| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
GU Yuchao, CHEN Renyi, JIA Bin, SONG Wanbing, YU Changtao, JU Nan. 2017. Zircon U-Pb dating and geochemistry of the syenogranite from the Bianjiadayuan Pb-Zn-Ag deposit of Inner Mongolia and its tectonic implications[J]. Geology in China, 44(1): 101-117. doi: 10.12029/gc20170108
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Zircon U-Pb dating and geochemistry of the syenogranite from the Bianjiadayuan Pb-Zn-Ag deposit of Inner Mongolia and its tectonic implications
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Abstract
In this study, a series of analyses such as LA-ICP-MS zircon U-Pb isotopic dating and major elements, trace elements and Sr-Nd isotope composition investigation were performed for the syenogranite located in the deep layer of the Bianjiadayuan Pb-Zn-Ag polymetallic deposit, Inner Mongolia. Formed during the magmatic concentration period of early Cretaceous in southern Da Hinggan Mountains, the syenogranite in this deposit has age of (140.31±0.34) Ma. There were at least two periods of magmatic activity in the study area:Acid magma invaded in the early period, whereas intermediate magma and basic magma invaded about 10 Ma later. Ore-forming and rock-forming activities occurred over the same period. Geochemistry of major elements in the syenogranite is characterized by high SiO2 and K2O and low MgO, CaO and TiO2 with A/CNK ratio between 0.98 and 1.19, suggesting metaluminous-weakly peraluminous series. The syenogranite is enriched in LILE such as Rb, Th, U and K and depleted in HFSE such as Sr, P and Ti. The ΣREE values are slightly high. The δEu lies between 0.12 and 0.14, exhibiting significant negative Eu anomalies. The initial ratio of (87Sr/86Sr)i is between 0.7066 and 0.7077, while the initial ratio of (143Nd/144Nd)i is between 0.5121 and 0.5122 (t=140 Ma); εNd(t) values vary in the range of-5.0 to-6.6. Therefore, the petrogenetic materials were the products of partial melting of mafic-ultramafic source rock in middle Proterozoic lower crust. The analyses reveal that the syenogranite in the Bianjiadayuan deposit is A-type granite formed in the environment of high temperature and low pressure with the impact of the post-orogenic extension of Mongolia-Okhotsk scissor-type closed orogeny and lithospheric thinning in early Cretaceous. The high temperature and low pressure environment was probably related to the regional lithosphere demolition effect.
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GU Yuchao, CHEN Renyi, JIA Bin, SONG Wanbing, YU Changtao, JU Nan. 2017. Zircon U-Pb dating and geochemistry of the syenogranite from the Bianjiadayuan Pb-Zn-Ag deposit of Inner Mongolia and its tectonic implications[J]. Geology in China, 44(1): 101-117. doi: 10.12029/gc20170108
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Figure 1.
Regional geological map of the southern section of Da Hinggan Mountains, showing distribution of ore deposits (modified from Chu et al., 2001)
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Figure 2.
Geological map of the Bianjiadayuan lead and zinc polymetallic deposit, Inner Mongolia (modified from No. 243 Party of Inner Mongolia Nuclear Geology, 2011❶)
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Figure 3.
The photographs (a) and microscope photographs (b) of syenogranite from the Bianjiadayuan lead and zinc polymetallic deposit
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Figure 4.
Cathodoluminescence (CL) images and test positions of representative zircons from the syenogranite in the Bianjiadayuan lead and zinc polymetallic deposit
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Figure 5.
U-Pb concordia diagrams for zircons of the syenogranite from the Bianjiadayuan lead and zinc polymetallic deposit
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Figure 6.
SiO2-Alkaliclassification diagram (a, after Middlemost, 1994) and SiO2-K2O diagram (b, after Peccerillo & Taylor, 1976) of syenogranite from the Bianjiadayuan lead and zinc polymetallic deposit
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Figure 7.
Primitive mantle-normalized trace element patterns (a) and chondrite-normalized REE patterns (b) of syenogranite from the Bianjiadayuan lead and zinc polymetallic deposit (chondrite and primitive mantle normalized data after Sun and McDonough, 1989)
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Figure 8.
Sr-Yb diagram (a) and A1 and A2 classification diagram of granite (b c d, after Eby, 1992) of syenogranite from Bianjiadayuan
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Figure 9.
Diagrams of (87Sr/86Sr)i-1/Sr (a), εNd(t)-1/Nd (b) and (87Sr/86Sr)i-εNd(t) (c, after Wu et al., 1999) of syenogranite from the Bianjiadayuan lead and zinc polymetallic deposit
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Figure 10.
p-t diagram (a, after Zhang, 2014), lg[CaO/(K2O+Na2O)-SiO2] diagram (b, after Brown, 1982), Rb-Y+Nb diagram (c, after Pearce et al., 1984) and R1-R2 diagram (d, after Batchelor et al., 1985) of syenogranite from the Bianjiadayuan lead and zinc polymetallic deposit (c):