Mesozoic High- and Low-SiO2 Adakites and A-Type Granites in the Lower Yangtze River Belt, Eastern China: Implications for Petrogenesis and Metallogeny
Abstract
:1. Introduction
2. Geological Setting and Samples
3. Analytical Methods
3.1. Whole-Rock Major and Trace Element Analysis
3.2. LA-ICPMS Zircon U-Pb Dating
3.3. Zircon Lu-Hf Isotope Analysis
3.4. Zircon Trace Element Analysis
4. Results
4.1. Major and Trace Elements
4.2. Zircon Morphology, U-Pb Dating and Trace Element
4.3. Zircon Lu-Hf Isotopes
5. Discussion
5.1. Age and Petrogenesis of Diorites
5.2. Age and Petrogenesis of A-Type Granites
5.3. Tectonic Evolution and Mineralization
6. Conclusions
- (1)
- Adakites from the Anqing orefield can be divided into two groups as LSA and HSA, corresponding with the Yueshan and Zongpu diorites, respectively. Subduction-related setting is proposed for the magma genesis and involved the following processes. In the early stage, the HSA formed by slab-melts that reacted with peridotite during ascend through the overlying enriched mantle wedge. Subsequently, melting of a peridotitic overlying enriched mantle wedge whose composition has been modified by reaction with slab-melts occurred. Zircons in the HSA and LSA yield ages of 138 Ma and 136 Ma, respectively. Porphyry copper-gold deposits are closely associated with and genetically related to these adakites.
- (2)
- The A1-type granites are dated at 124 Ma, and their zircon εHf(t) values and geochemical features suggest formation through partial melting of Neoproterozoic crust with minor juvenile input under a back-arc extensional setting associated with the roll-back of Paleo–Pacific plate. The source for U in the associated ore deposit is considered to be the A-type granites and sandstones. The emplacement of A-type granitic intrusion provided the heat and fluids which mobilized and concentrated the U.
- (3)
- The adakites together with A-type granites record a tectonic transition from a compressive to an extensional setting during 138–124 Ma.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Samples | YS18 | 14YS01 | 14YS02 | 14YS03 | 14YS04 | 14YS05 | 14YS06 | 03ZPS02 | 14ZP01 | 14ZP02 | 14ZP03 | 14ZP04 | 14ZP05 | 14DLS01 | 14DLS02 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Intrusion | Yueshan | Yueshan | Yueshan | Yueshan | Yueshan | Yueshan | Yueshan | Zongpu | Zongpu | Zongpu | Zongpu | Zongpu | Zongpu | Dalongshan | Dalongshan |
Major oxides (wt %) | |||||||||||||||
SiO2 | 62.26 | 57.06 | 58.43 | 58.91 | 58.49 | 56.68 | 56.66 | 64.23 | 63.71 | 63.54 | 63.50 | 63.41 | 63.86 | 64.04 | 63.16 |
Al2O3 | 16.30 | 16.59 | 16.50 | 16.48 | 16.45 | 16.56 | 16.58 | 17.06 | 17.00 | 16.88 | 16.80 | 16.83 | 16.92 | 16.47 | 16.36 |
Fe2O3 | 5.24 | 6.39 | 5.61 | 5.90 | 5.57 | 6.39 | 6.39 | 2.50 | 3.56 | 3.88 | 3.64 | 3.63 | 3.67 | 3.80 | 3.60 |
CaO | 4.24 | 5.83 | 5.58 | 5.42 | 5.57 | 5.74 | 5.89 | 2.46 | 4.15 | 4.12 | 3.87 | 3.93 | 3.70 | 1.68 | 2.08 |
MgO | 2.40 | 3.37 | 3.01 | 3.00 | 3.10 | 3.30 | 3.30 | 2.11 | 1.84 | 1.80 | 1.85 | 1.84 | 1.88 | 0.91 | 0.83 |
Na2O | 3.90 | 5.00 | 4.92 | 4.78 | 4.96 | 4.99 | 5.01 | 6.22 | 5.24 | 5.24 | 5.27 | 5.26 | 5.41 | 5.86 | 5.78 |
K2O | 3.20 | 2.89 | 2.97 | 3.08 | 2.99 | 2.88 | 2.83 | 2.41 | 2.19 | 2.17 | 2.27 | 2.20 | 2.25 | 5.30 | 5.20 |
TiO2 | 0.80 | 0.78 | 0.69 | 0.76 | 0.67 | 0.77 | 0.78 | 0.56 | 0.45 | 0.45 | 0.46 | 0.46 | 0.46 | 0.73 | 0.78 |
MnO | 0.09 | 0.10 | 0.09 | 0.10 | 0.10 | 0.10 | 0.10 | 0.02 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.09 | 0.08 |
P2O5 | 0.281 | 0.490 | 0.411 | 0.452 | 0.420 | 0.487 | 0.491 | 0.250 | 0.226 | 0.219 | 0.223 | 0.226 | 0.222 | 0.239 | 0.252 |
LOI | 0.75 | 1.14 | 0.82 | 0.70 | 0.86 | 1.11 | 0.92 | 1.07 | 1.06 | 1.04 | 1.19 | 1.14 | 1.28 | 0.64 | 1.10 |
Total | 99.46 | 99.99 | 99.38 | 99.90 | 99.51 | 99.36 | 99.31 | 98.89 | 99.77 | 99.69 | 99.41 | 99.26 | 99.99 | 99.87 | 99.34 |
K2O/Na2O | 0.82 | 0.58 | 0.60 | 0.64 | 0.60 | 0.58 | 0.56 | 0.39 | 0.42 | 0.41 | 0.43 | 0.42 | 0.42 | 0.90 | 0.90 |
Mg# | 47.57 | 51.09 | 51.52 | 50.18 | 52.44 | 50.57 | 50.57 | 62.57 | 50.59 | 47.89 | 50.17 | 50.10 | 50.37 | 32.18 | 31.35 |
Trace elements (ppm) | |||||||||||||||
Ba | 1670 | 1270 | 1240 | 1150 | 1310 | 1310 | 1240 | 242 | 1430 | 1430 | 1430 | 1450 | 1310 | 720 | 730 |
Cr | 30 | 31 | 34 | 28 | 31 | 29 | 32 | 40 | 25 | 63 | 48 | 50 | 47 | 41 | 29 |
Hf | 6 | 0.9 | 1.0 | 1.0 | 1.1 | 1.0 | 1.0 | 3.8 | 0.8 | 0.8 | 0.8 | 0.9 | 0.8 | 2.1 | 2.2 |
Nb | 9.3 | 7.4 | 7.1 | 9.0 | 7.4 | 7.6 | 7.8 | 7.2 | 6.3 | 6.4 | 6.3 | 6.5 | 6.4 | 34.6 | 38.1 |
Ni | 13 | 16.7 | 16.7 | 12.5 | 16.6 | 16.2 | 16.3 | 16 | 14.6 | 15.9 | 14.7 | 14.9 | 14.4 | 3.1 | 1.9 |
Pb | 18 | 16.0 | 17.9 | 16.6 | 14.0 | 16.2 | 15.3 | 11 | 11.3 | 11.8 | 13.7 | 10.3 | 13.6 | 19.6 | 17.3 |
Rb | 77.5 | 41.1 | 40.1 | 53.4 | 48.0 | 42.6 | 41.0 | 10.6 | 27.6 | 28.1 | 31.0 | 30.4 | 30.5 | 175.0 | 179.5 |
Sr | 773 | 1800 | 1690 | 1600 | 1880 | 1880 | 1840 | 632 | 1570 | 1570 | 1470 | 1550 | 1420 | 296 | 306 |
Ta | 0.5 | 0.32 | 0.34 | 0.47 | 0.33 | 0.35 | 0.36 | 0.3 | 0.34 | 0.37 | 0.36 | 0.36 | 0.35 | 2.06 | 2.34 |
Th | 8.48 | 12.2 | 7.8 | 13.3 | 9.4 | 8.3 | 9.3 | 5.35 | 4.4 | 4.4 | 4.6 | 4.8 | 4.5 | 20.8 | 20.2 |
Ti | 4796 | 4420 | 3940 | 4170 | 4070 | 4590 | 4450 | 3357 | 2590 | 2680 | 2660 | 2770 | 2570 | 4250 | 4670 |
U | 1.63 | 2.3 | 2.4 | 2.7 | 2.8 | 2.1 | 2.4 | 1.63 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 3.1 | 3.0 |
Y | 16.9 | 12.0 | 8.9 | 13.0 | 10.8 | 12.3 | 13.0 | 10.1 | 8.7 | 8.7 | 8.9 | 9.2 | 9.1 | 34.8 | 38.5 |
Zr | 245 | 16.2 | 20.0 | 15.6 | 22.9 | 17.0 | 17.9 | 153 | 14.7 | 15.4 | 15.0 | 15.7 | 15.4 | 50.2 | 49.4 |
La | 54 | 44.3 | 36.7 | 48.4 | 42.1 | 47.5 | 51.7 | 28.9 | 25.5 | 25.9 | 26.1 | 27.0 | 26.0 | 89.1 | 95.8 |
Ce | 96.4 | 94.1 | 78.5 | 100.5 | 92.8 | 101.0 | 107.0 | 54.4 | 53.4 | 53.7 | 55.5 | 56.3 | 55.0 | 167.5 | 188.0 |
Pr | 10.85 | 10.30 | 8.43 | 10.75 | 10.15 | 11.00 | 11.70 | 6.47 | 5.96 | 5.93 | 6.19 | 6.37 | 6.24 | 16.95 | 19.50 |
Nd | 38 | 40.3 | 31.5 | 39.7 | 39.0 | 42.3 | 45.9 | 24.3 | 22.7 | 22.7 | 23.4 | 24.5 | 23.5 | 58.3 | 66.0 |
Sm | 6.14 | 6.59 | 5.23 | 6.67 | 6.42 | 7.07 | 7.54 | 4.27 | 3.90 | 3.91 | 3.94 | 4.10 | 3.94 | 9.40 | 11.10 |
Eu | 1.81 | 1.76 | 1.40 | 1.71 | 1.70 | 1.93 | 2.00 | 1.26 | 1.12 | 1.08 | 1.07 | 1.15 | 1.08 | 2.02 | 2.18 |
Gd | 6.25 | 4.14 | 3.30 | 4.21 | 3.95 | 4.50 | 4.65 | 4.03 | 2.67 | 2.64 | 2.63 | 2.80 | 2.61 | 6.73 | 7.77 |
Tb | 0.77 | 0.50 | 0.40 | 0.54 | 0.49 | 0.56 | 0.58 | 0.49 | 0.35 | 0.35 | 0.35 | 0.37 | 0.35 | 1.06 | 1.20 |
Dy | 3.64 | 2.51 | 1.96 | 2.68 | 2.39 | 2.76 | 2.83 | 2.21 | 1.84 | 1.82 | 1.83 | 1.90 | 1.87 | 6.20 | 7.07 |
Ho | 0.69 | 0.45 | 0.35 | 0.49 | 0.41 | 0.49 | 0.50 | 0.4 | 0.34 | 0.33 | 0.34 | 0.35 | 0.35 | 1.24 | 1.43 |
Er | 1.97 | 1.17 | 0.89 | 1.31 | 1.11 | 1.30 | 1.30 | 1.15 | 0.93 | 0.91 | 0.91 | 0.95 | 0.94 | 3.68 | 4.29 |
Tm | 0.27 | 0.16 | 0.12 | 0.18 | 0.15 | 0.17 | 0.17 | 0.15 | 0.13 | 0.13 | 0.13 | 0.13 | 0.13 | 0.56 | 0.64 |
Yb | 1.71 | 1.00 | 0.82 | 1.20 | 0.97 | 1.09 | 1.11 | 0.97 | 0.83 | 0.86 | 0.84 | 0.88 | 0.86 | 3.79 | 4.28 |
Lu | 0.26 | 0.18 | 0.15 | 0.20 | 0.17 | 0.19 | 0.19 | 0.14 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.61 | 0.69 |
∑REE | 239.66 | 219.46 | 178.65 | 231.54 | 212.61 | 234.16 | 250.17 | 139.24 | 128.52 | 129.11 | 132.28 | 136.15 | 132.12 | 401.94 | 448.45 |
δEu | 0.90 | 1.03 | 1.03 | 0.99 | 1.03 | 1.05 | 1.04 | 0.93 | 1.06 | 1.03 | 1.02 | 1.04 | 1.03 | 0.78 | 0.72 |
(La/Yb)N | 21.45 | 30.09 | 30.40 | 27.40 | 29.48 | 29.60 | 31.64 | 20.24 | 20.87 | 20.46 | 21.11 | 20.84 | 20.54 | 15.97 | 15.21 |
TZr (°C) | 794 | 569 | 585 | 574 | 592 | 572 | 574 | 761 | 592 | 595 | 594 | 597 | 597 | 664 | 658 |
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Liu, L.; Chu, G.; Li, Y.; Yang, X.; Santosh, M.; Hu, Q. Mesozoic High- and Low-SiO2 Adakites and A-Type Granites in the Lower Yangtze River Belt, Eastern China: Implications for Petrogenesis and Metallogeny. Minerals 2018, 8, 328. https://doi.org/10.3390/min8080328
Liu L, Chu G, Li Y, Yang X, Santosh M, Hu Q. Mesozoic High- and Low-SiO2 Adakites and A-Type Granites in the Lower Yangtze River Belt, Eastern China: Implications for Petrogenesis and Metallogeny. Minerals. 2018; 8(8):328. https://doi.org/10.3390/min8080328
Chicago/Turabian StyleLiu, Lei, Geng Chu, Yanguang Li, Xiaoyong Yang, M. Santosh, and Qing Hu. 2018. "Mesozoic High- and Low-SiO2 Adakites and A-Type Granites in the Lower Yangtze River Belt, Eastern China: Implications for Petrogenesis and Metallogeny" Minerals 8, no. 8: 328. https://doi.org/10.3390/min8080328