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

綦琳; 乔彦松; 刘宗秀; 王燕; 彭莎莎

doi:10.12090/j.issn.1006-6616.2021.27.03.043

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

doi: 10.12090/j.issn.1006-6616.2021.27.03.043

綦琳^{1, 2,},
乔彦松^{1, 2, 4},
刘宗秀^{1, 2},
王燕^{1, 2},
彭莎莎³

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.
中国科学院广州地球化学研究所, 广东广州 510640
4.
中国地质调查局新构造与地壳稳定性研究中心, 北京 100081

基金项目:

国家自然科学基金项目 41907377

国家自然科学基金项目 41888101

国家自然科学基金项目 41772383

详细信息

作者简介:
綦琳(1989-), 女, 博士, 助理研究员, 主要从事第四纪古气候研究工作。E-mail: liuyingqilin@sina.com

中图分类号: P534.63;P534.62
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-01
- 修回日期: 2021-02-11
- 刊出日期: 2021-06-28

Geochemical characteristics of the Tertiary and Quaternary eolian deposits in eastern Gansu province: Implications for provenance and weathering intensity

QI Lin^{1, 2
,},
QIAO Yansong^{1, 2, 4},
LIU Zongxiu^{1, 2},
WANG Yan^{1, 2},
PENG Shasha³

1.
Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Neotectonic Movement and Geohazard, Institute of Geomechanics, Beijing 100081, China
3.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
4.
Research Center of Neotectonism and Crustal Stability, China Geological Survey, Beijing 100081, China

Funds:

the National Science Foundation of China 41907377

the National Science Foundation of China 41888101

the National Science Foundation of China 41772383

摘要

摘要: 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，Na₂O、稀土元素La-Lu、Y含量较低。风化参数Na₂O/Al₂O₃、化学风化参数CIA以及Al₂O₃-CaO+Na₂O-K₂O (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(TiO₂/Al₂O₃，SiO₂/Al₂O₃，SiO₂/TiO₂，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ε_N_d(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。
- 风尘堆积 /
- 红粘土 /
- 地球化学 /
- 物源 /
- 黄土高原
Abstract: 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 Na₂O, La-Lu, Y. In comparison with the Quaternary loess, chemical weathering parameters such as Na₂O/Al₂O₃, 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 TiO₂/Al₂O₃, SiO₂/Al₂O₃, SiO₂/TiO₂, 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, ε_Nd(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.
- eolian deposits /
- red clay /
- geochemistry /
- provenance /
- Chinese Loess Plateau
注释:

责任编辑：吴芳

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图 1 邵寨剖面位置图

Figure 1. Map showing the location of the Shaozhai section in the Chinese Loess Plateau

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图 2 邵寨剖面岩性地层及磁性地层

Figure 2. Lithostratigraphy and magnetostratigraphy of the Shaozhai section

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图 3 邵寨剖面样品常量元素的UCC标准化值

a—邵寨剖面所有样品的UCC标准化值；b—新近纪红粘土与第四纪黄土UCC标准化均值及标准差值

Figure 3. UCC-normalized abundances of major elements for the samples from the Shaozhai section. (a) Data for all studied samples. (b) Average and standard deviation for the Tertiary red clay and Quaternary loess.

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图 4 邵寨剖面样品不易迁移常量元素比值图

Figure 4. Plots of immobile major element ratios for the samples from the Shaozhai section. (a) SiO₂/Al₂O₃ versus SiO₂/TiO₂. (b) TiO₂/Al₂O₃ versus SiO₂/TiO₂. (c) SiO₂/Al₂O₃ versus TiO₂/Al₂O₃

a—SiO₂/Al₂O₃-SiO₂/TiO₂; b—TiO₂/Al₂O₃-SiO₂/TiO₂; c—SiO₂/Al₂O₃-TiO₂/Al₂O₃

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图 5 邵寨剖面样品的Na₂O/Al₂O₃-K₂O/Al₂O₃图

Figure 5. Na₂O/Al₂O₃ versus K₂O/Al₂O₃ diagram for the samples from the Shaozhai section

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图 6 邵寨剖面样品A-CN-K(Al₂O₃-CaO+Na₂O-K₂O)图

Figure 6. A-CN-K (Al₂O₃-CaO+Na₂O-K₂O) triangular diagram for the samples from the Shaozhai section

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图 7 邵寨剖面样品微量元素的UCC标准化值

a—邵寨剖面所有样品的UCC标准化值；b—新近纪红粘土与第四纪黄土UCC标准化均值及标准差值

Figure 7. UCC-normalized abundances of trace elements for the samples from the Shaozhai section. (a) Standard data for all studied samples. (b) Standard average and standard deviation for the Tertiary red clay and Quaternary loess.

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图 8 邵寨剖面样品不易迁移微量元素比值图

Figure 8. Plots of immobile trace element ratios for the samples from the Shaozhai section

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图 9 邵寨剖面样品稀土元素球粒陨石标准化分布模式图

a—邵寨剖面所有样品的球粒陨石标准化值；b—新近纪红粘土与第四纪黄土球粒陨石标准化均值及标准差

Figure 9. Chondrite-normalized abundances of trace elements for the samples from the Shaozhai section. (a) Data for all studied samples. (b) Average data and standard deviation for the Tertiary red clay and Quaternary loess.

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图 10 邵寨剖面样品的LREE/HREE-∑REE、La_N/Sm_N-Gd_N/Lu_N、Eu/Eu^*-Ce/Ce^*图解

Figure 10. LREE/HREE versus ∑REE, La_N/Sm_N versus Gd_N/Lu_N and Eu/Eu^* versus Ce/Ce^* diagrams for the samples from the Shaozhai section

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图 11 邵寨剖面样品ε_Nd(0)变化图

Figure 11. Variations in ε_Nd(0) of the samples from the Shaozhai section

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表 1 邵寨剖面样品常量元素数据表(单位%)

Table 1. Major element concentrations (%) of the samples from the Shaozhai section

深度/m	层位	样品号	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	K₂O	Na₂O	TiO₂	MnO	P₂O₅	Total	LOI
第四纪黄土-古土壤
5.0	L2	08SZ50	70.46	15.60	4.03	1.31	2.35	3.14	1.99	0.81	0.13	0.18	100	4.16
25.0	S4	08SZ250	69.97	15.87	5.26	0.72	2.17	3.24	1.69	0.83	0.14	0.13	100	4.20
33.4	S5	08SZ830	68.57	16.69	6.11	0.60	2.08	3.40	1.41	0.89	0.14	0.12	100	4.70
51.2	L8	08SZ450	70.17	15.30	5.22	1.21	2.10	3.14	1.76	0.79	0.12	0.19	100	3.77
67.3	S10	08SZ650	68.96	15.94	5.74	1.03	2.25	3.34	1.63	0.82	0.14	0.16	100	4.10
70.4	S11	08SZ1200	69.65	16.15	5.67	0.64	1.97	3.56	1.31	0.82	0.14	0.09	100	4.06
95.4	S18	08SZ1450	69.42	16.03	5.83	0.79	2.23	3.27	1.38	0.83	0.14	0.09	100	3.95
119.4	S24	08SZ1690	69.29	15.83	5.84	0.99	2.24	3.42	1.31	0.82	0.13	0.14	100	3.94
133.4	L27	08SZ1830	69.27	15.78	5.54	1.21	2.39	3.13	1.54	0.82	0.13	0.20	100	4.26
141.4	S29	08SZ1910	69.00	16.16	5.92	0.92	2.30	3.36	1.26	0.82	0.14	0.13	100	4.08
150.4	S32	08SZ2000	71.43	14.65	4.86	1.04	2.41	3.02	1.56	0.76	0.10	0.17	100	3.42
		平均	69.65	15.82	5.46	0.95	2.23	3.27	1.53	0.82	0.13	0.14		4.06
		标准偏差	0.81	0.52	0.60	0.24	0.14	0.16	0.23	0.03	0.01	0.04		0.32
		变异系数	1.17	3.30	10.93	25.26	6.15	4.85	14.73	3.65	8.38	25.44		7.79
新近纪红粘土
165.2		07SZ472	69.51	15.98	5.48	0.97	2.44	3.14	1.42	0.82	0.13	0.14	100	4.22
173.4		07SZ800	68.26	16.53	5.86	1.05	2.79	3.20	1.19	0.85	0.13	0.14	100	4.51
178.2		07SZ1660	68.32	16.74	6.22	0.97	2.43	3.21	1.04	0.84	0.14	0.09	100	4.55
187.5		07SZ2032	68.73	16.27	6.04	1.14	2.43	3.26	1.06	0.81	0.13	0.13	100	4.53
199.4		07SZ2506	68.46	16.50	6.06	1.01	2.54	3.29	1.08	0.82	0.14	0.10	100	4.35
205.3		SZB160	68.74	16.17	5.72	1.03	2.62	3.24	1.39	0.84	0.14	0.13	100	4.41
207.1		07SZ2815	67.71	16.91	6.14	0.87	2.63	3.57	1.14	0.81	0.15	0.08	100	4.34
216.8		07SZ3204	69.62	15.85	5.75	1.25	2.44	3.08	0.87	0.83	0.12	0.20	100	4.69
225.1		SZC48	67.97	15.83	5.85	0.89	4.13	3.41	0.90	0.83	0.13	0.05	100	4.48
226.7	红粘土	07SZ3600	69.57	16.14	5.87	1.01	2.35	3.08	0.93	0.83	0.14	0.08	100	4.32
228.9		SZC200	69.05	16.09	5.77	1.04	2.77	3.21	0.99	0.83	0.14	0.11	100	4.45
229.4		07SZ3709	69.12	16.12	5.84	1.03	2.69	3.06	1.08	0.82	0.13	0.12	100	4.35
232.4		07SZ4015	68.93	16.26	5.71	1.16	2.73	3.23	0.86	0.84	0.13	0.16	100	4.49
233.9		SZC400	69.32	15.60	5.55	1.15	3.37	3.01	0.90	0.84	0.12	0.15	100	4.64
236.4		07SZ4306	68.77	16.33	5.94	0.84	2.59	3.36	1.15	0.82	0.14	0.07	100	4.16
238.9		SZC600	68.59	16.23	6.03	1.01	2.85	3.28	0.97	0.82	0.13	0.09	100	4.43
240.2		07SZ4530	67.81	16.61	5.70	0.98	3.11	3.45	1.23	0.83	0.13	0.14	100	4.52
247.9		07SZ4840	69.15	16.21	5.98	0.93	2.66	3.13	0.90	0.82	0.13	0.09	100	4.55
250.7		SZD240	66.79	16.29	5.66	1.20	4.24	3.44	1.26	0.81	0.15	0.17	100	4.48
		平均	68.65	16.24	5.85	1.03	2.83	3.25	1.07	0.83	0.13	0.12		4.44
		标准偏差	0.73	0.32	0.20	0.11	0.54	0.15	0.17	0.01	0.01	0.04		0.13
		变异系数	1.06	1.97	3.37	10.88	18.96	4.61	15.84	1.34	6.73	30.65		3.00
UCC(Taylor and Mclennan, 1985；McLennan，2001)
			66.00	15.20	5.00	4.20	2.20	3.40	3.90	0.68	0.07

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表 2 邵寨剖面样品微量元素数据表(单位μg/g)

Table 2. Trace element concentrations (μg/g) of the samples from the Shaozhai section

样品号	Li	Be	Sc	V	Co	Ni	Ga	Rb	Sr	Y	Zr	Nb	Cs	Ba	Hf	Ta	Tl	Pb	Bi	Th	U
第四纪黄土-古土壤
08SZ50	44.80	2.14	13.60	115.00	16.40	42.30	20.60	102.00	108.00	29.50	222.00	17.10	8.72	449.00	5.10	1.66	0.65	22.80	0.36	15.60	2.45
08SZ250	43.70	2.06	14.90	114.00	16.90	50.20	20.30	119.00	117.00	31.20	213.00	16.10	10.60	505.00	5.93	1.82	0.71	26.60	0.41	16.70	2.39
08SZ830	40.80	1.92	13.30	110.00	15.10	39.40	18.50	111.00	122.00	31.20	252.00	16.60	7.77	510.00	5.87	1.64	0.59	22.00	0.32	15.80	2.57
08SZ450	43.60	2.06	14.60	114.00	16.50	42.80	20.70	118.00	107.00	28.20	226.00	16.60	9.55	505.00	5.69	1.63	0.70	25.30	0.37	16.80	2.48
08SZ650	42.60	2.11	15.20	115.00	16.80	44.70	19.90	120.00	109.00	32.00	216.00	15.90	10.50	537.00	6.16	1.83	0.70	27.00	0.41	17.70	2.43
08SZ1200	48.10	2.17	14.00	121.00	16.70	44.00	20.50	105.00	114.00	32.70	233.00	17.60	9.74	469.00	5.65	1.78	0.65	23.40	0.36	16.50	2.64
08SZ1450	46.50	2.06	13.90	112.00	16.50	42.30	20.10	103.00	106.00	30.30	226.00	16.60	9.58	455.00	5.85	1.66	0.68	24.50	0.38	16.80	2.54
08SZ1690	50.10	2.21	13.00	125.00	17.80	55.90	20.50	84.00	98.40	30.30	228.00	17.20	10.80	436.00	6.07	2.02	0.67	26.20	0.41	15.20	2.54
08SZ1830	43.40	2.12	14.70	113.00	15.90	41.00	20.00	116.00	122.00	35.50	225.00	16.30	9.07	478.00	6.06	1.76	0.68	25.10	0.37	16.20	2.64
08SZ1910	44.70	2.20	13.90	118.00	17.10	45.50	20.50	110.00	102.00	35.00	226.00	16.80	10.90	494.00	6.04	1.97	0.69	25.80	0.42	17.90	2.43
08SZ2000	37.30	1.84	12.80	95.80	13.40	35.30	17.50	110.00	128.00	31.60	257.00	15.20	7.12	471.00	6.97	1.70	0.60	22.10	0.29	14.30	2.48
平均	44.15	2.08	13.99	113.89	16.28	43.95	19.92	108.91	112.13	31.59	229.00	16.55	9.49	482.64	5.94	1.77	0.67	24.62	0.37	16.32	2.51
标准偏差	3.45	0.11	0.79	7.35	1.17	5.44	1.01	10.41	9.25	2.19	13.58	0.66	1.24	30.41	0.45	0.13	0.04	1.79	0.04	1.06	0.08
变异系数	7.81	5.48	5.63	6.45	7.20	12.38	5.05	9.56	8.25	6.92	5.92	4.01	13.07	6.30	7.55	7.46	5.99	7.29	10.87	6.48	3.38
新近纪红粘土
07SZ472	49.70	2.24	15.40	127.00	17.00	46.30	20.20	127.00	109.00	28.40	236.00	16.60	11.10	531.00	5.99	1.88	0.71	28.10	0.43	19.00	2.52
07SZ800	51.40	2.13	15.00	120.00	17.60	45.30	21.00	129.00	103.00	26.10	191.00	16.50	10.90	485.00	4.75	1.65	0.74	27.40	0.43	16.80	2.37
07SZ1660	45.00	2.10	15.30	112.00	16.40	43.90	20.00	119.00	114.00	31.50	234.00	15.90	9.61	516.00	6.41	1.83	0.69	26.40	0.38	17.40	2.51
07SZ2032	51.00	2.27	15.20	131.00	17.70	46.80	21.70	125.00	101.00	30.10	225.00	16.90	10.80	507.00	5.83	1.74	0.71	27.30	0.39	17.60	2.57
07SZ2506	54.20	2.24	16.30	130.00	17.90	58.10	21.80	133.00	105.00	31.40	245.00	17.50	11.20	519.00	5.93	1.75	0.70	26.20	0.40	19.00	2.61
SZB160	48.60	2.17	14.80	121.00	18.30	47.10	21.40	117.00	108.00	30.30	238.00	17.70	9.92	493.00	5.50	1.70	0.67	24.60	0.38	16.70	2.50
07SZ2815	44.30	2.18	15.70	120.00	17.30	48.20	20.70	126.00	107.00	32.00	233.00	17.20	11.30	505.00	5.89	1.87	0.69	27.40	0.41	18.80	2.51
07SZ3204	45.50	2.24	11.50	119.00	16.50	45.30	20.10	78.20	77.40	22.20	209.00	16.00	9.91	387.00	5.71	1.70	0.64	24.90	0.42	13.30	2.26
SZC48	50.10	2.04	15.30	117.00	16.00	44.30	20.20	118.00	107.00	32.40	281.00	17.10	9.86	448.00	6.45	1.78	0.65	23.30	0.39	17.20	2.57
07SZ3600	46.50	2.28	15.60	121.00	17.60	47.40	21.40	125.00	104.00	30.50	193.00	15.90	11.30	510.00	5.31	1.80	0.76	27.90	0.41	17.60	2.34
SZC200	46.40	2.09	15.50	108.00	16.80	46.00	20.10	127.00	113.00	33.20	224.00	15.60	11.30	494.00	6.11	1.75	0.73	26.80	0.41	18.00	2.52
07SZ3709	43.00	1.97	15.00	112.00	16.50	44.90	19.20	110.00	105.00	31.60	240.00	15.90	10.10	480.00	6.11	1.75	0.62	24.50	0.38	18.10	2.56
07SZ4015	41.90	2.16	14.80	116.00	16.40	45.80	19.40	117.00	103.00	30.20	238.00	15.60	10.50	491.00	6.46	1.82	0.68	27.20	0.42	17.00	2.43
SZC400	46.10	2.07	14.40	110.00	16.40	45.40	19.90	111.00	99.60	29.10	227.00	15.40	11.00	448.00	6.30	1.75	0.69	28.00	0.41	16.00	2.43
07SZ4306	44.00	1.87	13.80	105.00	15.10	41.00	18.80	101.00	94.70	29.80	217.00	15.30	8.92	431.00	4.92	1.52	0.62	21.70	0.34	16.50	2.25
SZC600	47.90	2.06	13.80	122.00	17.00	44.30	20.60	111.00	101.00	26.10	232.00	16.20	9.97	444.00	5.86	1.67	0.69	25.50	0.39	15.20	2.46
07SZ4530	49.50	2.16	15.20	118.00	16.70	46.40	19.70	120.00	105.00	31.80	229.00	15.80	11.20	503.00	5.94	1.78	0.68	27.00	0.41	19.20	2.77
07SZ4840	48.10	2.16	14.50	121.00	17.10	44.30	20.60	110.00	102.00	25.00	208.00	15.90	11.00	434.00	5.65	1.76	0.74	28.10	0.45	14.20	2.24
SZD240	48.30	2.08	13.30	120.00	16.60	46.30	19.80	85.80	104.00	28.10	287.00	16.70	9.23	430.00	6.75	1.70	0.64	24.80	0.42	16.30	2.43
平均	47.45	2.13	14.76	118.42	16.89	46.16	20.35	115.26	103.30	29.46	230.89	16.30	10.48	476.63	5.89	1.75	0.69	26.16	0.40	17.05	2.47
标准偏差	3.15	0.11	1.08	6.90	0.75	3.30	0.84	14.28	7.71	2.87	24.05	0.72	0.76	39.09	0.51	0.08	0.04	1.79	0.02	1.60	0.13
变异系数	6.64	4.94	7.29	5.83	4.43	7.14	4.12	12.39	7.47	9.74	10.41	4.41	7.27	8.20	8.73	4.75	5.87	6.84	6.08	9.36	5.44
UCC(Taylor and Mclennan, 1985；McLennan，2001)
	20.00	3.00	13.60	107.00	17.00	44.00	17.00	112.00	350.00	22.00	190.00	12.00	4.60	550.00	5.80	1.00	0.75	17.00	0.13	10.70	2.80

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表 3 邵寨剖面样品稀土元素数据表(单位μg/g)

Table 3. Rare earth element concentrations (μg/g) of the samples from the Shaozhai section

样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	∑REE	LREE/HREE	La_N/Sm_N	Gd_N/Yb_N	Eu/Eu^*	Ce/Ce^*
第四纪黄土-古土壤
08SZ50	38.80	81.10	8.73	31.30	6.22	1.09	5.25	0.82	5.10	0.99	3.02	0.45	3.01	0.41	29.50	215.79	3.44	3.94	1.59	0.58	1.06
08SZ250	46.10	92.70	11.60	43.00	8.09	1.47	6.33	1.00	6.36	1.15	3.26	0.47	3.03	0.46	31.20	256.22	3.81	3.60	1.71	0.63	0.97
08SZ830	37.60	84.90	8.60	32.00	6.46	1.17	5.41	0.85	5.20	1.05	3.16	0.49	3.00	0.42	31.20	221.51	3.36	3.68	1.60	0.61	1.14
08SZ450	41.60	90.30	9.35	32.50	6.18	1.18	4.81	0.86	5.11	0.98	2.96	0.45	3.04	0.44	28.20	227.96	3.87	4.25	1.36	0.66	1.10
08SZ650	44.00	99.00	10.60	39.00	7.28	1.26	5.76	0.95	5.97	1.15	3.29	0.48	3.17	0.48	32.00	254.39	3.78	3.82	1.49	0.60	1.10
08SZ1200	44.80	95.60	10.10	37.40	7.63	1.41	6.21	0.94	5.53	1.08	3.30	0.51	3.17	0.43	32.70	250.81	3.66	3.71	1.79	0.63	1.08
08SZ1450	41.80	94.80	9.92	33.70	6.47	1.19	5.14	0.91	5.68	1.08	3.28	0.50	3.23	0.48	30.30	238.48	3.71	4.08	1.33	0.63	1.12
08SZ1690	43.00	81.50	10.10	37.80	7.41	1.36	5.74	0.90	5.41	1.10	3.17	0.44	2.86	0.41	30.30	231.50	3.60	3.66	1.74	0.64	0.94
08SZ1830	45.20	99.30	11.10	40.50	7.64	1.45	6.49	1.04	6.47	1.20	3.55	0.54	3.52	0.52	35.50	264.02	3.49	3.74	1.55	0.63	1.07
08SZ1910	45.30	87.30	11.10	41.20	8.22	1.48	6.48	1.04	6.45	1.27	3.69	0.52	3.27	0.49	35.00	252.81	3.34	3.48	1.64	0.62	0.94
08SZ2000	38.40	84.70	9.71	34.60	6.66	1.26	5.51	0.93	5.83	1.11	3.21	0.48	3.12	0.46	31.60	227.58	3.36	3.64	1.49	0.64	1.06
平均	42.42	90.11	10.08	36.64	7.11	1.30	5.74	0.93	5.74	1.11	3.26	0.48	3.13	0.45	31.59
标准偏差	3.03	6.65	0.97	4.05	0.75	0.14	0.58	0.07	0.52	0.09	0.21	0.03	0.18	0.04	2.19
变异系数	7.14	7.38	9.60	11.04	10.48	10.59	10.02	7.92	9.12	7.75	6.43	6.48	5.60	7.89	6.92
新近纪红粘土
07SZ472	45.00	97.80	9.93	36.30	6.79	1.20	5.03	0.82	5.03	1.00	3.06	0.46	2.95	0.41	28.40	244.18	4.18	4.18	1.52	0.63	1.11
07SZ800	36.80	79.40	8.61	29.70	5.62	1.01	4.56	0.77	4.70	0.89	2.72	0.41	2.79	0.39	26.10	204.47	3.72	4.13	1.45	0.61	1.07
07SZ1660	42.50	95.00	10.50	37.40	7.07	1.27	5.66	0.94	5.93	1.13	3.33	0.50	3.34	0.48	31.50	246.55	3.67	3.80	1.46	0.61	1.08
07SZ2032	43.80	99.30	10.50	37.50	7.13	1.26	5.49	0.93	5.70	1.09	3.24	0.48	3.18	0.47	30.10	250.17	3.94	3.88	1.45	0.62	1.12
07SZ2506	41.50	100.00	9.26	33.90	6.53	1.24	5.33	0.85	5.40	1.08	3.31	0.50	3.19	0.44	31.40	243.93	3.74	4.01	1.50	0.64	1.23
SZB160	40.70	88.40	9.07	31.30	6.18	1.09	5.29	0.85	5.07	1.03	3.10	0.47	3.07	0.42	30.30	226.34	3.56	4.16	1.56	0.58	1.11
07SZ2815	40.60	88.00	9.33	33.90	6.60	1.23	5.32	0.86	5.56	1.13	3.40	0.51	3.16	0.44	32.00	232.04	3.43	3.88	1.50	0.63	1.09
07SZ3204	33.30	76.50	8.23	29.70	5.48	1.01	4.32	0.69	4.36	0.80	2.39	0.35	2.39	0.34	22.20	192.06	4.08	3.84	1.58	0.63	1.11
SZC48	41.90	83.30	9.41	33.70	6.53	1.22	5.36	0.85	5.20	1.04	3.20	0.49	3.08	0.44	32.40	228.12	3.38	4.05	1.51	0.63	1.01
07SZ3600	43.50	96.50	10.30	36.50	6.74	1.21	5.22	0.91	5.76	1.09	3.19	0.47	2.94	0.44	30.50	245.27	3.85	4.08	1.47	0.62	1.10
SZC200	43.30	97.30	10.80	39.70	7.54	1.40	6.19	1.05	6.30	1.19	3.48	0.50	3.33	0.48	33.20	255.76	3.59	3.63	1.60	0.63	1.08
07SZ3709	42.50	86.10	9.76	36.40	7.15	1.27	5.62	0.89	5.59	1.10	3.31	0.48	3.04	0.43	31.60	235.24	3.52	3.75	1.62	0.61	1.02
07SZ4015	38.90	90.30	9.33	33.70	6.43	1.16	5.01	0.84	5.39	1.06	3.17	0.48	3.09	0.45	30.20	229.51	3.62	3.82	1.38	0.63	1.14
SZC400	37.90	87.30	9.40	33.80	6.32	1.11	5.14	0.84	5.49	1.02	3.02	0.46	3.05	0.44	29.10	224.39	3.62	3.79	1.45	0.60	1.11
07SZ4306	39.60	83.30	8.86	31.80	6.03	1.15	5.08	0.84	5.03	0.99	3.03	0.46	2.93	0.41	29.80	219.31	3.52	4.15	1.54	0.64	1.07
SZC600	34.60	80.00	8.02	28.00	5.36	1.00	4.41	0.74	4.53	0.87	2.76	0.42	2.83	0.41	26.10	200.05	3.64	4.08	1.34	0.63	1.16
07SZ4530	42.50	90.90	9.98	37.10	7.42	1.26	5.60	0.91	5.59	1.15	3.26	0.48	3.07	0.44	31.80	241.46	3.62	3.62	1.58	0.60	1.06
07SZ4840	33.60	72.60	8.31	29.90	5.48	0.99	4.29	0.72	4.55	0.85	2.52	0.37	2.53	0.38	25.00	192.09	3.66	3.87	1.40	0.62	1.05
SZD240	37.80	76.60	8.23	30.50	6.06	1.10	4.52	0.75	4.58	0.93	2.84	0.43	2.65	0.38	28.10	205.47	3.55	3.94	1.48	0.64	1.05
平均	40.02	87.82	9.36	33.73	6.45	1.17	5.13	0.84	5.25	1.02	3.07	0.46	2.98	0.43	29.46
标准偏差	3.53	8.41	0.84	3.30	0.66	0.11	0.51	0.09	0.53	0.11	0.30	0.04	0.25	0.04	2.87
变异系数	8.81	9.58	9.01	9.79	10.26	9.69	10.03	10.25	10.18	10.75	9.73	9.63	8.44	8.44	9.74
UCC(Taylor and Mclennan, 1985；McLennan，2001)
	30.00	64.00	7.10	26.00	4.50	0.88	3.80	0.64	3.50	0.80	2.30	0.33	2.20	0.32
球粒陨石(Taylor and Mclennan, 1985；McLennan，2001)
	0.310	0.808	0.122	0.600	0.165	0.074	0.259	0.047	0.322	0.072	0.210	0.032	0.209	0.034

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表 4 邵寨剖面样品Sm-Nd同位素数据表

Table 4. Sm-Nd data of the samples from the Shaozhai section

样品号	Sm (μg/g)	Nd (μg/g)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd (±2σ*10^-6)	ε_Nd(0)
第四纪黄土-古土壤
08SZ250	3.592	20.218	0.1075	0.512065±8	-11.1775
08SZ830	3.650	20.270	0.1089	0.512083±7	-10.8264
08SZ450	4.425	24.828	0.1078	0.512077±9	-10.9434
08SZ650	3.511	19.263	0.1103	0.512077±12	-10.9434
08SZ1200	3.509	19.245	0.1103	0.512079±7	-10.9044
08SZ1450	3.599	19.808	0.1099	0.512078±6	-10.9239
08SZ1690	3.956	21.959	0.1090	0.512084±6	-10.8068
新近纪红粘土
07SZ472	3.436	19.594	0.1061	0.51207±7	-11.0799
07SZ1660	3.287	18.670	0.1065	0.512074±7	-11.0019
07SZ2032	3.307	19.056	0.1050	0.512068±11	-11.1190
07SZ2506	3.355	19.112	0.1062	0.512071±7	-11.0604
SZB160	3.445	20.040	0.1040	0.512065±5	-11.1775
07SZ2815	3.346	19.157	0.1057	0.512062±5	-11.2360
07SZ3204	3.378	19.545	0.1046	0.512063±7	-11.2165
SZC48	3.406	19.442	0.1060	0.512076±6	-10.9629
07SZ3600	3.900	21.848	0.1080	0.512069±6	-11.0995
SZC200	3.472	20.016	0.1049	0.512079±8	-10.9044
07SZ3709	3.799	21.567	0.1066	0.512092±8	-10.6508
07SZ4015	3.439	19.560	0.1064	0.512078±5	-10.9239
07SZ4306	3.485	19.602	0.1075	0.512085±5	-10.7873
SZC600	3.057	17.490	0.1057	0.512079±6	-10.9044

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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

doi: 10.12090/j.issn.1006-6616.2021.27.03.043

作者简介:
綦琳(1989-), 女, 博士, 助理研究员, 主要从事第四纪古气候研究工作。E-mail: liuyingqilin@sina.com

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Geochemical characteristics of the Tertiary and Quaternary eolian deposits in eastern Gansu province: Implications for provenance and weathering intensity

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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

doi: 10.12090/j.issn.1006-6616.2021.27.03.043

作者简介: 綦琳(1989-), 女, 博士, 助理研究员, 主要从事第四纪古气候研究工作。E-mail: liuyingqilin@sina.com

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Geochemical characteristics of the Tertiary and Quaternary eolian deposits in eastern Gansu province: Implications for provenance and weathering intensity

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作者简介:
綦琳(1989-), 女, 博士, 助理研究员, 主要从事第四纪古气候研究工作。E-mail: liuyingqilin@sina.com