The magnetic fabric and depositional environments of loess deposits
The magnetic fabric and depositional environments of loess deposits
The method of defining the bulk sedimentary fabric by equating it with the magnetic fabric (the anisotropy of magnetic susceptibility) has been to yield reliable, well-defined results for moderately to strongly magnetic samples. Highly weathered horizons occurring within fresh sediment can be identified by results which are not sufficiently precise to define an ordered grain fabric.
Two end-member styles of magnetic fabric have been observed in the results of measurements on long, continuous sections of terrestrial silt. These styles are sufficiently different to enable the distinction between various modes of formation not immediately apparent from the bulk sedi-mentology.
The sedimcntological characteristics of the silts have been used to confirm the primary evidence from the magnetic fabric for the origins of the deposits. It is, therefore, postulated that the first, constrained, style of magnetic fabric represents subaqueous deposition from a moving body of water, whilst the second, more random, style represents deposition from a succession of dust-falls, ie. the fabric of a primary aeolian loess.
University of Southampton
Butcher, Geoffrey David Hamilton
1990
Butcher, Geoffrey David Hamilton
Butcher, Geoffrey David Hamilton
(1990)
The magnetic fabric and depositional environments of loess deposits.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The method of defining the bulk sedimentary fabric by equating it with the magnetic fabric (the anisotropy of magnetic susceptibility) has been to yield reliable, well-defined results for moderately to strongly magnetic samples. Highly weathered horizons occurring within fresh sediment can be identified by results which are not sufficiently precise to define an ordered grain fabric.
Two end-member styles of magnetic fabric have been observed in the results of measurements on long, continuous sections of terrestrial silt. These styles are sufficiently different to enable the distinction between various modes of formation not immediately apparent from the bulk sedi-mentology.
The sedimcntological characteristics of the silts have been used to confirm the primary evidence from the magnetic fabric for the origins of the deposits. It is, therefore, postulated that the first, constrained, style of magnetic fabric represents subaqueous deposition from a moving body of water, whilst the second, more random, style represents deposition from a succession of dust-falls, ie. the fabric of a primary aeolian loess.
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Published date: 1990
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Local EPrints ID: 460382
URI: http://eprints.soton.ac.uk/id/eprint/460382
PURE UUID: b94dde5f-edcd-4273-bc92-da86f6f96ce1
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Date deposited: 04 Jul 2022 18:21
Last modified: 04 Jul 2022 18:21
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Author:
Geoffrey David Hamilton Butcher
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