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

Table 1

Mineralogical composition of the bulk sample and different fractions.

Sample	Qtz	Feld	Cal	Dol	Hem	I/S	Ill	Chl	Kao
Bulk sample
2T	12	1	tr	0	0	50	5	20	12
4T	11	1	tr	1	0	62	2	11	12
6T	14	7	24	3	0	30	4	14	4
7T	14	3	2	0	tr	58	12	11	tr
8T	18	1	0	0	1	40	6	12	22
9T	14	1	2	0	tr	46	1	15	21
Fractions
<0.1 𝜇m
2A	0	0	0	0	0	100	0	0	tr
4A	0	0	0	0	0	100	0	0	tr
6A	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
7A	0	0	0	0	0	100	0	0	0
8A	0	0	0	0	0	100	0	0	0
9A	0	0	0	0	0	100	0	0	tr
(0.1–2) 𝜇m
2B	4	tr	0	0	0	62	3	14	17
4B	7	tr	1	0	0	74	1	6	11
6B	6	tr	11	0	0	56	3	21	3
7B	3	1	0	0	0	82	7	6	1
8B	7	tr	0	0	4	58	2	15	14
9B	3	tr	0	0	0	51	5	19	21
(2–32) 𝜇m
2C	18	2	0	0	0	37	6	28	10
4C	18	3	1	0	tr	37	2	20	18
6C	16	6	25	4	tr	21	12	9	6
7C	23	5	0	0	1	34	16	20	1
8C	31	5	0	0	1	15	6	9	33
9C	27	2	0	3	0	22	2	13	31
(32–63) 𝜇m
2D	20	3	0	0	0	26	7	35	9
4D	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
6D	15	10	51	7	0	tr	5	5	7
7D	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
8D	27	8	0	0	0	18	3	20	24
9D	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
>63 𝜇m
2E	21	2	2	0	0	0	2	60	13
4E	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
6E	18	3	64	0	0	0	0	14	0
7E	41	5	23	0	0	0	0	30	0
8E	24	3	2	0	0	0	9	30	32
9E	24	tr	43	0	0	0	0	14	19

Qtz: quartz; Feld: K-feldspar + plagioclase; Cal: calcite; Dol: dolomite; Hem: hematite; I/S: illite-smectite mixed layers; Ill: illite and/or muscovite; Chl: chlorite; Kao: kaolinite and dikite; n.a.: not analysed; tr: trace.