The Mangling intrusive complex has different dioritic to granitic phases and is spatially and temporally related to molybdenum deposits in the Qinling Orogen. Zircon U-Pb dating of the Mangling intrusive complex indicates that dioritic rocks (biotite diorite and biotite diorite enclave; ca. 150−147 Ma) formed earlier than granitic rocks (medium- to fine-grained and fine-grained monzogranite and K-feldspar granite; ca. 145−141 Ma). The Mangling dioritic rocks exhibit large ion lithosphere element (e.g., Rb) and light rare earth element enrichment and high field strength element (e.g., Nb, Ta, and Ti) depletion. They have low to moderate SiO2 (51.33−58.16 wt%), high MgO (3.10−4.75 wt%) and Mg# (48−60), and negative zircon εHf(t) values (−11.6 to −6.8), suggesting origination from the continental lithospheric mantle that may have been metasomatized by previous sediment-derived melts and slab-derived fluids constrained by high Nb/Y, Th/Yb, and Rb/Y ratios. The Mangling granitic rocks are I-type granites and have high SiO2 (67.90−81.88 wt%) and low MgO (0.16−0.74 wt%). They have low and negative zircon εHf(t) values (−18.7 to −1.9) and old zircon Hf two-stage model ages (2334−1287 Ma), as well as similar mineral fractionation (e.g., hornblende, biotite, sphene, and apatite) with the Mangling dioritic rocks, indicating that they were derived from the remelting of old crustal rocks (e.g., Xiong’er and Kuanping groups) by the evolved underplated mafic magma. Compared with the Taoguanping mineralized monzogranite in the Northern Qinling Belt, zircon geochemistry (e.g., Ce4+/Ce3+, Eu/Eu*, and ΔFMQ [relative fayalite-magnetite-quartz buffer]) indicates that magma of the Mangling intrusive complex (except the biotite diorite) has high oxygen fugacity and small fractionated granitic intrusions, which are coeval with the biotite diorite enclave or younger than the Mangling granitic rocks, may have potential for generating porphyry molybdenum mineralization. The combination of this study and previous studies corroborates that the Qinling Orogen underwent an intracontinental orogenic evolution in a post-collisional compression to extension transitional setting during the Late Jurassic to Early Cretaceous, affected by far-field Paleo-Pacific slab subduction.
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Research Article|
May 12, 2023
Geochronology, petrogenesis, and magmatic oxidation state of the Mangling intrusive complex, Northern Qinling Belt, Central China: Implications for magma fertility and tectonic setting
Liandang Zhao;
Liandang Zhao
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China2
Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an University, Xi’an 710054, China3
Xi’an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals, Xi’an 710054, China
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Xiaotong Zheng;
Xiaotong Zheng
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
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Jiangang Jiao;
Jiangang Jiao
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China2
Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an University, Xi’an 710054, China3
Xi’an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals, Xi’an 710054, China
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Feng Han;
Feng Han
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China4
Baiyin Mineral Exploration Institute of Gansu Non-ferrous Metal Geological Exploration Bureau, Baiyin 730900, China
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Bin Zhou;
Bin Zhou
5
Shaanxi Geological Survey Planning Research Center, Xi’an 710068, China6
Shaanxi Geological Survey Fund Center, Xi’an 710068, China
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Peng Fan;
Peng Fan
5
Shaanxi Geological Survey Planning Research Center, Xi’an 710068, China6
Shaanxi Geological Survey Fund Center, Xi’an 710068, China
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Li Jia;
Li Jia
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
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Yunfei Ma
Yunfei Ma
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
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Liandang Zhao
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China2
Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an University, Xi’an 710054, China3
Xi’an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals, Xi’an 710054, China
Xiaotong Zheng
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
Jiangang Jiao
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China2
Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an University, Xi’an 710054, China3
Xi’an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals, Xi’an 710054, China
Feng Han
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China4
Baiyin Mineral Exploration Institute of Gansu Non-ferrous Metal Geological Exploration Bureau, Baiyin 730900, China
Bin Zhou
5
Shaanxi Geological Survey Planning Research Center, Xi’an 710068, China6
Shaanxi Geological Survey Fund Center, Xi’an 710068, China
Peng Fan
5
Shaanxi Geological Survey Planning Research Center, Xi’an 710068, China6
Shaanxi Geological Survey Fund Center, Xi’an 710068, China
Li Jia
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
Yunfei Ma
1
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
Publisher: Geological Society of America
Received:
09 Aug 2022
Revision Received:
14 Dec 2022
Accepted:
23 Feb 2023
First Online:
12 May 2023
Online ISSN: 1943-2674
Print ISSN: 0016-7606
© 2023 Geological Society of America
GSA Bulletin (2023)
Article history
Received:
09 Aug 2022
Revision Received:
14 Dec 2022
Accepted:
23 Feb 2023
First Online:
12 May 2023
Citation
Liandang Zhao, Xiaotong Zheng, Jiangang Jiao, Feng Han, Bin Zhou, Peng Fan, Li Jia, Yunfei Ma; Geochronology, petrogenesis, and magmatic oxidation state of the Mangling intrusive complex, Northern Qinling Belt, Central China: Implications for magma fertility and tectonic setting. GSA Bulletin 2023; doi: https://doi.org/10.1130/B36714.1
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