Sedimentology and stratigraphy of the Lower Cretaceous Isachsen Formation: Ellef Ringnes Island, Sverdrup Basin, Canadian Arctic Archipelago

Tullius, Dylan N.; Leier, Andrew; Galloway, Jennifer M.; Embry, Ashton F.; Pedersen, Per Kent

doi:10.1016/j.marpetgeo.2014.05.018

Cited by 18 publications

(15 citation statements)

References 38 publications

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“…Previous sequence stratigraphic studies from different parts of the Sverdrup Basin identified two (partial) transgressive-regressive (T-R) cycles in the upper Isachsen Formation (Embry, 1991;Embry and Beauchamp, 2008;Tullius et al, 2014). According to these studies, the lithological change from sandstone, dominating the Paterson Island Member, to shale, which makes up the Rondon Member, was related to base-level rise and transgression.…”

Section: Basin-scale Correlation Of Sequencesmentioning

confidence: 99%

“…To assess potential impacts of local environmental factors (e.g., changes in the source and preservation state of OC) on bulk δ 13 C org composition, lipid biomarker data are presented. Based on this refined chemostratigraphy, we revise the age of the uppermost Paterson Island, Rondon, and Walker Island Members, which represent important lithostratigraphic marker units in the Sverdrup Basin (Embry, 1985;Tullius et al, 2014). In addition, we provide a detailed sequence stratigraphic framework for the upper Isachsen Formation based on sedimentological logs and new bulk geochemical data that reveal repetitive marine incursions into the Sverdrup Basin.…”

Section: ■ Introductionmentioning

confidence: 99%

“…1A). During the early post-rift phase, fluvial and marginal marine sands propagated into the Sverdrup Basin from the southwest (Embry and Dixon, 1994;Hadlari et al, 2016); the resulting sandstones constitute the widespread Isachsen Formation (Embry, 1985(Embry, , 1991Tullius et al, 2014). The Isachsen Formation has a maximum thickness of ~1400 m in the basin center (Embry, 1991) and is commonly divided into three members (Embry, 1985).…”

Section: ■ Introductionmentioning

confidence: 99%

“…The Isachsen Formation has a maximum thickness of ~1400 m in the basin center (Embry, 1991) and is commonly divided into three members (Embry, 1985). The lowermost Paterson Island Member consists mainly of fine to very coarse sandstones (Embry, 1985), which were deposited in a marginal marine to braided-fluvial and meandering-fluvial environment (Tullius et al, 2014). Sediments of the Paterson Island Member overlie Lower Cretaceous sediments of the Deer Bay Formation with unconformable contact at the basin margins and conformable contact near the basin center (Embry, 1985).…”

Section: ■ Introductionmentioning

confidence: 99%

“…On Ellef Ringnes Island (Fig. 1A), a Valanginian age has been assigned to the basinal Paterson Island Member based on benthic foraminifera (Tullius et al, 2014). The overlying Rondon Member is a variable ~5-30-m-thick mudstone-dominated interval, which occurs over most of the Sverdrup Basin and constitutes an important lithostratigraphic marker in the sandstone-dominated Isachsen Formation (Embry, 1985).…”

Section: ■ Introductionmentioning

confidence: 99%

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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

et al. 2021

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The Early Cretaceous oceanic anoxic event (OAE) 1a documents a major perturbation of the global carbon cycle with severe consequences for the ocean-climate-biosphere system. While numerous studies over the past decades have provided a relatively detailed picture of the environmental repercussions of OAE 1a at low and mid-latitudes, studies from high latitudes, in particular the High Arctic, are limited. In this study, we present a high-resolution carbon isotopic and sequence stratigraphic framework for the lower to lower upper Aptian interval of the Isachsen Formation of the High Arctic Sverdrup Basin (Canada). These data enable us to precisely locate the stratigraphic position of OAE 1a in a deltaic sedimentary environment. The carbon isotope record allows, for the first time, identification of the different carbon isotope segments (CISs) of OAE 1a in the Sverdrup Basin and thereby correlation of the High Arctic record with sections from lower latitudes. Based on this improved chemostratigraphy, we revise the age of upper Paterson Island, Rondon, and Walker Island Members, important regional lithostratigraphic marker units. Whole-rock geochemical data record two episodes of marine incursion into the Sverdrup Basin during OAE 1a (CISs Ap3 and Ap6), which are interpreted as regional maximum flooding surfaces. This information is used in conjunction with detailed sedimentological logs and geochemical grain-size proxies to refine the sequence stratigraphic framework for the upper Isachsen Formation. We propose that transgressive-regressive cycles in the Sverdrup Basin were controlled mainly by the combined effects of eustatic sea-level changes and regional tectonic uplift, potentially related to the emplacement of Alpha Ridge, which culminated at ca. 122 Ma during CIS Ap9.

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Section: Basin-scale Correlation Of Sequencesmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%