Elemental Compositions of the "Wushan Loess": Implications for Origin and Sediment Source
-
摘要: 为了探讨“巫山黄土”的成因及物源，对剖面73个样品进行了常量元素测试和分析，并与已知典型的黄土剖面的元素地球化学特征进行了比较．结果表明：（1）“巫山黄土”主要化学成分以SiO2、Al2O3和TFe2O3(TFe2O3=Fe2O3+FeO)为主，三者的平均含量之和为84.84%，与上部陆壳(UCC)（86.2%）、洛川黄土（85.34%）、镇江下蜀土（86.76%）均非常接近。（2）“巫山黄土”常量元素质量百分含量与洛川、甘孜黄土和西风红黏土的均比较接近，显示了具有相同或相近的沉积环境和类型。（3）“巫山黄土”的TiO2/Al2O3—K2O/Al2O3的数据点主要分布区域与镇江下蜀土与川西的甘孜黄土大致相同，经UCC 标准化后的“巫山黄土”分布曲线与其它风成黄土也显示了较好的相似性，从而说明“巫山黄土”具有风积成因的特点。（4）元素比值分析显示“巫山黄土”与甘孜黄土、洛川黄土均十分相近，在Mg/Mn、Al/Mg、Fe/K方面与甘孜黄土更为接近，而在Mg/Ca 、Si/Al方面与洛川黄土更为一致，可能与两处黄土同源。
-
关键词:
- &ldquo /
- 巫山黄土&rdquo /
- 元素地球化学特征 /
- 成因和物源分析
Abstract: 73 samples from the typical section of the "Wushan Loess" were analyzed for elemental compositions in order to obtain information about its origin and sediment source. Elemental analysis show that the major elements of the "Wushan Loess" contain SiO2, Al2O3 and TFe2O3(Fe2O3+FeO), average concentration of those is 84.8%. It is similar as the UCC (86.2%), Luochuan Loess (85.34%) and Zhenjiang Xiashu Loess (86.76%). Elemental compositions of the "Wushan Loess" were similar as the Luochuan Loess, Ganzi Loess and Xifeng Red Clay, indicating the similar sediment environment. TiO2/Al2O3 vs. K2O/Al2O3 diagram shows that the "Wushan Loess" and the Ganzi Loess had almost the same elemental compositions. Besides the UCC-normalized patterns were also similar, indicating the aeolian origin. Elemental ratios show that the "Wushan Loess" were derived from multi-provenances. Besides, the "Wushan Loess" were reworked by fluvial process.-
Key words:
- " /
- Wushan loess" /
- elemental compositions
-
点击查看大图
计量
- 文章访问数: 1602
- HTML全文浏览量: 9
- PDF下载量: 775
- 被引次数: 0
下载:
