喬夏哈拉式鐵銅金礦成礦模式及其找礦意義(存儲版)
【正文】 +‰~+‰ at the average of +‰, indicating sulfur in pyrite and chalcopyrite sourced from the mantle (Li Taide, 2002). On lead isotopes, 206Pb/204Pb of pyrite was ~, 207Pb/204Pb was ~, 208Pb/204Pb was ~, and the value of m was ~, indicating the feature of normal lead (Wan Bo et al., 2006). Meanwhile on isotopes, d18OH2O of magnetite was +‰~+‰, +‰ at average, in the range of original magmatic water. dD of gasliquid inclusions in magnetite was ‰~‰ relating to meteoric water. It suggested hydrogenoxygen in magnetite sourced from volcanic gas erruption, but contaminated by meteoric water in the deposition process (Li Taide, 2002), and also indicated the minerogenetic fluid derived from magmatic water and meteoric water (Peng Shenglin et al., 1996). Prospecting model Prospecting model of mineral deposit type can consider from the following aspects: geological condition, history criteria for prospecting, geophysical criteria, geochemical criteria, remote sensing information criteria and surface criteria for prospecting.(1) Geological condition: ①tectonic setting: the Qiaoxiahala FeCuAu deposit located in the Ertix mixing belt。 ②in the mining area: taking orebody in the eastern mining sector as an example, it was similar to the marine volcanism anomaly such as Co, Ni, and Cr occurring beneath the orebody, meanwhile it also showed the similarity to hydrothermal mineralization with wide anomaly area, clear anomaly zoning and As and Sb anomaly beneath the orebody.(5) Remote sensing information criteria: until now, there is no remote sensing information about the Qiaoxiahala area.(6) Surface criteria for prospecting: there occurred magnetite outcrops in the eastern and western mining sectors in Qiaoxiahala.3 Prospecting significanceBased on the Palaeozoic minerogenetic region classification, the Qiaoxiahala FeCuAu deposit in Xinjiang located in the PaleoAsian minerogenetic domain→Junggar minerogenetic province→Ni, Cu, Fe, Mo, Au, bentonite, coal minerogenetic belt of North Junggar (Tang Zhongli et al., 2005). In the present minerogenetic system of mineral deposits, there is no precise position for the Qiaoxiahala FeCuAu deposit, but according to its now geological features and pared to the Suoerkuduke CuMo deposi, it can be put in the Late Palaeozoic tectonicmagmatism related Fe, Cu and Ni minerogenetic series and further the Variscan early subvolcanicvolcanic formation related Fe, Cu and Au minerogenetic subseries.In the Palaeozoic large scale mineralizion process, the Qiaoxiahala FeCuAu deposit closely correlated to the marine volcanicmagmatism or seafloor volcanicexhalation sedimentary mineralization. It’s potential to prospect Qiaoxiahalatype FeCuAu deposits in the basic volcanic rock series in the arc belt of the Variscan tectonic active zone. The Laoshankou magnetite deposit locating in the southeast of Qiaoxiahala, has similar geological features to Qiaoxiahala, indicating its Cu potential in the deep. It suggests the further potential of prospecting for Qiaoxiahalatype FeCuAu deposits to its southeast in the northern margin of Junggar.7 / 7
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