Temporal evolution of granitic magmas in the Luanchuan metallogenic belt, east Qinling Orogen, central China: Implications for Mo metallogenesis

Dong, Li; Han, Jae‐Hoon; Zhang, Shouting; Yan, Changhai; Cao, Hong; Song, Yaowu

doi:10.1016/j.jseaes.2015.05.017

Cited by 29 publications

(13 citation statements)

References 70 publications

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“…There was also one inherited zircon with a 207 Pb/ 206 Pb age of 1,822 Ma. The ages of samples ZK0301‐KY02 and ZK0315‐KY08 were consistent within error, indicating that the ore‐forming porphyritic syenogranite was formed between 147.1 ± 1.3 and 148.0 ± 1.6 Ma, which agrees with the molybdenite Re–Os age of 146.2 ± 0.9 Ma (Li, Han, et al, ).…”

Section: Analytical Resultssupporting

confidence: 57%

“…This stage was closely associated with the Mo mineralization, and in comparison with the other stages, involved more intensive potassic alteration and silicification than the most exposed plutons. The emplacement age correlates well with the ore‐forming ages of the Yuku Mo–W deposit (146.2 ± 0.9 Ma; Li, Han, et al, ),the Nannihu–Sandaozhuang Mo–W deposit (156–141 Ma; Huang, Wu, Du, & He, ; Li et al, ; Xiang et al, ), the Shangfanggou Mo–Fe deposit (143.8 ± 2 to 145.8 ± 2 Ma; Li et al, ), and the Jiudinggou Mo deposit (141.1 ± 2.5 Ma; Zhang et al, ), within the range of error. As mentioned above, the granitic batholith is connected to the exposed plutons on the surface (Han et al, ) in the Luanchuan ore cluster, and Mo–W mineralization in all the Mo–W deposits was closely correlated with magmatic activity from 147.1 ± 1.3 to 148.0 ± 1.6 Ma.…”

Section: Discussionsupporting

confidence: 55%

“…Therefore, the preexisting rocks of the granitic batholith were formed between 2.1 and 1.7 Ga. Similar two‐stage Hf model ages ( t DM2 ) were also found for plutons in the SNCC, including the Huashan (2.0–1.8 Ga; Guo, Zhu, Li, Xu, et al, ), Heyu (2.0–1.7 Ga; Guo, Zhu, Li, Xu, et al, ), Taishanmiao pluton (2.3–1.3 Ga; Wang et al, ), Shibaogou (2.36–1.73 Ga; Yang et al, ), and Yuku (1.85–1.63 Ga; Li, Han, et al, ) plutons. The similar Hf isotopic characteristics led us to conclude that the Yuku concealed granitic batholith is related to a large‐scale crust‐accretion event between 2.2 and 1.8 Ga (Gao, Rudnick, Carlson, Mcdonough, & Liu, ; Zhang, Gao, & Zhang, ; Zhang, Zhang, & Tang, ).…”

Section: Discussionmentioning

confidence: 53%

“…As mentioned above, the timing of Mo–W mineralization (146.2 ± 0.9 Ma; Li, Han, et al, ) was almost coeval with the emplacement age of porphyritic syenogranite from 147.1 ± 1.3 Ma to 148.0 ± 1.6 Ma. Considering the regional tectonic evolution, this age corresponds with the tectonic transformation of the Qinling Orogen during the Mesozoic to Cenozoic (Meng & Zhang, ; Zhang et al, ; Zhu et al, ).…”

Section: Discussionmentioning

confidence: 63%

“…However, little research has been undertaken on the Yuku concealed Mo–W deposit. Researchers have only focused on the geochemical characteristics (Han et al, ), Re–Os age (146.2 ± 0.9 Ma; Li D. et al, 2015), and emplacement age of the early phase (154.1 ± 1.8 Ma; Li et al, ) of the granitic batholiths. In the present research, we mainly focus on the geologic characteristics of the Yuku concealed Mo–W deposit using drilling data, zircon LA‐ICP‐MS U–Pb ages, Lu–Hf isotopes, and geochemical data of the ore‐forming granites to (a) determine the characteristics of granitic magmatism and genesis of the Mo–W deposit, (b) predict the spatial and temporal distributions of Mo–W deposit, and provide further implication for mineral exploration.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical and geological characteristics of the granitic batholith and Yuku concealed Mo–W deposit at the southern margin of the North China Craton

et al. 2018

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Integrated gravity and magnetic prospecting in the Luanchuan ore cluster by the Henan Institute of Geological Survey has led to the recent discovery of the Yuku concealed porphyry Mo-W deposit. This research focuses on the geological, geochemical, and chronological features of the Yuku deposit, and it discusses the genesis of the deposit and its associated concealed granitic batholith. Skarn and/or hornfels occur in the contact zone between the granitic batholith and the wall rocks. The Mo mineralization is mostly hosted in porphyritic granites, whereas the large Mo-W deposits of the area (e.g., the Nannihu-Sandaozhuang Mo-W deposit) are mostly hosted in the skarn and hornfels. The laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating constrained three episodes of magmatic emplacement: (a) the porphyritic biotite monzogranite at 153.1 ± 1.2 Ma, (b) the ore-causative porphyritic syenogranite at 147.1 ± 1.3 to 148.0 ± 1.6 Ma, and (c) the last porphyritic monzogranite at 130.0 ± 1.3 Ma. The granitic batholiths have high contents of SiO 2 , Al 2 O 3 , and K 2 O + Na 2 O, obvious fractionation between the light and heavy rare earth elements [(La/Yb) N = 17.3-37.3], a negative Eu anomaly (δEu = 0.62-0.84), enrichment in Rb, Th, U, and Sr, and depletion of P and Ti. These features indicate the fractionation of plagioclase, amphibole, garnet, and rutile from the primary magmas or as residues in the source. The ε Hf (t) isotopic values of the zircons are concentrated between −21 and −13, with corresponding two-stage model ages (t DM2 ) between 2.1 and 1.7 Ga. The above characteristics indicate that the granitic batholiths were derived from the partial melting of the thickened lower crust during the Mesozoic to Cenozoic. The ore-forming fluids emplaced in the contact zone between the batholith and the wall rocks resulted in the metasomatic alteration and the deposition of Mo-W mineralization.

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Section: Analytical Resultssupporting

confidence: 57%

Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

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Geochemical and geological characteristics of the granitic batholith and Yuku concealed Mo–W deposit at the southern margin of the North China Craton

et al. 2018

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Triassic alkaline magmatism and mineralization in the Xiong'ershan area, East Qinling, China

et al. 2018

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The Qinling orogenic belt is a complex subduction-accretion-collision orogen that welded the North China Craton and the Yangtze Craton during the final continental collision in the Triassic. The Xiong'ershan area, located in east Qinling, exposes a typical Triassic syenite pluton and several contemporaneous Mo, Au, and Cu deposits. The aegirine-augite syenites and syenites from the Mogou pluton are characterized by alkalic to peralkalic (total alkali Na 2 O + K 2 O = 13.95-14.63 wt.%, CaO = 0.06-2.87 wt.%), and shoshonitic features (K 2 O = 11.86-14.34 wt.%). Zircon LA-ICP-MS U-Pb dating of the aegirine-augite syenite and syenite yield emplacement ages of 232.5 ± 0.6 and 221.8 ± 0.7 Ma, indicating multiple pulses of magmatism. Evidence from zircon Hf isotopes; occurrence of mafic microgranular enclaves; heterogeneous peralkaline composition; and wide ranges of MgO, Ni, and other trace elements suggest that the parental magma was mainly sourced from partial melting of Archean to Paleoproterozoic crustal sources, mixed with juvenile mantle-derived mafic magmas. The Mogou pluton was probably emplaced in the tectonic transition from syn-collision to post-collision settings and accompanying slab break-off process, from the commencement of collision at approximately 245 Ma and post-collisional extension at approximately 210 Ma. Gold, molybdenum, and copper deposits formed during the interval of 255-208 Ma, and the close temporal and spatial relationship between these Triassic polymetallic deposits and the Mogou alkaline pluton invokes a genetic linkage. The heat source for magmatismand related metallogeny is correlated to a hot upwelling asthenospheric mantle that caused partial melting of the Archean to Paleoproterozoic crustal basement, resulting in magma mixing between the two end-members.

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Genesis and fluid evolution of the Yuku porphyry Mo deposit, East Qinling orogen, China

Xue

Wang

et al. 2021

Geological Journal

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The Yuku is a large porphyry Mo deposit (1.5 Mt at 0.12% Mo) in the Luanchuan ore district of the East Qinling orogen, central China. The economic Mo ore bodies occur as veins, veinlets, and disseminated ore and are developed mainly within the late Mesozoic Yuku porphyritic granite. Molybdenum mineralization is generally associated with potassic and phyllic alteration. Hydrothermal processes in the Yuku deposit are divided into four stages: (I) a quartz–K‐feldspar–biotite ± pyrite stage, (II) a quartz–molybdenite ± pyrite ± K‐feldspar ± sericite stage, (III) a quartz–polymetallic sulphide stage, and (IV) a calcite ± quartz ± fluorite ± pyrite stage. The fluid evolution during these hydrothermal stages was constrained through systematic investigation of fluid inclusions (FIs) and H−O isotopes. Four types of primary or pseudosecondary FIs were recognized in hydrothermal quartz and calcite: two‐phase liquid‐rich inclusions (L‐type), two‐phase vapour‐rich inclusions (V‐type), halite‐bearing (hypersaline) inclusions (H‐type), and three‐phase CO2‐bearing inclusions (C‐type). FIs within Stages I–IV have homogenization temperatures of 375 to >550, 297–400, 198–298, and 149–188°C, with salinities of 0.53–13.18, 0.35–40.23, 5.11–11.81, and 5.71–9.73 wt% NaCl equiv., respectively. In Stage I, coexisting vapour‐rich (V‐type) and liquid‐rich (L‐type) FIs have similar homogenization temperatures (488 to >550°C) and distinct salinities, indicating fluid boiling during the formation of quartz–K‐feldspar–biotite veins at a pressure of 550–700 bar and a lithostatic depth of 2.3–2.8 km. In Stage II, FIs in quartz were also trapped under boiling conditions, as evidenced by coexisting hypersaline H‐type (34.13–40.23 wt% NaCl equiv.) and low‐salinity V‐type (0.35–2.24 wt% NaCl equiv.) inclusions, which formed at temperatures of 309–361°C and hydrostatic depths of 1.0–2.0 km, equivalent to pressures of 100–200 bar. During Stage III, the ore‐forming fluids were cooler (198–298°C) and more dilute (5.11–11.81 wt% NaCl equiv.) due to the involvement of meteoric water, with minimum trapping pressures estimated at <100–150 bar, corresponding to a hydrostatic depth of <1.0 km. In Stage IV, temperatures decreased further to 149–188°C, with lower salinities (5.71–9.73 wt% NaCl equiv.), indicating a post‐ore fluid stage. These data suggest that the mineralizing fluids forming the Yuku Mo deposit changed from early moderate‐ to low‐salinity CO2‐rich fluids in the H2O–NaCl–CO2 system that formed at high temperature and pressure, to late H2O–NaCl low‐salinity fluids that formed at low temperature and pressure. H−O isotopic compositions indicate that the mineralizing fluids had a dominantly magmatic signature but were diluted by meteoric waters. Combining our integrated analysis of the fluid evolution and deposit geology, we propose that fluid boiling and fluid–rock interaction, including intensive potassic alteration, changed the salinity and triggered CO2 escape, leading to a decrease in fO2 and an increase in the acidity of the ore‐forming fluids...

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Temporal evolution of granitic magmas in the Luanchuan metallogenic belt, east Qinling Orogen, central China: Implications for Mo metallogenesis

Cited by 29 publications

References 70 publications

Geochemical and geological characteristics of the granitic batholith and Yuku concealed Mo–W deposit at the southern margin of the North China Craton

Geochemical and geological characteristics of the granitic batholith and Yuku concealed Mo–W deposit at the southern margin of the North China Craton

Triassic alkaline magmatism and mineralization in the Xiong'ershan area, East Qinling, China

Genesis and fluid evolution of the Yuku porphyry Mo deposit, East Qinling orogen, China

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