Taocun
Anhui, Ningwu volcanic basin (Middle-Lower Yangtze Valley), China
IOCGFe (V, P)
- Type
- Iron oxide-apatite (Kiruna type) at the top of a diorite intrusion
One of over twenty IOA deposits of the Cretaceous Ningwu volcanic field: reserve of 360 Mt at 20-26 % Fe, 0.06-0.17 % V and 0.01-3.08 % P, twelve orebodies in altered diorite porphyry and at its contact with Dawangshan Formation andesites. Host diorite dated at 130.7 ± 1.8 Ma (zircon), ore at 131.1 ± 1.9 Ma (apatite). Three tourmaline-bearing stages: sodic alteration, Ca-Fe alteration with magnetite, Ca-Mg veins with sulphides. Su et al. (2019): δ11B from -8.5 to +5.4 ‰ and 87Sr/86Sr from 0.7065 to 0.7087, two magmatic fluid pulses followed by influx of external groundwater.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −4.87 ± 0.75 ‰ | −6.27 / −3.63 ‰ | 33 | tourmaline I of the sodic alteration, pre-ore (NW-56, albitite) Mean and standard deviation recalculated from 33 analyses, -6.27 to -3.63 (NW56-7-1 -5.19; NW56-7-2 -4.94; NW56-7-3 -4.74; NW56-7-4 -4.92; NW56-7-5 -5.36; NW56-6-1 -4.42; NW56-6-2 -4.19; NW56-6-3 -5.18; NW56-6-4 -5.07; NW56-6-5 -5.69; NW56-5-1 -5.35; NW56-5-2 -6.27; NW56-5-3 -6.07; NW56-5-4 -5.21; NW56-5-5 -5.83; NW56-5-6 -5.91; NW56-5-7 -5.51; NW56-2-1 -4.41; NW56-2-2 -4.01; NW56-2-3 -4.08; NW56-2-4 -5.20; NW56-2-5 -5.97; NW56-1-1 -3.63; NW56-1-2 -4.03; NW56-1-3 -5.78; NW56-8-1 -3.78; NW56-8-2 -4.26; NW56-8-3 -4.23; NW56-8-4 -4.23; NW56-8-5 -4.30; NW56-8-6 -4.23; NW56-8-7 -4.91; NW56-8-8 -3.97). Fluid calculated at 600 °C from -4.98 to -2.34 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −3.07 ± 0.77 ‰ | −4.79 / −1.86 ‰ | 21 | tourmaline I of the sodic alteration, pre-ore (NW-63-1, albitized diorite) Mean and standard deviation recalculated from 21 analyses, -4.79 to -1.86 (NW63-1-1-1 -2.17; NW63-1-1-2 -3.23; NW63-1-1-3 -3.39; NW63-1-1-4 -2.93; NW63-1-1-5 -2.84; NW63-1-1-6 -4.13; NW63-1-1-7 -4.79; NW63-1-2-1 -2.60; NW63-1-2-2 -2.00; NW63-1-2-3 -2.57; NW63-1-2-4 -3.11; NW63-1-2-5 -3.14; NW63-1-2-6 -2.47; NW63-1-3-1 -3.12; NW63-1-3-2 -3.35; NW63-1-3-3 -1.86; NW63-1-4-1 -4.01; NW63-1-4-2 -3.69; NW63-1-4-3 -4.09; NW63-1-5-1 -2.99; NW63-1-5-2 -2.04). Fluid calculated at 600 °C from -3.50 to -0.57 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −2.38 ± 0.69 ‰ | −4.43 / −1.37 ‰ | 25 | tourmaline I of the sodic alteration, pre-ore (NW-63, albitized diorite) Mean and standard deviation recalculated from 25 analyses, -4.43 to -1.37 (NW63-1-1 -2.53; NW63-1-2 -2.40; NW63-1-3 -4.43; NW63-1-4 -2.14; NW63-1-5 -1.37; NW63-2-1 -2.74; NW63-2-2 -1.73; NW63-2-3 -2.70; NW63-2-4 -2.04; NW63-2-5 -1.50; NW63-2-6 -1.69; NW63-2-7 -2.41; NW63-2-8 -2.70; NW63-3-1 -2.10; NW63-3-2 -2.96; NW63-3-3 -2.74; NW63-3-4 -1.76; NW63-3-5 -2.59; NW63-4-1 -2.38; NW63-4-2 -2.95; NW63-4-3 -1.95; NW63-4-4 -2.16; NW63-4-5 -3.71; NW63-4-6 -1.90; NW63-4-7 -1.82). Fluid calculated at 600 °C from -3.14 to -0.08 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −2.83 ± 1.34 ‰ | −5.32 / −1.19 ‰ | 13 | tourmaline I of the sodic alteration, pre-ore (14NW-111, albitite, light cores) Mean and standard deviation recalculated from 13 analyses, -5.32 to -1.19 (14NW111-1 -4.11; 14NW111-2 -1.22; 14NW111-3 -5.32; 14NW111-5 -2.99; 14NW111-7 -3.37; 14NW111-9 -4.16; 14NW111-10 -3.94; 14NW111-11 -3.39; 14NW111-12 -1.35; 14NW-111-2-1 -1.19; 14NW-111-2-2 -1.58; 14NW-111-2-5 -2.26; 14NW-111-2-6 -1.95). Fluid calculated at 600 °C from -4.03 to +0.10 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −2.45 ± 0.59 ‰ | −3.51 / −1.76 ‰ | 6 | tourmaline I of the sodic alteration, pre-ore (14NW-103, albitite, light cores) Mean and standard deviation recalculated from 6 analyses, -3.51 to -1.76 (14NW103-1 -1.76; 14NW103-2 -2.20; 14NW103-3 -2.58; 14NW103-4 -2.27; 14NW103-8 -3.51; 14NW103-9 -2.37). Fluid calculated at 600 °C from -2.22 to -0.47 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 2.68 ± 3.08 ‰ | −1.57 / 5.37 ‰ | 7 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-111, magnetite albitite, dark rims) Mean and standard deviation recalculated from 7 analyses, -1.57 to +5.37 (14NW111-4 +5.21; 14NW111-6 +5.15; 14NW111-8 +5.37; 14NW111-13 +4.60; 14NW-111-2-3 -0.73; 14NW-111-2-4 +0.72; 14NW-111-2-7 -1.57). Fluid calculated at 780 °C from -1.10 to +5.84 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 2.77 ± 2.17 ‰ | −0.37 / 4.65 ‰ | 6 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-111, magnetite-actinolite-apatite amygdule) Mean and standard deviation recalculated from 6 analyses, -0.37 to +4.65 (14NW-111-2-8 +4.34; 14NW-111-2-9 +3.30; 14NW-111-2-10 +4.65; 14NW-111-2-11 +4.20; 14NW-111-2-12 +0.47; 14NW-111-2-13 -0.37). Fluid calculated at 780 °C from +0.10 to +5.11 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.41 ± 1.59 ‰ | −0.72 / 3.56 ‰ | 7 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-103, magnetite albitite, dark rims) Mean and standard deviation recalculated from 7 analyses, -0.72 to +3.56 (14NW103-5 +1.46; 14NW103-6 -0.71; 14NW103-7 +0.21; 14NW103-10 +3.56; 14NW103-11 -0.57; 14NW103-12 -0.33; 14NW103-13 -0.72). Fluid calculated at 780 °C from -0.25 to +4.03 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.35 ± 0.57 ‰ | −0.72 / 1.24 ‰ | 12 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-101, disseminated scapolite-albite-magnetite-apatite-actinolite ore) Mean and standard deviation recalculated from 12 analyses, -0.72 to +1.24 (14NW101-1 0.00; 14NW101-2 +1.24; 14NW101-3 +0.71; 14NW101-4 -0.28; 14NW101-5 +0.58; 14NW101-6 +0.56; 14NW101-7 -0.72; 14NW101-8 +1.01; 14NW101-9 +0.57; 14NW101-10 -0.26; 14NW101-11 +0.28; 14NW101-12 +0.53). Fluid calculated at 780 °C from -0.26 to +1.71 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 1.65 ± 1.46 ‰ | −0.91 / 3.63 ‰ | 21 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (17NW-8, veined magnetite-apatite-actinolite ore) Mean and standard deviation recalculated from 21 analyses, -0.91 to +3.63 (17NW-8-1-1 +3.63; 17NW-8-1-2 +2.12; 17NW-8-1-3 +2.32; 17NW-8-1-4 +1.31; 17NW-8-1-5 +2.37; 17NW-8-1-6 +0.91; 17NW-8-2-1 +3.20; 17NW-8-2-2 +2.82; 17NW-8-2-3 +1.40; 17NW-8-2-4 +1.49; 17NW-8-2-5 -0.69; 17NW-8-2-6 -0.61; 17NW-8-2-7 -0.91; 17NW-8-2-8 -0.01; 17NW-8-2-9 +0.03; 17NW-8-2-10 +0.52; 17NW-8-2-11 +2.33; 17NW-8-2-12 +2.90; 17NW-8-2-13 +2.84; 17NW-8-2-14 +3.38; 17NW-8-2-15 +3.31). Fluid calculated at 780 °C from -0.44 to +4.10 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −1.08 ± 0.74 ‰ | −2.44 / 0.51 ‰ | 18 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (17NW-5, veined magnetite-actinolite ore) Mean and standard deviation recalculated from 18 analyses, -2.44 to +0.51 (17NW-5-5-1 -0.34; 17NW-5-5-2 +0.51; 17NW-5-5-3 +0.33; 17NW-5-5-4 -0.72; 17NW-5-5-5 -1.10; 17NW-5-5-6 -0.84; 17NW-5-5-7 -1.56; 17NW-5-5-8 -1.79; 17NW-5-5-9 -0.93; 17NW-5-5-10 -2.44; 17NW-5-2-1 -0.84; 17NW-5-2-2 -1.68; 17NW-5-2-3 -1.15; 17NW-5-2-4 -1.15; 17NW-5-2-5 -1.41; 17NW-5-2-6 -1.36; 17NW-5-2-7 -0.97; 17NW-5-2-8 -2.01). Fluid calculated at 780 °C from -1.98 to +0.98 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 4.03 ± 0.21 ‰ | 3.57 / 4.29 ‰ | 13 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (NW-87, veined or massive magnetite-actinolite-gypsum ore) Mean and standard deviation recalculated from 13 analyses, +3.57 to +4.29 (NW87-1 +3.77; NW87-3 +3.97; NW87-4 +4.29; NW87-5 +4.17; NW87-8 +4.21; NW87-11 +4.21; NW87-13 +4.08; NW87-2 +3.57; NW87-6 +4.22; NW87-7 +4.08; NW87-9 +3.79; NW87-10 +3.97; NW87-12 +4.10). Fluid calculated at 780 °C from +4.04 to +4.76 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −4.8 ± 3.3 ‰ | −8.47 / −0.11 ‰ | 6 | tourmaline IIIa of actinolite-sulphide veins, post-ore (14NW-11, actinolite-pyrite-chalcopyrite vein cutting albitite, dark cores) Mean and standard deviation recalculated from 6 analyses, -8.47 to -0.11 (14NW11-4 -0.11; 14NW11-12 -5.86; 14NW11-13 -1.32; 14NW11-8 -6.36; 14NW11-9 -8.47; 14NW11-10 -6.65). Fluid calculated at 410 °C from -5.84 to +2.52 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −0.12 ± 1.06 ‰ | −2.66 / 0.79 ‰ | 8 | tourmaline IIIa of actinolite-sulphide veins, post-ore (14NW-11, actinolite-pyrite-chalcopyrite vein cutting albitite, rims) Mean and standard deviation recalculated from 8 analyses, -2.66 to +0.79 (14NW11-1 -2.66; 14NW11-2 +0.46; 14NW11-3 +0.79; 14NW11-5 +0.02; 14NW11-6 -0.02; 14NW11-7 +0.24; 14NW11-11 +0.09; 14NW11-14 +0.15). Fluid calculated at 410 °C from -0.03 to +3.42 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −0.07 ± 0.28 ‰ | −0.5 / 0.26 ‰ | 7 | tourmaline IIIa of actinolite-sulphide veins, post-ore (14NW-50, actinolite-pyrite vein cutting massive ore) Mean and standard deviation recalculated from 7 analyses, -0.50 to +0.26 (14NW50-1 +0.07; 14NW50-2 -0.39; 14NW50-3 -0.50; 14NW50-4 -0.02; 14NW50-5 +0.13; 14NW50-6 +0.26; 14NW50-7 -0.02). Fluid calculated at 410 °C from +2.12 to +2.89 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −4.96 ± 0.94 ‰ | −5.58 / −2.69 ‰ | 8 | tourmaline IIIb of calcite-pyrite veins, post-ore (14NW-112, calcite-pyrite vein cutting massive ore, dark cores) Mean and standard deviation recalculated from 8 analyses, -5.58 to -2.69 (14NW112-1 -5.05; 14NW112-3 -4.98; 14NW112-5 -5.29; 14NW112-7 -5.35; 14NW112-10 -5.32; 14NW112-12 -5.39; 14NW112-14 -2.69; 14NW112-15 -5.58). Fluid calculated at 270 °C from -1.37 to +1.53 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| −5.16 ± 0.34 ‰ | −5.71 / −4.76 ‰ | 7 | tourmaline IIIb of calcite-pyrite veins, post-ore (14NW-112, calcite-pyrite vein cutting massive ore, light rims) Mean and standard deviation recalculated from 7 analyses, -5.71 to -4.76 (14NW112-2 -5.11; 14NW112-4 -5.09; 14NW112-6 -5.07; 14NW112-8 -4.76; 14NW112-9 -4.86; 14NW112-11 -5.50; 14NW112-13 -5.71). Fluid calculated at 270 °C from -1.50 to -0.55 ‰ (Appendix 3). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : Corail de l'océan Indien (Bizzarro et al., 2003)
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.70746 ± 0.00022 | 0.70721 / 0.70781 | 9 | tourmaline I of the sodic alteration, pre-ore (NW-56) Mean and standard deviation recalculated from 9 analyses, 0.70721 to 0.70781 (NW56-1 0.70774; NW56-2 0.70735; NW56-3 0.70734; NW56-4 0.70746; NW56-5 0.70721; NW56-6 0.70722; NW56-7 0.70762; NW56-8 0.70781; NW56-9 0.70736). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70725 ± 0.00013 | 0.70711 / 0.70737 | 5 | tourmaline I of the sodic alteration, pre-ore (NW-63-1) Mean and standard deviation recalculated from 5 analyses, 0.70711 to 0.70737 (NW63-1-1 0.70712; NW63-1-2 0.70737; NW63-1-3 0.70736; NW63-1-4 0.70727; NW63-1-5 0.70711). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70686 ± 0.0001 | 0.70679 / 0.70704 | 5 | tourmaline I of the sodic alteration, pre-ore (14NW-103) Mean and standard deviation recalculated from 5 analyses, 0.70679 to 0.70704 (14NW-103-2 0.70704; 14NW-103-3 0.70681; 14NW-103-4 0.70679; 14NW-103-6 0.70684; 14NW-103-8 0.70683). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70676 ± 0.0002 | 0.70655 / 0.70695 | 3 | tourmaline I of the sodic alteration, pre-ore (14NW-111) Mean and standard deviation recalculated from 3 analyses, 0.70655 to 0.70695 (14NW-111-2 0.70655; 14NW-111-3 0.70677; 14NW-111-4 0.70695). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70704 ± 0.0001 | 0.70694 / 0.70713 | 3 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-103) Mean and standard deviation recalculated from 3 analyses, 0.70694 to 0.70713 (14NW-103-1 0.70713; 14NW-103-5 0.70706; 14NW-103-7 0.70694). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70693 ± 0.00013 | 0.70679 / 0.7071 | 5 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-111) Mean and standard deviation recalculated from 5 analyses, 0.70679 to 0.70710 (14NW-111-1 0.70689; 14NW-111-5 0.70683; 14NW-111-6 0.70703; 14NW-111-7 0.70710; 14NW-111-8 0.70679). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70705 ± 0.00012 | 0.7069 / 0.70728 | 12 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (14NW-101) Mean and standard deviation recalculated from 12 analyses, 0.70690 to 0.70728 (14NW-101-1 0.70704; 14NW-101-2 0.70709; 14NW-101-3 0.70694; 14NW-101-4 0.70728; 14NW-101-5 0.70692; 14NW-101-6 0.70690; 14NW-101-7 0.70697; 14NW-101-8 0.70716; 14NW-101-9 0.70702; 14NW-101-10 0.70712; 14NW-101-11 0.70699; 14NW-101-12 0.70718). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70705 ± 0.00012 | 0.70684 / 0.70728 | 11 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (17NW-8) Mean and standard deviation recalculated from 11 analyses, 0.70684 to 0.70728 (17NW-8-3-1 0.70684; 17NW-8-3-2 0.70709; 17NW-8-3-3 0.70701; 17NW-8-2-1 0.70700; 17NW-8-2-2 0.70718; 17NW-8-2-3 0.70706; 17NW-8-2-4 0.70699; 17NW-8-1-1 0.70711; 17NW-8-1-2 0.70707; 17NW-8-1-3 0.70728; 17NW-8-1-4 0.70693). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70739 ± 0.00012 | 0.70724 / 0.7076 | 8 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (17NW-5) Mean and standard deviation recalculated from 8 analyses, 0.70724 to 0.70760 (17NW-5-2-1 0.70741; 17NW-5-2-2 0.70743; 17NW-5-2-3 0.70724; 17NW-5-2-4 0.70760; 17NW-5-5-1 0.70742; 17NW-5-5-2 0.70744; 17NW-5-5-3 0.70728; 17NW-5-5-4 0.70726). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70706 ± 0.00007 | 0.70693 / 0.70719 | 12 | tourmaline II of the Ca-Fe alteration with magnetite, syn-ore (NW-87) Mean and standard deviation recalculated from 12 analyses, 0.70693 to 0.70719 (NW-87-1 0.70698; NW-87-2 0.70693; NW-87-3 0.70702; NW-87-4 0.70705; NW-87-5 0.70719; NW-87-6 0.70709; NW-87-7 0.70703; NW-87-8 0.70700; NW-87-9 0.70705; NW-87-10 0.70714; NW-87-11 0.70709; NW-87-12 0.70713). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70762 ± 0.00008 | 0.70755 / 0.7078 | 7 | tourmaline IIIa of actinolite-sulphide veins, post-ore (14NW-11) Mean and standard deviation recalculated from 7 analyses, 0.70755 to 0.70780 (14NW11-1 0.70760; 14NW11-2 0.70780; 14NW11-3 0.70760; 14NW11-4 0.70760; 14NW11-5 0.70760; 14NW11-6 0.70755; 14NW11-7 0.70761). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70758 ± 0.00009 | 0.70745 / 0.7077 | 8 | tourmaline IIIa of actinolite-sulphide veins, post-ore (14NW-50) Mean and standard deviation recalculated from 8 analyses, 0.70745 to 0.70770 (14NW-50-1 0.70770; 14NW-50-2 0.70754; 14NW-50-3 0.70760; 14NW-50-4 0.70759; 14NW-50-5 0.70764; 14NW-50-6 0.70748; 14NW-50-7 0.70764; 14NW-50-8 0.70745). | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
| 0.70827 ± 0.00047 | 0.70767 / 0.70872 | 4 | tourmaline IIIb of calcite-pyrite veins, post-ore (14NW-112) Mean and standard deviation recalculated from 4 analyses, 0.70767 to 0.70872 (14NW-112-1 0.70813; 14NW-112-2 0.70767; 14NW-112-3 0.70872; 14NW-112-4 0.70855). Most radiogenic Sr: groundwater from nearby sedimentary rocks; the abstract gives 0.7076 to 0.7086 for stage III. | Su et al. (2019), Tourmaline boron and strontium isotope systematics reveal magmatic flui… |
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Cite this page
IsoFind Atlas (2026). Taocun, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/taocun/ (accessed 2026-10-20).
@misc{isofind2026taocunisotopesignatures,
title = {Taocun, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/taocun/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20