(Table DR1) Argon isotope data and dating for individual >63 µm amphibole grains from Labrador Sea sediments, ODP Hole 105-647A

Variations of global and regional silicate weathering rates and paleo-ocean circulation patterns are estimated by using radiogenic isotope records, but the effects of changes in provenance are generally ignored. Here sediment provenance has been constrained through the use of Ar-Ar ages for individu...

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Bibliographic Details
Main Authors: Reynolds, Ben C, Sherlock, Sarah C, Kelley, Simon P, Burton, Kevin W
Format: Dataset
Language:English
Published: PANGAEA 2004
Subjects:
105-647A
AGE
dated
dated standard deviation
Argon-36/Argon-39
standard deviation
Argon-37/Argon-39
Argon-38/Argon-39
Argon-39
Argon-40
Argon-40/Argon-39
Calculated
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Infrared laser ablation microprobe (IRLAMP)
Joides Resolution
Leg105
Method comment
North Atlantic Ocean
Number
Ocean Drilling Program
ODP
Sample code/label
Labrador Sea
North Atlantic Deep Water
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.713697
https://doi.org/10.1594/PANGAEA.713697
Description
Summary:Variations of global and regional silicate weathering rates and paleo-ocean circulation patterns are estimated by using radiogenic isotope records, but the effects of changes in provenance are generally ignored. Here sediment provenance has been constrained through the use of Ar-Ar ages for individual detrital minerals from the Labrador Sea, which can be compared directly to the radiogenic isotope compositions from the same core material. Dramatic changes in the radiogenic isotope composition of North Atlantic Deep Water through the Quaternary Period are shown to reflect discrete changes in both sources and weathering processes accompanying Northern Hemisphere glaciation. Changes in the different radiogenic isotope systems reflect the influence of source, physical weathering, and chemical weathering, and not simply changes in the underlying weathering rate or ocean circulation patterns that are typically inferred.

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