Evolution of the Labrador Sea and its bearing on the early evolution of the North Atlantic

Srivastava, S. P.

doi:10.1111/j.1365-246x.1978.tb04235.x

Cited by 321 publications

(273 citation statements)

References 66 publications

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“…Similarly, reflector R4 terminates against anomaly 24 in much of the southern Labrador Sea (anomalies identified after Srivastava, 1978). The similar pinchouts of reflector R4 and horizon E/O in the Labrador Sea support the contention that the two may be equivalent in age.…”

Section: Labrador Seasupporting

confidence: 55%

“…Magnetic anomaly patterns suggest that these fracturezone conduits did not develop until the late Eocene to early Oligocene (Figure 2; Ruddiman, 1972). The abyssal circulation west of the mid-ocean ridge may also have been augmented by overflow across the Greenland-Scotland Ridge adjacent to Greenland and possibly by bottom water derived from the area of Baffin Bay/Nares Tectonic data and plate geometries from Ruddiman (1972), Talwani and Eldholm (1977), Srivastava (1978), and Vogt et al (1980). Figure 12A).…”

Section: Model Of Circulationmentioning

confidence: 99%

“…Crustal age underlying reflectors P1 and P2 on BGR line 1 (-shotpoint 4400; Fig. 10) is Late Cretaceous (pre-Anomaly 31; Srivastava, 1978) and the supposed lowstand fan could be the result of any one of a series of Late Cretaceous to Eocene eustatic lowerings of sea level (Vail et al, 1977). However, if the strong reflectors are -25-assumed to be extrusive (upper Paleocene) basalts, then the lowstand may correspond to an early Eocene major sea-level lowstand (Vail et al, 1977).…”

Section: Pre-r4 Sequencesmentioning

confidence: 99%

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Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic

Miller¹

1982

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Seismic stratigraphic evidence from the western and northern North Atlantic indicates that a major change in abyssal circulation occurred in the latest Eocene to earliest Oligocene. In the northern North Atlantic, the widely-distributed reflector R4 correlates with an unconformity that can be traced to its correlative conformity near the top of the Eocene. This horizon reflects a change from weakly circulating (Eocene) to vigorously circulating bottom water (early Oligocene). Sediment distribution patterns provide evidence for strong contour-following bottom water flow beginning at reflector R4 time; this suggests a northern source for this bottom water, probably from the Arctic via the Norwegian-Greenland Sea and Faeroe-Shetland Channel. Erosion and current-controlled sedimentation continued through the Oligocene; however, above reflector R3 (middle to upper Oligocene), the intensity of abyssal currents decreased. Above reflector R2 (upper lower Miocene) current-controlled sedimentation became more coherent and a major phase of sedimentary drift development began. This resulted from further reduction in speeds and stabilization of abyssal currents.Paleontological and stable isotopic data support these interpretations. In the Bay of Biscay/Goban Spur regions, a major 6180 increase began at -38 Ma (late Eocene), culminating in a rapid (< 0.5 my) increase in 6180 just above the Eocene/Oligocene boundary (~ 36.5 Ma). A rapid 6 13 C increase also occurs at -36.5 Ma in these sites. Major changes in benthic foraminiferal assemblages also occurred between the middle Eocene and the earliest Oligocene: 1) In the Labrador Sea, a predominantly agglutinated assemblage was replaced by a calcareous assemblage between the middle Eocene and early Oligocene; 2) In the abyssal (> 3km) Bay of Biscay, an indigenous Eocene calcareous fauna including Nuttallides truempyi, Clinapertina spp., Abyssammina spp., Aragonia spp., and Alabamina dissonata became extinct between the middle Eocene and earliest Ollgocene; 3) In shallower sites (< 3km paleodepth) throughout the Atlantic, a Nuttallides truempyi-dominated assemblage was replaced by a Globocassidulina subglobosa-yroidinoides-Cibicidoides ungerianus-Oridorsalis assemblage in the early late Eoce (~ 40-3 5 ma). These Taunal and isotopic changes represent the transition from warm, old, corrosive Eocene bottom waters to colder, younger (lower C02 and higher pH, hence less corrosive) early Oligocene bottom waters.

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Section: Labrador Seasupporting

confidence: 55%

Section: Model Of Circulationmentioning

confidence: 99%

Section: Pre-r4 Sequencesmentioning

confidence: 99%

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Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic

Miller¹

1982

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“…Here, we briefly describe the main belts of deformation shown on the map. Concerning more detailed descriptions and plate tectonic interpretations, the reader is referred to, for example, Kristoffersen and Talwani [35], Talwani and Eldholm [62], Srivastava [58,59] [64], CASE Team [7], Harrison et al [29], and Piepjohn et al [51,52], submitted.…”

Section: Description Of the Tectonic Mapmentioning

confidence: 99%

Tectonic map of the Ellesmerian and Eurekan deformation belts on Svalbard, North Greenland, and the Queen Elizabeth Islands (Canadian Arctic)

Piepjohn

Gosen

Tessensohn³

et al. 2015

Arktos

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“…This "moderate" distance seems to depend on the "strength" of the hotspot. Examples of major ridge jumps in relation to a hotspot include the already mentioned extinction of the Mascarene Basin spreading center and the opening of the Carlsberg Ridge in response to the inset of the Deccan-Reunion hotspot, which can be envisioned as a 1000 to 1500 km ridge jump; the progressive extinction of the Labrador Basin spreading center and the opening of the Reykjanes Ridge between Greenland and Europe [e.g., Srivastava, 1978] [Royer, 1985;Small, 1995]; and on the Coco-Nazca spreading center near the Galapagos hotspot [Wilson and Hey, 1995].…”

Section: Tiny Wiggles As a Tool To Identify Magnetic Anomalies In Commentioning

confidence: 99%

Evolution of the Carlsberg Ridge between 60 and 45 Ma: Ridge propagation, spreading asymmetry, and the Deccan‐Reunion hotspot

Dyment¹

1998

J. Geophys. Res.

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Evolution of the Labrador Sea and its bearing on the early evolution of the North Atlantic

Abstract: Geophysical data collected from 1972 to 1975 during a systematic *The name Cartwright Fracture Zone is proposed as this feature lies in the vicinity of a prominent basement high called the Cartwright Arch by McMillan (1973).

Cited by 321 publications

References 66 publications

Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic

Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic

Tectonic map of the Ellesmerian and Eurekan deformation belts on Svalbard, North Greenland, and the Queen Elizabeth Islands (Canadian Arctic)

Evolution of the Carlsberg Ridge between 60 and 45 Ma: Ridge propagation, spreading asymmetry, and the Deccan‐Reunion hotspot

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