Biomarker determination as a provenance tool for detrital carbonate events (Heinrich events?)

Fingerprinting Quaternary glacial sources into Baffin Bay

John Parnell, Stephen Alan Bowden, John T. Andrews, Colin William Taylor

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Sedimentary deposits associated with Heinrich events are anomalously rich in detrital carbonate. Off Hudson Strait the dominant carbonate is calcite whereas at distal sites in the North Atlantic dolomite is dominant (more diagnostic?). A significant source for dolomite is its outcrop at the northern end of Baffin Bay where major ice streams from the Laurentide, Innuitian and Greenland ice sheets converged. The provenance of samples containing detrital carbonate, mainly dolomite, from a core in Baffin Bay has been confirmed using organic geochemistry to distinguish between alternative sources, based upon the thermal maturity of organic matter in carbonates of the source region. The core contained five distinct carbonate units dating between similar to 14 and 51 cal ka BP and indicates significant ice stream instability associated with iceberg calving and significant volumes of meltwater. The exact temporal relationship to Heinrich events is not yet clear. A long mid-Wisconsin interval (similar to 38 to 22 cal ka BP) devoid of detrital carbonate suggests a major reduction in ice extent at high northern latitudes. The core samples yield thermally sensitive biomarker ratios comparable to those from Laurentian carbonates in the Canadian Arctic islands but unlike those from North Greenland, identifying the former region as their provenance. However, a Late Holocene sample from off Newfoundland shows a stronger affinity with Greenland. (c) 2007 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)71-82
Number of pages12
JournalEarth and Planetary Science Letters
Volume257
Issue number1-2
Early online date16 Feb 2007
DOIs
Publication statusPublished - 15 May 2007

Keywords

  • Quaternary
  • Heinrich layers
  • Baffin Bay
  • detrital carbonates
  • biomarker
  • Canada
  • Greenland
  • SCHEI point group
  • North-Atlantic
  • Labrador sea
  • ice-sheet
  • clay-size
  • organic geochemistry
  • hornblende grains
  • AR-40/AR-39 ages
  • Sverdrup basin
  • Arctic Canada

Cite this

@article{28b56c00808e443bad1d1752ce1a8afa,
title = "Biomarker determination as a provenance tool for detrital carbonate events (Heinrich events?): Fingerprinting Quaternary glacial sources into Baffin Bay",
abstract = "Sedimentary deposits associated with Heinrich events are anomalously rich in detrital carbonate. Off Hudson Strait the dominant carbonate is calcite whereas at distal sites in the North Atlantic dolomite is dominant (more diagnostic?). A significant source for dolomite is its outcrop at the northern end of Baffin Bay where major ice streams from the Laurentide, Innuitian and Greenland ice sheets converged. The provenance of samples containing detrital carbonate, mainly dolomite, from a core in Baffin Bay has been confirmed using organic geochemistry to distinguish between alternative sources, based upon the thermal maturity of organic matter in carbonates of the source region. The core contained five distinct carbonate units dating between similar to 14 and 51 cal ka BP and indicates significant ice stream instability associated with iceberg calving and significant volumes of meltwater. The exact temporal relationship to Heinrich events is not yet clear. A long mid-Wisconsin interval (similar to 38 to 22 cal ka BP) devoid of detrital carbonate suggests a major reduction in ice extent at high northern latitudes. The core samples yield thermally sensitive biomarker ratios comparable to those from Laurentian carbonates in the Canadian Arctic islands but unlike those from North Greenland, identifying the former region as their provenance. However, a Late Holocene sample from off Newfoundland shows a stronger affinity with Greenland. (c) 2007 Elsevier B.V. All rights reserved.",
keywords = "Quaternary, Heinrich layers, Baffin Bay, detrital carbonates, biomarker, Canada, Greenland, SCHEI point group, North-Atlantic, Labrador sea, ice-sheet, clay-size, organic geochemistry, hornblende grains, AR-40/AR-39 ages, Sverdrup basin, Arctic Canada",
author = "John Parnell and Bowden, {Stephen Alan} and Andrews, {John T.} and Taylor, {Colin William}",
year = "2007",
month = "5",
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language = "English",
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pages = "71--82",
journal = "Earth and Planetary Science Letters",
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publisher = "ELSEVIER SCIENCE BV",
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TY - JOUR

T1 - Biomarker determination as a provenance tool for detrital carbonate events (Heinrich events?)

T2 - Fingerprinting Quaternary glacial sources into Baffin Bay

AU - Parnell, John

AU - Bowden, Stephen Alan

AU - Andrews, John T.

AU - Taylor, Colin William

PY - 2007/5/15

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N2 - Sedimentary deposits associated with Heinrich events are anomalously rich in detrital carbonate. Off Hudson Strait the dominant carbonate is calcite whereas at distal sites in the North Atlantic dolomite is dominant (more diagnostic?). A significant source for dolomite is its outcrop at the northern end of Baffin Bay where major ice streams from the Laurentide, Innuitian and Greenland ice sheets converged. The provenance of samples containing detrital carbonate, mainly dolomite, from a core in Baffin Bay has been confirmed using organic geochemistry to distinguish between alternative sources, based upon the thermal maturity of organic matter in carbonates of the source region. The core contained five distinct carbonate units dating between similar to 14 and 51 cal ka BP and indicates significant ice stream instability associated with iceberg calving and significant volumes of meltwater. The exact temporal relationship to Heinrich events is not yet clear. A long mid-Wisconsin interval (similar to 38 to 22 cal ka BP) devoid of detrital carbonate suggests a major reduction in ice extent at high northern latitudes. The core samples yield thermally sensitive biomarker ratios comparable to those from Laurentian carbonates in the Canadian Arctic islands but unlike those from North Greenland, identifying the former region as their provenance. However, a Late Holocene sample from off Newfoundland shows a stronger affinity with Greenland. (c) 2007 Elsevier B.V. All rights reserved.

AB - Sedimentary deposits associated with Heinrich events are anomalously rich in detrital carbonate. Off Hudson Strait the dominant carbonate is calcite whereas at distal sites in the North Atlantic dolomite is dominant (more diagnostic?). A significant source for dolomite is its outcrop at the northern end of Baffin Bay where major ice streams from the Laurentide, Innuitian and Greenland ice sheets converged. The provenance of samples containing detrital carbonate, mainly dolomite, from a core in Baffin Bay has been confirmed using organic geochemistry to distinguish between alternative sources, based upon the thermal maturity of organic matter in carbonates of the source region. The core contained five distinct carbonate units dating between similar to 14 and 51 cal ka BP and indicates significant ice stream instability associated with iceberg calving and significant volumes of meltwater. The exact temporal relationship to Heinrich events is not yet clear. A long mid-Wisconsin interval (similar to 38 to 22 cal ka BP) devoid of detrital carbonate suggests a major reduction in ice extent at high northern latitudes. The core samples yield thermally sensitive biomarker ratios comparable to those from Laurentian carbonates in the Canadian Arctic islands but unlike those from North Greenland, identifying the former region as their provenance. However, a Late Holocene sample from off Newfoundland shows a stronger affinity with Greenland. (c) 2007 Elsevier B.V. All rights reserved.

KW - Quaternary

KW - Heinrich layers

KW - Baffin Bay

KW - detrital carbonates

KW - biomarker

KW - Canada

KW - Greenland

KW - SCHEI point group

KW - North-Atlantic

KW - Labrador sea

KW - ice-sheet

KW - clay-size

KW - organic geochemistry

KW - hornblende grains

KW - AR-40/AR-39 ages

KW - Sverdrup basin

KW - Arctic Canada

U2 - 10.1016/j.epsl.2007.02.021

DO - 10.1016/j.epsl.2007.02.021

M3 - Article

VL - 257

SP - 71

EP - 82

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

IS - 1-2

ER -