(Table 2) Age determination of brock-red sandy mud beds and detrital carbonate beds in the Scotian margin

• Main Authors: Piper, David J W, Skene, Kenneth I
• Format: Dataset
• Language: English
• Published: PANGAEA 2016
• Subjects: Age; 14C AMS; comment; dated; dated material; dated standard deviation; Area/locality; BIO73011-1; BIO73031-7; BIO78005-77; BIO82004-11; BIO82004-2; BIO82004-4; BIO82004-7; BIO85044-3; BIO86013-02; BIO86018-12; BIO86034-16TWC; BIO86034-36; BIO86034-41; BIO87003-7; BIO87008-15; BIO87008-6; BIO90002-1; BIO90015-19; BIO90015-22; CALYPSO; Calypso Corer; Depth; bottom/max; sediment/rock; top/min; Elevation of event; Event label; IMAGES I; Laboratory code/label; Latitude of event; Longitude of event; Marion Dufresne (1995); MD101; MD952031; MD95-2031; Narwhal; North Atlantic Ocean; Labrador Sea; narwhal*; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.862951; https://doi.org/10.1594/PANGAEA.862951

Piston cores from the continental margin off Nova Scotia show up to four discrete intervals of "brick-red sandy mud", which are up to 20 cm thick. The ages of these intervals are bracketed by several radiocarbon dates, and three fall in the range 12.5-14.1 ka (radiocarbon years with -0.4 kyr reservoir correction). The youngest dates from ~10.4 ka, placing it within the Younger Dryas. The distribution of the beds and their petrographic character indicate a source in the Gulf of Saint Lawrence. The grain size of these beds suggests that they comprise a coarse component transported by ice rafting that diminishes distally and a fine component that represents suspension fallout from a surface plume and resulting nepheloid layers. Graded brick-red beds in some cores were probably redeposited from turbidity currents. The lowermost bed on the Laurentian Fan and East Scotian Rise is immediately overlain by a carbonate-rich interval that can be identified all around the margin of the Grand Banks. This interval is correlated with detrital carbonate bed DC-1 in the Labrador Sea and Heinrich event H1 in the North Atlantic. The sequential occurrence of the two beds suggests that they may be a response to the same trigger, probably sea level rise, but that the Gulf of Saint Lawrence source was more easily destabilized.