Identification of Two Types of Metallogenic Fluids in the Ultra-Large Huize Pb–Zn Deposit, SW China

This work investigates the ultra-large Huize Pb–Zn deposit, based on the results of preceding studies and detailed field geological surveys. The existing findings were reorganized and reinterpreted and supplemented with C–H–O isotopic measurements, which resulted in the identification of two differe...

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Bibliographic Details
Published in:Geofluids 2017-01, Vol.2017 (2017), p.1-22
Main Authors: Wang, Lei, Wei, Pingtang, Han, Runsheng, Zhang, Yan
Format: Article
Language:English
Subjects:
Atmospheric precipitations
Brines
Carbonates
Decompression
Fluids
Geochemistry
Geological surveys
Geology
Heavy metals
High temperature
Identification
Isotope composition
Isotopes
Lead
Low temperature
Metallogenesis
Migration
Mineralization
Minerals
Ores
Precipitation
Precipitation (Meteorology)
Quartz
Rainfall
Saline water
Salinity
Salinity effects
Strata
Stratigraphy
Sulfides
Sulfur
Surveys
Zinc
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Summary:This work investigates the ultra-large Huize Pb–Zn deposit, based on the results of preceding studies and detailed field geological surveys. The existing findings were reorganized and reinterpreted and supplemented with C–H–O isotopic measurements, which resulted in the identification of two different metallogenic fluids: a high temperature, low salinity, and acidic Fluid A, which originates from deep-seated fluids and is enriched in lighter C and O isotopes (−3‰ < δ13C‰ < −4‰; 10‰ < δ18O‰ < 17‰; −92‰ < δD‰ < −50‰), and a low temperature, high salinity Fluid B, which is a subsurface brine formed by atmospheric precipitation. Fluid B is characterized by heavier C–O–H isotopic compositions (−2‰ < δ13C‰ < 1‰; 2‰ < δ18O‰ < 24‰; −66‰ < δD‰ < −43‰) than Fluid A and cycles continuously within the strata. We hypothesize that the Huize Pb–Zn deposit is the result of large-scale fluid migration from deep regions of the crust. These upward-moving fluids extracted metallic elements from carbonate strata of various ages, forming a metal-rich metallogenic fluid (Fluid A). After higher-grade ores were precipitated from the fluid following decompression boiling, it then mixed with Fluid B and continued to precipitate sulfides.
ISSN:1468-8115
1468-8123
DOI:10.1155/2017/6345810