The Huayangchuan U-Nb-Pb polymetallic deposit is hosted in a suite of Neoarchean to Paleoproterozoic gneisses in the Xiaoqinling region, central China. Their Sr isotopic compositions show a mix trend between the lithospheric mantle-derived mafic dikes and Neoarchaean basement. Chlorites are also known as salts of chlorous acid. The temporal consistency and abundant sulfide inclusions hosted in the mafic-intermediate intrusions, along with the close spatial relations between gold veins and various dikes within and surrounding the mines, indicate a possible magmatic source for ore fluids. The Middle–Lower Yangtze River metallogenic belt (MLYRB) is located in the northeastern Yangtze Craton, and borders with the North China Craton and Qinling–Dabie Orogen in the north. The first time reported demercurization processes occurring under the supergenic conditions determine this alteration. The chlorine dioxide is then absorbed into an alkaline solution and reduced with hydrogen peroxide, H2O2 yielding sodium chlorite. 1; Mao et al., 2011, Zhou, The large Tonglushan Cu–Au–Fe skarn deposit lies in the southern–central part of the Daye ore district, and has a proven ore reserve of 86.3 million tonnes (Mt) @ 1.66% Cu, 0.94 g/t Au and 39.4% Fe, plus certain Co, Ag and Mo endowments (Fig. By registering, I agree to the Terms of Service and Privacy Policy, Concept: Understanding the Polyatomic Ions, Concept: The 4 Characteristics of Polyatomic Ions with Halogens, Concept: Naming System for Polyatomic Ions with Halogens, Give the chemical formula for (a) chlorite ion. The substitution mechanisms of Fe2+ ⇔ Mg2+, Tschermark (AlivAlvi ⇔ Si (Mg2+, Fe2+)) and di-trioctahedral (3(Mg2+, Fe2+) ⇔ □ + 2Alvi) are likely important for the Tonglushan chlorite formation. FREE Expert Solution Show answer. The only bedrock deposit in the study area is the Novolushnikovsky gold deposit located in the Suenginsky placer field of the Egoryevsky district. 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. Therefore, in order to satisfy this demand, China has furthered its evaluation of mineral resources potential to help guide future mineral explorations. 3; Li et al., 2010, Xie et al., 2011, Zhang et al., 2019). Q. These ages are clearly younger than the mineralization age of Zhengguang (~480 Ma) and therefore represent a post-ore event which reset the adularia and illite argon systems. An advantage in this application, as compared to the more commonly used chlorine, is that trihalomethanes are not produced from organic contaminants. c) iodate Based on the innovation of geological theory, prediction and prospecting models, as well as GIS-based comprehensive assessment methods, 25 important mineral resources and key metals have been assessed in China. With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter. At Batu Hijau (Indonesia), for instance, some workers found that Mg-rich chlorite with shorter wavelength of Pos2250 occurs closer to the mineralization center (Neal et al., 2018), and that higher contents of Ti, V, Fe, Zn and ratios of Mg/Sr, Mg/Ca, Ti/Sr, Ti/Pb and V/Ni can effectively vector toward the mineralization center (Wilkinson et al., 2015). Due to the wide range of non-stoichiometric compositional variations, chlorite can be used to trace the mineral-forming physicochemical conditions, such as temperature, oxygen fugacity and sulfur fugacity (Walshe, 1986, Bryndzia and Scott, 1987, Cathelineau, 1988, Zang and Fyfe, 1995, Inoue et al., 2010, Bourdelle et al., 2013). The major exposed sequences are the Daye Fm. Based on our previous SWIR spectral and petrographic data (Zhang et al., 2017, Zhang et al., 2020, Chen et al., 2019), 80 chlorite-bearing samples were selected, from which 620 polished thin-sections were prepared for the EPMA and LA–ICP–MS elemental analyses. The presence of placer gold grains with mineral inclusions, that partially or fully correspond to mineral association of ores of the Novolushnikovsky deposit, as well as an unusual Hg-content of the native gold suggest several sources of gold with a similar mineralization style. © 2020 Elsevier B.V. All rights reserved. The actual substitution mechanism would depend on the P–T conditions, whole-rock chemical compositions and other physicochemical conditions of the hydrothermal environment (e.g., Inoue et al., 2009, Based on petrographic observation, the chlorite in the Tonglushan Cu–Au–Fe skarn deposit can be divided into three types: (i) disseminated-type that replaced biotite and/or hornblende in the quartz monzodiorite (porphyry), (ii) vein-type in quartz–chlorite–sulfides veins along/near the internal and external intrusive contact, and (iii) replacement-type that replaced skarn minerals or Fe oxides in the skarn mineralization center. Find out more about the company LUMITOS and our team. A) nitrogen dioxide ion. Such compositional differences may have mainly attributed to the protolith (or precursor minerals) and hydrothermal fluid chemistry. Password must contain at least one uppercase letter, a number and a special character. 3; Zhao et al., 2012). These indistinguishable U-Pb dates within analytical uncertainty are interpreted as the timing of gold deposition (165–163 Ma) and thus reveal a previously unrecognized Late Jurassic gold mineralization event in the Jidong district. C) nitrite ion. with chlorine in oxidation state +3. Chlorite is also a type of mineral; see chlorite group. However, the corresponding sodium salt, sodium chlorite, NaClO2 is stable and inexpensive enough to be commercially available. One wonders where all this gold comes from. The composition of gold grains derived from placers was determined based on a representative collection. For skarn-type deposits, Han et al. Chlorites are also known as salts of chlorous acid. Numerous studies have shown that chlorite has a wide compositional range, and proposed three ion substitutions mechanisms for chlorite, i.e., (1) Fe2+ ⇔ Mg2+, (2) Tschermak AlivAlvi ⇔ Si (Mg2+, Fe2+), and (3) di-trioctahedral 3(Mg2+, Fe2+) ⇔ □ + 2Alvi (Inoue et al., 2009, and ref. This sequence of thermal disturbances unlikely predates the D4 deformation given that it is the last ductile deformation experienced by the Precambrian rocks. We would like to thank Ketao Wei, Shanggang Jin, Wan Huang and Kai Du (Team. B) nitrogen(II) oxide ion. Ore Geology Reviews, Volume 126, 2020, Article 103781, Ore Geology Reviews, 2020, Article 103816, Ore Geology Reviews, Volume 127, 2020, Article 103755, Ore Geology Reviews, Volume 127, 2020, Article 103824, Ore Geology Reviews, Volume 126, 2020, Article 103798, Ore Geology Reviews, Volume 126, 2020, Article 103791, Chlorite as an exploration indicator for concealed skarn mineralization: Perspective from the Tonglushan Cu–Au–Fe skarn deposit, Eastern China, National Natural Science Foundation of China, Native gold from the Kamenka-Barabanovsky and Kharuzovka alluvial placers (Northwest Salair Ridge, Western Siberia, Russia): Typomorphic features and possible bedrock sources, Study on the major minerals potential in China, Multiple episodes of tectono-thermal disturbances in the Huayangchuan U-Nb-Pb polymetallic deposit in the Xiaoqinling region, central China and their significances on metallogeny, Elemental and multiple isotopic evidences of enriched lithospheric mantle origin of the Xiadian gold deposit in the Jiaodong Peninsula, East China, Zircon U-Pb dating reveals Late Jurassic gold mineralization in the Jidong district of the northern North China Craton, Thermal history of an Early Paleozoic epithermal deposit: Constraints from. What scientific concept do you need to know in order to solve this problem? First, the explosively unstable gas chlorine dioxide, ClO2 is produced by reducing sodium chlorate in a strong acid solution with a suitable reducing agent (for example, sodium chloride, sulfur dioxide, or hydrochloric acid). We found that the exploration and deployment of bulk minerals such as iron, manganese, and copper are continuously changing. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Sodium chlorite is derived indirectly from sodium chlorate, NaClO3. The North China Craton (NCC) hosts numerous gold deposits clustering in several districts, which combined have proven reserves of ~7000 t Au. This method has been widely applied to porphyry Cu (–Au) systems, but related research on skarn systems remain scarce. Learn this topic by watching Polyatomic Ions Concept Videos. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE. Considering the complex collisional and amalgamation history in this area, we believe that there is exploration potential for ancient porphyry and epithermal deposits within the eastern section of the CAOB. Ore-bearing carbonatite veins have their shallowly lying attitudes consilient with the D4 and D5 deformation and ages compatible with the first two thermal overprints.
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