Longtoushan Gold Deposit of Subvolcanic-Cryptoexplosion Breccia Type, Guangxi
广西龙头山次火山-隐爆角砾岩型金矿床

The Longtoushan gold deposit is related to late Yanshanian subvolcanic rocks such as rhyolitic porphyry and breccia lava. According to the wall rocks and structural conditions the ore bodies may be divided into three types :subvolcanic-cryptoexplosion breccia type,contact zone-structural breccia type,and wall rock-structural breccia type.There is a close relationship between gold mineralization and tourmalinization and silicification. According to a study on the ore composition,distributive characteristics of gold and its associated elements,stable isotopes(S,Pb,H,O and C),geochemistry of fluid inclusions and physical-chemical conditions for mineralization,the authors conclud that the Longtoushan deposit is a pneumato-hypothermalgold deposit related to subvolcanic-cryptoexplosion breccia.