform and base model for future research.

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Structure of Palaeogene sediments in east Ellesmere Island: Constraints on Eurekan tectonic evolution and implications for the Nares Strait problem

Cited by 29 publications

References 21 publications

Paleocene alkaline volcanism in the Nares Strait region: evidence from volcanic pebbles

Paleocene alkaline volcanism in the Nares Strait region: evidence from volcanic pebbles

Ultraslow spreading, ridge relocation and compressional events in the East Arctic region: A link to the Eurekan orogeny?

A reconstruction of the Eurekan Orogeny incorporating deformation constraints

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