Lanthanides Revealing Anthropogenic Impact within a Stratigraphic Sequence

Table 4

La/Yb_PAAS, La/Gd_PAAS, La/Sm_PAAS, Sm/Yb_PAAS (REE values normalized to REE_PAAS) and their standard deviations (±st/√ 𝑛).

SAMPLES	La/YbPAAS	±st/√ 𝑛	La/GdPAAS	±st/√ 𝑛	La/SmPAAS	±st/√ 𝑛	Sm/YbPAAS	±st/√ 𝑛
M1	3.7	0.3	2.2	0.2	1.9	0.14	0.63	0.04
M2	4.8	0.3	2.9	0.2	2.5	0.15	0.80	0.04
M3	6.031	0.10	3.65	0.06	3.06	0.05	0.88	0.02
M4	5.9	0.5	3.6	0.3	3.0	0.3	0.95	0.09
M5	4.9	0.5	3.0	0.3	2.5	0.3	0.80	0.09
M6	5.2	0.3	3.1	0.2	2.63	0.15	0.80	0.03
M7	4.3	0.2	2.62	0.09	2.20	0.08	0.73	0.04
M8	5.1	0.5	3.1	0.3	2.57	0.3	0.82	0.07
M9	4.9	0.3	2.96	0.18	2.48	0.15	0.74	0.04
M10	6.5	0.2	3.94	0.12	3.307	0.10	1.01	0.04
M11	4.66	0.09	2.82	0.05	2.37	0.04	0.73	0.02
M12	4.3	0.2	2.61	0.11	2.19	0.09	0.701	0.008
M13	6.3	0.5	3.8	0.3	3.2	0.2	0.92	0.09
M14	4.4	0.3	2.7	0.2	2.24	0.15	0.74	0.05
M15	4.8	0.4	2.9	0.3	2.4	0.2	0.81	0.08