Growth mechanisms and environmental implications of carbonate concretions from the ~ 1.4 Ga Xiamaling Formation, North China

Journal of Palaeogeography

Table 1 Carbon and oxygen isotopes of carbonate concretions from the Member IV of Xiamaling Formation (Zhaojiashan and Huangtugang sections)

Serial No.	Sample ID	Thickness (m)	Section	δ¹³C (VPDB‰)	δ¹⁸O (VPDB‰)
No. 01	ZJS-24-3-1a	1.2	ZJS	0.8	−9.4
No. 02	ZJS-24-3-1b	1.2	ZJS	0.0	−10.0
No. 03	ZJS-24-3-1c	1.2	ZJS	1.3	−5.9
No. 04	ZJS-24-7-1a	2.3	ZJS	0.9	−8.9
No. 05	ZJS-24-7-1b	2.3	ZJS	0.9	−6.7
No. 06	ZJS-24-9-1a	2.5	ZJS	1.5	−5.1
No. 07	ZJS-24-9-1b	2.5	ZJS	1.2	−6.7
No. 08	ZJS-24-11-1	2.6	ZJS	0.9	−8.5
No. 09	ZJS-24-15-1	3.1	ZJS	−0.3	−9.5
No. 10	ZJS-24-15-2	3.1	ZJS	0.7	−5.6
No. 11	ZJS-24-19-1	3.7	ZJS	0.2	−8.1
No. 12	ZJS-24-21-1a	3.8	ZJS	−0.4	−10.0
No. 13	ZJS-24-23-1	4.4	ZJS	0.3	−8.9
No. 14	ZJS-24-25-1	4.5	ZJS	1.1	−8.1
No. 15	ZJS-24-J	5.6	ZJS	1.0	−4.8
No. 16	1704HTG-3	1.5	HTG	−0.7	−7.5
No. 17	1704HTG-4	2	HTG	−0.6	−8.4
No. 18	1704HTG-6	3	HTG	0.6	−5.2
No. 19	1704HTG-8	4	HTG	−0.4	−7.0
No. 20	1704HTG-9	4.5	HTG	−1.7	−8.7
No. 21	1704HTG-10	5	HTG	0.8	−4.9
	Min			−1.7	−10.0
	Max			1.5	−4.8
	Average			0.4	−7.5