FREE Expert Solution Show answer. Multiple thermal events are superimposed on gneisses as revealed by 40Ar/39Ar dating on biotite collected from various lithologies in the deposit and its adjacent areas, which yields ages ranging from Late Triassic (238–203 Ma), through earliest Cretaceous (139–134 Ma) and middle Cretaceous (117–92 Ma), to latest Cretaceous (72 Ma) and even early Cenozoic (53 Ma). Meanwhile, controlled by both protolith composition and temperature differences, the Fe-rich chlorite with longer wavelength of Pos2250 shows an opposite trend to the ore-forming porphyry at Tuwu, NW China (Yang et al., 2005). You can also practice Chemistry: The Central Science - Brown 11th Edition practice problems. The first time reported demercurization processes occurring under the supergenic conditions determine this alteration. Three types of chlorite have been identified, i.e., disseminated chlorite replacing biotite and/or hornblende in the ore-causative quartz monzodiorite (porphyry), vein-type chlorite in quartz–chlorite–sulfides veins along/near the internal and external intrusive contact, and replacement-type chlorite that replaced garnet, diopside, epidote and Fe oxides in the skarn mineralization center. It covers no >0.2% of China's total landmass yet accounts for 30% of the total national gold reserves with total proved resources near 5000 t Au. Compositional variations of chlorite have been increasingly used to trace the magmatic–hydrothermal fluid evolution, as well as exploration vector toward concealed orebodies. The only bedrock deposit in the study area is the Novolushnikovsky gold deposit located in the Suenginsky placer field of the Egoryevsky district. For porphyry Cu (–Au) system, since the progressive decrease in alteration intensively and temperatures away from the ore-causative intrusion would commonly generate zoning of alteration minerals, including chlorite, epidote, white mica and pyrite (Sillitoe, 2010, Cooke et al., 2014). Learn this topic by watching Polyatomic Ions Concept Videos. The composition of gold grains from studied placers shows that the average Hg content is 1.5–5 wt%. Chlorite minerals have a generalized chemical composition of (X,Y) 4-6 (Si,Al) 4 O 10 (OH,O) 8.The "X" and "Y" in the formula represent ions, which might include: Fe +2, Fe +3, Mg +2, Mn +2, Ni +2, Zn +2, Al +3, Li +1, or Ti +4.The composition and physical properties of chlorites vary as these ions substitute for one another in solid solution. The chemical name of the ion IO3- is: Nevertheless, the genetic relations between the chemical compositions and SWIR spectra of these phyllosilicate minerals are still poorly constrained, which is the focus of this study. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Integrating the chlorite petrographic features and chemical compositions, we suggest that elevated FeOT and B contents and Fe/(Fe + Mg) ratios, and lower MgO, Al2O3, Ti, V and Sc contents can serve as proximal indicator for exploring concealed skarn orebodies at Tonglushan, as well as other similar Cu–Au–Fe skarn deposits in the MLYRB. The intra-sample variations of (U–Th)/He ages for zircon grains are mainly due to radiation damage, while those for apatite are unknown. 97% (344 ratings) Problem Details. The main application of sodium chlorite is the generation of chlorine dioxide for bleaching and stripping of textiles, pulp, and paper. The undiscovered sources of gold are might be also of intrusion related type. Based on our data, we think this problem is relevant for Professor Crisman's class at UNR. Chlorine dioxide is a chemical compound with the formula ClO 2 and the chlorite ion, or chlorine dioxide anion, is ClO 2 −. (2018) found that the Fe-rich chlorite with higher Pos2250 values (>2251 nm) could vector toward the Cu–Mo mineralization centers at Tongshankou skarn–porphyry deposit, Middle–Lower Yangtze River metallogenic belt (MLYRB) in Eastern China. Chlorite is also a type of mineral; see chlorite group.

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