红色风化壳地球化学特征及对古气候演变的响应——以辽南石槽剖面为例

doi:10.13249/j.cnki.sgs.2018.02.018

Abstract

Abstract:

Based on analyzed the major elements contents and other geochemical parameters of the red weathering crust from the Shicao profile in the southern of Liaoning Province, the geochemical characteristics of the weathering process and paleoclimate evolution were discussed. The results showed that the major elements are mainly composed of SiO₂, Al₂O₃and Fe₂O₃. Compared to the bedrock, Ca has been leached out strongly, while other major elements relatively enriched in the red weathering crust of Shicao profile. In general, the intensity of chemical weathering in Shicao profile was lower than the red weathering crust from the southern China, which indicated a moderate chemical weathering intensity under warm and moist climate conditions. There are four stages of weathering process in the Shicao profile that can be assigned as intensely weathering, weakening weathering, intensifying weathering, and relatively weaker weathering. Since the chemical weathering intensity of the red crust is sensitive to climate change, the geochemical parameters can be used to reconstruct the paleoclimate environment. The paleoclimate of the southern of Liaoning Province, which in the weathering period of the Shicao profile, has undergone four stages. That is hot and humid, warm and wet, return warming, relatively warm and wet.

Key words: Shicao profile, red weathering crust, major elements, chemical weathering, paleoclimate

CLC Number:

K903

Donglan Wei, Junjie Shen, Yonghua Li. Geochemical Characteristics of Red Weathering Crust from Shicao Profile in Southern Liaoning Province and the Response of Paleoclimate Evolution[J].SCIENTIA GEOGRAPHICA SINICA, 2018, 38(2): 307-313.

Figures/Tables 4

Fig.1

Table 1

Table 2

Fig.2

References 29

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编号	深度（cm）	SiO₂	Al₂O₃	Fe₂O₃	K₂O	Na₂O	CaO	MgO	TiO₂
S1	25	52.42	24.53	9.07	2.79	0.30	0.45	1.32	0.89
S2	50	55.79	22.71	8.12	2.80	0.51	0.52	1.32	0.87
S3	75	50.80	26.06	10.59	3.06	0.13	0.40	1.34	0.79
S4	100	49.72	26.48	10.79	3.25	0.11	0.41	1.35	0.85
S5	125	57.16	21.28	7.49	4.89	0.06	0.22	2.03	0.80
S6	150	53.26	24.33	9.34	3.57	0.09	0.37	1.56	0.72
S7	175	55.43	23.23	8.49	3.77	0.10	0.40	1.39	0.68
S8	200	51.39	25.74	9.26	3.75	0.11	0.42	1.53	0.71
S9	225	60.02	20.44	5.92	5.17	0.09	0.26	1.46	0.71
S10	250	57.27	21.89	6.12	5.70	0.07	0.27	1.78	0.79
S11	275	54.29	23.81	7.61	4.72	0.09	0.49	1.56	0.83
S12	300	57.62	20.18	6.83	2.90	0.73	0.65	1.34	0.78
S13	325	57.53	21.37	7.21	2.86	0.70	0.66	1.35	0.85
基岩	350	1.20	0.35	0.23	0.11	0.03	60.90	0.51	0.02
平均值		54.82	23.23	8.22	3.79	0.24	0.42	1.49	0.79

编号	深度（cm）	CIA	盐基总量淋滤系数	K/CN	S/R	S/A	S/F	A/NK	A/CNK
S1	25	85.94	3.18	3.07	2.94	3.63	15.41	6.97	5.65
S2	50	82.8	2.77	1.81	3.40	4.18	18.32	5.86	4.71
S3	75	87.43	3.39	7.76	2.63	3.31	12.79	7.37	6.11
S4	100	87.20	3.35	9.74	2.53	3.19	12.29	7.14	5.94
S5	125	79.45	1.94	26.88	3.73	4.57	20.35	3.94	3.67
S6	150	85.37	2.80	13.08	2.99	3.72	15.21	6.05	5.18
S7	175	84.01	2.72	12.43	3.29	4.06	17.41	5.46	4.66
S8	200	85.31	2.89	11.24	2.76	3.39	14.80	6.06	5.13
S9	225	77.58	2.05	18.94	4.21	4.99	27.04	3.55	3.28
S10	250	77.33	1.93	26.85	3.77	4.45	24.95	3.47	3.22
S11	275	81.46	2.35	17.30	3.22	3.88	19.02	4.52	3.86
S12	300	78.49	2.26	1.32	3.99	4.85	22.50	4.64	3.65
S13	325	79.66	2.40	1.32	3.77	4.58	21.28	5.02	3.92
基岩	350	0.316	0.003	0.001	4.118	5.795	14.22	2.251	0.003
平均值		82.464	2.618	11.672	3.325	4.062	18.567	5.388	4.537

Geochemical Characteristics of Red Weathering Crust from Shicao Profile in Southern Liaoning Province and the Response of Paleoclimate Evolution

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