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Sources of Qingchengzi Pb‐Zn Orefield: Implications from Pb Isotope
Author(s) -
DUAN Xiaoxia,
ZENG Qingdong,
WANG Yongbin,
ZHOU Lingli
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12385_6
Subject(s) - beijing , chinese academy of sciences , china , library science , geology , geography , archaeology , computer science
Qingchengzi orefield, located in Liaoning province, is a large polymetallic orefield in Liaodong-Jinan metallogenic belt, NE China. This large orefield clustered several Pb-Zn, Ag, Au and Mo ore deposits with estimated reserves of 1.5Mt Pb and Zn metals, 1100t Ag and 200t Au metals. Previous studies have debates concerning sources and ore genesis of the coexisting polymetallic deposits. Controversial ore genesis models have been proposed: a magmatic hydrothermal origin (Xue et al., 2003; Yu et al., 2009), a metamorphic hydrothermal origin model (Zhang, 1984), a Proterozoic SEDEX origin (Wang et al., 1994) model and a reworking model with Proterozoic sedimentation modified by latter metamorphic and hydrothermal activities (Jiang and Wei, 1989; Li, 2005). We choose Pb isotope analysis to unlock the source of the ore-forming materials. Ore minerals and wall rocks were systematically collected for Pb isotope measurement. The ore minerals (sphalerite, galena, pyrite, argentite, etc.) were subdivided into four groups corresponding to different mineralization types: 1laminated Pb-Zn ore type, collected from conformable, stratiform ore bodies; 2the massive PbZn ore type, collected from unconformable, vein and irregular orebodies; Type1and2 belong to strata-hosted ores and 3 Pb-Zn ore occurred within intrusive bodies and 4the independent Ag ore type. Wall rocks in the orefield include igneous rocks (Triassic and Jurassic) and stratigraphic rocks (metamorphic rocks of Liaohe Group, e.g. marble and schist).