Research Article
Geochemical Mass Balance and Elemental Transport during the Weathering of the Black Shale of Shuijingtuo Formation in Northeast Chongqing, China
Table 4
Mass fluxes (mol/m2) of major elements in three profiles.
| Materials | Depth (m) | Si | Al | Fe | K | Na | Ca | Mg |
| Profile A | | | | | | | | | Regolith | 0~0.25 | 285 | 47 | −45 | 0 | 7 | −191 | −100 | Saprock | 0.25~1.5 | 334 | −57 | −563 | −44 | −10 | −662 | −476 | Weathered rock | 1.5~3.0 | 194 | −167 | −433 | −78 | −82 | 815 | −349 | | 0~3.0 | 813 |
−177 | −1041 | −122 | −85 | −38 | −925 | Profile B | | | | | | | | | Regolith | 0~2.0 | −723 | −65 | −1 | −84 | −506 | −762 | −129 | Saprock | 2.0~4.8 | −8750 | −19 | −17 | −22 | −536 | −1984 | −155 | Weathered rock | 4.8~7.0 | −13312 | −91 | −180 | −90 | −280 | −1483 | −1 | | 0~7.0 | −22785 | −175 | −198 | −196 | −1322 | −4229 | −285 | Profile C | | | | | | | | | Regolith | 0~1.5 | −10156 | 207 | −674 | −119 | −94 | −11479 | −2141 | Saprock | 1.5~6.2 | −29304 | 1499 | −615 | 66 | −280 | −34617 | −6840 | Weathered rock | 6.2~10.5 | −19906 | −173 | −497 | −185 | −174 | −19043 | −4169 | | 0~10.5 | −59366 | 1533 | −1786 | −238 | −548 | −65139 | −13150 |
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