MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS

XU Xinwen; QIANG Xiaoke; AN Zhisheng; LI Xubin; LI Peng; SUN Yufang

Volume 16 Issue 4

Dec. 2010

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XU Xinwen, QIANG Xiaoke, AN Zhisheng, et al., 2010. MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS. Journal of Geomechanics, 16 (4): 372-382.

Citation:

XU Xinwen, QIANG Xiaoke, AN Zhisheng, et al., 2010. MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS. Journal of Geomechanics, 16 (4): 372-382.

Citation:

XU Xinwen, QIANG Xiaoke, AN Zhisheng, et al., 2010. MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS. Journal of Geomechanics, 16 (4): 372-382.

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MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS

XU Xinwen^{1, 2
,},
QIANG Xiaoke¹,
AN Zhisheng¹,
LI Xubin^{1, 2},
LI Peng^{1, 2},
SUN Yufang^{1, 2}

1.
State Key Laboratory and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Science, Xi'an 710075, China
2.
Graduated University of Chinese Academy of Sciense, Beijing 100049, China

More Information

Received: 2009-01-04
Published: 2010-12-01

Abstract

Abstract

Located in southwestern China, the Heqing Basin received continuous lacustrine sediments of great thickness, which could be an excellent continental record for Indian monsoon. In this study, we choose the lake sediments from Heqing drill core to analyze the paleoenvironmental significance of magnetic susceptibility. By analyzing the magnetic susceptibility in combination with the response of carbonate content, Loss on Ignition (LOI), and grain size to paleoenvironmental changes, we get some useful information:1) magnetic susceptibility increase when carbonate and LOI decrease; 2) magnetic susceptibility increase with increase of < 4μm grains in lacustrine clayey sediments, and with increase of middle grain size in sections containing sands and pebbles. Based on comparison between these proxies, we conclude that magnetic minerals got into the lake mainly together with clay-sized terrestrial detritus, and magnetic susceptibility is related to the vegetation cover and rainfall in the watershed and therefore could be considered to be a good indicator for monsoon-induced erosion around lake catchments. In the warm-humid interglacial periods, due to well-developed vegetation cover in the catchment area, erosion is relatively weak and clay-sized terrestrial detritus transported into the lake are reduced, so sediments have low concentration of magnetic minerals and low magnetic susceptibility. In the cold-arid glacial periods, however, because of the vegetation development is restricted, erosion is relatively strong and more clay-sized sediments are transported into the lake, the sediments have high concentration of magnetic minerals and high magnetic susceptibility.
- Heqing basin,
- magnetic susceptibility,
- paleoenvironmental implications

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References(43)

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