摘要
火山沉积成矿有两种类型,一是火山沉积类型,二是火山喷气沉积类型。火山沉积类型的非金属矿产成矿物质来源于成岩物质,即炽热的火山碎屑空落入火山湖盆水体中经水介脱玻及蚀变作用而成;而火山热液来源于炽热的火山碎屑进入水中后将热量传导给水体因而构成50～100℃上下的热水溶液,又反作用于火山碎屑物质,形成火山玻璃物质的水介脱玻及碎屑物质蚀变矿化而成矿,主要依据酸碱度不同,由酸性至碱性可由明矾石、高岭石、叶蜡石、伊利石(近于中性)而至碱性的蒙脱石型膨润土及沸石和珍珠岩等矿床,而由水盆边缘至中心一般可出现由粗碎屑的集块、角砾至角砾凝灰质直至凝灰质等结构的矿石,尤其是沸石,膨润土和明矾石等最为明显,据此构成了火山沉积成矿模式。
The main ore body （layer ore body）＇s mineralization period of non-metal deposits in continental volcanic sedimentary rock series should be volcanic sedimentary origin. It is heated volcanic pyroclastics （or lavas）, which fell into lake basin, then pass through hydrolysis ＆ devitrification and formed non-metal minerals. The ore sources came from volcanic pyroclastic or lava diagenetic materials, but the heatsource ＆ water-source are from heated volcanic materials to deliver lake water, then they are formed heated water about 50-100℃ even to evaporation. Diagenesis ＆ mineralization are the same period. From acid to alkali, they can be formed aiunite → kaolinite → pyrophyllite → illite → bentonite → zeolite ＆ pearlite. But lava is overflown into lake basin ＆ can be formed ryolite in spherulite, bail foam ＆ rock foam rhyolite ＆ pearlite
出处
《安徽地质》
2006年第2期88-93,共6页
Geology of Anhui
关键词
火山沉积岩系
非金属矿床
成矿机理
成矿模式
volcanic sedimentary rock series
non-metal deposits
mineralization machanism
deposit model
