Magnetic properties of sediments of the Red River: Effect of sorting on the source-to-sink pathway and its implications for environmental reconstruction

Thi Thu Hien Nguyen, Weiguo Zhang, Zhen Li, Jie Li, Can Ge, Jinyan Liu, Xuexin Bai, Huan Feng, Lizhong Yu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We conducted a mineral magnetic study of river bank and subaqueous delta sediments from the Red River, in order to examine the role of sedimentary sorting on the variation of sedimentary magnetic properties from source to sink. The magnetic mineralogy mainly consists of magnetite and hematite. Bulk sediment particle-size variations have a strong influence on magnetic properties, with the frequently used magnetic parameters χfd%, χARM, χARM/χ, and χARM/SIRM exhibiting positive correlations with the <4 μm fraction, while S-ratios are negatively correlated with this fraction. Compared with river bank sediments and shallow shoreface (<5 m water depth) sediments, sediments from the deeper (>5 m water depth) part of the subaqueous delta have lower χ and SIRM values, a finer ferrimagnetic grain-size and higher proportions of hematite, consistent with selective loss of coarse ferrimagnetic grains on the source-to-sink pathway. We suggest that variations in magnetic properties in response to particle-size compositions and therefore depositional environment changes should be carefully addressed when magnetic proxies such as χARM/SIRM are used in the study of coastal and marine environmental changes (e.g., sea-level change). In such cases, the combined use of magnetic properties and geochemical indicators, such as Al/Ti ratio, may provide better results for paleoenvironmental reconstruction.

Original languageEnglish
Pages (from-to)270-281
Number of pages12
JournalGeochemistry, Geophysics, Geosystems
Volume17
Issue number2
DOIs
StatePublished - 1 Feb 2016

Fingerprint

magnetic property
classifying
sinks
Sorting
sorting
rivers
Magnetic properties
Sediments
sediments
Rivers
magnetic properties
hematite
river
sediment
Particle size
particle size
Ferrosoferric Oxide
Banks (bodies of water)
Mineralogy
river bank

Keywords

  • Red River
  • hematite
  • magnetic properties
  • magnetite
  • particle-size
  • sorting

Cite this

Nguyen, Thi Thu Hien ; Zhang, Weiguo ; Li, Zhen ; Li, Jie ; Ge, Can ; Liu, Jinyan ; Bai, Xuexin ; Feng, Huan ; Yu, Lizhong. / Magnetic properties of sediments of the Red River : Effect of sorting on the source-to-sink pathway and its implications for environmental reconstruction. In: Geochemistry, Geophysics, Geosystems. 2016 ; Vol. 17, No. 2. pp. 270-281.
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Magnetic properties of sediments of the Red River : Effect of sorting on the source-to-sink pathway and its implications for environmental reconstruction. / Nguyen, Thi Thu Hien; Zhang, Weiguo; Li, Zhen; Li, Jie; Ge, Can; Liu, Jinyan; Bai, Xuexin; Feng, Huan; Yu, Lizhong.

In: Geochemistry, Geophysics, Geosystems, Vol. 17, No. 2, 01.02.2016, p. 270-281.

Research output: Contribution to journalArticle

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T2 - Effect of sorting on the source-to-sink pathway and its implications for environmental reconstruction

AU - Nguyen, Thi Thu Hien

AU - Zhang, Weiguo

AU - Li, Zhen

AU - Li, Jie

AU - Ge, Can

AU - Liu, Jinyan

AU - Bai, Xuexin

AU - Feng, Huan

AU - Yu, Lizhong

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N2 - We conducted a mineral magnetic study of river bank and subaqueous delta sediments from the Red River, in order to examine the role of sedimentary sorting on the variation of sedimentary magnetic properties from source to sink. The magnetic mineralogy mainly consists of magnetite and hematite. Bulk sediment particle-size variations have a strong influence on magnetic properties, with the frequently used magnetic parameters χfd%, χARM, χARM/χ, and χARM/SIRM exhibiting positive correlations with the <4 μm fraction, while S-ratios are negatively correlated with this fraction. Compared with river bank sediments and shallow shoreface (<5 m water depth) sediments, sediments from the deeper (>5 m water depth) part of the subaqueous delta have lower χ and SIRM values, a finer ferrimagnetic grain-size and higher proportions of hematite, consistent with selective loss of coarse ferrimagnetic grains on the source-to-sink pathway. We suggest that variations in magnetic properties in response to particle-size compositions and therefore depositional environment changes should be carefully addressed when magnetic proxies such as χARM/SIRM are used in the study of coastal and marine environmental changes (e.g., sea-level change). In such cases, the combined use of magnetic properties and geochemical indicators, such as Al/Ti ratio, may provide better results for paleoenvironmental reconstruction.

AB - We conducted a mineral magnetic study of river bank and subaqueous delta sediments from the Red River, in order to examine the role of sedimentary sorting on the variation of sedimentary magnetic properties from source to sink. The magnetic mineralogy mainly consists of magnetite and hematite. Bulk sediment particle-size variations have a strong influence on magnetic properties, with the frequently used magnetic parameters χfd%, χARM, χARM/χ, and χARM/SIRM exhibiting positive correlations with the <4 μm fraction, while S-ratios are negatively correlated with this fraction. Compared with river bank sediments and shallow shoreface (<5 m water depth) sediments, sediments from the deeper (>5 m water depth) part of the subaqueous delta have lower χ and SIRM values, a finer ferrimagnetic grain-size and higher proportions of hematite, consistent with selective loss of coarse ferrimagnetic grains on the source-to-sink pathway. We suggest that variations in magnetic properties in response to particle-size compositions and therefore depositional environment changes should be carefully addressed when magnetic proxies such as χARM/SIRM are used in the study of coastal and marine environmental changes (e.g., sea-level change). In such cases, the combined use of magnetic properties and geochemical indicators, such as Al/Ti ratio, may provide better results for paleoenvironmental reconstruction.

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