Plumbotectonics—the model

Isotope systematics of ore-bearing granites and host rocks of the Orlovka-Spokoinoe mining district, eastern Transbaikalia, Russia

“…Pb isotope systematics shows the presence of a mantle source in the formation of the studied granites ( Figure 3). A mantle-derived component is in a transitional field between mid-ocean ridge basalt (MORB) and type II enriched mantle (EM II) (Zartman and Doe, 1981) but closer to the latter. There is a mixture of different time episodes presented on Figure 3.…”

Geology, geochronology and isotopic geochemistry of the Xiaoliugou W–Mo ore field in the Qilian Orogen, NW China: Case study of a skarn system formed during continental collision

“…This indicates the fluids that formed the pyrite were from a mixed source (Zartman and Doe, 1981). In contrast, the Pb-isotopic composition of molybdenite shows higher 206 Pb, U/Pb and Th/Pb, which coincide with the characteristics of high U and Th of the upper crust, indicating the fluids that formed the molybdenite originated from upper crustal sources (Zartman and Doe, 1981). Further comparison between the pyrite, molybdenite, granite and host rocks implies that the Pb composition of molybdenite is similar to the granite, and the Pb composition of pyrite is similar to the host rocks.…”

“…The Pb-isotopic composition of pyrite is plotted between the upper crust and mantle fields and shows a steeply dipping distribution. This indicates the fluids that formed the pyrite were from a mixed source (Zartman and Doe, 1981). In contrast, the Pb-isotopic composition of molybdenite shows higher 206 Pb, U/Pb and Th/Pb, which coincide with the characteristics of high U and Th of the upper crust, indicating the fluids that formed the molybdenite originated from upper crustal sources (Zartman and Doe, 1981).…”

“…Lead isotope compositions of pyrite, molybdenite, granite and host rocks are plotted in the diagram of Zartman and Doe(1981) (Fig. 7).…”

Pb Isotope Signatures of Polymetallic (Au-Cu-Zn) Deposits of the SW Amazonian Craton and Their Relation to Crustal Evolution

“…Among geochronologic methods, Pb isotope geochemistry is a powerful tool in helping to solve problems of metallogenesis, because they provide informations about the origin of the fluids responsible for the metal concentration (Changkakoti et al, 1986;Crocetti et al, 1988;Deloule et al, 1989;Kerrich, 1989;Kerrich, 1991;Wilton, 1991). As the isotopic ratios yielded a time-integred record of the U/Pb and Th/Pb ratios of the sources in which the lead developed, they also shed light upon the time-dependent geochemical behavior of these elements within the lithosphere (Cumming and Richards, 1975;Doe and Zartman, 1979;Zartman and Doe, 1981;Zartman and Haines, 1988). This work, based mainly on Pb isotopes constitutes a preliminary attempt to correlate the Proterozoic crustal evolution with metalogenetic processes in the southwestern Amazonian craton.…”