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

地质时代	采样点	古纬度/(°)	资料来源
P₁	内蒙古地区	5.4	李朋武等,2012
P₁	内蒙古地区	15.0	李朋武等,2012
P₁	华北板块	18.0	吴汉宁等,1993
P₁	华北板块	37.0	林万智等,1984
P₁	华北板块	5.3	马醒华等,1992
P₁	华北板块	28.5	李永安等,2004
C₂	陕西韩城	9.6	吴汉宁等,1990
C₃	太原西山	-8.4	林万智等,1984
C₂	太原西山	9.8	林万智等,1984
C₂	内蒙古阿左旗	19.6	黄宝春等,1994
C₂	太原西山	37.2	马醒华,1984
C_1-2	华北板块北部	7.0±5.2	任收麦等,2002
C₁	华北板块	10.1	吴汉宁等,1990
C₁	华北板块	9.2	吴汉宁等,1993
C₁	华北板块北部	19±16	任收麦等,2002
C₁	内蒙古地区	1.4	李朋武等,2012
O₂	鄂尔多斯	-14.4	黄宝春和朱日祥,1996
O₂	河南焦作	-22.6	杨振宇等,1997
O₂	华北陆块	-2.7±5.5	林万智等,1984
O₂	华北陆块	-24.2±7.6	杨振宇等,1998
O₂	华北陆块	-14.7±4.4	杨振宇等,1999
O_1-2	华北陆块	-23.2±10.3	孟自芳,1992
O_1-2	华北陆块	-14.9±6.1	黄宝春等,2000

Table 4 Statistics on paleolatitude data of North China Plate during the Ordovician-Permian

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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.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 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

模态框（Modal）标题

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