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

Geomagnetic paleointensity dating of South China Sea sediments for the last 130 kyr
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南海沉积物近130 kyr地磁古强度测年

DOI:
10.1016/j.epsl.2009.04.035
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发表时间:
2009-06
影响因子:
5.3
通讯作者:
Yang Jie
Yang Jie
中科院分区:
地球科学1区
文献类型:
--
作者:
Yang Xiaoqiang;Wu Nengyou;Friedrich Heller;Su Zhihua;Yang Jie

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在两个重力活塞芯中研究了南中国海北部、西北太平洋的相对古强度记录。利用离散的沉积物样品进行了连续的矿物磁学和古地磁测量。详细的岩石磁学参数,如热磁和高场磁滞数据表明,在很小的粒度和浓度范围内的伪单畴磁铁矿是剩余磁化的主要贡献者。均匀磁性矿物学符合建立相对古强度记录的普遍接受标准。将自然剩余磁化强度(NRM)与等温剩余磁化强度(IRM)进行归一化处理,建立了相对古强度(RPI)曲线,两者均处于20-60 Mt退磁状态。两个岩心上部400厘米的放射性碳年龄提供了测年限制。此外,我们将我们的古强度记录与NAPIS-75、南大西洋1089、SINT-200和NOPAPIS-250进行了对比,以确定南中国海的年代学RPI格架(SCS-PIS)。尽管已经认识到不同记录之间古强度特征的一些时间偏差,但它们相似的形状表明,103104年尺度上的相对古强度是全球一致的,可以提供一个独立于δ18O年龄的沉积物年龄框架。
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 103–104year scale is globally coherent and can provide an age framework for sediments independent of δ18O ages.
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