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Accueil Tous les numéros Volume 189 / Numéro 4-6 (2018) BSGF - Earth Sci. Bull., 189 4-6 (2018) 16 Full HTML
Open Access

Table 1

Sample details and results including sampling locality, WGS84 projection system coordinates, elevation, stratigraphic age and lithology.

Code Locality Lat Long Elevation (m) Stratigraphic age (Ma) Lithology n ρs Ns ρi Ni ρd Nd P (χ2) % ± 1 σ (Ma) Central age N MTL ± 1SE (μm) SD (μm) Dpar± 1σ (μm) Cl content
Ox. Wt (%)
BEL1 Fauquez 50.626 4.218 85 Ashgill Dacite 37 0.334 478 0.192 274 5.31 16140 > 99 150 ± 12 12 13.3 ± 0.4 1.3 1.0 ± 0.1 0.2
BEL12 Lessines 50.713 3.867 35 Lower Silurian Porphyre 14 0.553 213 0.242 93 5.31 16140 > 99 195 ± 25 9 13.8 ± 0.3 0.9 1.2 ± 0.1
BEL13 Quenast 50.665 4.160 28 Caradoc Porphyre 24 0.467 342 0.281 206 5.23 16140 > 99 140 ± 13 22 12.6 ± 0.2 1.1 1.1 ± 0.1
BEL26 Colfontaine 50.385 3.845 121 Lochkovian Sandstone 23 0.574 467 0.231 188 5.26 16140 97 209 ± 19 – – – 1.3 ± 0.1
BEL27 Sosoye 50.300 4.795 190 Visean Ash-bed 20 2.394 953 0.902 359 5.24 16140 99 223 ± 15 20 13.2 ± 0.3 1.3 1.5 ± 0.2
BEL28 Walhorn 50.671 6.504 285 Visean Ash-bed 31 2.043 1277 0.806 504 5.29 16140 49 213 ± 14 103 12.9 ± 0.1 1.4 1.6 ± 0.2
BEL29 Lives 50.469 4.921 115 Visean Ash-bed 9 1.907 225 0.881 104 5.43 16173 > 99 188 ± 23 – – – 1.6 ± 0.1
BEL30 Saint-Servais 50.478 4.853 140 Visean Ash-bed 21 2.117 794 1.003 376 5.49 16140 64 186 ± 14 12 12.8 ± 0.1 1.8 1.2 ± 0.1
BEL31 Monceau-sur-Sambre 50.398 4.379 120 Visean Ash-bed 7 1.031 135 0.473 62 5.28 16140 28 181 ± 32 – – – 1.7 ± 0.2
BEL32 Maizeret 50.464 4.999 105 Visean Ash-bed 12 0.859 164 0.503 96 2.35 16140 59 147 ± 20 – – – 1.5 ± 0.2
BEL33 Royseux 50.466 5.275 200 Visean Ash-bed 34 2.4 1812 1.042 787 5.45 16140 56 201 ± 11 85 13.4 ± 0.1 1.2 1.4 ± 0.1
BEL34 Frasnière 50.434 4.738 155 Visean Ash-bed 22 0.821 482 0.296 174 5.56 16140 > 99 246 ± 23 29 13.8 ± 0.2 0.9 1.7 ± 0.2 1.3
BEL35 Anhée Nord 50.317 4.876 105 Visean Ash-bed 28 2.339 1097 0.761 357 5.27 16140 85 258 ± 18 24 13.7 ± 0.2 0.9 1.6 ± 0.1
BEL36 Anhée Sud 50.294 4.894 115 Visean Ash-bed 18 1.746 618 0.644 228 5.22 16140 54 226 ± 19 20 13.7 ± 0.2 0.9 2.2 ± 0.2 2.0
BEL37 Landelies 50.394 4.3368 120 Visean Ash-bed 12 2.602 851 1.037 339 5.3 16140 77 213 ± 15 102 13.5 ± 0.1 1.1 1.3 ± 0.1
BEL38 Engihoul 50.576 5.421 160 Visean Ash-bed 30 2.982 2213 1.164 864 5.38 16140 14 196 ± 11 100 13.5 ± 0.2 1.5 1.6 ± 0.2 0.7
BEL39 Seilles 50.496 5.488 90 Visean Ash-bed 23 1.957 1059 1.091 590 5.21 16140 69 152 ± 9 102 13.3 ± 0.1 1.2 1.6 ± 0.1 0.7
BEL41 Anzin 50.384 3.634 −745 Upper Carboniferous Ash-bed 24 1.153 534 0.847 392 5.17 16140 85 114 ± 8 10 13.4 ± 0.4 1.1 1.1 ± 0.1
BEL49 Couvin 50.723 4.511 171 Frasnian Ash-bed 21 0.62 264 0.197 84 5.2 16173 91 261 ± 33 – – – 1.3 ± 0.1

n: number of apatite crystals counted; s, i and d subscripts denote spontaneous, induced and dosimeter; ρ: track density (×105 tracks/cm2); N: number of tracks counted; P(χ2): probability of obtaining Chi-square value (χ2) for n degrees of freedom (where n = number of crystals – 1); Age ± 1σ – central age ± 1 standard error (Galbraith and Laslett, 1993); MTL: mean track length (μm); SD: standard deviation of track length distribution (μm); N(L): number of horizontal confined tracks measured; Dpar: average etch pit diameter parallel to c. Ages were calculated using the zeta calibration method (Hurford and Green, 1983), glass dosimeters CN-5, and a zeta value of 325 ± 4 (IB).

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