文献类型：期刊文献

英文题名：Sulfide trace element enrichments in the metamorphic basement-hosted Xinhua Pb-Zn-Cu vein-type deposit, eastern Guizhou province (SW China)

作者：Xiang, Zhenzhong Ye, Lin Wei, Chen Wu, Tao Liu, Shiyu Hu, Yusi Huang, Zhilong Liu, Sichen Zheng, Minghong Du, Lin

第一作者：Xiang, Zhenzhong

通信作者：Ye, L[1];Wu, T[2]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China;[2]Guizhou Univ Engn Sci, Coll Min Engn, Bijie 551700, Peoples R China;[3]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[4]Helmholtz Inst Freiberg Resource Technol, Helmholtz Zentrum Dresden Rossendorf, Chemnitzer Str 40, D-09599 Freiberg, Germany;[5]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550003, Peoples R China;[6]Guizhou Nonferrous Met & Nucl Ind Geol Explorat Bu, Guiyang 55000, Guizhou, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China;corresponding author), Guizhou Univ Engn Sci, Coll Min Engn, Bijie 551700, Peoples R China.

年份：2024

卷号：174

外文期刊名：ORE GEOLOGY REVIEWS

收录：;EI(收录号：20244317245605);Scopus(收录号：2-s2.0-85206840035);WOS:【SCI-EXPANDED(收录号:WOS:001342734700001)】；

基金：This study was supported by the National Natural Science Foundation of China (42173025, 92162218) , the strategic pilot special project A of the Chinese Academy of Sciences (XDA0430103) , the Great Science and Technology Engineering Projects of Guizhou Provincial Science and Technology Department (QKHZLZK: [2022] ZD002) , and the Guizhou Provincial Natural Science Foundation (ZK [2023] 477) . We gratefully thank Ms. Shaohua Dong, Ms. Wenqin Zheng, Mr. Xiang Li, Dr. Zhihui Dai and Ms. Dan Chen at the State Key Laboratory of Ore Deposit Geology for their assistance in analysis and sample preparation.

语种：英文

外文关键词：MVT; Quartz vein-type Pb-Zn deposit; Xinhua deposit; Trace elements of sphalerite and chalcopyrite

摘要：Cambrian carbonate formations are widespread in the western Hunan-eastern Guizhou region (southwestern China), which hosts many Mississippi Valley-Type (MVT) lead-zinc (Pb-Zn) deposits. Regional Pb-Zn mineralization is well developed in the low-grade metamorphic rocks of the basal Proterozoic Banxi Group. The mineralization is associated with quartz veins and generally distributed along NE-trending fault zones. Moreover, these deposits have an extensive distribution and high grade, and are associated with Cu-Ag endowment. However, geological and geochemical research on these Pb-Zn vein-type deposits is relatively limited, and their relationship with the regional MVT mineralization remains unclear. The representative Xinhua deposit in Danzhai district is selected as the study subject. We conducted in situ trace element analyses on the sphalerite and chalcopyrite from the various metallogenic stages, and compared them with published sphalerite trace element data from the MVT Pb-Zn deposits in the western Hunan-eastern Guizhou metallogenic belt. Seven orebodies in Xinhua Pb-Zn deposit have been discovered so far, with a metal resource of over 120,000 metric tonnes of Zn + Pb. Field geology and microscopic petrography have revealed two mineralization stages: An earlystage black sphalerite (Sp-I) followed by reddish-brown sphalerite (Sp-II) mineralization, which corresponds to the main chalcopyrite mineralization stage, and a later-stage light-yellow sphalerite (Sp-III), Cu ore-barren mineralization. LA-ICPMS data indicate that the sphalerite from Xinhua has similar trace element compositions to those from the MVT Pb-Zn deposits in the region. They are relatively enriched in Ga, Cd, and Ge, while depleted in Fe, Co, and Mn. Critical metal Ge and Ga are particularly enriched in sphalerite, especially in Sp-I (Ge max 937 ppm, Ga max 824 ppm). The substitution mechanism of Ge and Ga in sphalerite are likely 2Cu+ + Ge4+ <-> 3Zn2+ and Cu+ + Ga3+ <-> 2Zn2+. Indium and Sn are mainly present in Sp-I and Sp-III. Chalcopyrite contains Zn and Sn both exceeding 100 ppm. Contents of Se, Ag, In, and Sn in chalcopyrite are significantly higher than those in sphalerite. Calculation of the sphalerite trace element geothermometer (GGIMFis) suggests that the average sphalerite ore-forming temperatures are 164 degrees C (Sp-I), 156 degrees C (Sp-II), and 205 degrees C (Sp-III), implying medium- to low-temperature mineralization. This indicates a possible influx of high-temperature, in-bearing fluid during the late-stage mineralization. In summary, the faults-controlled vein-type Pb-Zn deposits (e.g., Xinhua) may have been products of the same Kwangsian orogeny as other strata bound MVT deposits, and the Xinhua deposit features two mineralization stages with multiple ore metal sources. During the ore-forming fluid ascent, some ore-forming materials may have precipitated in the fluid conduits. And exposed after the erosion of the shallower stratiform orebodies and strata. Consequently, the Xinhua Pb-Zn deposit represents the preserved ore-fluid conduit phase (in the basement strata) of the MVT mineralization.