Nova Terra 52

478 International Journal of Earth Sciences (2021) 110:467–485 13 Table 3 Whole rock Nd isotope data of Montemolín and Tentudía Fms. (Late Ediacaran) MO Montemolín Fm. of the Serie Negra (Ossa-Morena Complex), TE Tentudía Fm. of the Serie Negra (Ossa-Morena Complex) a ε Nd ( T ) calculated for 600 and 565 Ma at the Montemolín and Tentudía Fm., respectively b Nd model ages after DePaolo (1981) Decay constant for 147 Sm: 6.54×10 –12 years −1 (Lugmair and Marti 1978) Present-day CHUR parameters: 147 Sm/ 144 Nd=0.1967; 143 Nd/ 144 Nd=0.512638 (Jacobsen and Wasserburg 1980) Sample Sm Nd 147 Sm/ 144 Nd f Sm/Nd 143 Nd/ 144 Nd ±StErr*10 –6 εNd (0) εNd (T) a T DM(Ma) b MO-1 4.95 26.78 0.1117 −0.432 0.511799 1 −16.4 −9.9 1859 MO-2 5.56 30.36 0.1106 −0.438 0.511764 1 −17.1 −10.5 1892 MO-3 5.25 27.59 0.1151 −0.415 0.511911 2 −14.2 −7.9 1747 MO-4 5.24 28.70 0.1104 −0.439 0.511792 1 −16.5 −9.9 1846 MO-5 5.10 26.21 0.1176 −0.402 0.511929 2 −13.8 −7.8 1765 MO-7 5.22 27.70 0.1138 −0.421 0.511863 1 −15.1 −8.8 1799 MO-8 4.79 24.32 0.1191 −0.395 0.511942 1 −13.6 −7.6 1772 MO-9 5.00 25.85 0.1168 −0.406 0.511860 1 −15.2 −9.1 1860 MO-10 5.79 31.04 0.1128 −0.426 0.511843 1 −15.5 −9.1 1811 MO-11 5.25 27.53 0.1154 −0.414 0.511902 1 −14.4 −8.1 1767 TE-01 4.26 19.88 0.1296 −0.341 0.512038 1 −11.7 −6.9 1819 TE-02 3.91 19.01 0.1242 −0.368 0.512012 1 −12.2 −7.0 1753 TE-03 4.43 22.46 0.1191 −0.395 0.511870 1 −15.0 −9.4 1889 TE-04 4.19 21.56 0.1175 −0.403 0.511832 1 −15.7 −10.0 1918 TE-05 3.91 20.75 0.1139 −0.421 0.511937 1 −13.7 −7.7 1686 TE-06 4.21 21.76 0.1168 −0.406 0.511827 1 −15.8 −10.1 1913 TE-07 4.46 22.95 0.1175 −0.403 0.511868 1 −15.0 −9.3 1861 TE-08 5.18 27.69 0.1130 −0.425 0.511789 1 −16.6 −10.5 1898 TE-09 5.60 29.84 0.1134 −0.424 0.511833 1 −15.7 −9.7 1837 TE-10 5.16 29.76 0.1049 −0.467 0.511711 1 −18.1 −11.5 1865 TE-11 5.88 31.79 0.1119 −0.431 0.511821 1 −15.9 −9.8 1828 TE-12 5.48 28.35 0.1169 −0.406 0.511836 1 −15.6 −9.9 1900 Fig. 6 εNd vs. age diagram showing T DM values for the Late Ediacaran siliciclastic rocks of the Tentudía and Montemolín formations. The range of Nd model ages of selected regions are shown for comparison (Linnemann and Romer 2002; Fuenlabrada et al. 2016; Rojo- Pérez et al. 2019) &KDSWHU