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	S/A	S/R	A/NK	A/CNK	CIA	CIW
L1-1	2763.75	2.41	2.23	8.75	8.16	90.97	99.09
L1-2	2763.86	2.48	2.27	8.79	7.50	90.80	98.89
L1-3	2763.95	2.73	2.50	8.91	8.37	91.19	99.21
L1-4	2764.00	2.34	2.15	10.02	9.37	92.14	99.38
L1-5	2764.36	2.01	1.65	42.40	18.00	97.70	99.17
L1-6	2764.58	2.04	1.90	34.79	20.62	97.68	99.47
L1-7	2764.90	5.51	4.95	3.58	3.44	79.90	98.55
L1-8	2765.22	2.94	2.88	4.04	3.89	81.87	98.58
L1-9	2765.78	4.98	4.85	3.90	3.74	81.31	98.49
L1-10	2766.00	5.56	5.27	3.50	3.36	79.48	98.62
L1-11	2766.38	5.22	4.90	3.55	3.41	79.78	98.39
L1-12	2766.75	4.78	3.16	3.38	3.25	79.05	98.92
L1-13	2766.85	5.28	3.78	3.24	3.12	78.36	98.87
L1-14	2766.94	5.40	4.36	3.23	3.10	78.54	99.20
L1-15	2767.50	5.09	4.08	3.15	2.97	78.49	99.83
L1-16	2767.70	5.20	4.33	3.14	2.87	79.43	100.79
L1-17	2767.80	5.06	4.15	3.15	2.85	79.68	100.88
L1-18	2768.30	5.96	5.04	3.21	2.84	80.13	100.96
L1-19	2768.56	9.43	4.84	3.01	0.03	93.46	94.54
L-2	2769.10	6.21	4.85	3.19	0.12	92.06	96.63
L-1	2769.50	3.87	3.04	3.13	0.16	91.07	96.90
TY-4	2770.25	4.23	3.48	3.13	0.29	88.51	97.50
TY-3	2771.40	5.90	4.00	3.02	0.07	93.18	95.95
TY-2	2771.90	5.92	4.72	3.08	0.13	92.29	97.47
TY-1	2772.10	5.95	4.73	3.07	0.13	92.22	97.19

Table 3 Chemical weathering index 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
Table 2 Major element content of weathering crust in 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 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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