地理学报 ›› 2017, Vol. 72 ›› Issue (2): 279-291.doi: 10.11821/dlxb201702008
毛沛妮(), 庞奖励(
), 黄春长, 查小春, 周亚利, 郭永强, 胡慧, 刘涛
收稿日期:
2016-06-17
修回日期:
2016-10-12
出版日期:
2017-02-15
发布日期:
2017-02-15
作者简介:
作者简介:毛沛妮(1989-), 女, 山西运城人, 博士生, 研究方向为资源开发与环境演变。E-mail:
基金资助:
Peini MAO(), Jiangli PANG(
), Chunchang HUANG, Xiaochun ZHA, Yali ZHOU, Yongqiang GUO, Hui HU, Tao LIU
Received:
2016-06-17
Revised:
2016-10-12
Published:
2017-02-15
Online:
2017-02-15
Supported by:
摘要:
本文对汉江上游黄土的常量元素含量及相关地球化学参数CIA、Na/K、淋溶系数、退碱系数、残积系数等进行了系统分析。结果显示:① 汉江黄土的主要化学成分为SiO2、Al2O3和Fe2O3,三者含量总和达767.3 g/kg;常量元素含量大小排序为SiO2>Al2O3>Fe2O3>K2O>MgO>Na2O>CaO。风化成壤过程中Na、Ca、Mg、Si发生不同程度的迁移淋溶,而Fe、Al、K相对富集。② 其风化成壤强度呈现从马兰黄土L1→过渡性黄土Lt→古土壤S0逐渐升高、全新世黄土L0又降低的规律,记录了该区域气候经历了末次冰期(55.0-15.0 ka BP)冷干、早全新世(15.0-8.5 ka BP)增温增湿、中全新世(8.5-3.1 ka BP)达到最暖湿,晚全新世(3.1-0.0 ka BP)降温变干的演变过程。③ 汉江黄土与洛川、巫山、下蜀黄土的元素组合特征高度一致,不同地区常量元素(CaO除外)含量十分接近且UCC标准化值变幅均小于0.25,这暗示了它们风化之初具有相似的风成沉积基础;但不同区域黄土的化学风化强度差异明显,大致呈现洛川黄土<汉江黄土<巫山黄土<下蜀黄土的趋势,与中国现代季风气候的空间变化规律相吻合,即不同地区黄土风化程度差异主要是东亚季风变化影响的结果。
毛沛妮, 庞奖励, 黄春长, 查小春, 周亚利, 郭永强, 胡慧, 刘涛. 汉江上游黄土常量元素地球化学特征及区域对比[J]. 地理学报, 2017, 72(2): 279-291.
Peini MAO, Jiangli PANG, Chunchang HUANG, Xiaochun ZHA, Yali ZHOU, Yongqiang GUO, Hui HU, Tao LIU. Chemical weathering characteristics and regional comparative study of the loess deposits in the upper Hanjiang River[J]. Acta Geographica Sinica, 2017, 72(2): 279-291.
表1
汉江上游黄土剖面地层特征
地层 | 年代 (ka BP) | 黄土剖面特征描述 | ||
---|---|---|---|---|
QFC剖面 | MTS剖面 | HPC剖面 | ||
表土 (TS) | 1.5-0.0 | 35~0 cm,浊棕(5YR7/4,干态),黏土—粉砂质地,团粒结构,疏松多孔,多植物根系。 | 60~0 cm,浊棕(7.5YR5/4,干态),黏土—粉砂质地,团粒结构,疏松多孔,多植物根系。 | 50~0 cm,浊黄棕(10YR5/3,干态),黏土—粉砂质地,团粒结构,疏松多孔,植物根系发育。 |
全新世黄土(L0) | 3.1-1.5 | 110~35 cm,浊黄橙(7.5YR5/4,干态),粉砂质地,块状或团块状结构。顶部有汉代灰色绳纹薄陶片。 | 130~60 cm,浊黄橙(10YR6/4,干态),粉砂质地,块状 结构。 | 100~50 cm,浊黄橙(10YR6/4,干态),粉砂质地,块状结构,下部有周代灰色陶片和烧土块。 |
古土壤 (S0) | 8.5-3.1 | 260~110 cm,浊红棕(5.5YR3/4,干态),黏土-粉砂质地,棱块状结构,致密坚硬,大量亮红棕色黏土胶膜淀积,结构体内仍呈红棕色,且含有少量铁锰结核(< 0.2mm)。 | 270~130 cm,暗棕(7.5YR3/4,干态),黏土—粉砂质地,棱块状结构,致密坚硬,大量亮红棕色黏土胶膜淀积,结构体内仍呈红棕色。 | 270~100 cm,暗棕(7.5YR3/4,干态),黏土—粉砂质地,棱块状结构,致密坚硬,大量亮红棕色黏土胶膜淀积,结构体内仍呈红棕色。 |
过渡性黄土(Lt) | 11.5-8.5 | 320~260 cm,浊黄橙(7.5YR5/4,干态),粉砂质地,块状结构,裂隙面有少量暗棕色黏土胶膜淀积。 | 350~270 cm,浊黄橙(10YR7/4,干态),粉砂质地,块状结构,裂隙面有少量棕色黏土胶膜沉淀。 | 310~270 cm,浊黄橙(10YR5/4,干态),粉砂质地,块状结构,裂隙面有少量棕色黏土胶膜沉淀。 |
马兰黄土(L1) | 55.0-11.5 | 660~320 cm,浊黄橙(7.5YR5/4,干态),粉砂质地,均匀的块状结构。其中660~480 cm混夹有少量不规则薄层砂。 | 1140~350 cm,浊黄橙(10YR7/3,干态),粉砂质地,均匀的块状结构。其中1140~590 cm混夹少量不规则薄层砂。 | 790~310 cm,浊黄橙(10YR7/3,干态),粉砂质地,块状结构。 |
河流相沉积(T1-al) | 典型的河流相二元结构,上部为十分疏松、干净的粗砂,下部为磨圆度很高的砾石层。 |
表2
汉江上游黄土常量元素含量(g/kg)
地层 | SiO2 | Al2O3 | Fe2O3 | K2O | CaO | Na2O | MgO | |
---|---|---|---|---|---|---|---|---|
汉 江 上 游 黄 土 | TS | 472.2~648.2① | 111.2~151.0 | 54.0~66.7 | 24.2~28.1 | 7.4~12.2 | 9.2~18.3 | 16.0~19.6 |
567.9② | 136.4 | 61.9 | 26.4 | 9.4 | 12.3 | 17.6 | ||
L0 | 464.7~701.5 | 105.8~150.0 | 44.8~62.6 | 23.7~28.2 | 7.4~10.4 | 9.4~21.9 | 14.2~19.5 | |
592.2 | 127.0 | 54.7 | 25.1 | 8.7 | 14.1 | 16.4 | ||
S0 | 472.4~652.7 | 109.5~153.8 | 56.1~65.7 | 23.5~29.7 | 7.4~10.7 | 9.8~20.7 | 16.3~20.8 | |
568.6 | 137.8 | 62.4 | 26.5 | 8.6 | 12.9 | 18.2 | ||
Lt | 480.8~653.7 | 112.5~152. | 53.5~62.3 | 23.6~29.6 | 7.5~9.6 | 9.7~18.4 | 18.1~20.2 | |
570.0 | 136.0 | 60.3 | 26.1 | 8.7 | 13.1 | 19.0 | ||
L1 | 479.2~642.8 | 102.9~151.4 | 52.7~65.2 | 22.3~29.5 | 7.7~11.4 | 9.7~25.5 | 16.8~22.3 | |
570.1 | 133.1 | 57.8 | 26.3 | 9.5 | 15.0 | 19.8 | ||
整体均值 | 464.7~701.5 | 102.9~153.8 | 44.8~66.7 | 22.3~28.2 | 7.4~12.2 | 9.2~25.5 | 14.2~22.3 | |
573.8 | 134.1 | 59.4 | 26.1 | 9.0 | 13.5 | 18.2 | ||
CV | 0.02 | 0.04 | 0.07 | 0.03 | 0.16 | 0.18 | 0.10 | |
洛川黄土[ | 575.7 | 119.0 | 48.0 | 20.8 | 77.3 | 14.9 | 20.6 | |
巫山黄土[ | 662.0 | 133.5 | 52.9 | 23.2 | 36.6 | 12.3 | 16.0 | |
下蜀黄土[ | 680.7 | 133.2 | 53.0 | 23.5 | 10.0 | 9.2 | 16.1 | |
UCC[ | 660.0 | 152.0 | 50.0 | 34.0 | 39.0 | 42.0 | 22.0 |
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