The Xiajinbao, Yu’erya and Jinchangyu gold deposits in this district are characterized by crosscutting relationships between gold veins and various dikes. The chemical name of the ion IO3- is: Problem: Give the chemical formula for (a) chlorite ion. The North China Craton (NCC) hosts numerous gold deposits clustering in several districts, which combined have proven reserves of ~7000 t Au. 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. Based on detailed petrographic observation and SWIR spectral data (Zhang et al., 2017, Chen et al., 2019), we present detailed electron probe microanalysis (EPMA) and LA–ICP–MS geochemical data for various types of chlorite from Tonglushan. 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. Through our analyses, we identify the potential characteristics of important mineral resources in different metallogenic areas (belts) to enhance the scientific decision-making process for the exploration and deployment of mineral resources in China. All Chemistry Practice Problems Polyatomic Ions Practice Problems. Accordingly, a two-stage mineralization model is proposed for the Huayangchuan polymetallic deposit with an early phase of ore veining in the Late Triassic to latest Jurassic during the nearly N-S collision between the South and North China blocks and a late phase of ore veining or more possibly reworking in the Early Cretaceous related to the Yanshanian orogeny due to a generally NW-directed subduction of the Paleo-Pacific oceanic plate beneath the eastern Asia continent. Geochronological studies have shown that the craton-wide gold mineralization occurred mostly in the 140–120 Ma interval, coincident with the peak of thinning and destruction of the lithospheric keel beneath the NCC. The composition of gold grains derived from placers was determined based on a representative collection. 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 source of gold supply for the Kharuzovka and Kamenka-Barabanovsky placers spatially related to the hypothetical continuation of the type II’ ore zones of the Novolushnikovsky deposit. Nb, Ta, Zr and Hf) and transition elements (e.g. We suggest that possible alteration of the gold composition manifested both in the rims and in the cores is represented by significant loss of Hg, while the other analyzed components underwent relative enrichment. Chlorites are also known as salts of chlorous acid. LA-ICP-MS zircon U-Pb dating of pre- and post-ore dikes from the three gold deposits yields concordant U-Pb dates of 165–163 Ma, 165–164 Ma and 165–164 Ma, respectively. Previous studies on Tonglushan were dedicated to understand its geological setting, the petrographic, geochemical and geochronological features of the mineralized quartz monzodiorite (porphyry), as well as the chemical compositions of the skarn minerals and ore-forming fluids (e.g., Shu et al., 1992, Xie et al., 2007, Xie et al., 2011, Li et al., 2009, Li et al., 2010, Zhao et al., 2010, Zhao et al., 2012, Zhang et al., 2018, Zhang et al., 2019). The Huayangchuan U-Nb-Pb polymetallic deposit is hosted in a suite of Neoarchean to Paleoproterozoic gneisses in the Xiaoqinling region, central China. chlorite) are rarely reported for skarn ore exploration (Chu et al., 2020). Compared with the whole-rock geochemical anomalies, the effective vectoring distance with chlorite geochemistry is much longer, and could reach up to 4–5 km (Wilkinson et al., 2015). The Tonglushan Cu–Au–Fe deposit (86.3 Mt @ 1.66% Cu, 0.94 g/t Au and 39.4% Fe) is one of the largest Cu–Au polymetallic skarn deposits in the Middle–Lower Yangtze River metallogenic belt (MLYRB, Eastern China). However, the corresponding sodium salt, sodium chlorite, NaClO2 is stable and inexpensive enough to be commercially available. 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). Find out how LUMITOS supports you with online marketing. The resetting event could be related to post-collision of Xing’an Block and Songliao-Xilinhot Block. The major exposed sequences are the Daye Fm. Chlorite is also a type of mineral; see chlorite group. 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. 4 and 13 were discovered in the deeper part of Tonglushan (Hu et al., 2011, Zhang et al., 2018). The ore and alterated rock have distinct Nd-Pb isotopic compositions either from the host Linglong granites or from the asthenosphere-derived mafic dikes but similar to the lithospheric mantle-derived mafic dikes. The first time reported demercurization processes occurring under the supergenic conditions determine this alteration. The deposit is composed mainly of discrete small-scale carbonatite veins emplaced largely along shallow-lying brittle fractures. Chlorites are also known as salts of chlorous acid. 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. 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 results indicate that the ore and alterated rock have much higher HREE (e.g. © 1997-2020 LUMITOS AG, All rights reserved, https://www.chemeurope.com/en/encyclopedia/Chlorite.html, Your browser is not current. The only bedrock deposit in the study area is the Novolushnikovsky gold deposit located in the Suenginsky placer field of the Egoryevsky district. The Jiaodong Peninsula is the largest gold concentration district in China and the third largest one in the world. 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. Join thousands of students and gain free access to 46 hours of Chemistry videos that follow the topics your textbook covers. 3, Fig. Major element contents of chlorite were measured with a JEOL JXA-8230 EPMA at the Key Laboratory of Mineralogy and Metallogeny, Since mineral inclusions (e.g., titanite, apatite and magnetite) and precursor mineral residues are common in chlorite, it is necessary to evaluate their potential contamination influence on the obtained EPMA and LA–ICP–MS geochemical data (Inoue et al., 2010, Xiao et al., 2018a).

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