Abstract
Nel Distretto di Dayu, in cui operano tre miniere principale e sei centri estrattivi minori, viene prodotto poco meno di un quarto (2300 ton/anno) del l'intera produzione in tungsteno della RPC. Oltre al W vengono prodotte apprezzabili quantità di una ventina di altri elementi, fra i quali: Sn, Mo, Bi, Nb, Ta, Terre Rare, Cu, Pb, Zn, Ag, Be, Li, etc.. I corpi minerari sono costituiti, sia da alcune centinaia di “vene a quarzo-wolframite”, che con una potenza media di 40 cm, tagliano le parti marginali di una intrusione di granito biotitico del Giura, sia da mineralizzazioni tipo stockworks che si espandono nelle metamorfiti (filladi, arenarie quarzose parzialmente cornubianitiche) cambriane poste a tetto della cupola granitica. Il granito biotitico, all' intorno delle vene, presenta zone simmetriche di alterazione, a K-feldspato e greisen; nei metasedimenti i principali minerali di alterazione sono: tormalina, muscovite, quarzo, pirofillite e topazio. Le principali caratteristiche mineralogiche e paragenetiche dei corpi minerari possono essere come di seguito schematizzate: I stadio — a prevalenti ossidi (wolframite, cassiterite, molibdenite, quarzo, K-feldspato, berillo, fluorite, topazio), il meglio rappresentato; II stadio — a prevalenti solfuri (calcopirite, galena, sfalerite, pirite, pirrotina, bismutinite, cassiterite, wolframite, quarzo), particolarmente ben rappresentato nella miniera di Piaotang; III stadio — a prevalenti carbonati (pirite, scheelite, clorite, sericite, fluorite, quarzo, calcite). La metallogenesi di Dayu, sviluppatasi in un sistema tettonicamente attivo é geneticamente associabile alle fasi tardive del magmatismo Yenshanide giurassico.
Abstract
The city of Dayu is the center of the most important tungsten district of PRC. Valuable quantities of Sn, Mo, Bi, Nb, Ta, REE, Cu, Pb, Zn, Ag, Be and Li are also recovered. At the Xihuashan and Dangping mines, hundreds of the typical Jiangxi “wolframite-quarz veins”, located at the top and marginal parts of a Jurassic biotite granite intrusion, are mined. At Piaotang the mined ore bodies consist of a stockwork-type of mineralization which cuts the roof-rocks (Cambrian metasediments: phyllite, quartz sandstone, hornfels) of the biotite granite. Around the mineralizations, the country rocks display extensive alteration: namely K-feldspar alteration and greisenization in granite; tourmalinization, muscovitization, silicification, pyrophillitization in the metasediments. The main mineralogy and parageneses of the veins and veinlets can be summarized as follows: I stage — oxide — (wolframite, cassiterite, molybdenite, quartz, K-feldspar, beryl, fluorite, topaz), the best represented; II stage — sulphide — (chalcopyrite, galena, sphalerite, pyrite, pyrrhotite, bismuthinite, cassiterite, wolframite, quartz) well represented at Piaotang; III stage — carbonate — (pyrite, scheelite, chlorite, sericite, fluorite, quartz, calcite). The fracture-controlled mineralizations of Dayu appear to be the product of a continous multistage process related to the late phases of the jurassic Yenshanian magmatism.
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Tanelli, G. Geological setting, mineralogy and genesis of tungsten mineralization in Dayu district, JiangXi (People's Republic of China): An outline. Mineral. Deposita 17, 279–294 (1982). https://doi.org/10.1007/BF00206476
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DOI: https://doi.org/10.1007/BF00206476