Heavy halogen compositions of lamprophyres derived from metasomatized lithospheric mantle beneath eastern North China Craton

Zheng, Yixin; Wang, Zaicong; He, Tao; Burgess, Ray; Zhu, Zhaoxian; Wang, Lian-Xun; Wang, Xiang; Hu, Zhaochu; Liu, Yongsheng

doi:10.2138/am-2022-8693

American Mineralogist

2023

DOI: 10.2138/am-2022-8693

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Heavy halogen compositions of lamprophyres derived from metasomatized lithospheric mantle beneath eastern North China Craton

Yixin Zheng,

Zaicong Wang,

Tao He

et al.

Abstract: Halogens and other volatiles are widely recycled into the deep mantle by subduction and are key components to metasomatize the sub-continental lithospheric mantle (SCLM).Lamprophyres are well-known to be rich in volatiles and are important for understanding the halogen characteristics of the metasomatized SCLM and/or the mobilization of This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.

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Cited by 3 publications

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Heavy halogen compositions of peridotite massifs in the Ivrea-Verbano Zone and implications for strong modification of mantle rocks

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Wang,

Burgess

et al. 2024

Chemical Geology

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Heavy halogen compositions of peridotite massifs in the Ivrea-Verbano Zone and implications for strong modification of mantle rocks

Zheng,

Wang,

Burgess

et al. 2024

Chemical Geology

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Hydrothermally synthesized nitrogen-doped hydrochar from sawdust biomass for supercapacitor electrodes

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International Journal of Electrochemical Science

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Copper skarn mineralization related to reduced monzodioritic magma at the Huanren deposit, northeastern China

Ouyang,

Caulfield,

Xie

et al. 2024

Geological Society of America Bulletin

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Most known copper (Cu) skarns are associated with oxidized intrusions. In this contribution, we report a Cu skarn associated with a reduced monzodioritic intrusion at Huanren, northeastern China, which contains 0.41 Mt of Cu accompanied by economic concentrations of Zn, Pb, Fe, Mo, and Ag. Copper-polymetallic mineralization in the Huanren deposit is concentrated in skarns located between the contacts of the monzodiorite (SiO2 = 52−55 wt%) and the Cambrian carbonate rocks, with minor molybdenite-bearing veinlets/veins and dissimilated chalcopyrite mineralization hosted within the monzodiorite. Laser ablation−inductively coupled plasma−mass spectrometry (LA-ICP-MS) U-Pb zircon geochronology indicates the monzodiorite crystallized at 125.4 ± 0.6 Ma (2σ). Isotope dilution (ID)-ICP-MS Re-Os molybdenite geochronology indicates mineralization at Huanren occurred at 125.3 ± 0.8 Ma (2σ). Whole-rock major- and trace-element and zircon Hf isotopic compositions suggest enriched (subduction metasomatized) lithospheric mantle−derived sources for the parental magma of the monzodiorite without significant crustal assimilation. Zircon trace-element and magmatic apatite major-element compositions indicate the reduced nature of the monzodiorite, as evidenced by low magmatic oxygen fugacity (fayalite-magnetite-quartz [FMQ] buffer = 1.09 ± 0.19) and negligible apatite SO3 contents (<0.05 wt%). A reduced magmatic-hydrothermal system at Huanren is also supported by the predominance of magmatic ilmenite over magnetite in the monzodiorite and by the presence of pyrrhotite and the absence of anhydrite and hematite in the ore. Chalcopyrite from the Huanren deposit has an average δ34S value of 4.34‰ ± 0.88‰ (1σ), which is clearly higher than values from most porphyry-skarn Cu ± Mo ± Au deposits. Accordingly, we suggest that interaction between (1) external oxidized fluids equilibrated with evaporites and (2) reduced Cl-bearing magmas and related exsolved fluids may have played a critical role in the formation of the Huanren Cu skarn by increasing the ability of fluids to scavenge Cu from the reduced magma and subsequently precipitate Cu in the carbonate rocks. This study defines a new type of Cu skarn and thereby opens new potential for Cu skarn exploration proximal to intrusive units previously deemed too reduced to be Cu fertile, especially in non-arc settings. Moreover, we conclude that the availability of Cl and S in magmatic-hydrothermal systems may be as critical as fO2 in facilitating the actual ore-forming event in Cu skarn systems.

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Heavy halogen compositions of lamprophyres derived from metasomatized lithospheric mantle beneath eastern North China Craton

Cited by 3 publications

References 125 publications

Heavy halogen compositions of peridotite massifs in the Ivrea-Verbano Zone and implications for strong modification of mantle rocks

Heavy halogen compositions of peridotite massifs in the Ivrea-Verbano Zone and implications for strong modification of mantle rocks

Hydrothermally synthesized nitrogen-doped hydrochar from sawdust biomass for supercapacitor electrodes

Copper skarn mineralization related to reduced monzodioritic magma at the Huanren deposit, northeastern China

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