Dating Ore Deposit Using Garnet U–Pb Geochronology: Example from the Xinqiao Cu–S–Fe–Au Deposit, Eastern China

Abstract

Abstract:The large Xinqiao Cu-S-Fe-Au deposit in the Tongling ore district, Eastern China, is characterized by a large-scale stratiform orebody, in which garnet is widely distributed as the main gangue mineral associated with mineralization. Xinqiao garnet can be divided into early (Grt1) and late (Grt2) generations based on extensive back-scattered electron (BSE) imaging observations. Laser ablation (LA)-ICP-MS trace element and U-Pb isotope composition analyses indicate that uranium occurs homogeneously within the Xinqiao garnet, and Grt1 and Grt2 have weighted average 207 Pb-corrected 206 Pb/ 238 U ages of 137.0 ± 7.8 Ma (Mean standard weighted deviation (MSWD) = 4.9) and 129.6 ± 7.1 Ma (MSWD = 1.6), respectively, similar to the zircon U-Pb age (139.6 ± 1.5 Ma) of the Jitou intrusion. These garnet U-Pb ages, combined with the low MnO content and various Y/Ho ratios, suggest that the Xinqiao garnet is likely to have a magmatic hydrothermal replacement origin associated with the Jitou stock. Based on previous studies of the Xinqiao deposit, we infer that the Xinqiao stratiform orebody may have formed from the Early Cretaceous magmatic hydrothermal fluids associated with the Jitou stock, and may have been generated by the Early Cretaceous tectono-thermal event in Eastern China.

New Facile One-Pot Synthesis of Isobutyl Thiocarbamate in Recycling Solvent Mixture

“…Various studies highlighted the importance of surface oxidation of sulfide minerals with respect to xanthate adsorption and their response to flotation [15,16].…”

New Eco-Friendly Xanthate-Based Flotation Agents

“…The limited resources of today's mining industry increase the need for the development of more efficient collectors, while also reducing environmental risks [1][2][3][4][5][6][7]. Since the beginning of the 20th century, xanthates (O-alkyl dithiocarbonates) have been widely used as reagents for the flotation concentration of a variety of sulfide and oxide minerals because of their capability to attach to hydrophobic agents [8][9][10]. Metal-xanthate complexes and their adducts with a variety of Lewis bases have been extensively studied [11] and soluble alkali xanthates widely used in the extraction and purification of Hg, Ag, Cd, etc.…”

“…Xanthates are most commonly obtained by the reaction of alcohol, hydroxide, and carbon disulfide, or by the reaction of alkoxide, which is obtained by the reaction of alcohol and hydroxide, alcohol and alkali metal, ether and hydroxide with carbon disulfide [10]. There are numerous technological procedures for the synthesis of alkaline alkyl xanthates, many of which are applied at the industrial level and protected by patent applications [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

U‐Pb Geochronology and Geochemistry of Stratiform Garnet from the Aqishan Pb‐Zn Deposit, Eastern Tianshan, Xinjiang, NW China: Constraints on Genesis of the Deposit

“…), which led to the method not being widely used until recent years (Dewolf et al, 1996). Due to the discovery of the high content of U in the lattice of the grossular-andradite garnet, this technique has been widely used in metallogenic dating and has achieved good results (Deng et al, 2017;Seman et al, 2017;Gevedon et al, 2018;Wafforn et al, 2018;Zhang et al, 2018).…”