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Source of ore-forming fluids of the Jiaojia deeply seated gold deposit: Evidences from trace elements and sulfur-helium-argon isotopes of pyrite.
Li Jie1,2,3; Song MingChun4; Liang JinLong5; Jiang MengYao2; Li ShiYong6; Ding ZhengJiang7; Su Fei8
Corresponding AuthorSong MingChun(
AbstractThe Jiaojia gold deposit is a typical representative altered rock type gold deposit in the Jiaodong Peninsula, with a gold reserve of more than 200 tons. The distribution of the vein-like orebodies is controlled by the Jiaojia Fault. The potash feldspathization, beresitization, silicification and carbonization are well developed in the country rock. Pyrite is the main gold-bearing mineral in the ore. The hydrothermal metallogenic period can be divided into four stages: (i) pyrite-quartz stage; (ii) gold-quartz-pyrite stage; (iii) gold-quartz-polymetallic sulfide stage; and (iv) quartz-carbonate stage. In this paper, we collected nine pieces of drilling hole samples at different depths (-600 similar to -1100m) from the No. I orebody of Jiaojia deeply-seated gold deposit. The trace elements and S-He-Ar isotopic compositions of the pyrites in these samples are analyzed, and the compositions, properties and sources of their ore-forming fluids are discussed. It is found that the pyrites of the No. I orebody are light yellow, with strong metallic luster, euhedral-granular hypidiomorphic-granular textures, and they ocuured as disseminated grains with sizes of 50 - 1000 mu m or veined assemblages in sericitized cataclastic rocks, which are taken as minerals of the gold -quartz -pyrite metallogenic stage ( ii). The contents of their REE are relatively low and enriched in LREE, with Sigma REE of 3. 27 x 10(-6) similar to 38. 5 x 10(-6), delta Ce values of 0. 81 similar to 1. 05, delta Eu values of 0. 67 similar to 1. 43 and the ratios of Th/La, Nb/La less than 1, indicating the ore -forming fluids might be Cl-rich reduced fluids. The Co/Ni ratios of the pyrites range from 0.54 to 1. 57, with an average value of 0.99, these ratios are close to average values of those from metamorphic-hydrothermal type gold deposit. The Y/Ho ratios range from 21. 9 to 35. 5, coincident with the mantle (25 similar to 30) and the continental crust of eastern China (20 similar to 35), indicating that the ore -forming fluids were related to the crust -mantle interaction. The Y/ Ho, Zr/HF and Nb/Ta values vary in a wide range, indicating that the metasomatism or the addition of external hydrothermal solution. Compared with the continental crust, pyrite is rich in chalcophile elements and siderophile elements such as Cu, Pb, Zn, Cd, Co, Ni, and depleted of high field strength elements ( HESE). The delta S-34 values of the pyrites in the Jiaojia deeply-seated gold deposit vary within a range between 7. 5 parts per thousand and 9. 8 parts per thousand, with an average value of 8. 7 parts per thousand, which is lower than that of shallow deposit, showing the characteristics of decreasing 8345 value from shallow to deep. The sulfur isotopic compositions of the Jiaodong gold deposits are similar as a whole, the delta S-34 values of most deposits are positive, and vary mainly in the range of 6 parts per thousand similar to 12 parts per thousand. The source of delta S-34 is related to the ancient metamorphic basement rocks, Mesozoic granites and mantle -derived fluids. The published data showed that the variations of the delta S-34 values in this area are in this order: quartz vein type < sulfide quartz vein type < altered rock type, which means that the difference of metallogenic type is the most important factor causing the different sulfur isotopic compositions. The He-3/He-4 values of the pyrites are 1. 6 +/- 0. 1Ra similar to 1. 8 +/- 0. 1Ra, and their Ar-40/Ar-36 values are 750 similar to 3106, showing the characteristics of a mixed source. The proportion of mantle -derived helium is 20% similar to 22%, which indicate that mantle -derived fluids are involved in the metallogenic process. The mineralization of the Jiaojia gold deposit is closely related to the strong crust -mantle interaction in eastern China in the Late Yanshanian Period.
KeywordThe Jiaojia gold deposit Pyrite Helium and Argon isotope Sulfur isotope Ore-forming fluid Trace elements
Indexed BySCI
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000533247400023
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorSong MingChun
Affiliation1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Hebei GEO Univ, Sch Resources, Shijiazhuang 050031, Hebei, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
4.Shandong Prov 6 Explorat Inst Geol & Mineral Reso, Weihai 264209, Peoples R China
5.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China
6.Shandong Inst Geophys & Geochem Explorat, Jinan 250013, Peoples R China
7.Shandong Bur Geol & Mineral Resources Explorat &, Jinan 250013, Peoples R China
8.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Jie,Song MingChun,Liang JinLong,et al. Source of ore-forming fluids of the Jiaojia deeply seated gold deposit: Evidences from trace elements and sulfur-helium-argon isotopes of pyrite.[J]. ACTA PETROLOGICA SINICA,2020,36(1):297-313.
APA Li Jie.,Song MingChun.,Liang JinLong.,Jiang MengYao.,Li ShiYong.,...&Su Fei.(2020).Source of ore-forming fluids of the Jiaojia deeply seated gold deposit: Evidences from trace elements and sulfur-helium-argon isotopes of pyrite..ACTA PETROLOGICA SINICA,36(1),297-313.
MLA Li Jie,et al."Source of ore-forming fluids of the Jiaojia deeply seated gold deposit: Evidences from trace elements and sulfur-helium-argon isotopes of pyrite.".ACTA PETROLOGICA SINICA 36.1(2020):297-313.
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