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

Fig.9 Geophysical characteristics and vertical stratification of weathering crust in Well Luo 1 in southern margin of Ordos Basin

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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.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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