A Holocene palaeomagnetic secular variation record from Huguangyan maar Lake, southern China
A Holocene palaeomagnetic secular variation record from Huguangyan maar Lake, southern China
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DOI：
10.1111/j.1365-246x.2012.05475.x
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发表时间：
2012-07
影响因子：
2.8
通讯作者：
Xiaoqiang Yang;Qingsong Liu;Zongqi Duan;Zhihua Su;G. Wei;G. Jia;T. Ouyang;Youliang Su;Luhua Xie-Lu
中科院分区：
文献类型：
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作者：
Xiaoqiang Yang;Qingsong Liu;Zongqi Duan;Zhihua Su;G. Wei;G. Jia;T. Ouyang;Youliang Su;Luhua Xie-Lu
总结
通过放射性碳测年和基于磁化率的相关性的约束，从中国南方湖光岩玛阿尔湖水深100 m处采集的三个利文斯通活塞岩芯中获得了长105 m的复合全新世沉积剖面。均匀的粉质粘土表明稳定连续的沉积。在伪单畴粒度范围内，主要的磁性载体是磁铁矿，因此适合于记录古地磁长期变化（PSV）。结果表明，HGY PSV曲线与区域尺度上的对应曲线具有较好的相关性。因此，PSV数据是一个潜在的工具，地层对比和进一步细化中国南方湖泊沉积物序列的时间框架。进一步比较HGY PSV记录与同时代的欧洲和北美的同行证实了存在强永久磁通瓣的核幔边界。不同区域记录之间的振幅和异相模式的差异可能归因于磁通瓣的演化。
SUMMARY
A composite Holocene sediment profile ∼5 m in length, constrained by both radiocarbon dating and magnetic susceptibility based correlation, was obtained from three Livingstone piston cores collected in ∼10-m water depth in the Huguangyan (HGY) maar lake, southern China. The homogeneous silty clay indicates stable and continuous deposition. The dominant magnetic carrier is magnetite in the pseudo-single-domain grain size range and thus is suitable for recording palaeomagnetic secular variations (PSV). Results show that the HGY PSV curves can be correlated faithfully to the counterparts at a regional scale. Therefore, the PSV data is a potential tool for stratigraphic correlation and for further refining the chronological framework of lake sediment sequences from Southern China. Further comparison of the HGY PSV records with the coeval European and North American counterparts confirms the existence of strong permanent magnetic flux lobes at the core–mantle boundary. The discrepancy in amplitude and out-phase pattern among the different regional records may be ascribed to the evolution of the magnetic flux lobes.