邙山黄土古土壤S<sub>2</sub>沉积以来的微量和稀土元素地球化学特征及其物源指示意义

陈立业; 张珂; 傅建利; 梁浩; 李肖杨; 李忠云

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邙山黄土古土壤S₂沉积以来的微量和稀土元素地球化学特征及其物源指示意义

论文 | 更新时间：2023-12-11

- 邙山黄土古土壤S₂沉积以来的微量和稀土元素地球化学特征及其物源指示意义
- The trace and rare earth element characteristics of Mangshan Loess since deposit of paleosol S₂ and its implications for provenance
- 中山大学学报(自然科学版)(中英文) 2018年57卷第3期页码：14-23
- 作者机构：
  
  1. 中山大学地球科学与工程学院∥广东省地质过程与矿产资源探查重点实验室,广东,广州,510275
  2. 
- 作者简介：
- 基金信息：
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  中图分类号：
- 纸质出版日期：2018，
  
  网络出版日期：2018-5-25，
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陈立业, 张珂, 傅建利, 等. 邙山黄土古土壤S₂沉积以来的微量和稀土元素地球化学特征及其物源指示意义[J]. 中山大学学报(自然科学版)(中英文), 2018,57(3):14-23.

CHEN Liye, ZHANG Ke, FU Jianli, et al. The trace and rare earth element characteristics of Mangshan Loess since deposit of paleosol S₂ and its implications for provenance[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2018,57(3):14-23.
陈立业, 张珂, 傅建利, 等. 邙山黄土古土壤S₂沉积以来的微量和稀土元素地球化学特征及其物源指示意义[J]. 中山大学学报(自然科学版)(中英文), 2018,57(3):14-23. DOI：

CHEN Liye, ZHANG Ke, FU Jianli, et al. The trace and rare earth element characteristics of Mangshan Loess since deposit of paleosol S₂ and its implications for provenance[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2018,57(3):14-23. DOI：

摘要

地处黄河三门峡段下游冲积平原附近的邙山黄土，中更新世晚期以来沉积厚度近100 m，远大于洛川、渭南等典型黄土剖面的同期堆积。前人从沉积速率、粒度等方面进行研究，推测邙山黄土堆积可能源于三门峡段下游的冲积物，但尚无微量和稀土元素地球化学方面的证据。对黄土中古土壤S

沉积以来的邙山黄土及三门峡地区黄土进行了微量元素和稀土元素测试，并与黄土高原、淮南等地区典型黄土的元素地球化学特征进行了对比。结果表明，与黄土高原等典型黄土相比，邙山黄土明显富Zr、Hf贫Th、Cs，在Zr/Hf、Nb/Th、Y/Th、La/Th等元素比值上差异显著；La-Th-Sc和Th-Sc-Zr/10三角图解也显示，邙山黄土与黄土高原等典型黄土的投影区域明显不同。在稀土元素特征上，邙山黄土在ΣREE及表征REE内部分馏程度的LREE/HREE、La/Eu上与黄土高原等典型黄土存在明显不同，10*HfCe-Yb和La-Zr/10-Ce三角图解中的投影区域也与其他典型黄土有显著区别。微量元素及稀土元素地球化学特征显示，邙山黄土与黄土高原等典型黄土的物源可能并不完全一致，邙山黄土可能相当一部分源于近源冲积物。邙山附近广阔的黄河冲积平原可能是S2以来邙山黄土巨厚堆积的重要物源区。

Abstract

The Mangshan(MS) loess is located on the south bank of the Yellow River near the southwestern part of the North China Plain

well outside of the Chinese Loess Plateau (CLP). Stratigraphically

the uppermost～100 m loesspaleosol sequence

formed in the last two climate cycles

is extremely thick compared with the eolian deposits in the CLP. Previous researches revealed that

unlike other sections in the CLP

the MS loess since deposit of S

(about 200 ka) is characterized by exceptionally high accumulation rates

lower magnetic susceptibility values and coarser grainsize distribution. The Yellow River flood plain adjacent to the MS loess is considered as the dominant source of the accumulated loess

but the proof in geochemistry is absent. The trace element (TE) and rare earth element (REE) characteristics of the MS loess bear information about climate change

and may give insight into the dust sources. We present the loess comparison of TE and REE compositions in MS

Sanmenxia (SMX

i.e.

the Sanmen Gorge) area

CLP and Huainan(HN) since deposit of S

. The results show substantial differences in Zr/Hf

Nb/Th

Y/Th and La/Th values when compared the MS loess with the SMX

CLP and HN loess

leading to an important indicator for provenance. Specifically

the MS loess shows a higher Zr

Hf and a lower Th

implying a coarser grainsize distribution. The difference in TE composition between the MS loess and the other eolian deposits is also shown in the ternary diagrams of La-Th-Sc and Zr/10-Th-Sc

in which the MS loess projection region is incompletely consistent with that of the SMX

CLP and HN loess. Most probably

these were all derived from the difference of dust sources. The REE study of the MS loess and its comparison with the loess of SMX

CLP and HN show a lower ΣREE

LREE/HREE and La/Eu value. The MS loess samples exhibit an exceptionally distinctive projection region in the ternary diagrams of 10*Hf-Ce-Yb and La-Zr/10-Ce. Both of them are reasonably classified as another provenance. All results present that the dust source of the MS loess may be disparate from that of SMX

CLP and HN

implying that the alluvial fan adjacent to MS may contribute significantly to the accumulation of the MS loess-palaeosol sequences since deposit of S

. The Yellow River flowed out through the Sanmenxia in about 200 ka

releasing most of its suspended load due to a dramatic decrease in gradient and forming an excessive deposition of the alluvial fan. Such excessive deposit compensation provided a major source for the MS loess accumulation.

关键词

邙山黄土微量元素稀土元素地球化学物源

Keywords

Mangshan loesstrace elementrare earth elementgeochemistryprovenance

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邙山黄土古土壤S2沉积以来的微量和稀土元素地球化学特征及其物源指示意义

The trace and rare earth element characteristics of Mangshan Loess since deposit of paleosol S2 and its implications for provenance

DOI：

摘要

Abstract

关键词

Keywords

references

邙山黄土古土壤S₂沉积以来的微量和稀土元素地球化学特征及其物源指示意义

The trace and rare earth element characteristics of Mangshan Loess since deposit of paleosol S₂ and its implications for provenance