Mineralogical and Geochemical Compositions of the Lopingian Coals and Carbonaceous Rocks in the Shugentian Coalfield, Yunnan, China: with Emphasis on Fe-Bearing Minerals in a Continental-Marine Transitional Environment
Abstract
:1. Introduction
2. Geological Setting
3. Samples and Analytical Methods
4. Results
4.1. Proximate and Ultimate Analyses and Coal Rank
4.2. Geochemistry
4.2.1. Major-Element Oxides
4.2.2. Trace Elements
4.2.3. Rare Earth Elements and Yttrium
4.3. Mineralogy
4.3.1. Mineral Composition
4.3.2. Comparison between the Mineralogical and Chemical Compositions
4.3.3. Modes of Occurrence of Minerals in Coal and Carbonaceous Rock Benches
5. Discussion
5.1. Influencing Factors on Geological and Mineralogical Compositions
5.1.1. Sediment-Source Region
- The elevated concentrations of Sc, V, Cr, Co, Ni and Zn in the No. 1 Coal and carbonaceous rocks (Figure 3A,B), which were derived from basalts in the Kangdian Upland.
- The ratios of Al2O3/TiO2 of the coal and carbonaceous rock benches exclusively fall in the area between 3 to 8 (Figure 15), indicating that the terrigenous source of the studied samples is of mafic composition [83]. A number of studies showed that the ratio Al2O3/TiO2 is a reliable indicator for identifying the sediment-source regions not only for normal sediments but also for coal [32,80,83,84,85,86,87].
- It has been reported that quartz derived from the Kangdian Upland is abundant in the Lopingian coals in southwestern China [16]. The high authigenic quartz identified in the coal and carbonaceous rock benches (Figure 12A,B) was probably deposited from silica-bearing solutions originating from the weathering of basaltic rocks in the Kangdian Upland [48].
- All coal benches and non-coal samples (carbonaceous rock benches, parting, and roof and floor samples) have strong positive Eu anomalies (1.37 on average), except SGT1-11 (Figure 4). Eu anomalies require both high-temperature (>250 °C) and extreme reducing conditions [70,88,89]. For coals, Eu anomalies inherited from rocks within the sediment source region or affected by high-temperature hydrothermal fluids [70]. In Shugentian Coalfield, with no evidence indicating high temperature hydrothermals, the positive Eu anomalies are derived from tholeiitic basalts of the Kangdian Upland. Furthermore, The REY distribution patterns of coal, carbonaceous rock (except SGT1-11), parting, and roof and floor in the Shugentian Coalfield, characterized by M-type enrichment and positive Eu anomalies (Figure 15), are similar to those for low-Ti and high-Ti basalts from the western Emeishan Large Igneous Province as reported by Xiao et al. [71].
5.1.2. Volcanic Ash Input
5.1.3. Injection of Multi-Stage Hydrothermal Fluids
5.1.4. Sea Water
5.2. Major Fe-Bearing Minerals
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Sample | Type | Thickness | Mad | Aad | Vdaf | Cdaf | Hdaf | Ndaf | St,ad | Ss,ad | Sp,ad | So,ad |
---|---|---|---|---|---|---|---|---|---|---|---|---|
SGT1-R | Roof | 5cm | nd | 78.10 | nd | nd | nd | nd | 0.04 | nd | nd | nd |
SGT1-1 | C R | 15 cm | 0.54 | 60.99 | nd | nd | nd | nd | 0.83 | nd | nd | nd |
SGT1-2p | Parting | 20 cm | nd | 72.16 | nd | nd | nd | nd | 0.08 | nd | nd | nd |
SGT1-3 | C R | 15 cm | 0.62 | 69.43 | nd | nd | nd | nd | 1.59 | 0.04 | 1.55 | 0.02 |
SGT1-4 | C R | 15 cm | 0.78 | 68.41 | nd | nd | nd | nd | 1.24 | 0.02 | 1.42 | bdl |
SGT1-5 | C R | 15 cm | 0.77 | 66.21 | nd | nd | nd | nd | 2.01 | 0.03 | 2.13 | bdl |
SGT1-6 | C R | 15 cm | 0.70 | 71.99 | nd | nd | nd | nd | 2.52 | 0.02 | 2.36 | 0.15 |
SGT1-7 | C R | 15 cm | 0.56 | 58.15 | nd | nd | nd | nd | 2.60 | 0.01 | 2.38 | 0.23 |
SGT1-8 | Coal | 15 cm | 0.51 | 42.05 | 26.60 | 84.9 | 4.55 | 1.62 | 0.96 | nd | nd | nd |
SGT1-9 | Coal | 15 cm | 0.57 | 25.77 | 19.69 | 89.1 | 4.41 | 1.68 | 0.94 | nd | nd | nd |
SGT1-10 | C R | 15 cm | 0.65 | 57.78 | nd | nd | nd | nd | 1.82 | 0.05 | 1.80 | bdl |
SGT1-11 | C R | 15 cm | 0.74 | 66.71 | nd | nd | nd | nd | 12.03 | 0.08 | 5.25 | 6.79 |
SGT1-12 | C R | 15 cm | 0.78 | 54.87 | nd | nd | nd | nd | 5.64 | 0.04 | 3.96 | 1.68 |
SGT1-13 | C R | 15 cm | 0.53 | 66.19 | nd | nd | nd | nd | 1.02 | 0.04 | 0.92 | 0.07 |
SGT1-14 | C R | 15 cm | 0.63 | 66.61 | nd | nd | nd | nd | 0.58 | nd | nd | nd |
SGT1-15 | C R | 6 cm | 0.75 | 70.48 | nd | nd | nd | nd | 0.42 | nd | nd | nd |
SGT1-F1 | Floor | 13 cm | 1.02 | 78.80 | nd | nd | nd | nd | 0.40 | nd | nd | nd |
SGT1-F2 | Floor | 20 cm | nd | 82.90 | nd | nd | nd | nd | 0.11 | nd | nd | nd |
C R-wa | 0.67 | 64.52 | 2.81 |
Sample | Type | LOI/% | SiO2 | TiO2 | Al2O3 | Fe2O3 | MnO | MgO | CaO | Na2O | K2O | P2O5 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
SGT1-R | Roof | 21.90 | 26.73 | 2.46 | 12.96 | 20.87 | 0.33 | 1.39 | 8.25 | 0.30 | 0.49 | 0.29 |
SGT1-1 | C R | 39.01 | 30.12 | 3.67 | 17.50 | 6.70 | 0.13 | 0.38 | 0.85 | 0.14 | 0.42 | 0.23 |
SGT1-2p | Parting | 27.84 | 10.18 | 0.53 | 2.99 | 37.61 | 0.65 | 1.21 | 13.6 | 0.06 | 0.07 | 0.14 |
SGT1-3 | C R | 30.57 | 33.53 | 4.78 | 20.88 | 6.76 | 0.09 | 0.42 | 0.90 | 0.19 | 0.63 | 0.26 |
SGT1-4 | C R | 31.59 | 32.87 | 3.87 | 17.88 | 9.62 | 0.14 | 0.67 | 0.98 | 0.20 | 0.57 | 0.27 |
SGT1-5 | C R | 33.79 | 32.36 | 4.12 | 18.58 | 7.35 | 0.09 | 0.42 | 1.17 | 0.18 | 0.59 | 0.26 |
SGT1-6 | C R | 28.01 | 35.29 | 4.57 | 20.22 | 8.62 | 0.11 | 0.49 | 0.81 | 0.19 | 0.62 | 0.31 |
SGT1-7 | C R | 41.85 | 27.97 | 3.19 | 15.36 | 8.01 | 0.11 | 0.45 | 1.15 | 0.17 | 0.45 | 0.22 |
SGT1-8 | Coal | 57.95 | 20.04 | 2.26 | 11.95 | 5.05 | 0.08 | 0.33 | 0.95 | 0.11 | 0.28 | 0.15 |
SGT1-9 | Coal | 74.23 | 12.93 | 1.23 | 7.86 | 2.60 | 0.03 | 0.17 | 0.35 | 0.07 | 0.15 | 0.11 |
SGT1-10 | C R | 42.22 | 26.92 | 3.07 | 14.88 | 7.05 | 0.10 | 0.40 | 2.28 | 0.18 | 0.50 | 0.21 |
SGT1-11 | C R | 33.29 | 27.40 | 2.51 | 14.69 | 16.69 | 0.12 | 0.44 | 1.81 | 0.18 | 0.40 | 0.17 |
SGT1-12 | C R | 45.13 | 25.46 | 2.86 | 14.67 | 8.78 | 0.05 | 0.31 | 0.97 | 0.16 | 0.42 | 0.16 |
SGT1-13 | C R | 33.81 | 29.00 | 3.36 | 16.31 | 9.74 | 0.19 | 0.54 | 3.22 | 0.17 | 0.40 | 0.23 |
SGT1-14 | C R | 33.39 | 30.19 | 4.06 | 19.17 | 9.29 | 0.18 | 0.51 | 1.16 | 0.16 | 0.39 | 0.23 |
SGT1-15 | C R | 29.52 | 29.07 | 3.86 | 18.81 | 13.40 | 0.26 | 0.73 | 1.68 | 0.14 | 0.36 | 0.29 |
SGT1-F1 | Floor | 21.20 | 30.92 | 2.79 | 14.32 | 16.67 | 0.25 | 1.59 | 7.07 | 0.36 | 0.77 | 0.27 |
SGT1-F2 | Floor | 17.10 | 25.62 | 2.01 | 9.81 | 18.35 | 0.48 | 2.41 | 19.3 | 0.24 | 0.31 | 0.48 |
C-Wa | 30.07 | 3.65 | 17.34 | 9.12 | 0.12 | 0.47 | 1.40 | 0.17 | 0.48 | 0.23 | ||
Chinese | 8.47 | 0.33 | 5.98 | 4.85 | 0.015 | 0.22 | 1.23 | 0.16 | 0.19 | 0.09 |
Sample | Li | Be | B | F | Sc | V | Cr | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Rb | Sr | Zr | Nb |
SGT1-R | 34 | 2.17 | 27 | 231 | 32 | 241 | 60 | 32 | 47 | 123 | 108 | 18 | 1.6 | 2.0 | 1.7 | 14 | 525 | 317 | 40 |
SGT1-1 | 74 | 2.45 | 35 | 283 | 22 | 258 | 69 | 33 | 41 | 145 | 139 | 27 | 2.1 | 3.5 | 3.9 | 16 | 274 | 496 | 56 |
SGT1-2p | 12 | 1.42 | 13 | 118 | 7.1 | 60 | 15 | 7.1 | 11 | 25 | 88 | 4.0 | 0.94 | 1.3 | 0.65 | 3.0 | 501 | 94 | 9.3 |
SGT1-3 | 88 | 3.16 | 38 | 318 | 29 | 386 | 92 | 52 | 67 | 195 | 176 | 35 | 2.5 | 7.9 | 3.9 | 24 | 328 | 661 | 75 |
SGT1-4 | 74 | 2.88 | 45 | 341 | 26 | 299 | 76 | 41 | 55 | 182 | 163 | 29 | 2.2 | 5.2 | 3.9 | 22 | 284 | 545 | 62 |
SGT1-5 | 78 | 2.82 | 38 | 299 | 26 | 322 | 86 | 46 | 62 | 173 | 165 | 32 | 2.2 | 6.7 | 5.4 | 23 | 348 | 560 | 65 |
SGT1-6 | 90 | 3.26 | 50 | 283 | 28 | 396 | 89 | 47 | 63 | 199 | 184 | 34 | 2.4 | 9.1 | 4.1 | 24 | 317 | 644 | 73 |
SGT1-7 | 66 | 2.46 | 27 | 284 | 21 | 248 | 65 | 32 | 49 | 148 | 133 | 25 | 2.0 | 5.7 | 4.9 | 16 | 284 | 460 | 51 |
SGT1-8 | 51 | 1.75 | 26 | 170 | 14 | 172 | 45 | 23 | 31 | 96 | 93 | 19 | 1.7 | 1.8 | 3.1 | 10 | 238 | 324 | 37 |
SGT1-9 | 35 | 1.13 | 20 | 119 | 7.9 | 119 | 28 | 13 | 18 | 60 | 48 | 13 | 1.3 | 0.87 | 2.3 | 5.2 | 125 | 184 | 22 |
SGT1-10 | 56 | 2.2 | 32 | 281 | 19 | 228 | 61 | 35 | 47 | 129 | 113 | 24 | 1.9 | 6.2 | 5.8 | 19 | 351 | 430 | 48 |
SGT1-11 | 13 | 4.13 | 25 | 205 | 4.8 | 2.5 | 5.2 | 1.8 | 63 | 12 | 92 | 22 | 1.5 | 71 | 14 | 263 | 40 | 437 | 32 |
SGT1-12 | 56 | 1.99 | 24 | 214 | 19 | 227 | 64 | 31 | 47 | 133 | 109 | 23 | 1.8 | 27 | 8.1 | 16 | 248 | 424 | 47 |
SGT1-13 | 67 | 2.34 | 26 | 267 | 22 | 248 | 68 | 32 | 44 | 139 | 139 | 24 | 2.1 | 3.9 | 3.3 | 15 | 416 | 463 | 52 |
SGT1-14 | 86 | 2.63 | 32 | 291 | 26 | 314 | 79 | 36 | 44 | 166 | 150 | 30 | 2.2 | 2.7 | 3.3 | 14 | 319 | 587 | 65 |
SGT1-15 | 85 | 2.69 | 36 | 359 | 25 | 310 | 80 | 34 | 41 | 166 | 161 | 29 | 2.1 | 2.9 | 2.9 | 17 | 373 | 574 | 65 |
SGT1-F1 | 34 | 2.53 | 27 | 350 | 20 | 247 | 101 | 39 | 58 | 136 | 120 | 23 | 1.9 | 4.9 | 2.6 | 28 | 691 | 390 | 45 |
SGT1-F2 | 28 | 1.78 | 15 | 564 | 29 | 188 | 146 | 37 | 74 | 76 | 107 | 22 | 1.7 | 2.0 | 0.75 | 16 | 748 | 275 | 12 |
C-wa | 43 | 1.44 | 23 | 144 | 11 | 146 | 36 | 18 | 25 | 78 | 70 | 16 | 1.5 | 1.3 | 2.7 | 7.7 | 181 | 254 | 29 |
CR-wa | 59 | 2.58 | 31 | 302 | 23 | 253 | 76 | 35 | 53 | 136 | 134 | 17 | 2.0 | 10 | 4.5 | 34 | 381 | 465 | 50 |
Coal | 14 | 2 | 47 | 82 | 3.7 | 28 | 17 | 6 | 17 | 16 | 28 | 6 | 2.4 | 9 | 1.6 | 18 | 100 | 36 | 4 |
Clay | 54 | 3 | 110 | 610 | 15 | 120 | 110 | 19 | 49 | 36 | 89 | 16 | 2 | 9.3 | 0.36 | 133 | 240 | 190 | 11 |
CC1 | 3.1 | 0.7 | 0.5 | 1.8 | 2.9 | 5.2 | 2.1 | 3.0 | 1.4 | 4.9 | 2.5 | 2.6 | 0.6 | 0.1 | 1.7 | 0.4 | 1.8 | 7 | 7.4 |
CC2 | 1.09 | 0.86 | 0.28 | 0.50 | 1.54 | 2.11 | 0.69 | 1.83 | 1.09 | 3.78 | 1.51 | 1.08 | 0.98 | 1.12 | 12.35 | 0.26 | 1.59 | 2.45 | 4.55 |
CC3 | 4.9 | 1.38 | 0.72 | 3.43 | 5.96 | 9.56 | 4.05 | 5.87 | 3.08 | 9.25 | 5.10 | 4.62 | 0.87 | 1.45 | 3.41 | 2.23 | 2.94 | 14.47 | 14.31 |
Sample | Mo | Cd | In | Sn | Sb | Cs | Ba | La | Yb | Hf | Ta | W | Hg | Tl | Pb | Bi | Th | U | |
SGT1-R | 1.6 | 0.46 | 0.08 | 2.2 | bdl | 0.93 | 232 | 46 | 3.5 | 6.8 | 3.4 | 4.5 | 18 | 0.00 | 10 | bdl | 10 | 1.8 | |
SGT1-1 | 1.7 | 0.65 | 0.12 | 3.2 | bdl | 1.3 | 211 | 59 | 3.8 | 9.2 | 3.6 | 2.3 | 98 | 0.02 | 9.3 | 0.08 | 10 | 4.2 | |
SGT1-2p | 0.29 | 0.18 | 0.02 | 0.52 | bdl | 0.31 | 136 | 11 | 1.4 | 2.1 | 1.9 | 2.4 | 15 | bdl | 3.2 | bdl | 1.2 | 0.61 | |
SGT1-3 | 3.1 | 0.89 | 0.15 | 4.3 | bdl | 1.8 | 374 | 81 | 4.7 | 13 | 4.7 | 2.8 | 175 | 0.06 | 12 | 0.06 | 12 | 4.9 | |
SGT1-4 | 2.0 | 0.66 | 0.13 | 3.4 | bdl | 1.6 | 259 | 65 | 4.0 | 9.6 | 3.3 | 1.9 | 114 | 0.02 | 9.4 | 0.08 | 10 | 4.1 | |
SGT1-5 | 2.7 | 0.75 | 0.14 | 3.8 | bdl | 1.7 | 267 | 68 | 3.9 | 11 | 3.6 | 3.0 | 178 | 0.05 | 16 | 0.05 | 10 | 4.1 | |
SGT1-6 | 2.8 | 0.80 | 0.15 | 4.1 | bdl | 1.8 | 259 | 75 | 4.1 | 13 | 4.5 | 2.4 | 231 | 0.12 | 13 | 0.05 | 11 | 4.5 | |
SGT1-7 | 2.5 | 0.59 | 0.11 | 2.9 | bdl | 1.3 | 246 | 55 | 3.3 | 8.3 | 2.7 | 3.5 | 216 | 0.13 | 15 | 0.08 | 8.5 | 3.3 | |
SGT1-8 | 1.6 | 0.43 | 0.09 | 2.5 | bdl | 0.80 | 338 | 41 | 2.4 | 8.2 | 4.3 | 1.5 | 106 | 0.03 | 12 | 0.14 | 6.5 | 2.5 | |
SGT1-9 | 0.60 | 0.30 | 0.06 | 2.0 | bdl | 0.47 | 201 | 28 | 1.6 | 4.9 | 1.8 | 0.34 | 94 | 0.01 | 10 | 0.13 | 6.6 | 2.1 | |
SGT1-10 | 1.9 | 0.60 | 0.11 | 2.8 | bdl | 1.4 | 355 | 52 | 3.0 | 7.8 | 2.4 | 2.2 | 167 | 0.08 | 17 | 0.08 | 7.7 | 3.0 | |
SGT1-11 | 2.1 | 0.56 | 0.07 | 3.0 | bdl | 3.3 | 508 | 84 | 4.2 | 9.7 | 0.9 | 0.02 | 1987 | 0.92 | 36 | bdl | 21 | 4.0 | |
SGT1-12 | 4.4 | 0.64 | 0.10 | 2.7 | bdl | 1.3 | 247 | 50 | 2.9 | 7.3 | 2.4 | 3.0 | 801 | 0.48 | 22 | 0.07 | 6.6 | 2.7 | |
SGT1-13 | 1.7 | 0.61 | 0.11 | 2.9 | bdl | 1.2 | 208 | 57 | 3.3 | 8.2 | 2.9 | 4.4 | 118 | 0.08 | 11 | 0.04 | 7.1 | 2.7 | |
SGT1-14 | 1.7 | 0.73 | 0.13 | 3.6 | bdl | 1.2 | 199 | 70 | 3.8 | 11 | 3.7 | 1.7 | 81 | 0.01 | 8.6 | 0.04 | 8.7 | 3.4 | |
SGT1-15 | 1.5 | 0.76 | 0.13 | 3.4 | bdl | 1.3 | 208 | 69 | 3.8 | 9.8 | 3.3 | 2.6 | 74 | 0.03 | 10 | 0.03 | 8.7 | 3.3 | |
SGT1-F1 | 1.3 | 0.58 | 0.10 | 2.4 | bdl | 1.4 | 248 | 49 | 2.8 | 6.6 | 2.3 | 2.9 | 56 | 0.06 | 18 | bdl | 5.0 | 1.4 | |
SGT1-F2 | 0.39 | 0.44 | 0.06 | bdl | bdl | 0.63 | 122 | 60 | 3.0 | 5.2 | bdl | 0.54 | 17 | bdl | 6.9 | bdl | 7.1 | 0.83 | |
C-wa | 1.1 | 0.36 | 0.07 | 2.2 | bdl | 0.64 | 270 | 34 | 2.0 | 6.5 | 3.1 | 0.94 | 100 | 0.02 | 11 | 0.13 | 6.6 | 2.3 | |
C R-wa | 2.0 | 0.62 | 0.11 | 2.8 | bdl | 1.4 | 259 | 65 | 3.7 | 8.8 | 2.8 | 2.5 | 281 | 0.13 | 14 | 0.03 | 9.4 | 3.1 | |
Coal | 2.1 | 0.2 | 0.04 | 1.4 | 1 | 1.1 | 150 | 11 | 1 | 1.2 | 0.3 | 0.99 | 100 | 0.58 | 9 | 1.1 | 3.2 | 1.9 | |
Clay | 1.6 | 0.91 | 0.06 | 3.5 | 1.3 | 13 | 460 | 48 | 2.5 | 5 | 1.4 | 2.6 | 68 | 1.3 | 14 | 0.38 | 14 | 4.3 | |
CC1 | 0.5 | 1.8 | 1.9 | 1.6 | bdl | 0.6 | 1.8 | 3.1 | 2.0 | 5.4 | 10.2 | 0.9 | 1.0 | 0.0 | 1.2 | 0.1 | 2.1 | 1.2 | |
CC2 | 1.27 | 0.69 | 1.73 | 0.81 | bdl | 0.11 | 0.56 | 1.36 | 1.49 | 1.75 | 2.01 | 0.97 | 4.14 | 0.10 | 0.99 | 0.08 | 0.67 | 0.72 | |
CC3 | 1.14 | 3.41 | 3.05 | 2.38 | bdl | 1.46 | 1.88 | 5.94 | 3.73 | 8.15 | 10.48 | 2.50 | 3.68 | 0.30 | 1.68 | 0.05 | 3.18 | 1.95 |
Sample | Type | LTA | Qua | Kao | Mix | Ana | Sid | Pyr | Cal | Ank | Alb | Cha |
---|---|---|---|---|---|---|---|---|---|---|---|---|
SGT1-R | Roof | 78.10 * | 16.5 | 11.1 | 13.3 | 2.3 | 37.3 | 15.9 | 2.5 | 1.1 | ||
SGT1-1 | C R | 60.99 * | 16.8 | 28.9 | 28.3 | 6.1 | 14.9 | 4.2 | 0.8 | |||
SGT1-2p | Parting | 72.16 * | 7.8 | 7.2 | 64.9 | 20.1 | ||||||
SGT1-3 | C R | 69.43 * | 9.9 | 35.8 | 35 | 5.2 | 9 | 4.2 | 0.9 | |||
SGT1-4 | C R | 68.41 * | 16.9 | 25.6 | 25.9 | 6.6 | 19.7 | 5.3 | ||||
SGT1-5 | C R | 66.21 * | 15.1 | 26.7 | 31.6 | 7.2 | 10.4 | 7.4 | 1.6 | |||
SGT1-6 | C R | 71.99 * | 15.9 | 33.4 | 30.1 | 5.6 | 6.4 | 8.5 | ||||
SGT1-7 | C R | 58.15 * | 18.8 | 25 | 26 | 4.9 | 13.9 | 9.7 | 1.5 | |||
SGT1-8 | Coal | 48.95 | 7.8 | 17.5 | 12 | 2.5 | 4.5 | 2.4 | 1.5 | 0.8 | ||
SGT1-9 | Coal | 33.80 | 8.8 | 16 | 12.5 | 1.5 | 3.3 | 1.8 | 0.2 | 0.3 | ||
SGT1-10 | C R | 57.78 * | 16.8 | 23.2 | 27.7 | 5.9 | 12.8 | 8.7 | 4.8 | |||
SGT1-11 | C R | 66.71 * | 14.4 | 20.2 | 21.7 | 4.8 | 8.8 | 26.1 | 3.5 | 0.4 | ||
SGT1-12 | C R | 54.87 * | 15.1 | 28.4 | 29.5 | 3 | 3.5 | 17.6 | 2.8 | |||
SGT1-13 | C R | 66.19 * | 19.8 | 19.9 | 19.3 | 5.3 | 23.1 | 3.4 | 9.3 | |||
SGT1-14 | C R | 66.61 * | 12.2 | 28.9 | 24.6 | 7.3 | 23 | 2 | 2 | |||
SGT1-15 | C R | 70.48 * | 10.6 | 29 | 17.1 | 5.9 | 34 | 2.3 | 1.1 | |||
SGT1-F1 | Floor | 78.80 * | 24 | 25.4 | 5.1 | 22.9 | 1.5 | 10.5 | 1.7 | 1.3 | 7.7 | |
SGT1-F2 | Floor | 82.90 * | 21.7 | 10.9 | 2.6 | 6.9 | 30.2 | 5.4 | 2.9 | 19.3 |
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Zheng, X.; Wang, Z.; Wang, L.; Xu, Y.; Liu, J. Mineralogical and Geochemical Compositions of the Lopingian Coals and Carbonaceous Rocks in the Shugentian Coalfield, Yunnan, China: with Emphasis on Fe-Bearing Minerals in a Continental-Marine Transitional Environment. Minerals 2017, 7, 170. https://doi.org/10.3390/min7090170
Zheng X, Wang Z, Wang L, Xu Y, Liu J. Mineralogical and Geochemical Compositions of the Lopingian Coals and Carbonaceous Rocks in the Shugentian Coalfield, Yunnan, China: with Emphasis on Fe-Bearing Minerals in a Continental-Marine Transitional Environment. Minerals. 2017; 7(9):170. https://doi.org/10.3390/min7090170
Chicago/Turabian StyleZheng, Xue, Zhen Wang, Lei Wang, Yaguang Xu, and Jingjing Liu. 2017. "Mineralogical and Geochemical Compositions of the Lopingian Coals and Carbonaceous Rocks in the Shugentian Coalfield, Yunnan, China: with Emphasis on Fe-Bearing Minerals in a Continental-Marine Transitional Environment" Minerals 7, no. 9: 170. https://doi.org/10.3390/min7090170