安徽庐枞盆地何家小岭黄铁矿床特征和成因研究

PYRITE DEPOSITS OF THE HEJIA-XIAOLING MINE, LUJIANG-ZONGYANG BASIN, ANHUI PROVINCE: CHARACTERISTICS AND GENESIS

何家小岭黄铁矿床受控于砖桥组下段第一韵律层(J_3zh)的火山碎屑岩中,热液蚀变作用明显。矿床成因分四类:1、火山沉积型;2、次火山岩型;3、叠加改造型;4、火山热液型。硫主要来源于上地幔或深部地壳。矿床通过火山岩浆内生成矿和盆地环境外部因素综合作用形成。该黄铁矿床确定为典型中低温火山沉积—热液叠加改造型层控矿床。

The pyrite deposits in Hejia—Xiaoling mining area are controlled by the hydrothermal alteration of volcaniclastics of the first eruptive cycle (J_(AZHI)~1) of the Zhuanqiao Formation. There are four kinds of genetic deposits: 1) volcanic sedimentary; 2) subvolcanic rock; 3) superimposed transformation; and 4) volcanic hydrothermal solution types. Deposits are formed by the combined effects of volcanic magmatic endogenetic mineralization and later basinic diagenetic factors. Sulfur is principally derived initially from the upper mantle or the deep crust. The pyrite bodies occur as layer—bound deposits of typical middle—low temperature volcanic—sedimentary and hydrothermal superimposition types.