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Genesis of the Huaniushan Pb-Zn-Ag deposit in Gansu: Constraints from in situ S, Pb isotopes and trace elements
Du ZeZhong1,2; Yu XiaoFei1,2; Sun HaiRui1,2; Du YiLun1,2; Kang Kai3
2021-06-01
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume37Issue:6Pages:1813-1829
AbstractThe Huaniushan Pb-Zn-Ag deposit in the Beishan area of Gansu Province is located in the middle segment of Central Asian Orogenic Belt. Based on detailed field observation and laboratory identification, the metallogenic stage of the Huniushan Pb-Zn-Ag deposit is divided into two stages quartz-arsenopyrite-pyrrhotite (stage I) and quartz-polymetallic sulfide (stage II). The pyrite can be further divided into three types, namely colloidal pyrite of type (Py 0), pyrite of 2nd type with the characteristic of hydrothermal superimposition (Py I), and hydrothermal pyrite of the third type (Py II). The study of in-situ sulfur isotopes of pyrite and pyrrhotite indicates that the delta S-34 value of sulfide increases gradually in succession, and shows a characteristic trend of gradual evolution to magmatic sulfur. The delta S-34 values of colloidal pyrites vary within a range of -9.37 parts per thousand similar to -8.10 parts per thousand, with characteristics of sedimentary (biogenic) sulfur; the delta S-34 values of the sulfides in the first and second stages of mineralization are within -9.03 similar to -7.03 parts per thousand and -5.77 parts per thousand similar to -4.88 parts per thousand, respectively. The metallogenic stage is characterized by the mixed source of sedimentary sulfur and magmatic sulfur. The study of in-situ lead isotope of pyrite and pyrrhotite indicates that the variation range of Pb-206/Pb-204, Pb-207/ (204)pb, Pb-208/Pb-204 and the characteristic values of lead isotopes such as mu and omega of sulfides during the mineralization period are narrow. The lead source is a crust-mantle mixed source related to magmatism. It is similar to the Late Triassic granite feldspar lead from the crust -mantle mixed source, and is also similar to the lead isotopic composition of the skarn-type gold sulfide ore controlled by the Late Triassic granite. The study of in-situ trace elements of pyrites indicates that the Co/Ni and S/Se ratios of Py0 are 0.004 similar to 0.34 and 3.43 x 10(4) similar to 34.84 x 10(4), respectively, and the mass fraction of Se is 1.558 x 10(-6) similar to 15.82 x 10(-6), showing the characteristics of sedimentary pyrite; The Co/Ni and S/Se ratios of Py I with the characteristic of hydrothermal superimposition are 0.052 similar to 3.38 and 0.05 x 10(4) similar to 5.38 x 10(4), and the mass fraction of Se is 10.09 x 10(-6) similar to 1070 x 10(-6). These values are widely distributed, which are different from those of sedimentary pyrites and similar to those of hydrothermal pyrites. The Co/Ni ratio of Py II is within 0.60 similar to 68.88 with a mass fraction of Se varying within 5.938 x 10(-6) similar to 35.91 x 10(-6), and a S/Se ratio of 1.46 x 10(4) similar to 9.15 x 10(4), showing the characteristics of hydrothermal origin; PyI is a transitional type between Py0 and PyII, which exhibited the characteristic of hydrothermal superimposition. In conclusion, we inferred that the formation of Huaniushan deposit has experienced the pyrite depositional period of Nanhua-Sinian and the magmatic hydrothermal mineralization period of Late Triassic. Colloidal pyrite provide a few sulfur for mineralization, but the ore-forming metal materials mainly come from ore-forming hydrothermal fluid of the Late Triassic magmatic, and the origin of the deposit is considered to be magmatic hydrothermal deposit.
KeywordHuaniushan Pb-Zn-Ag deposit In situ S-Pb isotopes Trace elements Ore genesis
DOI10.18654/1000-0569/2021.06.11
WOS KeywordORE GENESIS ; U-PB ; OROGENIC BELT ; LEAD ISOTOPES ; BEISHAN ; PYRITE ; CHINA ; GOLD ; ICP ; GEOCHRONOLOGY
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000747443600011
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104036
Collection中国科学院地质与地球物理研究所
Corresponding AuthorYu XiaoFei
Affiliation1.China Geol Survey, Dev & Res Ctr, Beijing 100037, Peoples R China
2.Minist Nat Resources, Tech Guidance Ctr Mineral Resources Explorat, Beijing 100037, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Du ZeZhong,Yu XiaoFei,Sun HaiRui,et al. Genesis of the Huaniushan Pb-Zn-Ag deposit in Gansu: Constraints from in situ S, Pb isotopes and trace elements[J]. ACTA PETROLOGICA SINICA,2021,37(6):1813-1829.
APA Du ZeZhong,Yu XiaoFei,Sun HaiRui,Du YiLun,&Kang Kai.(2021).Genesis of the Huaniushan Pb-Zn-Ag deposit in Gansu: Constraints from in situ S, Pb isotopes and trace elements.ACTA PETROLOGICA SINICA,37(6),1813-1829.
MLA Du ZeZhong,et al."Genesis of the Huaniushan Pb-Zn-Ag deposit in Gansu: Constraints from in situ S, Pb isotopes and trace elements".ACTA PETROLOGICA SINICA 37.6(2021):1813-1829.
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