Three generations of monazite in Austroalpine basement rocks to the south of the Tauern Window: evidence for Variscan, Permian and Eo-Alpine metamorphic events

Krenn, Erwin; Schulz, Bernhard; Finger, Fritz

doi:10.1007/s00015-012-0104-6

Swiss Journal of Geosciences

Table 1 Th, U, Pb concentration, Th* values, ages and 2 sigma errors of monazites

From: Three generations of monazite in Austroalpine basement rocks to the south of the Tauern Window: evidence for Variscan, Permian and Eo-Alpine metamorphic events

Sample	Site	Th	U	Pb	Th*	Age	±2σ (Ma)
Variscan monazite ages
520	Matrix	2.146	0.648	0.073	4.262	382	55
520	Matrix	1.807	0.582	0.057	3.701	343	63
520	Grt rim	15.494	0.561	0.258	17.318	333	13
520	Matrix	0.710	0.343	0.028	1.826	341	128
520	Grt rim	13.557	0.601	0.238	15.514	344	18
520	Grt rim	14.343	0.582	0.225	16.231	310	18
520	Grt rim	3.125	0.839	0.079	5.847	304	40
520	Grt rim	1.527	0.756	0.060	3.986	338	59
520	Grt rim	3.610	0.890	0.089	6.499	308	36
520	Matrix	10.192	0.486	0.160	11.768	305	20
520	Matrix	2.904	0.855	0.079	5.679	313	41
520	Matrix	11.916	0.561	0.191	13.738	311	17
520	Matrix	3.130	0.768	0.081	5.627	322	41
520	Matrix	9.883	0.537	0.157	11.626	302	20
520	Matrix	11.778	0.535	0.189	13.517	313	21
520	Matrix	9.347	0.565	0.167	11.183	334	21
520	Matrix	3.359	0.842	0.082	6.090	303	38
520	Matrix	3.269	0.961	0.096	6.395	339	36
520	Matrix	3.393	0.832	0.090	6.099	331	38
520	Grt rim	14.329	0.546	0.220	16.101	307	18
Weighted average age						319	10
527	Grt rim	13.190	0.510	0.205	14.844	310	19
527	Grt rim	1.253	0.702	0.050	3.533	315	66
527	Grt rim	12.684	0.482	0.193	14.247	303	20
527	Matrix	11.043	0.439	0.184	12.470	331	23
527	Matrix	12.497	0.481	0.204	14.060	324	20
527	Matrix	11.712	0.422	0.193	13.083	330	18
527	Matrix	11.971	0.440	0.196	13.401	327	21
527	Grt rim	1.735	0.749	0.056	4.165	301	56
527	Grt rim	1.288	0.695	0.051	3.547	321	66
527	Matrix	12.417	0.497	0.205	14.034	328	20
527	Grt rim	11.389	0.518	0.190	13.073	325	18
527	Grt rim	11.333	0.542	0.184	13.093	314	18
527	Grt rim	10.131	0.501	0.174	11.759	331	20
527	Matrix	11.123	0.445	0.174	12.569	311	19
527	Grt rim	2.132	0.803	0.065	4.737	306	49
527	Grt rim	11.980	0.434	0.203	13.392	340	21
Weighted average age						322	9
Alk 8	Grt rim	8.492	0.490	0.153	10.085	339	23
Alk 8	Grt rim	7.140	0.501	0.122	8.768	311	27
Alk 8	Grt rim	5.096	0.682	0.106	7.311	324	32
Alk 8	Grt rim	4.422	0.737	0.093	6.812	305	34
Alk 8	Grt rim	3.326	0.770	0.080	5.826	307	40
Alk 8	Grt rim	8.630	0.522	0.139	10.323	303	23
Alk 8	Grt rim	10.079	0.566	0.174	11.918	327	20
Alk 8	Matrix	3.484	0.882	0.090	6.349	317	37
Alk 8	Matrix	3.627	0.938	0.101	6.680	338	35
Alk 8	Matrix	3.651	0.461	0.071	5.147	311	45
Alk 8	Matrix	9.873	0.557	0.172	11.683	330	20
Alk 8	Matrix	3.988	0.475	0.084	5.534	341	42
Alk 8	Matrix	3.463	0.945	0.088	6.530	302	36
Alk 8	Matrix	9.755	0.549	0.156	11.537	302	20
Alk 8	Matrix	9.795	0.501	0.158	11.422	310	20
Alk 8	Grt rim	1.591	0.670	0.056	3.771	332	62
Weighted average age						318	10
Permian monazite ages
520	cracks	8.854	0.419	0.109	10.206	239	23
520	Grt rim	1.453	0.528	0.037	3.160	262	52
520	Matix	5.978	2.277	0.154	13.343	260	18
520	Matix	5.256	2.596	0.171	13.668	281	21
520	Matix	4.014	0.474	0.070	5.550	282	42
520	Grt rim	1.759	0.522	0.037	3.446	244	68
520	Matix	5.734	2.302	0.140	13.168	240	22
520	Grt rim	1.729	0.475	0.036	3.262	245	72
520	Matrix	3.854	0.824	0.076	6.519	264	36
520	cracks	6.297	0.408	0.086	7.615	254	31
520	cracks	9.067	0.514	0.118	10.727	246	22
520	Grt rim	0.513	1.080	0.048	4.010	270	59
520	Grt rim	0.473	0.785	0.035	3.012	264	78
520	St	3.336	0.443	0.063	4.772	296	49
520	St	1.894	0.386	0.040	3.146	286	74
520	St	1.912	0.323	0.036	2.958	272	79
520	St	2.111	0.313	0.035	3.121	251	75
520	St	2.074	0.302	0.035	3.051	256	77
520	Matrix	6.693	0.291	0.089	7.633	261	31
520	Grt rim	6.746	0.334	0.093	7.826	266	30
520	Matrix	6.594	0.360	0.098	7.759	282	30
Weighted average age						260	9
527	Matrix	1.393	1.027	0.060	4.720	285	50
527	Matrix	1.673	1.031	0.066	5.017	294	47
527	Matrix	0.987	0.577	0.029	2.850	230	82
527	Matrix	1.469	0.975	0.054	4.622	261	51
527	Matrix	1.112	1.170	0.052	4.891	238	48
527	Matrix	1.102	1.228	0.064	5.081	283	46
527	Matrix	0.936	1.158	0.051	4.677	248	50
527	Grt rim	5.006	0.722	0.082	7.338	250	32
527	Grt rim	4.912	0.787	0.080	7.455	240	31
527	Grt rim	5.060	0.796	0.101	7.640	297	31
527	Grt rim	3.098	0.882	0.074	5.955	281	39
527	Grt rim	3.058	0.904	0.072	5.982	269	39
527	Grt rim	3.905	0.682	0.064	6.107	236	38
527	Grt rim	3.177	0.400	0.053	4.472	264	52
527	Grt rim	3.270	0.439	0.052	4.688	249	50
527	Matrix	4.057	0.856	0.086	6.830	283	34
527	Matrix	3.508	0.752	0.075	5.946	284	39
527	Matrix	3.747	0.978	0.090	6.916	291	34
527	Matrix	4.083	0.868	0.086	6.895	280	34
527	Matrix	3.217	0.739	0.069	5.611	277	42
527	Matrix	3.919	0.738	0.065	6.300	232	37
527	Matrix	4.325	0.800	0.078	6.912	252	34
527	Matrix	4.379	0.856	0.079	7.144	247	33
Weighted average age						265	10
Alk 8	Grt rim	4.645	0.985	0.087	7.827	250	30
Alk 8	Grt rim	4.832	0.969	0.097	7.968	275	29
Alk 8	Grt rim	4.547	0.932	0.081	7.558	242	31
Alk 8	Grt rim	11.133	0.288	0.146	12.066	271	19
Alk 8	Grt rim	5.715	0.391	0.089	6.982	285	33
Alk 8	Grt rim	5.462	0.413	0.081	6.798	266	34
Alk 8	Grt rim	6.183	0.486	0.081	7.752	234	30
Alk 8	Grt rim	5.789	0.511	0.095	7.444	285	31
Alk 8	Grtcore	1.308	0.437	0.031	2.721	256	86
Alk 8	St	2.363	0.437	0.040	3.774	238	62
Alk 8	Matrix	1.839	0.666	0.049	3.995	276	59
Alk 8	Matrix	1.892	0.646	0.043	3.978	242	59
Alk 8	Matrix	2.154	0.659	0.049	4.286	257	42
Weighted average age						263	10
Alpine monazite ages
520	Matrix	3.729	1.296	0.039	7.875	110	26
520	Matrix	3.762	1.165	0.025	7.480	77	27
520	Matrix	3.720	1.277	0.034	7.804	98	26
520	Matrix	3.878	1.276	0.045	7.965	127	26
520	Grt rim	4.765	0.865	0.040	7.533	119	27
520	Grt rim	4.270	1.111	0.042	7.828	122	26
527	Grtcore	0.925	0.937	0.017	3.919	101	52
527	Grtcore	0.988	1.074	0.020	4.422	103	46
527	Matrix	0.919	0.935	0.021	3.912	120	52
Alk 8	Matrix	2.675	0.382	0.021	3.897	119	52
Alk 8	Matrix	3.111	0.389	0.019	4.353	96	47
Weighted average age						109	13

Th, U and Pb in wt % element;weighted average ages calculated with isoplot 2.1 (Ludwig 2001)

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