Magnetic mineral dissolution recorded in a lacustrine sequence from the Heqing Basin, SW China, and its relationship with changes in the Indian monsoon

The dissolution of magnetic oxides is an important process in many lake environments. Understanding this phenomenon is crucial for the paleoenvironmental interpretation of the magnetic properties of lake sediments. In order to reveal its effects on sedimentary magnetic properties, and to assess the...

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Bibliographic Details
Published in:Journal of Asian Earth Sciences
Main Authors: Xu, Xinwen, Qiang, Xiaoke, Zhao, Hui, Fu, Chaofeng
Format: Report
Language:English
Published: PERGAMON-ELSEVIER SCIENCE LTD 2020
Subjects:
Lacustrine sediments
The Heqing basin
Rock magnetism
Magnetic mineral dissolution
Indian Summer Monsoon
Indian Ocean Dipole
CLIMATE VARIABILITY
SUMMER-MONSOON
LOESS PLATEAU
LAKE BAIKAL
MARINE-SEDIMENTS
ARABIAN SEA
IRON-OXIDES
SUSCEPTIBILITY
GREIGITE
OXIDATION
Geology
Geosciences
Multidisciplinary
Antarctic
Indian
Antarc*
Online Access:http://ir.ieecas.cn/handle/361006/12788
http://ir.ieecas.cn/handle/361006/12789
https://doi.org/10.1016/j.jseaes.2019.104081
Description
Summary:The dissolution of magnetic oxides is an important process in many lake environments. Understanding this phenomenon is crucial for the paleoenvironmental interpretation of the magnetic properties of lake sediments. In order to reveal its effects on sedimentary magnetic properties, and to assess the possible associated paleoenvironmental implications, we carried out detailed rock magnetic analyses of the selected samples from a 920-kyr lacustrine sequence from the Heqing Basin, SW China. The results indicate that the sedimentary magnetic properties are controlled by the concentration and grain size of magnetite and maghemite. High magnetic susceptibility (chi) intervals contain more fine-grained magnetite and maghemite, while low chi intervals contain only minor amounts of residual magnetite. The decreased content of fine-grained maghemite from high chi to low chi intervals reflects the dissolution of magnetic oxides during deposition. Intervals affected by strong magnetic dissolution have a high TOC content and correspond to times of high Antarctic temperatures, suggesting that magnetic mineral dissolution intensity was associated with variations in the strength of the Indian Summer Monsoon (ISM). Notably, the ISM is sensitive to Southern Hemisphere warming. Weak magnetic dissolution indicates a dry climate occurred since similar to 320 kyr in the Heqing Basin. This dry/cool event was widespread across the Eastern Bay of Bengal, Equatorial Indian Ocean and Northern Australia, and was linked to a strengthened Indian Ocean Dipole (IOD). Since the moisture source of the Heqing Basin was mainly from the above regions, we infer that the influence of the IOD extended northwards to SW China.

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