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新桥块状硫化物矿床发育双层结构,地球化学特征也呈现出明显的“二元性”和垂向变化。下部网脉状蚀变矿化岩石SiO2、Al2O3、K2O和Na2O等含量较高,上部层状块状矿石和含矿岩石Fe2O3、FeO、CaO、MgO及SiO2等明显富集。稀土含量相对较低,上部层状块状矿层平均值为10.73×10-6,下部通道相蚀变矿化岩石平均值为126.1×10-6。重晶石δ34S值为+16.2‰,硬石膏δ34S值为+11.2‰,黄铁矿δ34S值为+1.5‰～+4.7‰。含矿硅质岩δ18O为+12.0‰～+13.9‰,下部通道相含黄铁矿石英脉δ18O值为+13.3‰～+18.6‰。自下部网脉状矿化到上部层状块状矿层,从粗晶细晶到变胶状胶状黄铁矿,δ34S、δ18O和δ30Si值逐渐降低,206Pb/204Pb、207Pb/204Pb和208Pb/204Pb平均值逐渐增高。
The double-layer structure of Xinqiao massive sulfide deposit is developed, and its geochemical characteristics also show obvious “duality” and vertical variation. The contents of SiO2, Al2O3, K2O and Na2O in the lower network of vein altered mineralized rocks are relatively high, and the upper layered massive ore and ore-bearing rocks Fe2O3, FeO, CaO, MgO and SiO2 are obviously enriched. The content of rare earth is relatively low, the average value of the upper bedded massive ore is 10.73 × 10-6, and the average value of the lower channel altered mineralized rocks is 126.1 × 10-6. The δ34S value of barite is + 16.2 ‰, the δ34S value of anhydrite is + 11.2 ‰, and the δ34S value of pyrite is + 1.5 ‰ ~ + 4.7 ‰. The δ18O of the ore-bearing chert is from + 12.0 ‰ to + 13.9 ‰, while the δ18O value of the lower channel-phase-bearing pyrite is + 13.3 ‰ ~ + 18.6 ‰. The δ34S, δ18O and δ30Si values gradually decrease from coarse grain to fine gelatinous pyrite, from 206Mb / 204Pb, 207Pb / 204Pb and 208Pb / 204Pb Average gradually increased.