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