Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

Mesozoic multi‐stage W–Sn polymetallic mineralization in the Nanling Range, South China: An example from the Dengfuxian–Xitian ore field

“…Zircon Ce anomalies can provide evidence for the oxidation state of magmas and related fluids, where higher Ce/Ce* values correspond to higher f O 2 (Kong, Xu, & Chen, ; Li et al, ). In this study, though the difference on Ce/Ce* ratios of variable zircon generations is limited, it can be generally found that the Triassic magmatic zircons have more pronounced positive Ce anomalies than the Jurassic and Cretaceous magmatic zircons (Figure c).…”

Geochronology and Genesis of the Xitian W-Sn Polymetallic Deposit in Eastern Hunan Province, South China: Evidence from Zircon U-Pb and Muscovite Ar-Ar Dating, Petrochemistry, and Wolframite Sr-Nd-Pb Isotopes

“…As the most important tungsten-bearing mineral in the tungsten deposit, geochemical compositions and mineralogical features of wolframite can provide abundant metallogenetic information, i.e., fluid, environment, and metal source [1,5,44,104]. The samples of wolframite analyzed in this study have high initial 87 Sr/ 86 Sr ratios (0.71282-0.72003), indicating that the wolframites in quartz vein type ore bodies are characterized by a crustal source. Furthermore, these samples also have negative ε Nd (t) values ranging from −15.9 to −5.6 and cover a wide range of model ages (T DM2 = 2168 − 1399 Ma).…”

“…Thus, Ce anomalies can provide information for the oxidation state of magma and/or related fluid, where higher Ce/Ce* ratios are in accordance with the high oxygen fugacity (fO2; [83][84][85]. However, zircon Eu anomalies are not the efficient tracer, because Eu anomalies in zircon are controlled not only by the redox state of the fluids but also by the crystallization history of plagioclase [86,87]. Due to the relatively low ratios of Ce/Ce* for the zircons from sample 19-4s1 and 24-15s1, almost all the zircon grains plot in the field of low fO2 indicating that these formed in a lower fO2 environment (Figure 11a).…”

“…It indicates that the origin of skarn has a genetic relationship with Indosinian granites rather than Yanshanian granites. The Indosinian granitoids of the Xitian pluton are high-Si, high-K, weakly to strongly peraluminous, and highly fractionated S-type granites with high initial 87 Sr/ 86 Sr isotope ratios (0.71397-0.71910), low ε Nd (t) values ranging from −10.1 to −9.4, and old Nd model ages (1858-1764 Ma), indicating that the Xitian Indosinian granites were mainly originated from partial melting of Paleoproterozoic metamorphic basement with small amounts of mantle-derived magma involved [38]. Since the Indosinian granites are closely related to the skarn type W-Sn mineralization, it can be inferred that the source of ore-forming metals from skarn type ore bodies should be mainly originated from a crustal source.…”

“…The initial 87 Sr/ 86 Sr and 143 Nd/ 144 Nd ratios were calculated using the muscovite 40 Ar- 39 The Pb isotopic compositions of the samples are shown in 40 Ar- 39 Ar dating result of 150.0 ± 0.6 Ma using single-stage Pb isotopic evolution model [77], with values of ∆β ranging from 26.09 to 36.06, ∆γ values from 48.95 to 58.62, and µ values from 9.81 to 9.99, respectively.…”