Geomagnetic paleointensity dating of South China Sea sediments for the last 130 kyr

Relative paleointensity records from the northern South China Sea, northwest Pacific Ocean were studied in two gravity piston cores. Continuous mineral magnetic and paleomagnetic measurements were made using discrete sediment samples. Detailed rock magnetic parameters, such as thermomagnetic and hig...

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Bibliographic Details
Published in:Earth and Planetary Science Letters
Main Authors: Yang Xiaoqiang, Friedrich Heller, Wu Nengyou, Yang Jie, Su Zhihua
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
South China Sea
Relative Paleointensity
Chronology
Science & Technology
Physical Sciences
Geochemistry & Geophysics
INTER-HEMISPHERIC CORRELATION
NORTH-ATLANTIC
LATE PLEISTOCENE
LOESS PLATEAU
LABRADOR-SEA
SULU SEA
300 KA
RECORD
INTENSITY
Labrador Sea
North Atlantic
Online Access:http://ir.giec.ac.cn/handle/344007/3310
http://www.sciencedirect.com/science/journal/0012821X
https://doi.org/10.1016/j.epsl.2009.04.035
Description
Summary:Relative paleointensity records from the northern South China Sea, northwest Pacific Ocean were studied in two gravity piston cores. Continuous mineral magnetic and paleomagnetic measurements were made using discrete sediment samples. Detailed rock magnetic parameters, such as thermomagnetic and high-field hysteresis data, indicate that pseudo-single domain magnetite in a narrow range of grain-size and concentration is the main contributor to the remanent magnetization. The uniform magnetic mineralogy meets the commonly accepted criteria for establishing relative paleointensity records. The relative paleointensity (RPI) curves were constructed by normalizing the natural remanent magnetization (NRM) with isothermal remanent magnetization (IRM), both in the 20-60 mT demagnetization state. Dating constraints have been provided by radiocarbon ages in the upper 400 cm of both cores. Furthermore, we have correlated our paleointensity records with NAPIS-75, S.Atlantic-1089, Sint-200 and NOPAPIS-250 to determine the chronological RPI framework for the South China Sea (SCS-PIS). Although some temporal offsets of paleointensity features between the different records have been recognized, their similar shape suggests that relative paleointensity on the 10(3)-10(4) year scale is globally coherent and can provide an age framework for sediments independent of delta(18)O ages. (C) 2009 Elsevier B.V. All rights reserved.

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