The link between Paleo-Tethys subduction and regional metallogeny in the SW Yangtze Block: New evidence from the Zubu carbonate-hosted F-Pb-Zn deposit.
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| Title: | The link between Paleo-Tethys subduction and regional metallogeny in the SW Yangtze Block: New evidence from the Zubu carbonate-hosted F-Pb-Zn deposit. |
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| Authors: | Yu, Li-Ming1 (AUTHOR), Zou, Hao1,2 (AUTHOR) zouhao21@gmail.com, Santosh, M.3,4 (AUTHOR), Xiao, Bin1 (AUTHOR), Li, Min1 (AUTHOR), Peng, Hui-Juan2 (AUTHOR), Li, Dian2 (AUTHOR), Hu, Cheng-Hui1 (AUTHOR), Huang, Chang-Cheng1 (AUTHOR), Chen, Hai-Feng1 (AUTHOR) |
| Source: | Ore Geology Reviews. May2022, Vol. 144, pN.PAG-N.PAG. 1p. |
| Subjects: | Fluid inclusions, Geological time scales, Metallogeny, Carbonate rocks, Subduction, Ore deposits |
| Geographic Terms: | China |
| Abstract: | [Display omitted] • Fluorite from Zubu F-Pb-Zn deposit yields an Sm-Nd isochron age of 211 ± 11 Ma. • Ore-forming fluid were derived from the metamorphic water, brine and meteoric water. • Ore-forming materials were derived from the basement and sedimentary strata. • The Pb-Zn mineralization is related to the closure of the Paleo-Tethys Ocean. The lead–zinc mineralization belt along the southwestern margin of the Yangtze Block is one of the important source for lead, zinc, germanium and silver in China. More than 50% of the deposits in the region occur in carbonate rocks ranging in age from late Ediacaran to early Cambrian. Here we investigate the large Zubu F-Pb-Zn deposit located in the southwestern margin of the Yangtze Block. The ore bodies strike nearly NS in the dolomite fracture zone in the second member of the Cambrian Longwangmiao Formation and discontinuously extend for 0.7 km long. We present Sm-Nd isotopic data on the fluorite ore that yield an isochron age of 211 ± 11 Ma. Fluid inclusions in the fluorite show homogenization temperature between 88 and 247 °C with a peak at 130–180 °C, with salinity ranging between 0.18 and 22.23 wt% NaCl eqv. (average of 9.24 wt% NaCl eqv.), the ore-forming fluid has the characteristics of medium–low temperature and medium–low salinity. The rare earth element (REE) signature of fluorite display positive Eu anomaly and negligible negative to weak positive Ce anomaly. The δ18O V-SMOW values range from 0.6 − 4.7 ‰, δD V-SMOW values range from −41.1–27.6 ‰, fluorite Sr isotopic values range from 0.710668 to 0.711585, and galena Pb isotope ratios with the value of 206Pb/204Pb = 18.551–18.564, 207Pb/204Pb = 15.676–15.693, 208Pb/204Pb = 38.869–38.809. The field, petrologic, geochemical and isotopic data from our study lead to the following salient findings. (1) The ore-forming fluid of the F-Pb-Zn deposit was derived from the mixture of metamorphic water flowing through the basement with basin hot brine and meteoric water. (2) The ore-forming material of the deposit comes from the basement and sedimentary strata. (3) In conjunction with the geochronological data of regional ore deposits, the large-scale mineralization is inferred to have formed during a transitional stage from compression to extension setting related to the Indosinian orogeny after the closure of the late Triassic-early Jurassic (220–190 Ma) Paleo-Tethys Ocean. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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