Journal of Palaeogeography

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Characteristics and genetic mechanism of weathering crust on carbonate rocks on the top of the Ordovician in southern margin of Ordos Basin

Jiabei XIONG, Dengfa HE, Xiang CHENG, Yufeng LUO

J Palaeogeogr, 2024, 26(1): 100-118. DOI: 10.7605/gdlxb.2024.01.005

样品名称	深度/m	含量/%
		SiO₂	TiO₂	Al₂O₃	Fe₂O₃	MgO	CaO	Na₂O	K₂O	FeO
L1-1	2763.75	45.52	1.895	32.157	4.09	0.88	0.15	0.32	2.91	0.94
L1-2	2763.86	45.33	1.659	31.016	4.59	0.96	0.33	0.29	2.82	0.88
L1-3	2763.95	48.08	1.800	29.908	4.46	0.78	0.12	0.29	2.67	0.80
L1-4	2764.00	44.39	1.700	32.290	4.45	0.86	0.12	0.27	2.57	0.60
L1-5	2764.36	13.93	0.193	11.771	4.09	0.14	0.21	0.05	0.18	—
L1-6	2764.58	15.22	0.173	12.701	1.45	0.16	0.14	0.07	0.24	—
L1-7	2764.90	62.41	1.235	19.262	3.43	1.02	0.12	0.25	4.58	0.96
L1-8	2765.22	51.60	2.003	29.827	1.03	1.18	0.16	0.41	6.20	0.56
L1-9	2765.78	63.60	1.655	21.717	0.92	0.79	0.13	0.31	4.68	0.46
L1-10	2766.00	65.26	1.321	19.964	1.71	1.09	0.13	0.25	4.90	0.62
L1-11	2766.38	62.93	1.266	20.493	2.07	1.05	0.13	0.30	4.88	0.68
L1-12	2766.75	46.53	0.780	16.564	13.31	1.16	0.10	0.19	4.24	2.25
L1-13	2766.85	51.67	0.753	16.627	10.38	1.38	0.11	0.20	4.43	1.65
L1-14	2766.94	56.67	0.845	17.843	6.67	1.55	0.13	0.21	4.78	1.45
L1-15	2767.50	54.73	0.920	18.293	7.07	1.57	0.19	0.19	5.08	1.50
L1-16	2767.70	56.57	0.904	18.494	5.86	1.72	0.31	0.22	5.12	1.15
L1-17	2767.80	56.27	0.892	18.886	6.57	1.68	0.35	0.23	5.18	1.15
L1-18	2768.30	60.88	0.914	17.354	5.01	1.62	0.39	0.22	4.67	1.10
L1-19	2768.56	7.29	0.071	1.315	1.96	17.79	28.61	0.04	0.35	1.22
L-2	2769.10	18.44	0.172	5.046	2.22	15.06	21.65	0.09	1.33	1.05
L-1	2769.50	14.97	0.409	6.571	2.81	15.28	21.08	0.11	1.78	1.00
TY-4	2770.25	24.48	0.530	9.842	3.32	12.33	16.74	0.13	2.72	0.90
TY-3	2771.40	10.87	0.199	3.130	2.34	16.70	25.60	0.07	0.86	1.05
TY-2	2771.90	19.83	0.282	5.693	2.27	12.89	22.69	0.07	1.60	0.85
TY-1	2772.10	19.38	0.266	5.538	2.25	13.06	23.10	0.08	1.55	0.80

Table 2 Major element content of weathering crust in Well Luo 1 in southern margin of Ordos Basin

Other figure/table from this article

Fig.1 Regional geological schematic diagram of southern margin of Ordos Basin and Location of Well Luo 1
Fig.2 Core lithological histogram and sampling site of weathering crust from Well Luo 1 in southern margin of Ordos Basin
Fig.3 Core photos of the Benxi-Majiagou Formations in Well Luo 1 in southern margin of Ordos Basin
Fig.4 Microscopic photos of core sampling for aluminum bearing rock series in the Benxi Formation of Well Luo 1 in southern margin of Ordos Basin
Fig.5 Microscopic photos of core sampling of the Majiagou Formation dolostone series in Well Luo 1 in southern margin of Ordos Basin
Table 1 Quantitative analysis of weathering crust and bedrock of Well Luo 1 in southern margin of Ordos Basin by X-ray diffraction whole rock method
Fig.6 Energy spectrum of illite from the Benxi Formation sample of Well Luo 1 in southern margin of Ordos Basin
Fig.7 Variation of major elements in weathering crust of Well Luo 1 in southern margin of Ordos Basin
Fig.8 Geochemical characteristics of refractory elements in weathering profile of Well Luo 1 in southern margin of Ordos Basin
Fig.9 Geophysical characteristics and vertical stratification of weathering crust in Well Luo 1 in southern margin of Ordos Basin
Fig.10 Mass transfer coefficient of major elements with Ti as a reference in weathering profile of Well Luo 1 in southern margin of Ordos Basin
Fig.11 Scatterplot of content and weathering trend of different elements in weathering profile of Well Luo 1 in southern margin of Ordos Basin
Fig.12 Scatter plot of Ti/Zr and Ti content in weathering crust in Well Luo 1 in southern margin of Ordos Basin,as well as Hf-Zr,Nb-Ta,and Sm-Nd variation diagrams
Table 3 Chemical weathering index of weathering crust in Well Luo 1 in southern margin of Ordos Basin
Table 4 Statistics on paleolatitude data of North China Plate during the Ordovician-Permian
Table 5 Paleoclimatic indicators
Fig.13 Intersection diagram of Sr/Ba and Sr/Cu in Well Luo 1 in southern margin of Ordos Basin
Table 6 Formation temperature of diaspora and kaolinite in bauxite
Fig.14 Schematic diagram of formation process of weathered crust on the top of Ordovician in southern margin of Ordos Basin

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