Timing of Palaeozoic magmatism in the Maggia and Sambuco nappes and paleogeographic implications (Central Lepontine Alps)

Bussien, Denise; Bussy, François; Magna, Tomas; Masson, Henri

doi:10.1007/s00015-010-0049-6

Swiss Journal of Geosciences

Table 4 U–Pb isotope data on zircons from Variscan lamprophyres (LA-ICPMS, Univ. Lausanne)

From: Timing of Palaeozoic magmatism in the Maggia and Sambuco nappes and paleogeographic implications (Central Lepontine Alps)

Spot	Analyse number	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	Rho	²⁰⁷Pb/²³⁵U apparent age (Ma)	±2σ	²⁰⁶Pb/²³⁸U apparent age (Ma)	±2σ
Variscan lamprophyres
DB76	Laghetti lamprophyre
1	A1	0.3368	137	0.0470	15	0.3995	294.8	10.4	296.4	9.4
2	A1-4	0.3379	639	0.0456	76	0.4386	295.6	48.5	287.7	46.7
3	A2	0.3543	292	0.0486	31	0.3813	307.9	21.9	305.9	18.8
4	A2-2	0.3835	485	0.0493	51	0.4082	329.6	35.6	310.1	31.3
DB29	Sassello lamprophyre
1	D1	0.3575	263	0.0475	27	0.3851	310.3	39.3	299.0	33.1
2	D2	0.3395	161	0.0470	11	0.2478	296.8	24.4	296.0	13.6
3	D2-2	0.3389	285	0.0474	16	0.1959	296.4	43.2	298.7	19.2
4	D3	0.3343	114	0.0459	12	0.3938	292.9	17.4	289.3	15.2
5	D3-2	0.3512	131	0.0460	12	0.3513	305.6	19.7	290.2	14.9
6	D4	0.3352	150	0.0463	12	0.2976	293.5	22.8	292.1	15.2
7	E1	0.3451	128	0.0485	11	0.2974	301.0	19.3	305.4	13.2
8	E3-2	0.3576	294	0.0494	21	0.2552	310.4	44.0	310.8	25.5
9	E4-2	0.3468	195	0.0485	12	0.2206	302.3	29.3	305.6	14.8
10	E5	0.3312	248	0.0473	26	0.3604	290.5	37.8	298.0	31.4
11	E5-2	0.3198	288	0.0447	18	0.2237	281.7	44.4	281.9	22.3
12	E6	0.3312	134	0.0464	11	0.3028	290.5	20.4	292.1	14.0
13	E7	0.3456	400	0.0481	24	0.2187	301.4	60.4	302.7	30.0
14	E7-2	0.3489	329	0.0478	24	0.2709	303.9	49.5	300.9	30.0
15	E9	0.3355	403	0.0485	18	0.1565	293.8	61.2	305.5	22.4
DB41	Tamier lamprophyre
1	A3	0.3385	589	0.0483	61	0.3648	296.0	89.4	304.2	75.5
2	A3-2	0.3372	455	0.0471	39	0.3102	295.0	69.1	296.4	48.5
3	A4-2	0.3361	217	0.0457	19	0.3191	294.2	33.0	288.4	23.3
4	A5	0.3345	396	0.0467	27	0.2474	293.0	60.2	294.2	33.7
5	A6	0.3312	441	0.0458	47	0.3842	290.5	67.3	288.5	57.7
6	A6-2	0.3272	665	0.0458	62	0.3315	287.4	101.8	288.6	76.1
7	A7	0.3576	401	0.0488	23	0.2100	310.4	60.0	307.1	28.3
8	A7-2	0.3186	384	0.0441	34	0.3242	280.8	59.1	278.4	42.6
9	A7-3	0.3332	337	0.0463	26	0.2798	292.0	51.3	291.5	32.3
10	A9	0.3234	542	0.0455	50	0.3291	284.5	83.2	286.7	61.9
11	A11	0.3537	358	0.0468	28	0.2965	307.5	53.6	294.9	34.6
12	A14	0.3586	392	0.0486	17	0.1639	311.2	58.6	306.2	21.4
13	C1	0.3266	231	0.0454	15	0.2401	287.0	35.4	286.0	19.0
14	C1-2	0.3184	395	0.0449	39	0.3481	280.6	60.9	283.0	47.9
15	C2	0.3229	215	0.0447	11	0.1842	284.1	33.0	281.7	13.5
16	C3	0.3341	281	0.0442	13	0.1760	292.7	42.7	279.0	16.1
17	C3-2	0.3353	409	0.0448	23	0.2068	293.6	62.2	282.2	27.9
DB42	Tamier lamprophyre
1	A2	0.3299	210	0.0452	13	0.2302	289.5	32.1	284.8	16.4
2	A3-2	0.3086	386	0.0448	46	0.4090	273.1	59.9	282.8	56.6
3	A4-2	0.3379	453	0.0467	47	0.3730	295.6	68.7	294.1	57.5
4	A5	0.3235	235	0.0447	30	0.4550	284.6	36.0	282.0	36.4
5	A7	0.3283	250	0.0449	28	0.4145	288.3	38.2	283.3	35.0
6	C1-2	0.3394	179	0.0461	20	0.4210	296.7	27.1	290.7	25.2
7	C1-3	0.3274	233	0.0463	28	0.4226	287.6	35.7	291.7	34.4
8	C1-4	0.3319	571	0.0458	76	0.4819	291.0	87.1	288.8	93.7

Errors refer to last significant digits

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