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 3 U–Pb isotope data on zircons from Variscan granitoids of the Sambuco and Maggia nappes, and from a gneiss block at the Tamier Pass (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 granitoids
DB77	Matorello granodiorite
1	B4-3	0.3452	255	0.0473	25	0.3583	301.1	19.2	297.9	15.4
2	B5-3	0.3562	312	0.0484	33	0.3854	309.4	23.4	304.4	20.1
3	C1-2	0.3311	298	0.0457	35	0.4217	290.4	22.7	288.2	21.4
4	C2-2	0.3506	393	0.0468	45	0.4310	305.1	29.6	294.8	27.9
5	C2-3	0.3667	231	0.0484	22	0.3643	317.2	17.2	304.9	13.7
6	C3-2	0.3649	390	0.0486	50	0.4802	315.9	29.0	305.7	30.6
7	C4-2	0.3379	310	0.0465	36	0.4180	295.6	23.5	293.3	22.0
8	C4-4	0.3443	266	0.0468	29	0.3993	300.4	20.1	295.0	17.8
9	C5-2	0.3564	334	0.0475	39	0.4333	309.5	25.0	299.2	23.8
10	C6-2	0.3230	403	0.0442	53	0.4774	284.2	30.9	279.1	32.5
11	C7-3	0.3303	270	0.0457	32	0.4217	289.8	20.6	287.9	19.4
12	C10	0.3721	270	0.0500	35	0.4765	321.2	20.0	314.5	21.3
13	C11	0.3645	144	0.0484	14	0.3777	315.6	10.7	304.9	8.9
DB19	Matorello granodiorite
1	G1	0.3648	417	0.0498	43	0.3762	315.8	62.1	313.4	52.7
2	G2	0.3439	386	0.0485	42	0.3830	300.1	58.4	305.4	51.3
3	G3-2	0.3440	567	0.0470	69	0.4464	300.2	85.6	296.4	85.2
4	G4	0.3479	405	0.0483	32	0.2804	303.1	61.0	303.9	38.8
5	G4-2	0.3596	553	0.0473	69	0.4745	311.9	82.6	297.8	84.9
6	G5	0.3802	355	0.0488	33	0.3604	327.2	52.2	307.1	40.4
7	G7	0.3602	301	0.0500	34	0.4082	312.4	45.0	314.6	42.0
8	G8	0.3493	253	0.0484	29	0.4130	304.2	38.0	304.4	35.5
9	G8-2	0.3440	353	0.0464	44	0.4597	300.2	53.4	292.6	54.1
10	H1	0.3630	553	0.0487	55	0.3734	314.5	82.6	306.8	68.4
11	H2	0.3600	363	0.0491	36	0.3622	312.2	54.4	308.8	44.2
12	H3	0.3702	360	0.0499	38	0.3902	319.8	53.5	313.7	46.6
13	H6	0.3634	410	0.0499	31	0.2779	314.8	61.3	314.0	38.6
14	H7	0.3732	489	0.0496	58	0.4496	322.0	72.5	312.1	72.0
15	H11	0.3719	277	0.0508	31	0.4030	321.1	41.2	319.6	37.6
16	H12	0.3414	385	0.0459	47	0.4571	298.2	58.4	289.4	58.5
17	I2	0.3533	161	0.0480	14	0.3254	307.2	24.2	302.3	17.6
18	I3	0.3663	319	0.0502	25	0.2825	316.9	47.4	315.9	30.4
19	I4	0.3465	466	0.0486	57	0.4398	302.1	70.2	306.0	70.7
20	I5	0.3641	590	0.0488	61	0.3852	315.3	87.8	306.9	74.9
21	I7	0.3531	500	0.0458	56	0.4323	307.1	75.1	288.7	69.2
22	I13	0.3368	286	0.0438	28	0.3725	294.8	43.4	276.3	34.2
23	I15	0.3565	426	0.0463	30	0.2712	309.6	63.8	291.5	37.0
24	I20	0.3490	493	0.0462	62	0.4774	304.0	74.3	290.9	76.8
25	I22	0.3528	331	0.0461	22	0.2538	306.8	49.7	290.3	27.1
26	I23	0.3570	361	0.0468	29	0.3039	310.0	54.0	294.6	35.4
DB30	Sassello gneiss
1	D1	0.3437	152	0.0471	13	0.3096	300.0	23.0	296.5	15.9
2	D1-2	0.3331	156	0.0464	11	0.2582	292.0	23.7	292.5	13.8
3	D2	0.3544	285	0.0472	16	0.2106	308.0	42.8	297.2	19.7
4	D4	0.3433	177	0.0479	12	0.2444	299.7	26.8	301.4	14.8
5	D6	0.3413	212	0.0477	15	0.2557	298.2	32.1	300.3	18.7
6	D7	0.3564	253	0.0470	11	0.1683	309.6	37.9	296.2	13.9
7	D8	0.3417	100	0.0470	9	0.3315	298.5	15.1	296.0	11.2
8	D8-2	0.3495	241	0.0482	14	0.2166	304.4	36.3	303.2	17.7
9	D9	0.3366	147	0.0465	12	0.2936	294.6	22.3	293.1	14.7
10	D9-2	0.3252	178	0.0474	17	0.3307	285.9	27.3	298.4	21.2
11	D10	0.3565	188	0.0474	11	0.2106	309.6	28.1	298.8	13.0
12	D11	0.3422	182	0.0462	12	0.2342	298.9	27.5	291.3	14.2
13	D11-2	0.3296	230	0.0462	21	0.3293	289.3	35.1	291.1	26.1
14	D14	0.3607	164	0.0468	13	0.3013	312.7	24.4	294.8	15.8
15	D14-2	0.3510	196	0.0484	17	0.3211	305.5	29.4	304.9	21.4
16	D15	0.3465	143	0.0471	14	0.3576	302.1	21.5	296.9	17.1
DB23	Laghetti granitic dyke
1	D2	0.3323	156	0.0458	15	0.3522	291.3	23.7	289.0	18.6
2	D4	0.3696	261	0.0502	21	0.2936	319.4	38.7	315.8	25.5
3	D5	0.3567	168	0.0479	11	0.2378	309.7	25.2	301.8	13.2
4	D5-2	0.3432	252	0.0479	17	0.2427	299.6	38.1	301.7	21.0
5	D7	0.3682	336	0.0499	21	0.2355	318.3	49.9	313.9	26.3
6	D8	0.3585	171	0.0494	21	0.4457	311.1	25.6	310.8	25.9
7	D8-2	0.3343	124	0.0463	15	0.4325	292.8	18.8	291.9	18.3
8	D8-3	0.3598	366	0.0498	37	0.3660	312.1	54.6	313.4	45.5
9	D9-2	0.3566	185	0.0479	20	0.4047	309.7	27.7	301.9	24.8
10	D11	0.3391	195	0.0468	15	0.2721	296.5	29.5	294.8	18.0
DB12	Tamier gneiss
1	D1	0.3173	169	0.0447	15	0.3163	279.8	26.1	282.2	18.6
2	D1-2	0.3503	350	0.0474	34	0.3608	305.0	52.7	298.8	42.1
3	D2	0.3247	182	0.0463	17	0.3350	285.5	28.0	291.6	21.5
4	D3	0.3030	192	0.0444	12	0.2137	268.7	29.9	280.0	14.8
5	E1	0.3248	325	0.0449	24	0.2644	285.6	49.8	282.9	29.3
6	E3	0.3349	156	0.0467	16	0.3691	293.3	23.8	294.0	19.8
DB06	Rüscada aplite
1	G2	0.3680	133	0.0498	17	0.4666	318.2	19.8	313.3	20.6
2	G5	0.3449	384	0.0451	31	0.3053	300.8	58.1	284.4	37.9
3	G6	0.3557	630	0.0476	78	0.4611	309.0	94.4	299.8	95.7
4	H3	0.3521	604	0.0477	81	0.4940	306.3	90.7	300.6	99.6
5	H17	0.3572	276	0.0477	34	0.4550	310.1	41.2	300.6	41.2
6	H19	0.3464	337	0.0459	41	0.4629	302.0	50.8	289.3	50.9
7	I1	0.3381	267	0.0454	33	0.4584	295.7	40.5	286.5	40.6
8	I1	0.3521	248	0.0473	31	0.4643	306.3	37.2	298.0	38.1
9	I32	0.3831	344	0.0498	35	0.3906	329.3	50.6	313.2	42.9
10	I34	0.3871	511	0.0536	69	0.4843	332.3	74.8	336.8	83.9
11	I36	0.3255	196	0.0446	25	0.4643	286.1	30.1	281.5	30.9
DB44	Cocco granodiorite
1	G2	0.3505	527	0.0494	39	0.2644	305.1	79.2	311.0	48.3
2	G2-2	0.3518	248	0.0484	22	0.3183	306.1	37.4	304.9	26.8
3	G3	0.3692	370	0.0497	33	0.3330	319.1	54.9	312.4	40.7
4	G3-2	0.3689	423	0.0494	45	0.3943	318.8	62.7	310.9	54.8
5	G4	0.3562	346	0.0489	23	0.2456	309.4	51.8	307.9	28.7
6	G4-2	0.3510	317	0.0492	31	0.3504	305.5	47.7	309.7	38.3
7	G5-2	0.3618	329	0.0488	37	0.4139	313.6	49.1	307.2	45.2
8	G6	0.3821	284	0.0506	25	0.3284	328.6	41.7	317.9	30.3
9	G7	0.3458	324	0.0474	26	0.2915	301.5	48.8	298.3	31.8
10	G7-2	0.3322	508	0.0467	37	0.2579	291.3	77.5	294.2	45.4
11	G8	0.3635	493	0.0486	59	0.4441	314.8	73.5	305.7	72.0
12	G8-2	0.3720	321	0.0491	21	0.2472	321.1	47.6	308.8	25.8
13	G9	0.3464	283	0.0482	33	0.4183	302.0	42.6	303.4	40.5
14	G9-2	0.3354	463	0.0465	45	0.3493	293.7	70.4	293.2	55.3
15	G10	0.3501	327	0.0474	38	0.4327	304.8	49.2	298.4	47.1
16	G11	0.3665	384	0.0494	24	0.2280	317.1	57.0	311.0	29.0
17	G11-2	0.3559	435	0.0482	50	0.4258	309.1	65.1	303.3	61.6
18	G12	0.3464	337	0.0482	34	0.3636	302.0	50.8	303.5	42.0
19	G12-2	0.3577	343	0.0489	20	0.2147	310.5	51.3	307.9	24.7
20	G13	0.3358	313	0.0459	36	0.4236	294.0	47.6	289.2	44.7
21	G14	0.3772	343	0.0513	40	0.4285	325.0	50.6	322.2	49.0
22	G14-2	0.3621	407	0.0490	42	0.3769	313.8	60.7	308.5	51.1
23	G15-2	0.3680	311	0.0504	35	0.2676	318.2	46.0	317.2	24.0
24	H2	0.3567	338	0.0481	41	0.4537	309.7	50.7	302.8	50.9
25	H4	0.3517	387	0.0489	36	0.3384	306.0	58.2	308.1	44.9
26	H6	0.3690	527	0.0497	37	0.2640	318.9	78.2	312.9	46.1
27	H7	0.3482	323	0.0485	34	0.3729	303.4	48.7	305.1	41.2

Errors refer to last significant digits

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