Citation:

PANGAEA.992698 (dataset in review)

Name: Ice-rafted debris (IRD) and mass-accumulation rates of lithic grains from IODP Site 383-U1542
License: https://creativecommons.org/licenses/by/4.0/
Keywords: IODP; IRD; Mass accumulation rate; n-alkanes; Patagonian Ice Sheet

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Abstract:

Here we use counts of ice-rafted debris (IRD counts) mass-accumulation rates (MAR) (counts/cm²/ka), in combination with mass-accumulation rates of terrigenous leaf wax biomarkers synthesized by land plants (long chain n-alkanesMAR; mg/m²/a) from the Chilean margin which provide us information on past extent of the Patagonian ice-sheet over the past 790 000 years.

IRD counts are presented as the concentration of lithic grains, defined as the number of grains with diameters greater than ~0.5 mm. IRD was defined as the total number of lithogenic/terrigenous grains in the carbonate‐free fraction. Processed X-ray images were used to estimate IRD abundance per X- ray image. Each image integrates 12 cm of core, and IRD concentration was obtained for the central depth of the image. Mass accumulation rate (MAR) was calculated by multiplying the concentration of the compounds (ng/g sed.), by the Dry bulk density (DBD) (g/cm³), and the sedimentation rate (m/ka).

Keyword(s):

IODP; IRD; Mass accumulation rate; n-alkanes; Patagonian Ice Sheet

Related to:

Rigalleau, Vincent; Arz, Helge Wolfgang; Beech, Nathan; Hagemann, Julia R; Ruggieri, Nicoletta; Wegwerth, Antje; Sadatzki, Henrik; Illing, Matthew; Moy, Christopher M; Winckler, Gisela; Lamy, Frank (accepted): Oceanic forcing of Patagonian Ice Sheet variability over the last eight glacial cycles. Communications Earth & Environment

Coverage:

Latitude: -52.704860 * Longitude: -75.596150

Date/Time Start: 2019-07-03T23:30:00 * Date/Time End: 2019-07-08T09:00:00

Minimum DEPTH, sediment/rock: 0.130 m * Maximum DEPTH, sediment/rock: 247.905 m

Event(s):

383-U1542 * Latitude: -52.704860 * Longitude: -75.596150 * Date/Time Start: 2019-07-03T23:30:00 * Date/Time End: 2019-07-08T09:00:00 * Elevation: -1101.0 m * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Rigalleau, Vincent	IODP Depth Scale Terminology	Geocode – CCSF-383-U1542-ABCD-20190710
2	AGE	Age	ka BP	Rigalleau, Vincent		Geocode
3	Sedimentation rate	SR	cm/ka	Rigalleau, Vincent	Calculated, see abstract
4	Density, dry bulk	DBD	g/cm³	Rigalleau, Vincent	Calculated, see abstract
5	Accumulation rate, mass	MAR	g/cm²/ka	Rigalleau, Vincent	Calculated, see abstract
6	Grains	Grains	#	Rigalleau, Vincent	Counted	>500 µm fraction on processed X-ray images
7	Ice rafted debris, flux	IRD flux	#/cm²/ka	Rigalleau, Vincent	Calculated, see abstract

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

3695 data points

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