凤太泥盆纪拉分盆地中硅质铁白云岩—硅质岩特征及成岩成矿方式

从岩石学、矿物学、地球化学等叫结秦岭凤太地区泥盆纪硅质白云岩－硅质岩的地质地球化学特征。硅质岩类中，ＳｉＯ２〉８０％，（ＦｅＯ＋Ｆｅ２Ｏ３＋ＭｇＯ）〈１０％；硅质铁白云岩类中，ＳｉＯ２为３０％～５０％，（ＦｅＯ＋ＦｅＯ３＋ＭｇＯ）大于２０％，提出该类热水沉积岩热水同生沉积作用、热水温合同生沉积作用，热水同生沉积交代作用，热水爆炸－液压致裂作用及热水充填－交代作用形成。

The characteristics and diagenetic-metallogenic pattern for cherts and siliceous ferrodolomitites from Fengtai apart-pull basin, Qinling orogen.

Based on the studies of petrology, mineralogy, geochemistry for the cherts and siliceous ferrodolomitites from Fengtai apart pull basin, Qinling Orogen, geological and geochemical characteristics for the hydrothermal rocks have been discussed. Cherts with contents of (FeO Fe 2O 3 MgO) less than 10% contains SiO 2 more than 70% while siliceous ferrodolomitites with contents of (FeO Fe 2O 3 MgO) more than 20% contains SiO 2 from 30% to 50%. The results of research have shown that diagenetic metallogenic pattern of these hydrothermal rocks includes synsedimentation of the hydrothermal water, synsedimentation replacement of the hydrothermal water, synsedimentation of the hydrothermal water mixing, explosion and fluid pressure fracturing of the hydrothermal water, and filling replacement of the hydrothermal water.