Discovery of Ordovician–Silurian metamorphic monazite in garnet metapelites of the Alpine External Aiguilles Rouges Massif

Schulz, Bernhard; von Raumer, Jürgen F.

doi:10.1007/s00015-010-0048-7

Swiss Journal of Geosciences

Table 1 Electron microprobe analyses of metamorphic monazite from mylonitic garnet gneisses and micaschists of the Col de Bérard region in the Aiguilles Rouges Massif

From: Discovery of Ordovician–Silurian metamorphic monazite in garnet metapelites of the Alpine External Aiguilles Rouges Massif

Monazite		SiO₂	P₂O₅	CaO	Y₂O₃	La₂O₃	Ce₂O₃	Pr₂O₃	Sm₂O₃	Nd₂O₃	Gd₂O₃	ThO₂	UO₂	PbO	Total	Th	U	Pb	Th*	Age (Ma)
AR-1890-Mnz2	79	0.14	30.33	1.18	2.16	13.56	27.52	3.07	1.80	12.43	1.49	5.06	0.43	0.122	99.29	4.45	0.38	0.113	5.68	446 ± 47
AR-1890-Mnz2	83	0.08	30.36	0.98	2.48	13.35	27.71	3.07	2.06	12.88	1.46	3.33	1.13	0.131	99.01	2.93	0.99	0.122	6.18	442 ± 44
AR-1890-Mnz2	86	0.08	29.92	1.12	2.41	12.95	27.25	3.08	2.04	12.71	1.60	3.85	1.35	0.158	98.51	3.39	1.19	0.147	7.29	451 ± 37
AR-1890-Mnz1	6	0.11	30.21	1.10	3.30	13.03	26.96	3.05	2.30	12.63	1.72	4.39	0.64	0.121	99.55	3.86	0.57	0.112	5.71	440 ± 47
AR-1890-Mnz1	14	0.77	30.14	1.14	0.92	13.61	28.31	3.18	2.51	14.24	1.94	2.15	0.84	0.060	99.79	1.89	0.74	0.056	4.28	295 ± 63
AR-1890-MAg2	18	0.56	29.13	0.90	1.10	14.27	27.72	3.24	2.15	12.96	1.49	3.11	0.60	0.065	97.30	2.73	0.53	0.060	4.46	302 ± 60
AR-1890-MAg2	22	0.60	30.34	1.14	1.37	13.87	28.02	3.14	2.21	12.85	1.67	4.74	0.52	0.084	100.54	4.17	0.45	0.078	5.64	310 ± 48
AR-40-Mnz2	147	0.06	30.33	1.10	0.81	12.46	27.68	3.22	2.68	14.08	1.85	4.67	0.37	0.110	99.39	4.10	0.32	0.102	5.16	442 ± 52
AR-40-Mnz2	150	1.34	29.33	1.08	2.21	10.92	24.85	3.07	2.68	13.69	2.32	4.82	0.25	0.106	96.67	4.24	0.22	0.098	4.96	442 ± 54
AR-40-MiGrt1	158	0.08	30.55	1.05	2.96	13.35	27.67	2.98	1.74	12.30	1.52	4.17	0.69	0.119	99.18	3.67	0.61	0.110	5.67	435 ± 47
AR-40-MiGrt1	162	0.11	30.51	1.10	2.80	13.25	27.34	2.98	1.54	12.34	1.50	4.31	0.76	0.130	98.66	3.78	0.67	0.121	5.99	450 ± 45
AR-40-MiGrt1	173	0.12	30.07	0.99	1.25	13.12	28.38	3.25	1.91	13.83	1.63	4.53	0.29	0.103	99.46	3.98	0.25	0.095	4.81	443 ± 56
AR-40-Mnz7	181	0.36	29.78	1.06	1.51	13.06	27.19	3.03	2.37	12.75	1.98	5.47	0.31	0.083	98.96	4.80	0.28	0.077	5.70	303 ± 47
AR-41-MiGrt14	99	0.28	30.29	0.99	0.11	14.92	30.11	2.97	1.35	12.26	1.16	5.20	0.47	0.094	100.20	4.57	0.41	0.087	5.90	331 ± 38
AR-41-MiGrt18	111	0.27	30.23	0.91	0.07	14.91	30.11	2.99	1.45	12.58	0.98	4.91	0.30	0.080	99.78	4.32	0.26	0.074	5.17	320 ± 43
AR-41-MiGrt18	112	0.26	29.42	0.87	0.10	14.82	29.68	2.95	1.61	12.14	1.10	4.50	0.31	0.078	97.84	3.96	0.27	0.073	4.84	336 ± 46
AR-41-MiGrt18	113	0.32	30.11	0.93	0.10	14.49	29.73	2.92	1.63	12.61	1.41	5.10	0.36	0.090	99.80	4.48	0.31	0.084	5.50	340 ± 41
AR-41-MiGrt18	114	0.23	30.36	0.80	0.08	15.09	30.67	3.14	1.66	12.63	1.03	4.23	0.29	0.071	100.26	3.72	0.26	0.066	4.55	323 ± 49
AR-41-MiGrt19	115	0.41	30.02	0.98	0.07	14.56	29.39	2.96	1.90	12.43	1.50	5.67	0.36	0.096	100.34	4.98	0.31	0.089	6.00	333 ± 37
AR-41-MiGrt19	116	0.23	30.36	0.72	0.08	15.08	30.94	3.06	1.70	12.91	1.32	3.80	0.30	0.067	100.56	3.34	0.26	0.062	4.20	330 ± 53
AR-1854-Mnz5	38	0.30	29.77	1.14	1.52	13.19	27.51	3.02	2.42	12.97	1.61	5.08	1.00	0.108	99.63	4.46	0.88	0.100	7.31	307 ± 31
AR-1854-MiGrt5	54	1.58	28.58	1.60	0.06	12.61	27.30	2.65	1.88	11.62	0.94	11.58	0.31	0.163	100.87	10.18	0.28	0.151	11.07	305 ± 20
AR-1854-MiGrt10	63	3.83	26.85	1.56	0.07	12.37	26.14	2.43	1.35	10.47	0.91	11.23	0.32	0.163	97.71	9.86	0.28	0.152	10.79	314 ± 21
AR-9-Mnz3	27	0.37	29.70	1.19	1.50	13.96	26.87	2.92	2.23	12.68	1.84	6.22	0.38	0.101	99.93	5.46	0.33	0.094	6.54	321 ± 34
AR-9-Mnz14	68	0.25	29.63	1.43	0.82	13.27	27.43	3.01	2.20	12.71	1.62	6.96	0.58	0.118	100.02	6.11	0.51	0.109	7.77	316 ± 29
AR-9-Mnz16	50	0.29	30.03	1.12	0.61	13.87	27.63	3.05	1.93	12.46	1.54	5.79	0.37	0.093	98.76	5.09	0.33	0.086	6.14	314 ± 36
AR-68a-Mnz2	14	0.35	30.18	1.62	1.68	12.00	26.42	2.84	2.24	11.79	1.76	7.38	1.44	0.150	99.84	6.49	1.27	0.140	10.59	296 ± 21
AR-68a-Mnz2	18	0.29	30.37	1.19	1.43	12.74	27.81	3.00	2.33	12.14	1.74	5.36	1.09	0.111	99.59	4.71	0.96	0.103	7.81	296 ± 29
AR-68a-Mnz5	41	0.48	30.59	1.31	1.23	12.55	27.63	2.87	2.29	12.20	1.63	6.18	1.00	0.126	100.09	5.43	0.88	0.117	8.29	317 ± 27
Madmon-ave50		2.80	25.74	0.14	0.99	7.69	25.14	3.70	4.51	15.61	4.51	10.67	0.41	0.256	100.04	9.38	0.36	0.238	10.56	502 ± 11

Th* is calculated from Th and U after Suzuki et al. (1994). Monazite ages from single analyses are given with 2sigma error (see text). Mnz monazite single grain; MAg satellite small monazite grains; MiGrt monazite grains enclosed in garnet. Data from reference standard monazite Madmon (Schulz et al. 2007) is mean of 50 single analyses performed during sessions on the Aiguilles Rouges samples

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