Introduction: breakup of the Southeast Greenland Margin and the formation of the Irminger Basin: background and scientific objectives

Larsen, H. C.; Saunders, A. D.; Clift, Peter D.

doi:10.2973/odp.proc.ir.152.101.1994

Cited by 58 publications

(308 citation statements)

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“…Thicknesses of seismic sequences and units in the following descriptions are based on the preliminary TWT vs. depth relationship at Site 918 (Larsen, Saunders, Clift, et al, 1994) calibrated to acoustic velocities adopted from the GGU 1981 seismic survey (Larsen, 1990). Seismic velocities of 1700 m/s and 1750 m/s TWT have been used for Sequence γ and for α and β, respectively.…”

Section: Seismic Datamentioning

confidence: 99%

“…4,5). Site 918 provides the age control and some information on sedimentary facies (Larsen, Saunders, Clift, et al, 1994). The seismic sequences are bounded by regional unconformities referred to as SB1, SB2, and SB3 (in ascending stratigraphical order).…”

Section: Seismic Characteristicsmentioning

confidence: 99%

“…There is no drill core information from the mounded forms within the elongate drifts, but seismic Sequence γ correlates with the turbidite successions of lithologic Subunits IA and IB at Site 918 (Larsen, Saunders, Clift, et al, 1994). Apart from large ice-rafted clasts the sedimentary record is here dominated by silt and clay, hence the drift of Sequence γ most likely consists of silt or finer grained sediment, if the turbidites are the main sediment source as inferred (see also "Discussion and Conclusions" section).…”

Section: Interpretation Of Seismic Sequencesmentioning

confidence: 99%

“…The Quaternary geology of the Greenland shelves is reviewed by Funder and Larsen (1989). Preliminary interpretations of the Neogene development of the shelf can be found in Larsen et al (1994) and Lykke-Andersen (this volume). It is documented in these studies that the Greenland continent has experienced glaciation back to the late Miocene (7 Ma) and that the shelf has prograded considerably because of glacial advances across the shelf.…”

Section: Introductionmentioning

confidence: 96%

“…1). The study is based on multichannel reflection seismic data acquired by the NAD-Project (Larsen, 1985;Larsen, 1990) and the NARM-Project (Larsen et al, 1993), and ODP Leg 152 bore-hole data (Larsen, Saunders, Clift, et al, 1994). The main objective of the present paper is to describe depositional and erosional features on the slope and rise and to discuss the nature of the upper Neogene and Quaternary sediments, their deposition, and their palaeoceanographic implications.…”

Section: Introductionmentioning

confidence: 99%

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Late Neogene and Quaternary sedimentation on the continental slope and upper rise offshore southeast Greenland: interplay of contour and turbidity processes

Clausen¹

1998

Proceedings of the Ocean Drilling Program

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Three seismic sequences have been identified within the late Neogene and Quaternary deep-sea sedimentary succession on the continental slope and rise in the Irminger Basin offshore southeast Greenland. They are bounded at the base by unconformities of middle Pliocene, early Pliocene, and (?) late Miocene ages, respectively. The sequences form large, elongate drifts on the seafloor, oriented almost perpendicular to the continental rise. The seismic facies of the two youngest sequences suggest mixed deposition both from contour and turbidity currents off the then glaciated shelf. Inter-drift channel-levée complexes recognized within the youngest sequence (middle Pliocene-Pleistocene) were deposited from turbidity currents. The major turbidity channels, originating at the base of the continental slope, are prolongations of transverse shelf trough/trough-mouth fan systems. A moat zone separates the elongate drifts from the continental slope. The depth stratum of the modern southward-flowing deepsea contour-currents correlates with the position of this moat zone. It is concluded that the Labrador Sea Water Current has played a far more important role in sculpturing the continental slope and rise than earlier recognized. Mixed depositional systems as described in this paper might prove to be a widespread feature at high-latitude glaciated margins.

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Section: Seismic Datamentioning

confidence: 99%

Section: Seismic Characteristicsmentioning

confidence: 99%

Section: Interpretation Of Seismic Sequencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Late Neogene and Quaternary sedimentation on the continental slope and upper rise offshore southeast Greenland: interplay of contour and turbidity processes

Clausen¹

1998

Proceedings of the Ocean Drilling Program

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Replenishment episodes and crustal assimilation in the development of an early Tertiary magma chamber, East Greenland: evidence from layered cumulates of the Kælvegletscher ultramafic complex, Kangerlussuaq

Prægel

Holm

2001

Mineralogy and Petrology

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Geomagnetic Polarity Timescale

Langereis¹,

Krijgsman²

2019

Encyclopedia of Ocean Sciences

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Shore-based paleomagnetic investigations were conducted on Eocene-Miocene sediments recovered during Ocean Drilling Program Leg 152 drilling of the southeast Greenland Margin and the western Irminger Basin. A total of 147 specimens was analyzed. In general, the magnetostratigraphy obtained from the shipboard whole-core magnetometer studies (spot demagnetization at 25 mT) has been confirmed. However, a number of specimens yielded polarities different from those obtained by the shipboard magnetometer, calling for some caution in the interpretation of the magnetostratigraphy. During Leg 152, it proved difficult to correlate the polarity records with the geomagnetic polarity time scale because of core recovery and the limited biostratigraphic information available at the time. Since then, the shore-based biostratigraphic studies have yielded many datum points useful for correlating the refined magnetozone sequences to the polarity time scale. In terms of seaward dipping reflector formation, the new data are particularly valuable in determining their subsidence history. At Sites 915 and 917, close to the southeast Greenland ocean/continent transition, intervals of 13 m.y. and 4 m.y., respectively, elapsed before marine sedimentation commenced. Sedimentation at Site 918, in the western part of the Irminger Basin, commenced almost immediately after seaward dipping reflector formation at about 54 Ma.

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Introduction: breakup of the Southeast Greenland Margin and the formation of the Irminger Basin: background and scientific objectives

Cited by 58 publications

References 0 publications

Late Neogene and Quaternary sedimentation on the continental slope and upper rise offshore southeast Greenland: interplay of contour and turbidity processes

Late Neogene and Quaternary sedimentation on the continental slope and upper rise offshore southeast Greenland: interplay of contour and turbidity processes

Replenishment episodes and crustal assimilation in the development of an early Tertiary magma chamber, East Greenland: evidence from layered cumulates of the Kælvegletscher ultramafic complex, Kangerlussuaq

Geomagnetic Polarity Timescale

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