论文部分内容阅读
西太平洋冲绳海槽烟囱式硫化物矿床分布于琉球弧后扩张盆地、产于尹是名洼陷盆地(深1400m),其特征与日本黑矿类似。硫化物矿石及烟囱主要有3种化学类型:Pb-Zn-Ba型、Zn-Pb型和Cu-Zn型,三者分别代表温度不断升高的热液体系的早、中、晚3个成矿阶段产物,其中,Pb-Zn-Ba矿石及烟囱形成于高fo2环境和高流速、低温、富Pb、Zn、Ba热液体系,Cu-Zn矿石及烟囱形成于低流速、高温、富Cu热液体系,Zn-Pb矿石则介于其间。硫化物烟囱显示明显的矿物-化学分带。在Pb-Zn-Ba矿石(烟囱),Zn、Cd集中于烟囱中央,Ba、Fe、As、Sb、Ag、Pb集中于烟囱外带,Cu则富集于烟囱中外部。在Cu-Zn矿石,As、Sb、Fe、Ag、Au仍富集于烟囱外带,Cu、Zn、Pb则在烟囱中央富集。依此元素化学分带型式,建立了古代黑矿硫化物矿体分带与硫化物堆积模式
The West Pacific Okinawa Trough Chimney Sulfide Deposits are distributed in the Ryukyu Arc Back Dilation Basin and are produced in the Yinshiya subsidence basin (1400 m deep), similar in character to the Japanese black mines. There are three chemical types of sulfide ores and chimneys: Pb-Zn-Ba, Zn-Pb and Cu-Zn, which represent the early, middle and late stages of the hydrothermal system with increasing temperature Pb-Zn-Ba ore and chimney formed in a high fo2 environment and high velocity, low temperature, Pb, Zn, Ba hydrothermal system, Cu-Zn ore and the chimney formed at low flow rate, high temperature, Cu Hydrothermal system, Zn-Pb ore is in between. Sulfide chimney shows obvious mineral-chemical zonation. In Pb-Zn-Ba ore (chimney), Zn and Cd are concentrated in the center of the chimney. Ba, Fe, As, Sb, Ag and Pb are concentrated outside the chimney, while Cu is enriched in the outside of the chimney. In Cu-Zn ore, As, Sb, Fe, Ag and Au are still enriched in the outskirts of the chimney. Cu, Zn and Pb are concentrated in the center of the chimney. Based on this elemental chemical zonation pattern, the zoning and sulfide accumulation pattern of the ancient ores