Citation:

97PA03641

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Abstract:

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.

Related to:

Keigwin, Lloyd D; Jones, Glenn A (1995): The marine record of deglaciation from the continental margin off Nova Scotia. Paleoceanography, 10(6), 973-986, https://doi.org/10.1029/95PA02643

Mosher, David C; Piper, David J W; Vilks, Gustavs; Aksu, Ali E; Fader, Gordon B (1989): Evidence for Wisconsinan glaciations in the Verrill Canyon area, Scotian Slope. Quaternary Research, 31(1), 27-40, https://doi.org/10.1016/0033-5894(89)90083-5

Piper, David J W; Pereira, Christopher PG (1992): Late Quaternary sedimentation in central Flemish Pass. Canadian Journal of Earth Sciences, 29(3), 535-550, https://doi.org/10.1139/e92-047

Coverage:

Median Latitude: 43.671742 * Median Longitude: -57.957392 * South-bound Latitude: 42.319670 * West-bound Longitude: -64.847830 * North-bound Latitude: 47.049170 * East-bound Longitude: -47.048170

Date/Time Start: 1995-06-23T00:00:00 * Date/Time End: 1995-06-23T00:00:00

Minimum DEPTH, sediment/rock: 0.910 m * Maximum DEPTH, sediment/rock: 3.715 m

Event(s):

BIO73011-1 * Latitude: 43.210000 * Longitude: -60.410000 * Elevation: -1814.0 m * Location: South Atlantic Ocean * Method/Device: Piston corer (PC)

BIO73031-7 * Latitude: 42.978330 * Longitude: -55.248330 * Elevation: -4055.0 m * Location: South Atlantic Ocean * Method/Device: Piston corer (PC)

BIO78005-77 * Latitude: 42.895830 * Longitude: -62.175000 * Elevation: -593.0 m * Location: South Atlantic Ocean * Method/Device: Piston corer (PC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Piper, David J W
2	Latitude of event	Latitude		Piper, David J W
3	Longitude of event	Longitude		Piper, David J W
4	Elevation of event	Elevation	m	Piper, David J W
5	DEPTH, sediment/rock	Depth sed	m	Piper, David J W		Geocode
6	Depth, top/min	Depth top	m	Piper, David J W
7	Depth, bottom/max	Depth bot	m	Piper, David J W
8	Area/locality	Area		Piper, David J W
9	Age, dated	Age dated	ka	Piper, David J W	Age, 14C AMS
10	Age, dated standard deviation	Age dated std dev	±	Piper, David J W	Age, 14C AMS
11	Laboratory code/label	Lab label		Piper, David J W
12	Age, dated material	Dated material		Piper, David J W
13	Age, comment	Comm		Piper, David J W		stratigraphic position
14	Reference/source	Reference		Piper, David J W

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

175 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 Depth sed [m]	6 Depth top [m]	7 Depth bot [m]	8 Area	9 Age dated [ka]	10 Age dated std dev [±]	11 Lab label	12 Dated material	13 Comm	14 Reference
BIO90002-1	42.3197	-64.8478	-1117	1.570			LaHave Slope	12.70	0.10	TO-2389	Nuculana paired valves	well above b
BIO90015-22	42.7272	-63.5420	-811	0.910			LaHave Slope	13.70	0.10	TO-2383	Nuculana valve	just above b
BIO90015-19	42.7510	-62.8090	-1060	1.570			Albatross area	12.10	0.10	TO-2084	pelecypod	?above b
BIO90015-19	42.7510	-62.8090	-1060	3.715	3.69	3.74	Albatross area	13.00	0.10	TO-2086	pelecypod fragments	just above DF2
BIO90015-19	42.7510	-62.8090	-1060	1.570			Albatross area	12.95	0.10	TO-2085	planktic foraminifera	just above DF2
BIO86034-36	42.5947	-62.8295	-1591	1.570			Albatross area	13.90	0.10	TO-5071	Macoma sp. Fragments	in DF1
BIO86034-41	42.6547	-63.1047	-1401	1.570			Albatross area	12.90	0.10	ETH-6057	Dentalium	in DF1?
BIO78005-77	42.8958	-62.1750	-593	1.570			Albatross area	10.95	0.10	TO-2453	Dentalium	just above DF1
BIO78005-77	42.8958	-62.1750	-593	1.570			Albatross area	12.60	0.10	TO-2455	Astarte valve	in DF1
BIO82004-2	42.8958	-61.6477	-635	1.570			Verrill Canyon	12.74	0.20	Beta-15242	Propebela turricula	just above b	Mosher et al. (1989)
BIO82004-2	42.8958	-61.6477	-635	1.570			Verrill Canyon	13.75	0.25	Beta-15243	Macoma brevifrons	just above b	Mosher et al. (1989)
BIO82004-2	42.8958	-61.6477	-635	1.570			Verrill Canyon	14.00	0.20	Beta-15244	Astarte undata	just above b	Mosher et al. (1989)
BIO82004-7	42.9638	-61.6317	-570	1.570			Verrill Canyon	10.40	0.10	TO-5077	gastropod fragments	in DF0
BIO82004-4	42.9332	-61.5923	-799	1.570			Verrill Canyon	15.43	0.01	TO-5078	mollusc fragments	in DF2
BIO82004-11	42.8967	-61.8983	-677	1.570			Verrill Canyon	11.90	0.10	TO-5568	Oenopota gastropod	just above DF1
BIO87003-7	43.3450	-60.2150	-920	1.570			South of Sable Island	10.40	0.25	TO-2385	foraminifera	above b
BIO87003-7	43.3450	-60.2150	-920	1.570			South of Sable Island	14.20	0.10	TO-2384	Mya fragments	below d
BIO73011-1	43.2100	-60.4100	-1814	1.570			South of Sable Island	13.30	1.10			just above b	Keigwin and Jones (1995)
BIO73011-1	43.2100	-60.4100	-1814	1.570			South of Sable Island	14.20	0.10			just above d	Keigwin and Jones (1995)
BIO73011-1	43.2100	-60.4100	-1814	1.570			South of Sable Island	15.60	0.14			well below d	Keigwin and Jones (1995)
BIO86034-16TWC	43.8507	-58.3802	-1511	1.570			South of Banquereau	14.75	0.10	ETH-4720	Nuculana paaired valves	below top of T
BIO73031-7	42.9783	-55.2483	-4055	1.570			Laurentian Fan	12.30	0.05			just above d & DC1	Keigwin and Jones (1995)
BIO73031-7	42.9783	-55.2483	-4055	1.570			Laurentian Fan	14.00	0.06			between d and T	Keigwin and Jones (1995)
BIO86013-02	44.3063	-53.7433	-1578	1.570			SW Grand Banks Margin	13.60	0.25	ETH-3001	Nuculana paired valves	just below DC1
MD95-2031	44.3075	-53.7357	-1570	1.570			SW Grand Banks Margin	15.25	0.20	TO-6357	clam shell fragment	just below DC1
BIO87008-6	42.7342	-50.0700	-816	1.570			Tail of the Banks	27.76	0.23	TO-2381	mollusc fragment	just below DC2
BIO85044-3	47.0048	-47.0662	-1012	1.570			Flemish Pass	13.70	0.10	TO-5967	bivalve fragments	near base of DC1
BIO86018-12	47.0163	-47.1530	-933	1.570			Flemish Pass	14.40	0.20	TO-5968	bivalve fragments	just above DC1
BIO87008-15	47.0492	-47.0482	-1071	1.570			Flemish Pass	23.20	0.40	Beta-22233	broken Macoma	just below DC2	Pipe3 and Pereira (1992)