The　Shuangqishan　gold　deposit　(＞20t　gold)　is　located　in　a　hitherto　poorly-documented　gold　province　in　the　southeastern　Cathaysia　Block,　South　China.　It　is　hosted　by　Neoproterozoic　amphibolite-facies　metamorphic　rocks　and　consists　of　quartz-sulfide　veins　with　distinct　alteration　haloes.　Three　stages　of　hydrothermal　activity　have　been　identified,　and　gold　is　mainly　associated　with　veins　of　Stage　II　(quartz-pyrite　+/-　chalcopyrite).　Gold　occurs　both　as　refractory　gold　hosted　by　pyrite　and　free　gold　enclosed　in,　or　filling,　microfractures　of　pyrite　and　quartz.　U-Pb　isotope　dating　of　hydrothermal　apatite　from　the　Substage　Ha　veins　yielded　an　age　of　436.8　+/-　7.6　Ma.　The　ore　fluid　was　of　carbonic-aqueous　composition　and　low　oxygen　fugadty.　Total　homogenization　temperatures　in　Substage　Ha　and　llb　range　from　270　degrees　to　310　degrees　C　and　250　degrees　to　295　degrees　C,　respectively.　Variable　CO2/H2O　ratios　indicate　fluid　unmixing　under　fluctuating　pressures.　Stage　I　quartz　veins　show　evidence　of　ductile　deformation　and　have　delta　O-1(8)fluid　and　delta　D　values　of　10.3　to　11.2　parts　per　thousand　and　-67to　-66　parts　per　thousand,　respectively,　consistent　with　a　metamorphic　fluid.　Stage　II　veins　have　slightly　higher　delta　O-18　values　of　10.9　to　13.7　parts　per　thousand,　with　calculated　delta　O-1(8)fluid　values　of　4.8　to　8.0　parts　per　thousand.　The　He-3/He-4　ratios　of　pyrite　are　elevated　(0.06-0.23　Ra)　relative　to　crustal　He　reservoirs　(＜0.01　Ra).　Fluid　inclusions　in　quartz　yielded　delta(13)C(CO2)values　of　-23.0to　-11.4　parts　per　thousand　(V-PDB),　reflecting　variable　con　tributions　of　organic　carbon.　The　sulfide　delta　S-34(V-CDT)　values　range　from　-4.7to　-1.0　parts　per　thousand,　consistent　with　a　deepseated　sulfur　source.　The　Pb　isotope　compositions　of　pyrite　(Pb-206/Pb-204=　17.141-17.871,　(207)Pbi/(204)pPb=15.484-15.570)　are　more　radiogenic　than　those　of　unaltered　host　rocks.　All　available　data　demonstrate　that　the　Shuangqishan　deposit　is　the　first　report　orogenic　gold　deposit　formed　during　the　late　Wuyi-Yunkai　intracontinental　orogeny　in　the　Cathaysia　Block.　(C)　2020　International　Association　for　Gondwana　Research.　Published　by　Elsevier　B.V.　All　rights　reserved.