| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
LI Shengxi, HE Bi, YANG Bo, WEI Zhifu, TAO Gang, GAN Baoping, ZHAO Fei, SUN Pingyuan, ZHAO Zhenguan, HUANG Pengfei. 2023. Zircon U-Pb geochronology and geochemistry of the Tagelake monzogranites in South Tianshan block: Constraints on crustal magmatic origin and tectonic setting[J]. Geology in China, 50(2): 622-639. doi: 10.12029/gc20190320001
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Zircon U-Pb geochronology and geochemistry of the Tagelake monzogranites in South Tianshan block: Constraints on crustal magmatic origin and tectonic setting
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Abstract
This paper is the result of geological survey engineering.
Objective The Tagelake strip pluton, outcropped at the south Tianshan terrane in Southwestern Tianshan orogenic belt, is composed of monzogranites. Determining the formation mechanism of the monzogranites has important implications for the crust-derived magma origin and the time limit of subduction and ocean basin closure in South Tianshan Mountains.
Methods In order to determine the formation mechanism of the monzogranites, detailed zircon U-Pb geochronology, major elements and trace elements were firstly conducted.
Results LA-ICP-MS zircon geochronology study reveals that the monzogranites in the Tagelake area crystallized at (284.0±1.9)-(284.3±3.2) Ma, indicative of an Early Permian pluton. The results of major elements and trace elements reveal that the monzogranites display the characteristics of A-type granite: (1) The contents of SiO2 (70.92%-72.78%), K2O+Na2O (7.91%-8.44%) and A/CNK (0.89-0.99) are high, indicating that monzogranites are metaluminous rock and belongs to the high potassium calcium alkaline series; (2) The monzogranites are enriched in LREE (196×10-6-280×10-6) and depleted in HREE (22.8×10-6-28.2×10-6). Negative Eu anomaly is obvious, with δEu values of 0.51-0.64, and the monzogranites are characterized by fractionated chondrite-normalized REE patterns; (3) The monzogranites are enriched in Rb, Th, K and other large ion lithophile elements and depleted in Nb, Ta, Zr, P, and other high field strength elements.
Conclusions Combined with the regional tectonic evolution, it is considered that the Tagelake monzogranites were formed in the post-collision tectonic setting.
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References
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LI Shengxi, HE Bi, YANG Bo, WEI Zhifu, TAO Gang, GAN Baoping, ZHAO Fei, SUN Pingyuan, ZHAO Zhenguan, HUANG Pengfei. 2023. Zircon U-Pb geochronology and geochemistry of the Tagelake monzogranites in South Tianshan block: Constraints on crustal magmatic origin and tectonic setting[J]. Geology in China, 50(2): 622-639. doi: 10.12029/gc20190320001
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Figure 1.
Distribution of the Late Paleozoic intrusive rocks in South Tianshan Mountains (modifed from Qin Qie, 2017)
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Figure 2.
Tectonic division in Western Tianshan Orogen (a, b, after Wang Zongxiu et al., 2018) and geological map of Tagelake area with sampling locations (c, d, modifed from the Second Institute of Geology and Minerals Exploration Team, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, 2018❶)
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Figure 3.
Scanned photo of specimens and photomicrographs of the monzogranites in Tagelake area
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Figure 4.
Cathodoluminescence images of representative zircon grains and zircon U−Pb isotopic concordia plots for the zircons of sample TW02 (a, b) and TW05 (c, d)
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Figure 5.
TAS (a), SiO2−K2O (b) and A/CNK−A/NK (c) diagrams of the monzogranites in Tagelake area (a after Mckenzie, 1989; b after Peccerillo and Taylor, 1976; c after Maniar and Piccoli, 1989)
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Figure 6.
Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) of monzogranites in Tagelake area (normalized values are from Sun and McDonough, 1989)
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Figure 7.
(Zr+Nb+Ce+Y)−FeOT/MgO (a), (Zr+Nb+Ce+Y)−(K2O+Na2O)/CaO (b) and K2O−Na2O diagrams (c) of the monzogranites in Tagelake area (a, b after Whalen et al., 1987; c after Zorpi et al., 1989)
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Figure 8.
SiO2−FeOT/(FeOT+MgO) and SiO2-(Na2O+K2O-CaO) diagrams of the monzogranites in Tagelake area (after Frost et al., 2001)
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Figure 9.
Y−Nb (a), Yb−Ta (b), Rb/30−Hf−Ta×3 (c) and Nb−Y−Ce (d) diagrams of the monzogranites in Tagelake area (a, b after Pearce et al., 1984; c after Harris et al., 1986; d after Eby, 1992)