Relative paleointensity of the geomagnetic field during the past 200 ka from the West Philippine Sea and its chronological significance  

作　　者：QingYong Meng  AnChun Li  TieGang Li  FuQing Jiang XiaoJing Zhou 

机构地区：[1] Key Lab of Marine Geology & Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China [2] Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China

出　　处：《Science China Earth Sciences》2009年第8期1115-1126,共12页中国科学（地球科学英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No. 90411014) ;Pilot Project of the Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-YW-211)

摘　　要：Our rock magnetic analysis of core Ph05 from the West Philippine Sea demonstrates that the core preserves a strong, stable remanent magnetization and meets the magnetic mineral criteria for relative paleointensity (RPI) analyses. The magnetic minerals inOur rock magnetic analysis of core Ph05 from the West Philippine Sea demonstrates that the core preserves a strong, stable remanent magnetization and meets the magnetic mineral criteria for relative paleointensity (RPI) analyses. The magnetic minerals in the sequence are dominated by pseudosingle-domain magnetite, and the concentration of magnetic minerals is at the same scale. Both the conventional normalizing method and the pseudo-Thellier method were used in conjunction with the examination of the rock magnetic properties and natural remanent magnetization. Susceptibility (χ), anhysteretic remnant magnetization (ARM) and saturation isothermal remnant magnetization (SIRM) were used as the natural remanent magnetization normalizer. However, coherence analysis indicated that only ARM is more suitable for paleointensity reconstruction. The age model of core is established based on oxygen isotope data and AMS14C data, which is consistent with the age model estimated from RPI records. The relative paleointensity data provide a continuous record of the intensity variation during the last 200 ka, which correlates well with the global references RPI stacks. Several prominent low paleointensity values are identified and are correlated to the main RPI minima in the SINT-200 record, suggesting that the sediments have recorded the real changes of geomagnetic field.

关 键 词：WEST Philippine Sea relative PALEOINTENSITY GEOMAGNETIC field 

分 类 号：P318[天文地球—固体地球物理学]