泾河中游将军村全新世剖面中钾素的地球化学特征及古气候意义  

Geochemical characteristics of potassium in Jiangjuncun section of the middle reaches of Jinghe River during the Holocene and its paleoclimatic significance

作　　者：吴利杰[1] 石建省[1] 毕志伟[1] 陈洪云[1] 孙彦敏[1] 郭娇[1] 董秋瑶[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《地球环境学报》2013年第2期1266-1271,共6页Journal of Earth Environment

基　　金：地质科技调查项目(1212010911048;1212011120047);基本科研业务费(sk200915;sk201105)

摘　　要：通过对泾河中游将军村全新世黄土地层中钾素、低频质量磁化率、频率磁化率、Rb/Sr与年代学综合分析,着重探讨了黄土中钾素的地球化学特征及其所揭示的古气候变化。研究表明:(1)速效钾、缓效钾具有很明显的古气候指示意义,可作为衡量东亚夏季风强弱的一种敏感参数或代用指标,并且对微弱的古气侯波动反映更灵敏。(2)近万年来将军村剖面所经历的古气候变化特征:早全新世(11.20—8.05 ka BP)气候逐渐趋于相对暖湿,但气候冷干/暖湿波动频繁交替;中全新世(8.05—3.10 ka BP)气候适宜;晚全新世前期(3.10—2.00 ka BP)气候偏凉干;晚全新世后期(2.00 ka BP—至今)气候再度转为偏暖湿。(3)将军村剖面全新世气候适宜期是渐变形成的,但大暖期却在约3.10 ka BP时以气候突变形式终结。By a comprehensive analysis of K in loess, low mass magnetic susceptibility, frequency dependent magnetic susceptibility, Rb/Sr and chronology in Jiangjuncun section, this research focuses on the discussion of geochemical characteristics of potassium and paleoclimatic significance. It indicates that： （1）available potassium, and slowly available potassium with very significant implications for paleoclimate can be used as a sensitive parameter or substitute index of East Asian monsoon change, which can reflect the weak fluctuations of the climate change. （2） the paleoclimatic change about Jiangjuncun section was that： in the early Holocene （11.20-8.05 ka BP） , the climate gradually tended to be relatively warm and humid, but the dry and cold/warm and humid climate fluctuations took place by turn frequently; during the middle Holocene （8.05-3.10 ka BP） ,the climate was very optimum; at the early stage of late Holocene period （3.10-2. 00 ka BP） the climate was a little cool and dry ; at late stage of late Holocene period （2.00 ka BP-0） , the climate became warm and wet relatively. （3） the Holocene optimum in Jiangjuncun section was gradually formed, but the Holocene Thermal Maximum suddenly ended at 3.10 ka BP by the abrupt climate change.

关 键 词：全钾 无效钾 水溶性钾 交换性钾 非交换性钾 

分 类 号：P534.632[天文地球—第四纪地质学] P532[天文地球—古生物学与地层学]