CAJ | 학술논문

近二十年来中国黄土环境磁学的研究基本上是沿着两条主线进行的,即磁性地层学和古气候研究两个方面.对早先确定的典型黄土剖面的磁性地层研究表明风成黄土的堆积开始于Matuyama的下界,约2.6 Ma.而近年来对黄土-古土壤序列之下的红粘土的进一步研究显示风成堆积的开始比原先认为的要早的多,至少可追溯到约7 Ma.尽管目前在古土壤磁化率的增强机制和磁化率如何记录古气候变化等问题上还没有达成广泛的一致,而黄土-古土壤系列磁化率与深海氧同位素的良好对比可证实中国黄土确是记录全球气候变化非常理想的信息载体.近年来许多学者尝试性提出的其它古气候替代性指标,如全岩粒度、稳定同位素组成、FeD/FeT指标、Rb/Sr比值和CaCO3含量等必将为重建古季风变化和古气候提供重要信息.
근이십년래중국황토배경자학적연구기본상시연착량조주선진행적,즉자성지층학화고기후연구량개방면.대조선학정적전형황토부면적자성지층연구표명풍성황토적퇴적개시우Matuyama적하계,약2.6 Ma.이근년래대황토-고토양서렬지하적홍점토적진일보연구현시풍성퇴적적개시비원선인위적요조적다,지소가추소도약7 Ma.진관목전재고토양자화솔적증강궤제화자화솔여하기록고기후변화등문제상환몰유체성엄범적일치,이황토-고토양계렬자화솔여심해양동위소적량호대비가증실중국황토학시기록전구기후변화비상이상적신식재체.근년래허다학자상시성제출적기타고기후체대성지표,여전암립도、은정동위소조성、FeD/FeT지표、Rb/Sr비치화CaCO3함량등필장위중건고계풍변화화고기후제공중요신식.
Over the last two decades two broad lines of enquiry have emerged from magnetic investigation of Chinese Loess Plateau (CLP): magnetostratigraphy and paleoclimate. The classic loess sections cross CLP indicate that wind-blown loess deposition began close to the base of Matuyama (2.6 Ma). However, progress is also being made in extending the record down below the loess of the CLP into the so-called Red Clay, so that the aeolian record can now be carried back beyond 7 Ma. Excellent connection between marine oxygen isotope curves and low-field susceptibility from numerous loess-paleosol sequences provides impressive evidence of the global significance of the Chinese record. Whereas the actual mechanism by which magnetic susceptibility becomes a climate proxy remains controversial. Presently several other proxy indicators, such as grain size, stable isotope composition, CaCO3 content, ratio of citrate-bicarbonate-dithionite (CBD)-extractable Fe2O3 to total Fe2O3, Rb/Sr and others have been proposed to reflect and reconstruct long-term monsoon changes.