Tracking the provenance of Greenland-sourced, Holocene aged, individual sand-sized ice-rafted debris using the Pb-isotope compositions of feldspars and 40Ar/39Ar ages of hornblendes

The provenance of sand-sized ice-rafted debris (IRD) sourced from Greenland is currently difficult to determine. Such knowledge, if it could be ascertained with a high degree of certainty, could be applied to the Greenland-proximal marine records to improve both our understanding of modern-day spati...

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Veröffentlicht in:Earth and planetary science letters 2016-01, Vol.433, p.192-203
Hauptverfasser: White, Lee F., Bailey, Ian, Foster, Gavin L., Allen, Georgina, Kelley, Simon P., Andrews, John T., Hogan, Kelly, Dowdeswell, Julian A., Storey, Craig D.
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container_end_page 203
container_issue
container_start_page 192
container_title Earth and planetary science letters
container_volume 433
creator White, Lee F.
Bailey, Ian
Foster, Gavin L.
Allen, Georgina
Kelley, Simon P.
Andrews, John T.
Hogan, Kelly
Dowdeswell, Julian A.
Storey, Craig D.
description The provenance of sand-sized ice-rafted debris (IRD) sourced from Greenland is currently difficult to determine. Such knowledge, if it could be ascertained with a high degree of certainty, could be applied to the Greenland-proximal marine records to improve both our understanding of modern-day spatial patterns of iceberg rafting and the past history of the Greenland Ice Sheet (GIS). Recent studies have highlighted the utility of the Pb-isotope composition of individual sand-sized feldspars and the 40Ar/39Ar ages of individual sand-sized hornblendes in this regard. However, before any such provenance toolkit can be applied to the palaeo-record, it is necessary first to determine whether this approach can be used to track the sources of known recent Greenland-proximal IRD deposition. To this end we present new records of the Pb-isotope composition and the 40Ar/39Ar ages of individual sand-sized grains of feldspars and hornblendes, respectively, from modern Greenland glacifluvial and fjord sands and Holocene to modern Greenland-proximal marine sediments. These new data demonstrate that sand-sized feldspars and hornblendes glacially eroded by the GIS exhibit distinct intra- and inter-tectonic terrane differences in their Pb-isotope compositions and ages and that these differences are clearly expressed in the geochemistry and geochronology of sand-sized IRD deposited in marine sediments around Greenland. Although overlap exists between some Greenland-proximal IRD ‘source fields’ defined by these data, our approach has the potential to both better understand spatial patterns of Greenland-derived IRD in the modern day as well as during past episodes of iceberg calving. •We measure feldspar Pb-isotopes and date hornblende in Greenland river sands.•We use these data to determine spatial variation in Holocene IRD provenance.•We demonstrate how our approach can be used to reconstruct ice-margin histories.
doi_str_mv 10.1016/j.epsl.2015.10.054
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source Elsevier ScienceDirect Journals Complete
subjects Age
Ar–Ar
Deposition
Feldspars
Greenland
ice rafted debris
Icebergs
Lead (metal)
Marine
Pb isotopes
provenance
Sediments
Tracking
title Tracking the provenance of Greenland-sourced, Holocene aged, individual sand-sized ice-rafted debris using the Pb-isotope compositions of feldspars and 40Ar/39Ar ages of hornblendes
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