三峡巫山黄土Sr-Nd同位素组成与物源示踪

张玉芬; 李长安; 李启文; 贾明明; 李亚伟

doi:10.3799/dqkx.2019.072

三峡巫山黄土Sr-Nd同位素组成与物源示踪

doi: 10.3799/dqkx.2019.072

1.
中国地质大学地球物理与空间信息学院, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国地质大学流域关键带演化湖北省重点实验室, 湖北武汉 430074

基金项目:

国家自然科学基金项目 41877292

国家自然科学基金项目 41672355

国家自然科学基金项目 41671011

中国地质大学（武汉）“地学长江计划” CUGCJ1801

详细信息

作者简介:
张玉芬(1957-), 女, 教授, 博士生导师, 主要从事环境地质与环境地球物理方面的教学和研究

中图分类号: P595
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出版历程
- 收稿日期: 2019-03-03
- 刊出日期: 2020-03-15

Sr-Nd Isotopic Composition and Provenance Tracing of Wushan Loess, Three Gorges, Yangtze River

1.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 巫山黄土作为中国南方黄土的重要组成部分，弄清该区的物源将为破译这一宝贵沉积记录提供重要的环境信息.对巫山黄土剖面进行了系统取样和Sr-Nd同位素分析，并与黄土高原同期黄土及近源的河流沉积物等进行了比较.结果表明，巫山黄土的⁸⁷Sr/⁸⁶Sr值变化范围为0.717 411~0.719 163，平均值为0.717 998，与黄土高原末次冰期黄土的⁸⁷Sr/⁸⁶Sr值（变化范围为0.718 235~0.719 673，平均值为0.718 623）几乎一致；巫山黄土ε_Nd（0）值在-10.1~-11.7之间，平均值为-11.4，明显与长江上游现代河漫滩沉积物ε_Nd（0）值（-5.9~-7.2）差别较大，而与黄土高原黄土ε_Nd（0）值（-9.2~-11.3）接近.研究结果表明巫山黄土的粉尘主要为北方输入，与黄土高原黄土同源.据此认为，巫山黄土的形成并不是因为冰期导致三峡地区干旱河滩干涸暴露而引发粉尘近源堆积，这与近年来长江下游下蜀黄土的研究结果有所不同.
- 巫山黄土 /
- Sr-Nd同位素 /
- 黄土高原 /
- 物源示踪 /
- 地球化学
Abstract: As one of the most important elements of the loess in southern China,the provenance of "Wushan Loess" can provide crucial environmental information to deciphering valuable sedimentary record in the area. Based on previous studies,we have collected samples from "Wushan Loess" profile and carried out Sr-Nd isotope analysis,and compared with sediments synchronous to Loess Plateau and fluvial sediments with nearby provenance. The results show that the variation range of ⁸⁷Sr/⁸⁶Sr of "Wushan Loess" is 0.717 411-0.719 163 with an average value of 0.717 998,which is almost identical with the ⁸⁷Sr/⁸⁶Sr values of Loess Plateau during the last glacial period (variation range is 0.718 235 to 0.719 673,average is 0.718 623).The value of ε_Nd(0) of "Wushan Loess" loess ranges from -10.1 to -11.7 with an average value of -11.4,which is quite different from the value of ε_Nd(0) (-5.9 to -7.2) of modern floodplain sediments in the upper reaches of the Yangtze River,is close to that of Loess Plateau (-9.2 to -11.3). Our research shows that the dust of "Wushan Loess" is mainly imported from the north and is homologous to the loess of Loess Plateau. Therefore,we believe that "Wushan Loess" is not formed by stockpiling dust from the drying up tributaries in Three Gorges area due to the glacial period,which is different from the research result of "Xiashu Loess" in the lower reaches of the Yangtze River in recent years.
- Wushan Loess /
- Sr-Nd isotopic /
- Loess Plateau /
- provenance tracing /
- geochemistry

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图 1 中国黄土分布（a）和巫山黄土剖面（b）

T1~T8代表黄土高原典型黄土剖面位置

Fig. 1. Sketch map showing loess distribution in China (a) and the "Wushan Loess" profile (b)

下载: 全尺寸图片幻灯片

图 2 巫山剖面岩性柱状图（a）和酸不溶物⁸⁷Sr/⁸⁶Sr与中值粒径（Md）的变化（b）

Fig. 2. Stratigraphic histogram(a) and variations of ⁸⁷Sr/⁸⁶Sr of residues and median grain size(Md)(b)of "Wushan Loess" profile

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图 3 黄土高原典型黄土剖面及巫山剖面沉积物酸不溶物Sr-Nd同位素组成

底图据李高军（2010）修改，典型黄土剖面数据来源于文献（Nakano et al., 2004; Yokoo et al., 2004;Yang et al., 2009;李高军, 2010）

Fig. 3. The Sr-Nd isotopic composition of residues of typical loess profiles in the CLP and "Wushan Loess"

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图 4 长江流域现代河流沉积物与巫山剖面黄土状堆积物Sr-Nd同位素组成对比

长江干流及部分支流悬浮物（酸不溶物）数据引自文献（Yang et al., 2007;邵磊等, 2014）；三江源地区河流及金沙江沉积物（酸不溶物）数据引自文献(Wu et al., 2010；茅昌平等, 2011)

Fig. 4. ⁸⁷Sr/⁸⁶Sr versus ε_Nd(0) diagram of the Yangtze River sediments and loess samples of the "Wushan Loess" profile

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表 1 巫山剖面样品酸不溶物Sr-Nd同位素数据

Table 1. Results of ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd of residues of the "Wushan Loess" profile

样品号	深度(m)	⁸⁷Sr/⁸⁶Sr	2σ (10^-⁶)	¹⁴³Nd/¹⁴⁴Nd	2σ (10^-⁶)	ε_Nd(0)
WS-3-9	2.45	0.718 035	8	0.512 081	8	-10.9
WS-4-13	3.65	0.718 355	3	0.512 099	2	-10.5
WS-5-17	4.85	0.717 958	7	0.512 119	3	-10.1
WS-6-9	5.45	0.717 411	9	0.512 062	6	-11.2
WS-7-13	6.65	0.717 770	4	0.512 046	5	-11.5
WS-8-17	7.85	0.719 163	4	0.512 063	6	-11.2
WS-10-1	9.05	0.718 253	5	0.512 037	3	-11.7
WS-11-5	10.25	0.717 549	4	0.512 083	6	-10.8
WS-12-8	11.40	0.717 964	6	0.512 047	7	-11.5
WS-13-12	12.60	0.717 520	7	0.512 045	5	-11.6
平均值		0.717 998	6	0.512 068	5	-11.4
注：Sr同位素标准化值⁸⁸Sr/⁸⁶Sr=8.375 209，Nd同位素标准化值¹⁴⁶Nd/¹⁴⁴Nd=0.721 900；标准偏差：±2σ_m. ε_Nd(0)=[(¹⁴³Nd/¹⁴⁴Nd)_sample/(¹⁴³Nd/¹⁴⁴Nd)_CHUR-1]×10⁴，(¹⁴³Nd/¹⁴⁴Nd)_CHUR=0.512 638.

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表 2 前人报道的黄土高原黄土酸不溶物Sr-Nd同位素组成

Table 2. Sr and Nd isotopic compositions of acid insoluble residues from the CLP from the previous studies

样品号	地点	样品	酸淋洗	⁸⁷Sr/⁸⁶Sr	¹⁴³Nd/¹⁴⁴Nd	ε_Nd(0)	参考文献
T1	西峰	S0	醋酸淋洗处理	0.719 260	0.512 106	-10.4	李高军, 2010
T1	西峰	L1	醋酸淋洗处理	0.718 417	0.512 164	-9.2	Yang et al., 2009
T1	西峰	L1	醋酸淋洗处理	0.718 640	0.512 085	-10.8	李高军, 2010
T2	环县	S0	醋酸淋洗处理	0.718 627	0.512 127	-10.0	李高军, 2010
T2	环县	L1	醋酸淋洗处理	0.718 316	0.512 092	-10.4	Yang et al., 2009
T2	环县	L1	醋酸淋洗处理	0.718 193	0.512 088	-10.7	李高军, 2010
T3	洛川	S0	醋酸淋洗处理	0.718 378	0.512 106	-10.4	李高军, 2010
T3	洛川	L1	醋酸淋洗处理	0.718 613	0.512 101	-10.5	李高军, 2010
T3	洛川	L1	醋酸淋洗处理	0.718 258	0.512 126	-10.0	Yang et al., 2009
T4	腊子口	浅层黄土	醋酸淋洗处理	0.718 235	0.512 121	-10.1	Yang et al., 2009
T5	银川	浅层黄土	醋酸淋洗处理	0.718 810	0.512 100	-10.5	Yokoo et al., 2004
T6	兰州	浅层黄土	醋酸淋洗处理	0.719 440	0.512 060	-11.3	Yokoo et al., 2004
T6	兰州	浅层黄土	醋酸淋洗处理	0.717 111	0.512 086	-10.8	Nakano et al., 2004
T7	西安	浅层黄土	醋酸淋洗处理	0.718 320	0.512 150	-9.4	Yokoo et al., 2004
T8	渭南	S0	醋酸淋洗处理	0.720 191	0.512 092	-10.7	李高军, 2010
T8	渭南	L1	醋酸淋洗处理	0.719 155	0.512 109	-10.3	李高军, 2010
平均值				0.718 623	0.512 107	-10.3
注：Sr同位素标准化值⁸⁸Sr/⁸⁶Sr=8.375 209，Nd同位素标准化值¹⁴⁶Nd/¹⁴⁴Nd=0.721 900；标准偏差：±2σ_m. ε_Nd(0)=[(¹⁴³Nd/¹⁴⁴Nd)_sample/(¹⁴³Nd/¹⁴⁴Nd)_CHUR-1]×10⁴，(¹⁴³Nd/¹⁴⁴Nd)_CHUR=0.512 638.

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