浙江岭后多金属矿床的海相火山热液沉积成矿特征和成矿模式

岭后矿床为大陆拗陷带中形成的块状硫化物矿床,产于中石炭统底部伴有少量火山岩、硅质岩和碧玉岩的白云岩中。整合块状矿体之下有一状矿化蚀变带,矿石具典型海底喷气沉积作用形成的结构构造和矿石相(带),矿床金属分带、黄铁矿的Co/Ni和S/Se比值。成矿温度以及硫。铅同位素特征表明,岭后矿床为海相火山热液沉积成因的。

GEOLOGIC CHARACTERISTICS AND METALLOGENETIC MODEL OF SUBMARINE VOLCANIC HYDROTHERMAL SEDIMENTARY MINERALIZATION OF THE POLYMETALLIC DEPOSIT IN LINGHOU, ZHEJIANG, CHINA

The Linghou deposit occurs at the bottom of the Middle Carboniferous carbonate rocks, and was previ-ously regarded as a typical post-magmatic hydrothermal product. However, the current detailed field andlaboratory investigations reveal that it is actually a massive sulfide deposit directly related to the LatePaleozoic submarine volcanism. The main orebodies are stratiform and lenticular, concordant with the occurrences of the host rocks.Beneath the main orebodies a pips-like alteration zone with sulfide veinlets was developed. The ores havetypical striped and load-flow structure as well as colloidal texture, which suggest a hydrothermal syngenet-i? sedimentary origin. A typical stratigraphical zonation is observed. Cu is concentrated in the lower part,While Pb and Zn in the upper part. The Co/Ni and S/Se ratios in pyrite as well as the sulfur and oxygenisotope data show that the origin of the deposit was associated with submarine volcanic exhalation andhydrothermal sedimentation.