Grain-Size Control on the Rare Earth Elements Distribution in the Late Diagenesis of Cretaceous Shales from the Southern Apennines (Italy)

Table 4

The REE abundance (ppm) of the bulk sample and different fractions.

Sample	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
Bulk sample
2T	50.2	101.8	10.6	40.9	7.7	1.7	6.4	0.9	5.0	1.0	2.7	0.4	2.6	0.4
4T	47.9	98.5	11.2	43.7	8.8	2.0	7.6	1.2	6.4	1.4	3.3	0.5	3.2	0.4
6T	32.3	55.7	6.9	25.9	4.7	1.0	3.8	0.6	3.3	0.8	2.0	0.3	1.8	0.3
7T	33.3	71.0	8.1	30.4	5.4	1.1	4.4	0.7	3.7	0.8	2.2	0.4	2.4	0.4
8T	31.1	72.9	7.4	28.4	5.3	1.2	4.2	0.7	3.7	0.9	2.1	0.3	2.3	0.3
9T	51.0	107.5	12.3	47.5	8.9	1.8	7.1	1.1	6.2	1.3	3.2	0.5	3.4	0.5
Fractions
<0.1 𝜇m
2A	18.8	35.0	3.5	12.2	2.3	0.6	2.2	0.4	2.6	0.7	1.9	0.3	2.3	0.4
4A	14.6	27.0	2.8	9.6	1.7	0.4	1.6	0.3	2.3	0.6	1.5	0.3	1.5	0.2
6A	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
7A	4.4	7.3	0.7	2.3	0.4	0.1	0.5	0.1	0.6	0.2	0.4	0.1	0.5	0.1
8A	7.1	14.0	1.3	4.7	1.0	0.3	1.0	0.1	0.9	0.2	0.6	0.1	0.6	0.1
9A	7.8	14.8	1.4	4.6	0.9	0.2	1.1	0.3	2.4	0.7	2.0	0.3	2.0	0.3
(0.1–2) 𝜇m
2B	75.4	148.1	15.8	60.8	11.0	2.4	9.0	1.3	7.4	1.5	3.9	0.6	3.6	0.6
4B	73.2	143.9	15.4	61.9	12.1	2.5	9.8	1.4	8.4	1.8	4.4	0.6	3.9	0.6
6B	64.5	107.0	12.7	43.9	7.3	1.5	6.0	0.9	5.2	1.0	2.7	0.4	2.8	0.4
7B	45.4	90.6	10.0	37.5	6.6	1.3	5.0	0.7	4.3	0.9	2.5	0.4	2.9	0.4
8B	55.2	122.5	12.1	46.2	7.7	1.5	5.8	0.9	5.3	1.1	2.8	0.4	3.3	0.5
9B	83.8	167.0	18.1	70.2	12.5	2.2	8.5	1.3	8.2	1.8	4.9	0.7	5.0	0.7
(2–32) 𝜇m
2C	38.3	77.4	8.7	32.4	6.0	1.3	4.7	0.7	4.1	0.8	2.2	0.3	2.3	0.3
4C	38.2	76.7	8.7	32.8	7.4	1.7	6.5	1.0	5.3	1.1	2.6	0.4	2.5	0.4
6C	27.5	47.9	6.0	22.4	4.6	0.9	3.7	0.5	3.1	0.7	1.6	0.2	1.6	0.2
7C	27.9	56.8	6.3	24.1	4.9	1.0	4.0	0.6	3.4	0.8	2.0	0.3	2.1	0.3
8C	23.0	53.0	5.3	19.4	4.6	1.0	3.6	0.6	3.5	0.8	1.9	0.3	1.9	0.3
9C	39.3	79.1	9.2	36.4	7.5	1.6	6.3	1.0	5.1	1.0	2.6	0.4	2.3	0.3
(32–63) 𝜇m
2D	36.5	71.0	8.1	30.8	5.4	1.3	4.4	0.7	3.8	0.8	2.0	0.3	1.9	0.3
4D	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
6D	11.6	20.6	2.9	10.8	2.3	0.6	2.1	0.3	2.1	0.5	1.2	0.2	1.2	0.2
7D	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
8D	20.2	44.0	4.7	18.3	4.0	0.9	3.5	0.6	3.1	0.7	1.6	0.2	1.5	0.2
9D	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
>63 𝜇m
2E	30.1	58.6	6.6	25.0	4.5	1.0	3.6	0.5	3.1	0.7	1.6	0.3	1.6	0.2
4E	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
6E	12.9	23.9	3.2	12.9	2.8	0.7	2.8	0.4	2.5	0.6	1.5	0.2	1.3	0.2
7E	12.7	29.3	3.5	15.0	4.7	1.2	4.5	0.8	4.4	0.9	2.2	0.3	2.0	0.3
8E	16.1	37.9	3.7	13.9	2.9	0.6	2.4	0.4	2.4	0.5	1.3	0.2	1.4	0.2
9E	18.1	39.1	4.4	17.5	5.5	1.7	6.8	1.2	5.8	1.1	2.3	0.3	1.7	0.2