Pressure-temperature conditions and significance of Upper Devonian eclogite and amphibolite facies metamorphisms in southern French Massif central

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Table 1

Results of U-Pb zircon dating on leucogneiss sample AJAH09.

Sample		Pb* (ppm)	Th (ppm)	U (ppm)	Th/U	²⁰⁷Pb/²⁰⁶Pb ratio	±2σ	²⁰⁷Pb/²³⁵U ratio	±2σ	²⁰⁶Pb/²³⁸U ratio	±2σ	Rho	²⁰⁷Pb/²³⁵U age	±2σ	²⁰⁶Pb/²³⁸U age	±2σ	Disc (%)
ab2	Rim	56	27	1044	0.03	0.0576	0.0021	0.455	0.015	0.0573	0.0011	0.57	381	10	359	7	6
ab7	Rim	31	18	572	0.03	0.0556	0.0025	0.449	0.018	0.0586	0.0012	0.51	377	13	367	7	3
ab8	Rim	36	21	674	0.03	0.0546	0.0024	0.440	0.017	0.0584	0.0012	0.53	370	12	366	7	1
ab21	Rim	32	17	616	0.03	0.0558	0.0027	0.443	0.019	0.0577	0.0013	0.51	373	14	362	8	3
ab26	Rim	25	8	476	0.02	0.0550	0.0029	0.449	0.022	0.0592	0.0014	0.49	377	15	371	8	2
ac_5	Rim	32	20	472	0.04	0.0581	0.0024	0.479	0.019	0.0597	0.0015	0.63	397	13	374	9	6
ac_6	Rim	39	21	564	0.04	0.0633	0.0028	0.511	0.021	0.0586	0.0015	0.63	419	14	367	9	14
ac_7	Rim	27	17	424	0.04	0.0611	0.0029	0.478	0.021	0.0568	0.0015	0.60	397	15	356	9	11
ac_9	Rim	48	18	703	0.03	0.0629	0.0029	0.502	0.022	0.0579	0.0015	0.61	413	15	363	9	14
ab1	Core	127	23	3123	0.01	0.129	0.004	0.678	0.016	0.0381	0.0007	0.72	526	10	241	4	118
ab4	Core	100	160	4302	0.04	0.060	0.002	0.194	0.006	0.0233	0.0004	0.58	180	5	148	3	21
ab11	Core	102	27	4268	0.01	0.053	0.002	0.184	0.006	0.0253	0.0005	0.57	171	5	161	3	6
ab12	Core	82	5	645	0.01	0.269	0.010	2.888	0.088	0.0777	0.0019	0.79	1379	23	483	11	186
ab13	Core	250	12	1598	0.01	0.493	0.014	7.296	0.175	0.1074	0.0019	0.74	2148	21	658	11	227
ab14	Core	299	13	2350	0.01	0.323	0.010	3.278	0.081	0.0737	0.0013	0.73	1476	19	458	8	222
ab15	Core	64	6	662	0.01	0.184	0.006	1.804	0.052	0.0713	0.0015	0.71	1047	19	444	9	136
ab16	Core	106	16	3126	0.01	0.118	0.005	0.541	0.018	0.0334	0.0007	0.64	439	12	212	4	107
ab19	Core	46	9	691	0.01	0.084	0.004	0.782	0.030	0.0676	0.0015	0.58	586	17	421	9	39
ab20	Core	58	6	855	0.01	0.072	0.003	0.723	0.028	0.0733	0.0016	0.57	552	16	456	10	21
ab22	Core	161	14	2613	0.01	0.056	0.002	0.544	0.019	0.0703	0.0014	0.57	441	12	438	8	1
ab24	Core	105	34	4653	0.01	0.074	0.003	0.239	0.008	0.0236	0.0005	0.59	218	7	150	3	45
ab25	Core	22	4	314	0.01	0.108	0.005	0.961	0.042	0.0643	0.0017	0.59	684	22	402	10	70
ab29	Core	114	74	3555	0.02	0.060	0.003	0.214	0.011	0.0261	0.0007	0.50	197	9	166	4	19
ab30	Core	66	4	964	0.00	0.109	0.005	1.012	0.038	0.0672	0.0015	0.59	710	19	419	9	69
ab32	Core	139	15	1656	0.01	0.237	0.009	1.777	0.061	0.0544	0.0011	0.61	1037	22	341	7	204
ab33	Core	110	10	1875	0.01	0.072	0.003	0.681	0.027	0.0684	0.0015	0.55	528	16	427	9	24
ab34	Core	123	43	4198	0.01	0.103	0.005	0.393	0.016	0.0278	0.0007	0.58	336	12	176	4	91
ab35	Core	71	24	3585	0.01	0.069	0.003	0.200	0.009	0.0211	0.0005	0.52	185	7	135	3	37

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