福建福安上后洋叶蜡石矿床地质特征及找矿标志

Geologic Characteristics and Ore-finding Indicators of the Houyang Pyrophyllite Deposit in Fu'an, Fujian Province

福建福安上后洋叶蜡石矿呈似层状 ,赋存于晚侏罗世南园组中部火山碎屑岩中 ,共发现有 4个矿体。矿石可分为 2种类型 ,即石英叶蜡石型和伊利石质叶蜡石型 ,以石英叶蜡石型为主。矿体明显受地层岩性控制 ,属火山热液顺层交代蚀变的似层状叶蜡石矿床。

The Houyang pyrophyllite deposit in Fu'an, Fujian Province, with the stratoid structure, consists in volcaniclastic rocks of the middle part of the Late Jurassic Nanyuan Formation(J 3n) strata in which four orebodies have been discovered. The ores in the surveyed area can be divided into two kinds: quartz pyrophyllite and illitic pyrophyllite, mainly quartz pyrophyllite. The orebodies of the pyrophyllite deposit are obviously controlled by the stratum and lithology and it belongs to the stratoid pyrophyllite deposit of volcanic hydrothermal metasomatic alteration.