Early Permian lode gold mineralization in the northern North China Craton:Constraints from S-Pb isotope geochemistry and pyrite Re-Os geochronology of the Chaihulanzi deposit
| Autor: | Keyong Wang, Xueli Ma, Wen-yuan Wang, Kaituo Shi, Rui Wang, Thomas Ulrich |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Isochron
geography Mineralization (geology) geography.geographical_feature_category 010504 meteorology & atmospheric sciences Phyllic alteration S–Pb isotopes Chaihulanzi deposit Geochemistry Geology engineering.material 010502 geochemistry & geophysics 01 natural sciences Orogenic gold deposit Craton Isotope geochemistry Geochronology engineering Re–Os geochronology Pyrite Pyrrhotite 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Shi, K, Wang, K, Ulrich, T, Ma, X, Wang, W & Wang, R 2021, ' Early Permian lode gold mineralization in the northern North China Craton : Constraints from S-Pb isotope geochemistry and pyrite Re-Os geochronology of the Chaihulanzi deposit ', Journal of Asian Earth Sciences, vol. 218, 104867 . https://doi.org/10.1016/j.jseaes.2021.104867 |
| Popis: | The Chaihulanzi gold deposit is located in the Chifeng-Chaoyang region in the northern margin of the North China Craton. It contains auriferous quartz veins and disseminated mineralization in hydrothermal alteration zones, controlled by NW-striking faults in mica schist of the Neoarchean-Paleoproterozoic Dayingzi Formation. Pyrite and pyrrhotite are the predominant ore minerals. Gold mineralization is closely associated with pyritic and phyllic alteration. The ore-forming process can be divided into four stages involving stage I quartz-pyrite; stage II quartz-pyrite-pyrrhotite-chalcopyrite; stage III quartz-polymetallic sulfides; and stage IV quartz-calcite. Gold generally occurs in fissures or as inclusions within stage II pyrite and quartz. Stage II pyrite yields a well-defined 187Re/188Os versus 187Os/188Os isochron age of 291.8 ± 3.4 Ma (MSWD = 2.1). This is the first record of Early Permian gold mineralization in the Chifeng-Chaoyang district. Sulfur and lead isotope data of stage II pyrite and pyrrhotite show that ore metals are principally derived from metasomatized lithospheric mantle, with few involvements of crustal materials. On the basis of available evidence, we suggest that the Chaihulanzi deposit is an atypical subduction-related orogenic gold deposit. These new findings might have important implications for future gold exploration in the area. |
| Databáze: | OpenAIRE |
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