Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis
Abstract
:1. Introduction
2. Geological Setting
3. Samples and Analytical Methods
3.1. Whole-Rock Major and Trace Elements
3.2. LA-ICP-MS Zircon U–Pb Dating and In Situ Trace Element Analysis of Zircon
3.3. Zircon Lu–Hf Isotope Analysis
4. Results
4.1. Major and Trace Elements Geochemistry
4.2. Zircon U–Pb Geochronology
4.3. Zircon Lu–Hf Isotopes
4.4. Zircon Trace Elements
5. Discussion
5.1. Petrogenesis of the Dacocheng Batholith
5.2. Magma Mixing
5.3. Implications for Regional Metallogenic Distinctions Between NYA and SYA
6. Conclusions
- (1)
- The host granodiorite and MMEs from the Daocheng batholith were formed at ca. 215 Ma and ca. 214 Ma, respectively; they were coeval within errors, indicating that they were the products of contemporaneous magmatic activity in the Late Triassic.
- (2)
- The Late Triassic Daocheng granodiorite is metaluminous to just peraluminous, high-K calc-alkaline I-type granite, and derived from the partial melting of Mesoproterozoic igneous arc lower crust.
- (3)
- The abundant MMEs occurred mainly in granodiorite and K-feldspar megacrystic granite and had a typical granular texture. The MMEs were characterized by quenched apatite, quartz eyes and the contents of MgO, Al2O3 and Fe2O3 were negatively correlated with SiO2 content. The MMEs were generated by the incomplete mixing of the mafic magma with felsic magma.
- (4)
- The Daocheng granodiorite had much lower zircon Ce4+/Ce3+ (average of 3.53) and fO2 values (average of ∆FMQ = −10.84) than those of ore-bearing quartz monzonite porphyry (average of Ce4+/Ce3+ = 52.10; ∆FMQ = 2.8) in the Pulang copper deposit. Thus in this comparative study it was clear that during the Late Triassic in the Yidun Arc, the high oxygen fugacity of the magma was conducive to mineralization.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample no. | DC16-6 | DC16-9 | DC16-5 | DC16-8 |
---|---|---|---|---|
Lithology | Granodiorite | MMEs | ||
SiO2 | 67.90 | 70.54 | 56.34 | 60.91 |
TiO2 | 0.41 | 0.42 | 0.62 | 0.72 |
Al2O3 | 15.66 | 14.41 | 17.98 | 16.06 |
FeO | 2.33 | 2.55 | 5.05 | 5.30 |
TFe2O3 | 3.11 | 3.27 | 6.76 | 6.55 |
MnO | 0.07 | 0.06 | 0.20 | 0.17 |
MgO | 1.29 | 1.08 | 3.20 | 2.89 |
CaO | 3.02 | 3.22 | 6.09 | 6.18 |
Na2O | 3.20 | 3.18 | 3.80 | 3.50 |
K2O | 4.59 | 3.28 | 3.93 | 2.31 |
P2O5 | 0.16 | 0.08 | 0.40 | 0.13 |
LOI | 0.57 | 0.43 | 0.64 | 0.57 |
total | 99.98 | 99.98 | 99.96 | 99.98 |
K2O + Na2O | 7.79 | 6.46 | 7.73 | 5.81 |
K2O/Na2O | 1.43 | 1.03 | 1.03 | 0.66 |
A/CNK | 1.00 | 0.98 | 0.83 | 0.82 |
A/NK | 1.53 | 1.64 | 1.71 | 1.95 |
Mg# | 45 | 39 | 48 | 46 |
DI | 77 | 76 | 57 | 56 |
Li | 30.5 | 30.4 | 32.5 | 40.5 |
Be | 2.11 | 2.02 | 3.68 | 2.39 |
Sc | 8.65 | 9.84 | 22.50 | 24.20 |
V | 59 | 37 | 154 | 91.9 |
Cr | 12.7 | 16.8 | 13.2 | 46.1 |
Co | 6.10 | 6.35 | 14.20 | 14.90 |
Ni | 6.16 | 5.19 | 12.90 | 11.60 |
Cu | 8.22 | 4.38 | 20.60 | 16.00 |
Zn | 39.7 | 46.8 | 74.0 | 85.5 |
Rb | 168 | 121 | 177 | 125 |
Sr | 457 | 144 | 379 | 131 |
Y | 19.3 | 25.1 | 63 | 36.7 |
Zr | 224 | 186 | 233 | 240 |
Nb | 16.6 | 11.5 | 25.6 | 15.2 |
Cs | 4.02 | 4.48 | 5.23 | 6.13 |
Ba | 1516 | 562 | 834 | 522 |
La | 51.8 | 30.3 | 22.5 | 12 |
Ce | 87.4 | 54.4 | 57.2 | 26.3 |
Pr | 9.24 | 6.13 | 9.08 | 3.92 |
Nd | 32.2 | 24.6 | 41.8 | 17.7 |
Sm | 5.47 | 4.72 | 11.8 | 5.33 |
Eu | 1.12 | 0.97 | 1.14 | 0.88 |
Gd | 4.26 | 4.29 | 10.90 | 5.27 |
Tb | 0.68 | 0.80 | 2.00 | 1.06 |
Dy | 3.54 | 4.43 | 11 | 6.16 |
Ho | 0.63 | 0.85 | 2.03 | 1.23 |
Er | 1.90 | 2.56 | 6.12 | 3.77 |
Tm | 0.30 | 0.42 | 0.98 | 0.64 |
Yb | 1.96 | 2.58 | 6.56 | 4.33 |
Lu | 0.30 | 0.40 | 0.92 | 0.65 |
Hf | 6.07 | 5.69 | 6.6 | 6.82 |
Ta | 1.17 | 1.05 | 1.76 | 1.38 |
Pb | 20.9 | 20.1 | 22.6 | 17 |
Th | 44.3 | 12.6 | 14.8 | 10.9 |
U | 8.14 | 2.59 | 6.99 | 3.59 |
ΣREE | 220.11 | 162.55 | 247.02 | 125.94 |
LREE/HREE | 5.70 | 2.92 | 1.39 | 1.11 |
(La/Yb)N | 18.96 | 8.42 | 2.46 | 1.99 |
Eu/Eu* | 0.68 | 0.65 | 0.30 | 0.50 |
Sr/Y | 23.68 | 5.74 | 6.02 | 3.57 |
Sample | Ti (ppm) | T (°C) | Ce4+/Ce3+ | 104/T (K) | δCe | Log(fO2) | △FMQ |
---|---|---|---|---|---|---|---|
DC16-8-02 | 11.38 | 810 | 5.70 | 9.24 | 7.49 | −17.52 | −2.98 |
DC16-8-04 | 8.43 | 779 | 24.98 | 9.51 | 46.43 | −12.07 | 3.14 |
DC16-8-07 | 11.88 | 814 | 5.46 | 9.20 | 7.24 | −17.44 | −3.00 |
DC16-8-08 | 11.36 | 810 | 18.72 | 9.24 | 33.97 | −11.84 | 2.70 |
DC16-8-11 | 9.70 | 793 | 16.41 | 9.38 | 30.14 | −13.04 | 1.86 |
DC16-8-13 | 8.74 | 783 | 14.27 | 9.47 | 22.12 | −14.69 | 0.44 |
DC16-8-14 | 9.22 | 788 | 12.82 | 9.43 | 20.75 | −14.68 | 0.33 |
DC16-8-16 | 8.80 | 783 | 26.54 | 9.47 | 53.80 | −11.32 | 3.80 |
DC16-8-18 | 9.80 | 794 | 30.52 | 9.37 | 60.57 | −10.36 | 4.51 |
DC16-8-19 | 11.68 | 813 | 5.60 | 9.21 | 7.70 | −17.29 | −2.81 |
DC16-8-20 | 12.57 | 820 | 9.96 | 9.15 | 18.86 | −13.58 | 0.74 |
DC16-8-22 | 5.99 | 746 | 21.21 | 9.82 | 32.17 | −15.06 | 0.92 |
DC16-9-02 | 5.63 | 740 | 6.59 | 9.87 | 6.76 | −21.22 | −5.09 |
DC16-9-05 | 2.58 | 672 | 1.82 | 10.58 | 1.42 | −30.76 | −12.88 |
DC16-9-06 | 1.98 | 651 | 6.13 | 10.82 | 4.24 | −27.90 | −9.42 |
DC16-9-10 | 5.67 | 741 | 0.80 | 9.87 | 1.31 | −27.34 | −11.24 |
DC16-9-12 | 0.59 | 567 | 6.57 | 11.91 | 4.99 | −32.95 | −11.74 |
DC16-9-15 | 1.50 | 630 | 8.95 | 11.07 | 7.61 | −27.02 | −7.90 |
DC16-9-17 | 4.59 | 721 | 1.15 | 10.06 | 1.29 | −28.41 | −11.83 |
DC16-9-18 | 2.12 | 657 | 2.60 | 10.76 | 1.80 | −30.79 | −12.47 |
DC16-9-19 | 3.51 | 698 | 1.80 | 10.30 | 1.50 | −29.09 | −11.91 |
DC16-9-20 | 5.19 | 733 | 0.95 | 9.95 | 1.56 | −27.11 | −10.80 |
DC16-9-21 | 2.46 | 668 | 5.30 | 10.62 | 4.40 | −26.74 | −8.75 |
DC16-9-22 | 2.39 | 666 | 1.32 | 10.65 | 1.23 | −31.64 | −13.59 |
DC16-9-23 | 2.06 | 655 | 1.87 | 10.78 | 1.47 | −31.66 | −13.28 |
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Zhang, R.-G.; He, W.-Y.; Gao, X. Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis. Minerals 2019, 9, 608. https://doi.org/10.3390/min9100608
Zhang R-G, He W-Y, Gao X. Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis. Minerals. 2019; 9(10):608. https://doi.org/10.3390/min9100608
Chicago/Turabian StyleZhang, Rui-Gang, Wen-Yan He, and Xue Gao. 2019. "Geochronology, Oxidization State and Source of the Daocheng Batholith, Yidun Arc: Implications for Regional Metallogenesis" Minerals 9, no. 10: 608. https://doi.org/10.3390/min9100608