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Holocene environmental reconstruction of sediment-source linkages at Crummock Water, English Lake District, based on magnetic measurements

Holocene environmental reconstruction of sediment-source linkages at Crummock Water, English Lake District, based on magnetic measurements
Holocene environmental reconstruction of sediment-source linkages at Crummock Water, English Lake District, based on magnetic measurements
To reconstruct Lateglacial and Holocene environmental changes in the British uplands, two c. 5.8 m long sediment cores from Crummock Water (NW England), together with several hundred soil samples from the Crummock Water catchment, were studied using magnetic techniques. Optically stimulated luminescence (OSL) dating using fine silt quartz and 14C dating of terrestrial plant macrofossils were used to establish a chronology for the lake sediments. A good agreement between optical and 14C ages indicates first, that the OSL dating method can be used to date lake sediments in the British Isles; second that macrofossil-based 14C dating can be used to avoid the problem of `old carbon' error associated with bulk sample 14C dating of lake sediments and third, that the established chronology is robust. The lake sediment magnetic properties indicate a series of changes in sediment composition during the Holocene, which correlate well with sediment lithology, water content and weight-loss-on-ignition. The first change corresponds to the Lateglacial/Postglacial climatic shift at around 11400 years ago; the subsequent suite of changes corresponds to a probable regional onset of human activity at 2000 BC, and particularly to the intensification of human activity at around AD 900. A comparison of the lake sediment magnetic properties and those of the catchment soils shows a clear linkage for the Lateglacial period, and for the period after AD 900. In contrast, detailed magnetic measurements of the early- through mid-Holocene sediments suggest that their magnetic properties are dominated by bacterial magnetosomes.
lake sediments, OSL dating, 14C dating, mineral magnetic measurements, sediment sources, bacterial magnetosomes, English lake district, crummock water, Holocene
0959-6836
129-140
Shen, Zhixiong
133eaf54-a5b6-4c6a-bb73-5cfea91f181e
Bloemendal, Jan
3d2ebd07-b0f9-4665-8238-3ab30b5d53a9
Mauz, Barbara
89821dbe-a7cd-4050-8def-baea286dae0e
Chiverrell, Richard C.
193e87d2-aae0-499c-b92b-af07eb2a494d
Dearing, John A.
dff37300-b8a6-4406-ad84-89aa01de03d7
Lang, Andreas
d4303581-0fa8-49f7-af61-0d27b7dc8d01
Liu, Qingsong
fbaf8851-e943-4ece-91f5-c5f30306dff1
Shen, Zhixiong
133eaf54-a5b6-4c6a-bb73-5cfea91f181e
Bloemendal, Jan
3d2ebd07-b0f9-4665-8238-3ab30b5d53a9
Mauz, Barbara
89821dbe-a7cd-4050-8def-baea286dae0e
Chiverrell, Richard C.
193e87d2-aae0-499c-b92b-af07eb2a494d
Dearing, John A.
dff37300-b8a6-4406-ad84-89aa01de03d7
Lang, Andreas
d4303581-0fa8-49f7-af61-0d27b7dc8d01
Liu, Qingsong
fbaf8851-e943-4ece-91f5-c5f30306dff1

Shen, Zhixiong, Bloemendal, Jan, Mauz, Barbara, Chiverrell, Richard C., Dearing, John A., Lang, Andreas and Liu, Qingsong (2008) Holocene environmental reconstruction of sediment-source linkages at Crummock Water, English Lake District, based on magnetic measurements. The Holocene, 18 (1), 129-140. (doi:10.1177/0959683607085604).

Record type: Article

Abstract

To reconstruct Lateglacial and Holocene environmental changes in the British uplands, two c. 5.8 m long sediment cores from Crummock Water (NW England), together with several hundred soil samples from the Crummock Water catchment, were studied using magnetic techniques. Optically stimulated luminescence (OSL) dating using fine silt quartz and 14C dating of terrestrial plant macrofossils were used to establish a chronology for the lake sediments. A good agreement between optical and 14C ages indicates first, that the OSL dating method can be used to date lake sediments in the British Isles; second that macrofossil-based 14C dating can be used to avoid the problem of `old carbon' error associated with bulk sample 14C dating of lake sediments and third, that the established chronology is robust. The lake sediment magnetic properties indicate a series of changes in sediment composition during the Holocene, which correlate well with sediment lithology, water content and weight-loss-on-ignition. The first change corresponds to the Lateglacial/Postglacial climatic shift at around 11400 years ago; the subsequent suite of changes corresponds to a probable regional onset of human activity at 2000 BC, and particularly to the intensification of human activity at around AD 900. A comparison of the lake sediment magnetic properties and those of the catchment soils shows a clear linkage for the Lateglacial period, and for the period after AD 900. In contrast, detailed magnetic measurements of the early- through mid-Holocene sediments suggest that their magnetic properties are dominated by bacterial magnetosomes.

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More information

Published date: 2008
Keywords: lake sediments, OSL dating, 14C dating, mineral magnetic measurements, sediment sources, bacterial magnetosomes, English lake district, crummock water, Holocene

Identifiers

Local EPrints ID: 55724
URI: https://eprints.soton.ac.uk/id/eprint/55724
ISSN: 0959-6836
PURE UUID: 575fd517-f24b-417e-995c-e9ebac5bf0db
ORCID for John A. Dearing: ORCID iD orcid.org/0000-0002-1466-9640

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Date deposited: 05 Aug 2008
Last modified: 14 Mar 2019 01:43

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Contributors

Author: Zhixiong Shen
Author: Jan Bloemendal
Author: Barbara Mauz
Author: Richard C. Chiverrell
Author: John A. Dearing ORCID iD
Author: Andreas Lang
Author: Qingsong Liu

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