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Provenance of North Atlantic ice-rafted debris during the last deglaciation: a new application of U-Pb rutile and zircon geochronology

Research output: Contribution to journalArticle

DOI

Standard

Provenance of North Atlantic ice-rafted debris during the last deglaciation : a new application of U-Pb rutile and zircon geochronology. / Small, David Patrick; Parrish, Randall R.; Austin, William E. N.; Cawood, Peter A.; Rinterknecht, Vincent.

In: Geology, Vol. 41, No. 2, 02.2013, p. 155-158.

Research output: Contribution to journalArticle

Harvard

Small, DP, Parrish, RR, Austin, WEN, Cawood, PA & Rinterknecht, V 2013, 'Provenance of North Atlantic ice-rafted debris during the last deglaciation: a new application of U-Pb rutile and zircon geochronology' Geology, vol. 41, no. 2, pp. 155-158. https://doi.org/10.1130/G33594.1

APA

Small, D. P., Parrish, R. R., Austin, W. E. N., Cawood, P. A., & Rinterknecht, V. (2013). Provenance of North Atlantic ice-rafted debris during the last deglaciation: a new application of U-Pb rutile and zircon geochronology. Geology, 41(2), 155-158. https://doi.org/10.1130/G33594.1

Vancouver

Small DP, Parrish RR, Austin WEN, Cawood PA, Rinterknecht V. Provenance of North Atlantic ice-rafted debris during the last deglaciation: a new application of U-Pb rutile and zircon geochronology. Geology. 2013 Feb;41(2):155-158. https://doi.org/10.1130/G33594.1

Author

Small, David Patrick ; Parrish, Randall R. ; Austin, William E. N. ; Cawood, Peter A. ; Rinterknecht, Vincent. / Provenance of North Atlantic ice-rafted debris during the last deglaciation : a new application of U-Pb rutile and zircon geochronology. In: Geology. 2013 ; Vol. 41, No. 2. pp. 155-158.

Bibtex - Download

@article{48450b23a3694f20aa3fcbf79f464550,
title = "Provenance of North Atlantic ice-rafted debris during the last deglaciation: a new application of U-Pb rutile and zircon geochronology",
abstract = "Understanding the provenance of ice-rafted debris (IRD) provides a means to link the behavior of individual ice sheets to proxy records of climate change. Here we present a new approach to determining IRD provenance using U-Pb geochronology of detrital minerals rutile and zircon. We characterize potential source regions from Scotland using detrital rutile from modern fluvial systems, and demonstrate that their unimodal rutile U-Pb ages reflect the timing of the last amphibolite facies metamorphism of the source rocks, imparting a distinctive source signature. Contrasts between these spectra and the bimodal IRD (ca. 470 Ma and ca. 1800-2000 Ma) rutile age signatures rule out Scotland as the sole source and suggest a Laurentian contribution; IRD zircon ages further support this view. U-Pb mineral dating has the potential to provide new insight on IRD provenance, because it allows linkage between IRD and individual source terranes based on their differing magmatic and tectonothermal histories. The occurrence of Laurentian-sourced IRD proximal to Scotland demonstrates widespread and rapid dispersal of debris across the subpolar North Atlantic during the Older Dryas cold oscillation, and implicates the Atlantic meridional overturning circulation as a control. This highlights the sensitivity of some IRD records to rapid climate change during the last deglaciation and supports the interpretation of Heinrich events as time-parallel marker horizons.",
keywords = "INDIVIDUAL HORNBLENDE GRAINS, ICEBERG DISCHARGES, AR-40/AR-39 AGES, MARGIN, EVOLUTION, SCOTLAND, CANADA, CALEDONIDES, GLACIATION, SEDIMENTS",
author = "Small, {David Patrick} and Parrish, {Randall R.} and Austin, {William E. N.} and Cawood, {Peter A.} and Vincent Rinterknecht",
note = "Natural Environment Research Council NIGFSC grant IP-1210-1110 supported the analytical costs of this research.",
year = "2013",
month = "2",
doi = "10.1130/G33594.1",
language = "English",
volume = "41",
pages = "155--158",
journal = "Geology",
issn = "0091-7613",
publisher = "GEOLOGICAL SOC AMER, INC",
number = "2",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Provenance of North Atlantic ice-rafted debris during the last deglaciation

T2 - Geology

AU - Small, David Patrick

AU - Parrish, Randall R.

AU - Austin, William E. N.

AU - Cawood, Peter A.

AU - Rinterknecht, Vincent

N1 - Natural Environment Research Council NIGFSC grant IP-1210-1110 supported the analytical costs of this research.

PY - 2013/2

Y1 - 2013/2

N2 - Understanding the provenance of ice-rafted debris (IRD) provides a means to link the behavior of individual ice sheets to proxy records of climate change. Here we present a new approach to determining IRD provenance using U-Pb geochronology of detrital minerals rutile and zircon. We characterize potential source regions from Scotland using detrital rutile from modern fluvial systems, and demonstrate that their unimodal rutile U-Pb ages reflect the timing of the last amphibolite facies metamorphism of the source rocks, imparting a distinctive source signature. Contrasts between these spectra and the bimodal IRD (ca. 470 Ma and ca. 1800-2000 Ma) rutile age signatures rule out Scotland as the sole source and suggest a Laurentian contribution; IRD zircon ages further support this view. U-Pb mineral dating has the potential to provide new insight on IRD provenance, because it allows linkage between IRD and individual source terranes based on their differing magmatic and tectonothermal histories. The occurrence of Laurentian-sourced IRD proximal to Scotland demonstrates widespread and rapid dispersal of debris across the subpolar North Atlantic during the Older Dryas cold oscillation, and implicates the Atlantic meridional overturning circulation as a control. This highlights the sensitivity of some IRD records to rapid climate change during the last deglaciation and supports the interpretation of Heinrich events as time-parallel marker horizons.

AB - Understanding the provenance of ice-rafted debris (IRD) provides a means to link the behavior of individual ice sheets to proxy records of climate change. Here we present a new approach to determining IRD provenance using U-Pb geochronology of detrital minerals rutile and zircon. We characterize potential source regions from Scotland using detrital rutile from modern fluvial systems, and demonstrate that their unimodal rutile U-Pb ages reflect the timing of the last amphibolite facies metamorphism of the source rocks, imparting a distinctive source signature. Contrasts between these spectra and the bimodal IRD (ca. 470 Ma and ca. 1800-2000 Ma) rutile age signatures rule out Scotland as the sole source and suggest a Laurentian contribution; IRD zircon ages further support this view. U-Pb mineral dating has the potential to provide new insight on IRD provenance, because it allows linkage between IRD and individual source terranes based on their differing magmatic and tectonothermal histories. The occurrence of Laurentian-sourced IRD proximal to Scotland demonstrates widespread and rapid dispersal of debris across the subpolar North Atlantic during the Older Dryas cold oscillation, and implicates the Atlantic meridional overturning circulation as a control. This highlights the sensitivity of some IRD records to rapid climate change during the last deglaciation and supports the interpretation of Heinrich events as time-parallel marker horizons.

KW - INDIVIDUAL HORNBLENDE GRAINS

KW - ICEBERG DISCHARGES

KW - AR-40/AR-39 AGES

KW - MARGIN

KW - EVOLUTION

KW - SCOTLAND

KW - CANADA

KW - CALEDONIDES

KW - GLACIATION

KW - SEDIMENTS

UR - http://geology.gsapubs.org/content/41/2/155

U2 - 10.1130/G33594.1

DO - 10.1130/G33594.1

M3 - Article

VL - 41

SP - 155

EP - 158

JO - Geology

JF - Geology

SN - 0091-7613

IS - 2

ER -

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ID: 42240734