铁山嶂铁矿床地质特征和有害元素分布规律

The Geological Features and the Distribution Pattern of the Harmful Elements in Tieshanzhang Iron Ore Deposit

铁矿体产于晚泥盆世佘田桥组的火山—碎屑岩系中．矿体层状，与围岩整合接触．矿石中有火山物质，微量元素和硫同位素特征表明成矿物质主要来自海底火山活动，矿床属海相火山沉积成因．铁矿石中有害元素Ｓｎ，Ｐｂ，Ｚｎ，Ａｓ超出允许范围。

The iron ore body is formed in the volcanic clastic rock series of Setian group in the late Devonian Period,moreover,it is lay shaped and in conformable contact with the host rocks.Volcanic material and the features of minor elements and sulfide isotopes in the ore show that the metallogenic material is derived mainly from submarine volcanic activities,and the ore deposit indicates its volcainc sedimentary genesis.On the other hand,the aboundance values of the harmful elements such as Sn,Pb,Zn and As in the ore deposit are beyond the allowed range,but they have a regular distribution pattern.