Mineralogy as an Indicator of Long-Term Current Fluctuations in Baffin Bay

Marlowe, James I.

doi:10.1139/e66-015

Cited by 19 publications

(12 citation statements)

References 2 publications

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“…Present‐day sediments found on the Baffin Bay sea floor are mainly derived from glacial erosion of the surrounding Greenland and CAA landmasses: through the various sedimentary processes (e.g. ice‐rafted debris (IRD), glacigenic debrisflows, meltwater plumes, turbidity currents) that are dominant in these environments (Marlowe ; Hiscott et al . ; Ó Cofaigh et al .…”

Section: Regional Settingmentioning

confidence: 99%

Holocene chronostratigraphy of northeastern Baffin Bay based on radiocarbon and palaeomagnetic data

Caron

St‐Onge

Montero‐Serrano

et al. 2018

Boreas

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The northeastern Baffin Bay continental margin, which experiences high sediment accumulation rates, is an excellent location to study Holocene sedimentary variations. However, it is often difficult to obtain reliable chronologies of the sediment archives using traditional methods (δ18O and radiocarbon) due to specific oceanographic conditions (e.g. corrosive bottom waters). Here we propose a chronostratigraphy of three cores collected on the northwestern Greenland margin (AMD14‐204, AMD14‐210 and AMD14‐Kane2B) based on a combination of radiocarbon dating and palaeomagnetic records. Geophysical properties of discrete samples were used to verify the reliability of the palaeomagnetic records. Palaeomagnetic analyses indicate a strong and stable natural remanent magnetization carried by low coercivity ferrimagnetic minerals (magnetite) in the pseudo‐single domain grain size range. Correlation of the full palaeomagnetic vector (inclination, declination, and relative palaeointensity) was used to establish a reliable chronostratigraphical framework for two of the cores (AMD14‐204 and AMD14‐210) and to propose an original palaeomagnetic record for the previously 14C‐dated core AMD14‐Kane2B that covers most of the Holocene. Overall, this new chronostratigraphy allowed improvement of the timing of the main palaeoenvironmental changes that occurred in this area during the Holocene.

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Section: Regional Settingmentioning

confidence: 99%

Holocene chronostratigraphy of northeastern Baffin Bay based on radiocarbon and palaeomagnetic data

Caron

St‐Onge

Montero‐Serrano

et al. 2018

Boreas

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“…The impact of the pre‐LGM glaciations on Baffin Bay sediment delivery is poorly known because of weak chronostratigraphies [ Vincent and Prest , 1987]. Nevertheless, sedimentary facies and the mineralogy of the late Quaternary sediments have been thoroughly described [e.g., Marlowe , 1966; Piper , 1973; Aksu , 1981; Aksu and Piper , 1987; Hiscott et al , 1989; Andrews et al , 1998]. Based on the mineralogy of detrital supplies and sediment textures, sedimentary processes were tightly controlled by glacial/interglacial (or stadial/interstadial) cycles and sediment facies could be discriminated from their deposition processes.…”

Section: Regional Settingmentioning

confidence: 99%

Late Quaternary chronostratigraphic framework of deep Baffin Bay glaciomarine sediments from high‐resolution paleomagnetic data

Simon

St‐Onge

Hillaire‐Marcel

2012

Geochem Geophys Geosyst

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[1] The late Quaternary Baffin Bay sediments provide exclusive records of Greenland, Innuitian and Laurentide ice sheet margin activities, as well as information about the Arctic and northern Atlantic ocean linkages through the Canadian Arctic Archipelago. Because of specific oceanographic conditions, foraminiferal d18 O-stratigraphies and radiocarbon ages fail to provide reliable chronologies. Here we propose an original chronostratigraphy spanning the last glacial cycle based on high-resolution paleomagnetic investigations on a 741-cm long core (HU2008-029-016PC) raised from the deep central Baffin Bay, near ODP site 645. Two major difficulties were encountered: (1) the high-frequency occurrence of rapidly deposited layers related to short ice sheet margin events (e.g., ice surges), and (2) the magnetic grain size variability. Physical and magnetic mineralogical properties were used to screen out unreliable magnetic sediment layers. The obtained relative paleointensity (RPI) proxy matches reference paleomagnetic stacks and regional records. Moreover, the resulting record depicts two major excursions which were assigned to the Laschamp and the Norwegian-Greenland-Sea events. It has thus been possible to derive a robust 115 ka chronology for the cored sequence. We concluded that even under such a dynamic sedimentary regime, magnetic properties of the sediments can provide a reliable chronostratigraphy, together with information on sedimentary processes.

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“…The detrital carbonate that characterizes the DC-(lithofacies A) sediments could originate from: i) distal sedimentation from an ice stream source located in Hudson Strait and on the adjacent shelf, ii) ice flowing out of Cumberland Sound and eroding the Paleozoic outlier on the shelf off Cumberland Sound (MacLean, 1985), or iii) far travelled detrital carbonate carried by icebergs and suspended sediment from the Paleozoic Basins of NW Greenland and the High Canadian Arctic (Aksu, 1981;Krank, 1966;Marlowe, 1966). In Baffin Bay, the latter source is characterized by a high fraction of dolomite (Andrews, 1993;Andrews et al, 1989).…”

Section: Depositional Processes -Sources and Environmentsmentioning

confidence: 99%

Late Quaternary stratigraphy, chronology, and depositional processes on the slope of S.E. Baffin Island, detrital carbonate and Heinrich events: Implications for onshore glacial history

Andrews¹,

Kirby²,

Jennings³

et al. 2002

gpq

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AbstractIn order to describe ice sheet/ocean interactions at the NE margin of the Laurentide Ice Sheet over 40 radiocarbon dates have been obtained on foraminifera from nine, 2.5 to 11 m piston cores from the slope of SE Baffin Island. The cores were collected off Cumberland Sound and north of Hudson Straitfrom 750 to 1 510 m waterdepth. Rates of sediment accumulation varied between 20 and 40 cm/ky. Six cores contain high-resolution records of events during Marine Isotope Stage (MIS) 2 and parts of 1 and 3, whereas three cores have core top dates of ≥30 ka and thus provide information on MIS 3 and possibly 4/5. The cores include three main facies: Lithofacies A - yellowish/buff detrital carbonate-rich sediment, also referred to as Detrital Carbonate (DC-) events; Lithofacies B - olive-green detrital carbonate-poor sediment; and Lithofacies C - a black sedimentary unit. The lithofacies represent changes in glacial sources, ice sheet proximity, and processes of deposition. We conclude that there are DC- events correlative with Heinrich events H-1, H- 2, and H-4 in the North Atlantic; however, we find no compelling evidence for a DC-layer during H-3 (ca. 27 ± ka). There are three to four distinct DC- events after H-4 (ca.35 ± ka) but their exact ages are difficult to determine. Grain-size spectra and X-radiographs show that the DC-sediments are stratified to massive silty-clays with little sand, but generally have higher sand percentages at the base. DC-layers were deposited in part from turbidity currents, melting of icebergs, and rain-out of fine-grained silts and clays. In contrast, ice distal sediments in the eastern North Atlantic recorded H-events as an abrupt increase in ice rafted sand-size particles. In our study area, H-layer thicknesses vary from 0 and 70 cm for H-1 and 20 to 90 cm for H-2; H-4 is ≥60 to 100 cm thick. Over the total length of our records, the sedimentary conditions have been dominated by hemipelagic deposition (lithofacies B), implying that those times when ice reached the shelf (lithofacies A and C) have been short.

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Mineralogy as an Indicator of Long-Term Current Fluctuations in Baffin Bay

Cited by 19 publications

References 2 publications

Holocene chronostratigraphy of northeastern Baffin Bay based on radiocarbon and palaeomagnetic data

Holocene chronostratigraphy of northeastern Baffin Bay based on radiocarbon and palaeomagnetic data

Late Quaternary chronostratigraphic framework of deep Baffin Bay glaciomarine sediments from high‐resolution paleomagnetic data

Late Quaternary stratigraphy, chronology, and depositional processes on the slope of S.E. Baffin Island, detrital carbonate and Heinrich events: Implications for onshore glacial history

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