Mesozoic multiphase magmatism at the Xinan Cu–Mo ore deposit (Zijinshan Orefield): Geodynamic setting and metallogenic implications

Xu, Cheng; Chen, Huayong; Huang, Wenting; Qi, Jing; Duan, Gan; Zhang, Lejun; Chao, Wu; Zhang, Shuang; Zhong, Wenbiao

doi:10.1016/j.oregeorev.2016.06.019

Cited by 23 publications

(11 citation statements)

References 63 publications

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“…Numerous studies showed that the Middle to Late Cretaceous (120–80 Ma) magmatic suites in South China, characterized by the extensively coeval mafic dikes (Liu, Mao, Pirajno, Jia, et al, 2018; Liu, Mao, Santosh, Xu, et al, 2018; Yang et al, 2018), formed in an extensional setting (e.g., He & Xu, 2012; Li et al, 2012; Xu et al, 2017; Zhao et al, 2016; Zhou et al, 2006; Zhou & Li, 2000), although the timing of the onset of such extension has remained equivocal. He and Xu (2012) suggested that there were two episodes of magmatism in south‐eastern China, that is, an early stage (140–110 Ma) in a compressional setting and a late stage (110–85 Ma) in an extensional setting.…”

Section: Discussionmentioning

confidence: 99%

Early Cretaceous tectonic transition in South China: Insights from felsic igneous rocks and mafic dikes, eastern Guangdong Province

2023

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Large‐scale magmatic activity and associated mineralization in South China are linked to the subduction of the palaeo‐Pacific Plate, although specific processes have remained controversial including the timing of subduction initiation and lithospheric extension. We present new geochemical data and zircon U–Pb and Lu–Hf isotope measurements on volcanic rocks, granites and mafic dikes from coastal south‐eastern China along the Eurasian continental margin. The biotite monzogranites show I–type granitoid affinity and fractional crystallization with zircon εHf(t) values ranging from −10.15 to +0.50, suggesting magma derivation from the melting of lower crust with the addition of juvenile crustal or mantle components. The biotite granites are typical of highly fractionated A‐type granites with εHf(t) values ranging from −3.63 to +1.35, indicating magma hybridization between anatectic granitic and mantle‐derived mafic magmas. The diabase dikes have zircon εHf(t) values ranging from −2.99 to +1.71, with high La/Nb and La/Ta ratios. This suggests derivation from partial melting of a lithospheric mantle metasomatized by fluid from a subducting–slab, with contributions of depleted asthenospheric mantle components. Our data, combined with those from previous studies, suggest that the shallow subduction of the palaeo–Pacific Plate beneath the Eurasian continent had begun by ca. ~170 Ma at least and the subduction orientation changed to oblique with respect to the continental margin. Steepening of the subduction angle likely caused a slab rollback during the Early Cretaceous, resulting in a tectonic transition from compression to extension in South China at ca. 145 Ma.

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Section: Discussionmentioning

confidence: 99%

Early Cretaceous tectonic transition in South China: Insights from felsic igneous rocks and mafic dikes, eastern Guangdong Province

2023

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“…As almost all the magmatic rocks in the Zijinshan area experienced intense alteration, attention has been focused on magmatic zircon studies. Previous studies on zircon U-Pb ages (Jiang et al 2013(Jiang et al , 2015Liang et al 2013;Yu et al 2013;;Xu et al 2017) have shown that the Mesozoic magmatic rocks in this area mainly include intrusive rocks from the Middle Jurassic and intrusive-volcanic rocks from the Early Cretaceous. This large-scale Late Mesozoic magmatic activity is closely related to the formation of Cu, Au, Fe, Pb, Zn and Ag mineral deposits (Chen, 1999;Zhang et al 2001;Mao et al 2006;Liang et al 2013;Jiang et al 2015;Li et al 2015;Duan et al 2017;Xu et al 2017).…”

Section: Introductionmentioning

confidence: 91%

“…Previous studies on zircon U-Pb ages (Jiang et al 2013(Jiang et al , 2015Liang et al 2013;Yu et al 2013;;Xu et al 2017) have shown that the Mesozoic magmatic rocks in this area mainly include intrusive rocks from the Middle Jurassic and intrusive-volcanic rocks from the Early Cretaceous. This large-scale Late Mesozoic magmatic activity is closely related to the formation of Cu, Au, Fe, Pb, Zn and Ag mineral deposits (Chen, 1999;Zhang et al 2001;Mao et al 2006;Liang et al 2013;Jiang et al 2015;Li et al 2015;Duan et al 2017;Xu et al 2017). The petrogenesis and magmatic evolution processes of the Zijinshan area Mesozoic magmatic rocks are still a topic of debate, with the contribution of mantle material being unclear.…”

Section: Introductionmentioning

confidence: 91%

“…Secondary ion mass spectrometry (SIMS) U–Pb ages of magmatic zircons from Mesozoic granitoids and mafic dikes show five separate episodes of magmatism (Zhang et al 2017): Early Proterozoic, Middle–Late Proterozoic, Silurian – Late Triassic, Late Jurassic and Early Cretaceous. Mesozoic Zijinshan magmatism occurred in two major phases: (1) Middle to Late Jurassic Zijinshan granitoids and (2) Early Cretaceous Shimaoshan volcanic rocks, Sifang granodiorite, porphyritic granodiorite and late aplite dykes (Xu et al 2017).…”

Section: Geological Background and Petrographymentioning

confidence: 99%

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Crust–mantle interactions in Zijinshan ore field identified by zircon SIMS U–Pb age and zircon Hf–O isotopes

Zhang

Yan²,

Wang³

2022

Geol. Mag.

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This study presents zircon U–Pb geochronology and Hf and O isotope data for granitic rocks in the Zijinshan ore field, southwestern Fujian Province, China. The intrusive rocks comprise monzogranite, granite and granodiorite. The magmatic zircon U–Pb ages from these granitic rocks can be divided into four episodes: episodes 1 (157.9–159.9 Ma) and 2 (141 Ma) in the Late Jurassic and episodes 3 (108.1–103.2 Ma) and 4 (97.5–99.7 Ma) in the Middle and Late Cretaceous, respectively. Patterns of rare-earth elements (REE) show enrichment in light REE and obvious negative Eu anomalies. These rocks are also enriched in Rb, Th, U, La, Ce, Nd and Hf, and depleted in Ba, Nb, Sr, P and Ti. The increasing La/Yb ratio and decreasing heavy REE content with decreasing age may imply an increasing contribution of mantle-derived materials from the Late Jurassic to Cretaceous. The zircon ϵHf(t) and δ18O values, ranging from −37.7 to −2.8 and 12.0 ‰ to 6.3 ‰, respectively, indicate that the lower crust is an important source of granitic rocks. There was a significant increase in ϵHf(t) values and a decrease in δ18O values in the younger magmatic episodes (3 and 4), which ranged from −11.4 to −0.6 and 10.7 to 6.3 ‰, respectively. This suggests an increasing contribution of mantle-derived magma to the crustal melts from the Late Jurassic to late Early Cretaceous in response to the changing regional tectonic setting from compression to extension and an increasing interaction between the crust and mantle.

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“…The commonly used technologies for high-resolution SWIR and nearinfrared mineral measurements include the Portable Infrared Mineral Analyzer (PIMA) from Australia, the TerraSpec ® Halo handheld analyzer developed by ASD in the United States, and the PNIRS system produced by the Nanjing Institute of Geology and Mineral Resources in China [4][5][6][7][8][9][10][11]. In recent years, SWIR spectroscopy has been successfully applied in the exploration and prospecting of porphyry, shallow low-temperature hydrothermal, and skarn-type deposits [4][5][6][7][12][13][14][15][16][17][18][19][20][21], and remarkable results have been achieved in the discovery of concealed ore bodies as well as the deep and peripheral mining areas [12][13][14][15][16][17][18][19][20][21]. SWIR spectroscopy is characterized by no need for sample preparation, short testing time, convenience, and speed.…”

Section: Introductionmentioning

confidence: 99%

Short-Wavelength Infrared Characteristics and Indications of Exploration of the Jiawula Silver–Lead–Zinc Deposit in Inner Mongolia

Wang,

Yang,

Fang

et al. 2024

Applied Sciences

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For the Jiawula lead–zinc deposit, as easily accessible resources become depleted, mines are becoming deeper to replenish ore reserves. Identifying large, continuous, and high-grade ore bodies in deep areas has become a daunting problem. Moreover, separating lead–zinc-bearing complex ore bodies from waste material and extracting them from associated minerals are also difficult. Thus, pioneering exploratory strategies and technological methodologies are required to make breakthroughs in mineral discovery. Based on extensive-scale structural lithofacies mapping, this paper uses short-wave infrared (SWIR) spectroscopy technology to investigate hydrothermal alteration minerals in the mining area. It has identified a total of 16 hydroxyl-bearing alteration minerals, including chlorite, muscovite, illite, calcite, ankerite, kaolinite, and smectite. These minerals establish zoning characteristics around the ore bodies and on their flanks. They comprise a segmented assemblage that follows the pattern of comb-textured quartz–illite–chlorite–carbonate → muscovite–illite–chlorite–ankerite → illite–smectite–chlorite → chlorite–kaolinite–calcite. Deep-zone illitization with a lower Al–OH absorbance peak wavelength (<2206 nm) and higher crystallinity indices (>1.1) and chloritization with higher Fe–OH absorbance peak wavelengths (>2254) and higher crystallinity indices (>3.0) are indicators of potential hydrothermal centers in the deeper regions. By finding hydrothermal centers and connecting their spatial distribution with existing ore bodies, a pertinent relationship between diabase + andesite, Fe-chlorite + illite, and high-grade mineralization has been established. They correspond well with the lithology-alteration mineralization. This research provides a basis for predicting the positioning of concealed ore bodies deep inside a mine or at the periphery.

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Mesozoic multiphase magmatism at the Xinan Cu–Mo ore deposit (Zijinshan Orefield): Geodynamic setting and metallogenic implications

Cited by 23 publications

References 63 publications

Early Cretaceous tectonic transition in South China: Insights from felsic igneous rocks and mafic dikes, eastern Guangdong Province

Early Cretaceous tectonic transition in South China: Insights from felsic igneous rocks and mafic dikes, eastern Guangdong Province

Crust–mantle interactions in Zijinshan ore field identified by zircon SIMS U–Pb age and zircon Hf–O isotopes

Short-Wavelength Infrared Characteristics and Indications of Exploration of the Jiawula Silver–Lead–Zinc Deposit in Inner Mongolia

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