宝鸡剖面S5古土壤磁化率变化机制

被引：33

作者：

郭雪莲 ^{[1
]}

刘秀铭 ^{[2
,3
,4
]}

郭晖 ^{[4
]}

陈渠 ^{[4
]}

李平原 ^{[4
]}

马明明 ^{[4
]}

刘植 ^{[4
]}

机构：

[1] 兰州大学地质科学与矿产资源学院

[2] 福建师范大学全球变化研究中心,地理科学学院

[3] Department of Environment and Geography,Macquarie University,Sydney NSW ,Australia

[4] 兰州大学西部环境与气候变化研究院,西部环境教育部重点实验室

来源：

第四纪研究 | 2012年 / 32卷 / 04期

关键词：

S5古土壤; 磁化率; 磁学机制; 宝鸡剖面;

D O I：

暂无

中图分类号：

S152.9 [土壤物理机械性质（土壤力学）];

学科分类号：

090301 [土壤学];

摘要：

运用岩石磁学和地球化学相结合的方法对宝鸡剖面S5和S3古土壤的磁性特征进行了详细对比分析,结果表明S5古土壤层Rb/Sr比值较高,S5古土壤形成期气候温暖湿润,成壤程度比S3时期强。S5层亚铁磁性矿物含量低于S3层,反铁磁性矿物主要为针铁矿;而S3层的反铁磁性矿物主要为赤铁矿。S5层土体表面及土壤空隙中可见大量黑褐色的铁锰胶膜分布,由于沉积后土壤长时期处于偏干或偏湿的氧化、还原交替环境中,细粒的磁铁矿和/或磁赤铁矿、赤铁矿溶解转化成褐铁矿、针铁矿等弱磁性矿物,主要转化成在局域湿润环境下能够稳定存在的针铁矿,这种磁性矿物的转化可能导致了成壤强的S5古土壤超顺磁亚铁磁性矿物含量的减少和磁化率的降低。

引用

页码：785 / 794

页数：10

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