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陇东新近纪红粘土与第四纪黄土地球化学特征及其物源和风化指示意义
Geochemical characteristics of the Tertiary and Quaternary eolian deposits in eastern Gansu province: Implications for provenance and weathering intensity

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綦琳 1,2   乔彦松 1,2,3   刘宗秀 1,2   王燕 1,2   彭莎莎 4  
文摘 甘肃省平凉市灵台县邵寨镇剖面风尘堆积底界年龄大约为5.23 Ma B. P.,通过对该剖面新近纪红粘土与第四纪黄土-古土壤序列的常量元素、微量元素、Nd同位素的测试,分析其在物源和风化方面的指示意义,发现新近纪红粘土与第四纪黄土具有相似的常量、微量元素UCC标准化曲线和稀土元素球粒陨石标准化曲线,指示二者皆来自广阔的物源区,经过了相似的搬运过程,并在搬运中得到充分混合。新近纪红粘土的MgO、Li、Cs、Bi含量较高, Na_2O、稀土元素La-Lu、Y含量较低。风化参数Na_2O/Al_2O_3、化学风化参数CIA以及Al_2O_3-CaO+Na_2O-K_2O (A-CN-K)图,均显示新近纪红粘土比第四纪黄土经历了更为强烈的风化过程。新近纪红粘土的稳定元素比值(TiO_2/Al_2O_3, SiO_2/Al_2O_3, SiO_2/TiO_2, Zr/Hf, Nb/Ta, Lu/Hf, Y/Ho, Th/Nb和Hf/Nb)、稀土元素总量、轻稀土与重稀土的分异程度、轻稀土内部分异程度、重稀土内部分异程度、Ce和Eu的异常程度、同位素εNd (0)值等,皆与第四纪黄土无太大差异,指示二者物质来源一致。粒度以及风化强度的差异,可能是导致新近纪红粘土与第四纪黄土常量和微量元素含量差异的主要原因。
其他语种文摘 An eolian deposit section named Shaozhai, which has been developed since the Tertiary in eastern Gansu province, was analyzed for major-trace elements and Sm-Nd isotopic compositions to explore the relationship for the provenance and weathering intensity between the Tertiary red clay and Quaternary loess. The magnetostratigraphy data indicates that the basal age of the typical eolian deposits is about 5.23 Ma B. P.. We observed both similarities and obvious differences in the Tertiary red clay and Quaternary loess. Specifically, the Tertiary red clay has similar UCC-normalized major-trace element abundances and chondrite-normalized rare earth element abundances as the Quaternary loess, demonstrating that dust materials making up these sediments likely have experienced similar and numerous recycling processes prior to deposition. The Tertiary red clay has relatively high abundances of MgO, Li, Cs, Bi and low abundances of Na_2O, La-Lu, Y. In comparison with the Quaternary loess, chemical weathering parameters such as Na_2O/Al_2O_3, CIA, combined with the A-CN-K diagram suggest that the Tertiary Red clay has experienced a stronger weathering intensity. There is not much difference in the TiO_2/Al_2O_3, SiO_2/Al_2O_3, SiO_2/TiO_2, Zr/Hf, Nb/Ta, Lu/Hf, Y/Ho, Th/Nb, Hf/Nb, total rare earth elements, differentiation degree between the light and heavy rare earth element, internal differentiation degree of the light rare earth element, abnormal degree of Ce and Eu, εNd (0) of the Tertiary red clay and Quaternary loess, demonstrating a similar provenance for them. The finer grain size and stronger weathering of the Tertiary red clay may be responsible for the difference in major and trace element content for the Tertiary red clay and Quaternary loess.
来源 地质力学学报 ,2021,27(3):475-490 【扩展库】
DOI 10.12090/j.issn.1006-6616.2021.27.03.043
关键词 风尘堆积 ; 红粘土 ; 地球化学 ; 物源 ; 黄土高原
地址

1. 中国地质科学院地质力学研究所, 北京, 100081  

2. 新构造运动与地质灾害重点实验室, 北京, 100081  

3. 中国地质调查局新构造与地壳稳定性研究中心, 北京, 100081  

4. 中国科学院广州地球化学研究所, 广东, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 1006-6616
学科 地质学
基金 国家自然科学基金项目
文献收藏号 CSCD:7002640

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引证文献 7 篇

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被引 1 次

2 密静强 广西平果沉积型铝土矿Ga的分布特征与沉积环境关联性探讨 地质力学学报,2022,28(3):417-431
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显示所有7篇文献

论文科学数据集

1. 可可西里盆地风火山群主量元素数据集

2. 华南铀矿床地球化学数据（200 Ma以来）

3. 长江下游成矿带滁州地区白垩纪二长岩及单矿物地球化学数据

数据来源：
国家青藏高原科学数据中心
PlumX Metrics
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